Dekalb, Illinois Weather Conditions

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Current Conditions

  • 60°
  • Overcast
  • Wind: SW 8 mph
  • Humidity: 70%
  • Visibility: 10.0 miles
  • Dew Point: 50°
  • Pressure: 30.21 in. 0

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Next 12 Hours

5  am
8  am
11  am
2  pm
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Rain
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Overcast
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Overcast
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Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Sunday
  • Chance of Rain
  • High: 71 °
  • Low: 63 °
  • Chance of Rain
  • Monday
  • Chance of Rain
  • High: 79 °
  • Low: 65 °
  • Chance of Rain
  • Tuesday
  • Thunderstorm
  • High: 72 °
  • Low: 58 °
  • T-Storms
  • Wednesday
  • Partly Cloudy
  • High: 77 °
  • Low: 56 °
  • Partly Cloudy
  • Thursday
  • Clear
  • High: 81 °
  • Low: 63 °
  • Clear

Forecast for Dekalb, Illinois

Updated: 4:05 AM CDT on January 24, 2015

  • Sunday

    Cloudy skies with showers and a possible thunderstorm this afternoon. High 71F. Winds ESE at 10 to 20 mph. Chance of rain 70%.

  • Sunday Night

    Thunderstorms early, then variable clouds overnight with still a chance of showers. Low 63F. Winds SSE at 15 to 25 mph. Chance of rain 90%.

  • Monday

    Windy with rain showers in the morning then partly cloudy in the afternoon. Thunder possible. High 79F. Winds SSW at 20 to 30 mph. Chance of rain 50%.

  • Monday Night

    Partly cloudy skies early. Scattered thunderstorms developing later at night. Low near 65F. Winds SSW at 10 to 20 mph. Chance of rain 50%.

  • Tuesday

    Thunderstorms. High 72F. Winds SSW at 15 to 25 mph. Chance of rain 80%.

  • Tuesday Night

    Partly cloudy. Low 58F. Winds SW at 10 to 20 mph.

  • Wednesday

    Partly cloudy. High 77F. Winds WNW at 10 to 15 mph.

  • Wednesday Night

    A mostly clear sky. Low 56F. Winds SW at 5 to 10 mph.

  • Thursday

    Sunshine and some clouds. High 81F. Winds SSE at 10 to 15 mph.

  • Thursday Night

    Scattered thunderstorms, especially in the evening. Low 63F. Winds S at 5 to 10 mph. Chance of rain 40%.

  • Friday

    Scattered thunderstorms developing during the afternoon. High 81F. Winds SSW at 10 to 20 mph. Chance of rain 50%.

  • Friday Night

    Scattered thunderstorms during the evening followed by occasional showers overnight. Low 56F. Winds SSW at 10 to 15 mph. Chance of rain 50%.

  • Saturday

    Showers early then scattered thunderstorms developing later in the day. High 64F. Winds E at 15 to 25 mph. Chance of rain 50%.

  • Saturday Night

    Showers in the evening, then cloudy overnight. Low 49F. Winds NE at 10 to 20 mph. Chance of rain 50%.

  • Sunday

    Intervals of clouds and sunshine. High 67F. Winds NE at 10 to 20 mph.

  • Sunday Night

    A few clouds from time to time. Low 47F. Winds NE at 10 to 15 mph.

  • Monday

    Mainly sunny. High 72F. Winds ENE at 10 to 15 mph.

  • Monday Night

    A mostly clear sky. Low near 50F. Winds ESE at 5 to 10 mph.

  • Tuesday

    Sunny. High 76F. Winds SE at 5 to 10 mph.

  • Tuesday Night

    Cloudy with a few showers. Low 58F. Winds SSE at 5 to 10 mph. Chance of rain 30%.

  • Wednesday

    A few clouds from time to time. High 79F. Winds S at 10 to 15 mph.

  • Wednesday Night

    Partly cloudy skies. Low near 60F. Winds S at 5 to 10 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: South DeKalb, DeKalb, IL

Updated: 5:55 AM CDT

Temperature: 60.4 °F Dew Point: 54 °F Humidity: 81% Wind: SE at 3.0 mph Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: Northern Illinois University - Davis Hall, DeKalb, IL

Updated: 5:55 AM CDT

Temperature: 61.5 °F Dew Point: 54 °F Humidity: 77% Wind: Calm Pressure: 30.12 in Hourly Precipitation: 0.00 in Graphs

Location: Northern Illinois University - Barsema Alumni and Visitors Center, DeKalb, IL

Updated: 5:55 AM CDT

Temperature: 61.6 °F Dew Point: 54 °F Humidity: 76% Wind: SW at 3.0 mph Pressure: 30.07 in Hourly Precipitation: 0.00 in Graphs

Location: Rob's Horsepower Haven, DeKalb, IL

Updated: 5:55 AM CDT

Temperature: 61.0 °F Dew Point: 54 °F Humidity: 78% Wind: SW at 1.0 mph Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: DeKalb, IL

Updated: 5:43 AM CDT

Temperature: 62.5 °F Dew Point: 53 °F Humidity: 72% Wind: South at 5.0 mph Pressure: 30.14 in Hourly Precipitation: - Graphs

Location: Sycamore, IL

Updated: 5:55 AM CDT

Temperature: 61.2 °F Dew Point: 53 °F Humidity: 74% Wind: SW at 2.0 mph Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: MesoWest, Malta, IL

Updated: 4:10 AM CDT

Temperature: 61 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: Heron Creek, Sycamore, IL

Updated: 5:55 AM CDT

Temperature: 62.4 °F Dew Point: 52 °F Humidity: 70% Wind: WSW at 4.0 mph Pressure: 30.18 in Hourly Precipitation: 0.00 in Graphs

Location: Out On the Farm, Clare, IL

Updated: 5:55 AM CDT

Temperature: 61.2 °F Dew Point: 55 °F Humidity: 80% Wind: SSW at 9.0 mph Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: Ellen Oaks Subdivision, Genoa, IL

Updated: 5:55 AM CDT

Temperature: 62.2 °F Dew Point: 52 °F Humidity: 69% Wind: South at 4.0 mph Pressure: 30.16 in Hourly Precipitation: 0.00 in Graphs

Location: Country Meadows, Kirkland, IL

Updated: 5:49 AM CDT

Temperature: 62.8 °F Dew Point: 51 °F Humidity: 66% Wind: SSW at 2.0 mph Pressure: 30.11 in Hourly Precipitation: 0.00 in Graphs

Location: Burlington Prairie Forest Preserve, Sycamore, IL

Updated: 5:52 AM CDT

Temperature: 62.1 °F Dew Point: 53 °F Humidity: 72% Wind: SSW at 2.7 mph Pressure: 30.01 in Hourly Precipitation: - Graphs

Location: South Sycamore Street, Hinckley, IL

Updated: 5:45 AM CDT

Temperature: 61.7 °F Dew Point: 52 °F Humidity: 70% Wind: North at - Pressure: 30.04 in Hourly Precipitation: - Graphs

Location: Genoa Road, Genoa, IL

Updated: 5:45 AM CDT

Temperature: 61.2 °F Dew Point: 52 °F Humidity: 73% Wind: Calm Pressure: 30.16 in Hourly Precipitation: 0.00 in Graphs

Location: APRSWXNET, Elburn, IL

Updated: 5:29 AM CDT

Temperature: 62 °F Dew Point: 52 °F Humidity: 71% Wind: SSW at 1 mph Pressure: 30.17 in Hourly Precipitation: 0.00 in Graphs

Location: Columbine, Elburn, IL

Updated: 5:52 AM CDT

Temperature: 61.0 °F Dew Point: 54 °F Humidity: 78% Wind: SSW at 4.0 mph Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: Columbine Square, Elburn, IL

Updated: 5:45 AM CDT

Temperature: 61.8 °F Dew Point: 53 °F Humidity: 74% Wind: SW at 2.0 mph Pressure: 30.12 in Hourly Precipitation: 0.00 in Graphs

Location: Prairie Valley North, Elburn, IL

Updated: 5:55 AM CDT

Temperature: 61.0 °F Dew Point: 54 °F Humidity: 77% Wind: West at 2.2 mph Pressure: 30.28 in Hourly Precipitation: 0.00 in Graphs

Location: Prairie Highlands, Elburn, IL

Updated: 5:55 AM CDT

Temperature: 62.3 °F Dew Point: 55 °F Humidity: 76% Wind: SSW at 1.0 mph Pressure: 30.16 in Hourly Precipitation: 0.00 in Graphs

Location: Griffith Avenue, Elburn, IL

Updated: 5:45 AM CDT

Temperature: 62.4 °F Dew Point: 52 °F Humidity: 67% Wind: North at - Pressure: 29.41 in Hourly Precipitation: - Graphs

Location: Hampshire, IL, Hampshire, IL

Updated: 5:55 AM CDT

Temperature: 61.9 °F Dew Point: 51 °F Humidity: 67% Wind: SSW at 4.0 mph Pressure: 30.18 in Hourly Precipitation: 0.00 in Graphs

Location: K9GPC, Rochelle, IL

Updated: 5:55 AM CDT

Temperature: 61.0 °F Dew Point: 54 °F Humidity: 77% Wind: SW at 3.8 mph Pressure: 30.13 in Hourly Precipitation: 0.00 in Graphs

Location: CamptonHillsWeather.com Central Kane County, St Charles, IL

Updated: 5:55 AM CDT

Temperature: 59.9 °F Dew Point: 53 °F Humidity: 78% Wind: NNW at 1.0 mph Pressure: 30.18 in Hourly Precipitation: 0.00 in Graphs

Location: OakGrove, Hampshire, IL

Updated: 5:54 AM CDT

Temperature: 62.2 °F Dew Point: 52 °F Humidity: 70% Wind: South at 2.7 mph Pressure: 30.07 in Hourly Precipitation: - Graphs

Location: Geneva, IL

Updated: 5:55 AM CDT

Temperature: 62.2 °F Dew Point: 53 °F Humidity: 72% Wind: SW at 5.0 mph Pressure: 30.11 in Hourly Precipitation: 0.00 in Graphs

Location: APRSWXNET, Wasco, IL

Updated: 5:35 AM CDT

Temperature: 56 °F Dew Point: 50 °F Humidity: 81% Wind: Calm Pressure: 30.15 in Hourly Precipitation: 0.00 in Graphs

Location: Windswept Acres, Marengo, IL

Updated: 5:55 AM CDT

Temperature: 63.2 °F Dew Point: 52 °F Humidity: 68% Wind: South at 4.0 mph Pressure: 30.13 in Hourly Precipitation: 0.00 in Graphs

Location: Saint Charles Burr Road, Saint Charles, IL

Updated: 5:45 AM CDT

Temperature: 60.6 °F Dew Point: 52 °F Humidity: 74% Wind: SSW at 4.7 mph Pressure: 29.91 in Hourly Precipitation: - Graphs

Location: Mill Creek, Geneva, IL

Updated: 5:55 AM CDT

Temperature: 60.2 °F Dew Point: 53 °F Humidity: 76% Wind: Calm Pressure: 30.13 in Hourly Precipitation: 0.00 in Graphs

Location: Mill Creek (NE), Geneva, IL

Updated: 5:55 AM CDT

Temperature: 61.3 °F Dew Point: 54 °F Humidity: 76% Wind: Calm Pressure: 30.19 in Hourly Precipitation: 0.00 in Graphs

Location: MesoWest, Geneva, IL

Updated: 5:15 AM CDT

Temperature: 56 °F Dew Point: - Humidity: - Wind: East at 3 mph Pressure: - Hourly Precipitation: 0.00 in Graphs

Location: WB9NJJ, Rochelle, IL

Updated: 5:55 AM CDT

Temperature: 59.7 °F Dew Point: 52 °F Humidity: 77% Wind: ENE at 1.3 mph Pressure: 29.41 in Hourly Precipitation: 0.00 in Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Chicago/Romeoville Illinois 
356 am CDT sun may 24 2015 


Short term... 
310 am CDT 


Sunday and Sunday night... 


Main issues for the short term forecast period will be ramping up 
precipitation chances as well as high temperatures for today...especially along the 
Illinois Lake Michigan shore. A large area of high pressure 
continues to slowly slide off the middle Atlantic coast with a ridge 
axis extending back through the upper Mississippi Valley. 
Meanwhile...Lee cyclogenesis slowly persists over eastern co/nm. A 
return flow of moisture is setting up over the central Continental U.S. In 
generally southeasterly-southerly around the western periphery of the departing high. 
Also...a weak warm front/trough appears to be seeing up across the 
Ohio Valley west through southern MO. Winds to the north of the boundary 
are prevailing southeasterly with prevailing southerly winds to the south. The southeasterly 
winds will continue to keep the Illinois shore of Lake Michigan a bit 
cooler than inland locations. However...the boundary is expected to 
move north through the day...putting the entire region under southerly 
flow eventually. The main impact will be on temperatures. With 
little change to the overall pattern...another warm day is expected 
for today...though more extensive cloud cover could keep maximum temperatures 
lower by a degree or 2. Do not expect a lake breeze to 
form...especially with strengthening winds of 10-15 miles per hour...but rather 
with synoptically southeast flow persisting into the early 
afternoon...the Illinois shore should be cooler than well 
inland...but as winds turn southerly by early afternoon over the Cook 
County shore...temperatures should rebound into the low 70s. Lake County 
Illinois will remain under the cooler southeasterly flow a bit longer...keeping the 
waukeegan area cooler through the day...with highs only in the lower 
60s. Locations well inland should see maximum temperatures today rising into 
the middle to upper 70s...with the Pontiac metropolitan area hitting close 
to 80f. 


Precipitation chances for today will be a bit tricky. A wave of scattered showers 
is moving northward through western Illinois...associated with a weak shortwave 
tracking up the western side of the upper ridge which is oriented from 
the southeastern Continental U.S. Through the upper Mississippi Valley. There is a 
chance for some of these showers to bring some light rain to the 
northwestern portions of the County Warning Area...along and west of the I-39 
corridor...including the Rockford area. Otherwise...the greater 
precipitation chances will have to wait for a much stronger shortwave 
expected to lift out of the south High Plains later this morning. 
This wave will track north-northeasterly to the upper Missouri Valley by early 
this evening and then as the upper ridge is forces eastward...will then 
turn more northeasterly...reaching the middle Mississippi Valley late 
tonight. The model guidance indicates a few strong low level jet of 
50-55kt directed into northern Illinois late tonight as well. The strong low 
level jet will help pump up deep layer moisture over the region with 
precipitable waters  climbing to around 1.8 inches this evening. The tricker parts 
to the weather/pop forecast has been where to focus the categorical probability of precipitation 
and how far east to spread the higher probability of precipitation and how much thunder to 
indicate withing the weather. Have largely confined the categorical probability of precipitation 
to the vicinity of the upper shortwave...over northwestern Illinois...including the 
Rockford area...but have dropped off probability of precipitation to the southeast...away 
from the strongest upper forcing. While current thinking is that 
much of the County Warning Area should see some measurable precipitation at some point...it 
is most likely that the eastern portions of the County Warning Area...including the 
Chicago metropolitan area and northwestern Indiana will likely not see the precipitation 
until late tonight or early tomorrow morning. The other concern is 
the thunder chances. Feel that the greater chances will also be 
closer to the upper forcing...over the western portions of the County Warning Area...but 
there is a chance that the eastern portions of the County Warning Area could see some 
isolated-scattered ts as well late tonight. Currently...the greatest 
sensible weather threat from this system will be locally heavy 
rainfall due to the anomalously high precipitable waters . Per the dvn precipitable water 
climatology for middle to late may...the expected 1.75 inch precipitable water 
forecast is near the 99th percentile. So...some of the stronger 
rain showers/thunderstorms and rain that develop will have the potential to produce locally 
heavy rainfall. 


Krein 


&& 


Long term... 
229 am CDT 


Monday through Saturday... 


For Memorial Day...largest concern for the day will be on precipitation 
timing/coverage. Guidance has been relatively consistent that a 
lobe of vorticity will be lifting north across the middle-Missouri 
Valley early Monday...with a surface wave prognosticated to be over central Iowa 
by daybreak Monday. The Channel of nearly 2.00 inches of precipitable water and 
anomalously strong 850mb v-wind or moisture transport...will be 
steadily shifting east/northeast across the forecast area shortly 
after daybreak. By middle-morning the moist plume will be departing the 
western County warning forecast area and by midday or shortly before...the remainder of 
the forecast area could be dry. In addition to the precipitation ending 
by midday...cloud cover should quickly erode with only a few 
clouds lingering in the afternoon hours. Unfortunately the trade 
off for a dry Holiday afternoon will be the breezy conditions. 
Mixing will be maximized given the lack of cloud cover...so expect 
gusts to near 35 miles per hour and possibly flirt with 40mph for a few 
hours. Have also nudged temperatures up a degree...with generally 80 to 
84 degree expected. 


The warm/moist air will continue to advect across the region Monday night 
into Tuesday...with yet another very mild overnight. Have temperatures mainly 
in the middle 60s but could see this not being warm enough. The 
wildcard will be cloud cover...which is clouds hold off 
longer...temperatures could still dip into the low/middle 60s. The dew points 
holding in the 60s would likely slow the rate of fall overnight. 


Tuesday through Saturday... 500mb trough axis will remain in a 
slightly negative orientation across the central Continental U.S....with a weak 
surface feature lifting north across the middle-Missouri Valley Tuesday 
morning. Broad middle-level ridging will remain over the southeast 
Continental U.S....meanwhile high-amplitude ridging continues across western 
Canada/Alaska. This will maintain a relatively active southwest flow 
pattern for the central Continental U.S./Great Lakes region through thur/Fri. 


Later in the week ensembles begin to nudge a 500mb vorticity south from 
central Canada with a surface feature prognosticated to develop along the Lee- 
side or the northern plains. Closer to Fri/Sat...oper solutions 
develop this surface feature with a frontal boundary sliding south from 
Canada. Confidence remains low on how things will evolve later in 
the week...although ensembles are demonstrating minimal spread that 
the upstream ridge will begin to flatten with a semi-zonal 
orientation developing. 


Will continue to carry periodic chances for showers/storms...and 
temperatures generally seasonal to slightly above seasonal through the bulk 
of the extended. 


Beachler 


&& 


Aviation... 


//Ord and mdw concerns...updated 09z... 


* winds becoming southeast to 10 kt+ by late morning...with gusts 
up to 20kt through the afternoon and evening. 


* Slight chance of -shra in the morning...with increasing chances 
for rain showers with possible thunderstorms and rain late evening through the night. 


Krein 


//discussion...updated 06z... 


A weak warm front lifting through the region will bring a chance 
for some scattered rain showers through the late night and morning hours. 
However...at this time...it appears activity should be too sparse 
to include in the tafs right now. While the warm front remains to 
the south of the terminals...winds should become southeasterly overnight 
and then veer to southerly to south-southwesterly as the warm front pushes to the 
north into Wisconsin. Also...by early evening as the warm front 
pushes to the north...low level moisture will be on the increase 
as a strengthening low level jet transports copious amounts of 
mosture into the region. The one factor lowering confidence in ts 
coverage in vicinity of the terminals is that the main upper level forcing 
will still be to the west in the evening...so...will will only go 
with thunderstorms in the vicinity and prob30 ts mentions at this time. 


Confidence is higher with the wind forecast. As the warm front 
pushes to the north of the terminals and winds become southerly...winds 
speeds will also increase as the surface pressure gradient strengthens 
and some mixing of the strong low level jet brings gustier winds 
at the surface. Will carry gusts to 20kt through the evening...but it 
is possible that gusts could be closer to 25 knots or slightly higher 
tomorrow night. 


Krein 


//Ord and mdw confidence...updated 09z... 


* medium confidence wind direction trends. 


* Medium to high confidence in wind speed trends. 


* Medium confidence in rain showers/thunderstorms and rain trends. 


* High confidence in all other forecast elements. 


Krein 


//outlook for Ord/mdw for 12z Monday-12z Saturday...updated 00z... 


Monday...thunderstorms and rain and MVFR likely in the morning. IFR possible. Gusty 
southwest winds. 
Tuesday... thunderstorms and rain likely. Gusty southwest winds. 
Wednesday...chance of thunderstorms and rain. West winds turning east. 
Thursday...slight chance of thunderstorms and rain. East winds. 
Friday...chance of thunderstorms and rain. West winds. 


Mtf 


&& 


Marine... 
244 am CDT 


Warm/moist air will be steadily lifting north over the 
lake later today and continue through early next week. This will 
likely allow areas of fog to develop...and could become dense at 
times. 


The gradient quickly increases late tonight from the 
southwest/south...with gusts nearing 25-30kt for the nearshore 
waters of Illinois/in through Monday night. As a result have hoisted a Small 
Craft Advisory for Monday/Monday night. With guidance trending up on 
gusts...it is possible we may see a gale force gusts or two occur 
Monday afternoon in the Illinois/in nearshore waters. Then another wave will 
lift north Tuesday and could bring gusty winds yet again to the 
nearshore waters. Expect the gusts not to push out far over the open 
waters as the water remains much colder...which will likely allow a 
stable marine layer to develop and limit how much mixing can occur 
from the winds aloft to the surface. In addition this will likely limit 
how large the waters will build. 


Beachler 


&& 


Lot watches/warnings/advisories... 
Illinois...none. 
In...none. 
Lm...Small Craft Advisory...lmz740-lmz741-lmz742-lmz743-lmz744- 
lmz745...4 am Monday to 4 am Tuesday. 


&& 


$$ 


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