Dekalb, Illinois Weather Conditions

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Current Conditions

  • 36°
  • Clear
  • Wind: Calm
  • Humidity: 33%
  • Visibility: 10.0 miles
  • Dew Point: 10°
  • Pressure: 30.27 in. -

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Next 12 Hours

5  pm
8  pm
11  pm
2  am
5  am
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Partly Cloudy
Partly Cloudy
35°
29°
24°
24°
26°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Sunday
  • Chance of Rain
  • High: 45 °
  • Low: 30 °
  • Chance of Rain
  • Monday
  • Clear
  • High: 55 °
  • Low: 39 °
  • Clear
  • Tuesday
  • Clear
  • High: 55 °
  • Low: 34 °
  • Clear
  • Wednesday
  • Clear
  • High: 60 °
  • Low: 49 °
  • Clear
  • Thursday
  • Chance of Rain
  • High: 61 °
  • Low: 44 °
  • Chance of Rain

Forecast for Dekalb, Illinois

Updated: 1:16 PM CDT on January 28, 2015

  • Saturday

    Plentiful sunshine. Temps nearly steady in the mid 30s. Winds light and variable.

  • Saturday Night

    Clear to partly cloudy. Low 23F. Winds SSE at 10 to 20 mph.

  • Sunday

    Areas of freezing rain possible early. Rain showers early, then remaining overcast and windy later in the day. High near 45F. Winds SSW at 25 to 35 mph. Chance of rain 60%.

  • Sunday Night

    Partly cloudy. Windy early. Low near 30F. WNW winds at 20 to 30 mph, decreasing to 10 to 15 mph.

  • Monday

    Generally sunny despite a few afternoon clouds. High near 55F. Winds WNW at 10 to 20 mph.

  • Monday Night

    A few clouds from time to time. Low 39F. Winds SW at 10 to 20 mph.

  • Tuesday

    Except for a few afternoon clouds, mainly sunny. High around 55F. Winds NW at 15 to 25 mph.

  • Tuesday Night

    A mostly clear sky. Low 34F. Winds ESE at 5 to 10 mph.

  • Wednesday

    Sunny. High near 60F. Winds SSE at 10 to 20 mph.

  • Wednesday Night

    Partly cloudy. Low 49F. Winds SSW at 10 to 20 mph.

  • Thursday

    Showers in the morning with some clearing in the afternoon. High 61F. Winds WSW at 10 to 20 mph. Chance of rain 60%.

  • Thursday Night

    Showers in the evening, then cloudy overnight. Low 44F. Winds E at 10 to 15 mph. Chance of rain 50%.

  • Friday

    Rain likely. High 48F. Winds NE at 10 to 20 mph. Chance of rain 80%. Rainfall around a half an inch.

  • Friday Night

    Rain showers early mixing with snow showers late. Low 31F. Winds NNW at 10 to 20 mph. Chance of precip 70%.

  • Saturday

    Snow showers early. Peeks of sunshine later. High 48F. Winds W at 10 to 20 mph. Chance of snow 40%.

  • Saturday Night

    A mostly clear sky. Low 29F. Winds SSW at 5 to 10 mph.

  • Sunday

    Partly cloudy. High 49F. Winds SSE at 10 to 15 mph.

  • Sunday Night

    Cloudy skies early, then partly cloudy after midnight. Low 34F. Winds SSE at 5 to 10 mph.

  • Monday

    Partly cloudy skies in the morning will give way to cloudy skies during the afternoon. High 54F. Winds SSE at 10 to 20 mph.

  • Monday Night

    Thunderstorms in the evening, then variable clouds overnight with still a chance of showers. Low 41F. Winds SSE at 10 to 15 mph. Chance of rain 80%.

  • Tuesday

    Rain showers early with some sunshine later in the day. High around 55F. Winds SSW at 10 to 15 mph. Chance of rain 50%.

  • Tuesday Night

    A few clouds. Low 38F. Winds WSW at 5 to 10 mph.

Severe Weather Alert Descriptions

 Special Statement  Statement as of 3:27 PM CDT on March 28, 2015


Moderately strong winds are expected to develop shortly after
daybreak Sunday and last through mid to late afternoon before
tapering. Sustained southwest winds of 20 to 30 mph with gusts to
40 mph are expected. Winds of this magnitude can make driving
difficult... especially for high profile vehicles. Be sure to
secure any loose items left outside.


Bmd


Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: South DeKalb, DeKalb, IL

Updated: 5:08 PM CDT

Temperature: 39.5 °F Dew Point: 18 °F Humidity: 42% Wind: SE at 4.0 mph Pressure: 30.30 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: Northern Illinois University, DeKalb, IL

Updated: 5:09 PM CDT

Temperature: 39.5 °F Dew Point: 15 °F Humidity: 37% Wind: Calm Pressure: 30.22 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Rob's Horsepower Haven, DeKalb, IL

Updated: 5:04 PM CDT

Temperature: 40.8 °F Dew Point: 15 °F Humidity: 35% Wind: WSW at 2.0 mph Pressure: 30.31 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: DeKalb, IL

Updated: 4:59 PM CDT

Temperature: 41.6 °F Dew Point: 18 °F Humidity: 38% Wind: SSE at 5.0 mph Pressure: 30.29 in Hourly Precipitation: - Windchill: 38 °F Graphs

Location: Sycamore, IL

Updated: 5:09 PM CDT

Temperature: 37.8 °F Dew Point: 14 °F Humidity: 38% Wind: WSW at 4.0 mph Pressure: 30.26 in Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: Heron Creek, Sycamore, IL

Updated: 5:09 PM CDT

Temperature: 40.1 °F Dew Point: 12 °F Humidity: 31% Wind: Calm Pressure: 30.26 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Out On the Farm, Clare, IL

Updated: 5:05 PM CDT

Temperature: 40.0 °F Dew Point: 17 °F Humidity: 40% Wind: SSE at 4.0 mph Pressure: 30.31 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: Ellen Oaks Subdivision, Genoa, IL

Updated: 5:09 PM CDT

Temperature: 38.8 °F Dew Point: 15 °F Humidity: 38% Wind: SW at 1.0 mph Pressure: 30.32 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Country Meadows, Kirkland, IL

Updated: 5:08 PM CDT

Temperature: 39.3 °F Dew Point: 14 °F Humidity: 36% Wind: WNW at 2.0 mph Pressure: 30.27 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Burlington Prairie Forest Preserve, Sycamore, IL

Updated: 5:03 PM CDT

Temperature: 40.8 °F Dew Point: 16 °F Humidity: 36% Wind: SW at 2.7 mph Pressure: 30.01 in Hourly Precipitation: - Windchill: 41 °F Graphs

Location: South Sycamore Street, Hinckley, IL

Updated: 5:05 PM CDT

Temperature: 40.8 °F Dew Point: 17 °F Humidity: 38% Wind: North at - Pressure: 30.11 in Hourly Precipitation: - Windchill: 41 °F Graphs

Location: Genoa Road, Genoa, IL

Updated: 4:57 PM CDT

Temperature: 39.4 °F Dew Point: 17 °F Humidity: 41% Wind: South at 2.0 mph Pressure: 30.32 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Columbine, Elburn, IL

Updated: 4:55 PM CDT

Temperature: 43.9 °F Dew Point: 14 °F Humidity: 30% Wind: West at 1.0 mph Pressure: 30.29 in Hourly Precipitation: 0.00 in Windchill: 44 °F Graphs

Location: Columbine Square, Elburn, IL

Updated: 5:09 PM CDT

Temperature: 40.8 °F Dew Point: 14 °F Humidity: 34% Wind: Calm Pressure: 30.27 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Prairie Valley North, Elburn, IL

Updated: 5:09 PM CDT

Temperature: 41.2 °F Dew Point: 11 °F Humidity: 29% Wind: SSW at 4.2 mph Pressure: 30.35 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Prairie Highlands, Elburn, IL

Updated: 5:05 PM CDT

Temperature: 42.1 °F Dew Point: 15 °F Humidity: 33% Wind: Calm Pressure: 30.31 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Hampshire, IL, Hampshire, IL

Updated: 5:09 PM CDT

Temperature: 38.4 °F Dew Point: 16 °F Humidity: 39% Wind: SW at 2.0 mph Pressure: 30.34 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: K9GPC, Rochelle, IL

Updated: 5:09 PM CDT

Temperature: 49.5 °F Dew Point: -3 °F Humidity: 11% Wind: Calm Pressure: 29.47 in Hourly Precipitation: 0.00 in Windchill: 50 °F Graphs

Location: APRSWXNET St. Charles IL US, Wasco, IL

Updated: 4:29 PM CDT

Temperature: 40 °F Dew Point: 13 °F Humidity: 32% Wind: NNW at 2 mph Pressure: 30.33 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Campton Hills, Campton Hills, IL

Updated: 5:08 PM CDT

Temperature: 43.2 °F Dew Point: 8 °F Humidity: 23% Wind: Calm Pressure: 30.33 in Hourly Precipitation: 0.00 in Windchill: 43 °F Graphs

Location: Windswept Acres, Marengo, IL

Updated: 5:05 PM CDT

Temperature: 41.0 °F Dew Point: 18 °F Humidity: 40% Wind: West at 3.0 mph Pressure: 30.29 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Saint Charles Burr Road, Saint Charles, IL

Updated: 5:06 PM CDT

Temperature: 39.2 °F Dew Point: 8 °F Humidity: 27% Wind: ESE at 2.2 mph Pressure: 30.01 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: Mill Creek, Geneva, IL

Updated: 5:00 PM CDT

Temperature: 39.2 °F Dew Point: 9 °F Humidity: 29% Wind: Calm Pressure: 30.27 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Alexander Drive, Geneva, IL

Updated: 5:05 PM CDT

Temperature: 35.6 °F Dew Point: 25 °F Humidity: 65% Wind: North at - Pressure: 29.44 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Mill Creek (NE), Geneva, IL

Updated: 5:08 PM CDT

Temperature: 40.8 °F Dew Point: 11 °F Humidity: 29% Wind: Calm Pressure: 30.35 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: 3 Lakes, Saint Charles, IL

Updated: 5:04 PM CDT

Temperature: 44.6 °F Dew Point: 10 °F Humidity: 24% Wind: North at 1.1 mph Pressure: 30.02 in Hourly Precipitation: - Windchill: 45 °F Graphs

Location: Crego Place, Geneva, IL

Updated: 5:06 PM CDT

Temperature: 50.7 °F Dew Point: 19 °F Humidity: 28% Wind: North at - Pressure: 30.13 in Hourly Precipitation: - Windchill: - Graphs

Location: WB9NJJ, Rochelle, IL

Updated: 5:09 PM CDT

Temperature: 45.3 °F Dew Point: -8 °F Humidity: 10% Wind: SE at 2.2 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Windchill: 45 °F Graphs

Location: Thornwood, South Elgin, IL

Updated: 4:56 PM CDT

Temperature: 42.3 °F Dew Point: 13 °F Humidity: 30% Wind: NNE at 1.1 mph Pressure: 30.18 in Hourly Precipitation: - Windchill: 42 °F Graphs

Location: Providence Subdivision, Elgin, IL

Updated: 5:03 PM CDT

Temperature: 45.3 °F Dew Point: 15 °F Humidity: 29% Wind: Calm Pressure: 30.03 in Hourly Precipitation: - Windchill: 45 °F Graphs

Location: Waterford Oaks, North Aurora, IL

Updated: 5:09 PM CDT

Temperature: 42.0 °F Dew Point: 12 °F Humidity: 29% Wind: WSW at 5.0 mph Pressure: 30.30 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: West Batavia, Batavia, IL

Updated: 4:56 PM CDT

Temperature: 38.8 °F Dew Point: 13 °F Humidity: 35% Wind: SE at 2.0 mph Pressure: 30.29 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: APRSWXNET Huntley IL US, Huntley, IL

Updated: 4:33 PM CDT

Temperature: 41 °F Dew Point: 14 °F Humidity: 33% Wind: SSW at 3 mph Pressure: 30.26 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Chicago/Romeoville Illinois 
457 PM CDT Sat Mar 28 2015 


Short term... 
242 PM CDT 


Through Monday... 


Rest of today and tonight broad midlevel height rises/subsidence 
will continue to provide quiet weather conditions although 
unseasonably cold conditions persist at the surface with a deep 
upper level trough centered over the eastern Great Lakes driving 
cold air as far as the deep south. On the back edge of the this 
system...potent vorticity maximum will drop into the northern plains this 
evening and tonight with attendant surface cold front pushing into 
northern Illinois late Sunday afternoon. Out ahead of the 
front...strong low level jet around 50-60 knots will transport a narrow 
corridor of 0.8 inch precipitable waters  and a warm nose with layer maximum temperatures of 
2-5c which will result in primarily rain for this system. The 
main concern for any mixed/wintry precipitation will be confined to the 
first couple hours at onset of precipitation where antecedent dry air may 
result in diabatic cooling of the column which will allow for 
sleet/freezing rain and possibly a few flakes. Warming of the 
column should be fairly rapid though which will help mitigate any 
brief impacts from wintry p-type. Very modest upright instability 
rooted between 600-700mb will move across the region midday and 
could result in a few briefly heavier showers. Precipitation will 
move into the western portion of the forecast area by middle morning 
and exiting east by late afternoon. Behind the front...expect most 
precipitation to end...however as the main upper wave moves overhead and 
cold advection results in steep low level lapse rates and shallow 
saturation mainly below 850 mb...cannot rule out a few sprinkles. 


Also of concern Sunday will be the magnitude of winds. A tight 
pressure gradient coupled with a ribbon of 6-7mb/3hr pressure falls 
will result in windy conditions across the region. Both NAM and GFS 
soundings show the potential for at least 30-40 miles per hour wind gusts and 
possibly a few isolated gusts to 45 miles per hour. A little uncertain about 
low level lapse rates and the efficiency of mixing with the expected 
cloud cover and warming middle-levels so will hold off a Wind Advisory 
for the time being...but will go ahead and issue an Special Weather Statement to highlight 
the concern. 


High pressure builds back over the middle Mississippi Valley Sunday 
night with winds diminishing and a return to dry conditions. Ridge 
axis shifts east across the forecast area during the day Monday. 
Temperatures should be near normal with morning lows in the low to 
middle 30s and afternoon highs in the low to middle 50s. 


Deubelbeiss 


&& 


Long term... 
242 PM CDT 


Monday night through Saturday... 


A clipper system will dig across the upper Midwest and western 
Great Lakes Monday night. The GFS and European model (ecmwf) have come in much 
better agreement on surface low track from 24 hours ago with the 
GFS shifting south more in line with the European. The NAM is a 
northern outlier. With the expected surface track...most likely 
expect to see precipitation stay north of the forecast area Monday 
night...and anything forming along the cold front during the day 
Monday should develop to our south/southeast. We do get a brief 
reinforcing shot of colder air that will slow our warning 
trend...but 60s still appear favorable for especially Wednesday 
and possibly Thursday depending on frontal passage timing. Broad upper level 
ridge will build across the middle section of the country Wednesday 
while low pressure moves east across the Canadian prairies. 850mb 
temperatures are prognosticated to warm to around 10c which should translate to 
surface temperatures in the 60s...and if anything feel forecast temperatures 
for Wednesday may be too low at the moment. A cold front is 
prognosticated to push across the region Thursday though there are 
significant timing differences between the models which would 
impact temperatures. Another cooldown looks possible late in the week 
into next weekend with both the GFS and European model (ecmwf) tracking a deep low 
across the Ohio Valley pulling colder air into the upper Midwest 
and bringing another chance of snow to northern Illinois. 


Deubelbeiss 


&& 


Aviation... 


//Ord and mdw concerns...updated 22z... 


* lake breeze influenced easterly winds into early evening 
* precipitation developing middle-morning Sunday...could include a 
mix of sleet/snow for 1-2 hours at onset before changing to all 
rain with temperatures above freezing 
* very gusty southwest winds Sunday...sustained 20 knots with gusts 
over 30 knots 


Ratzer/izzi 


//discussion...updated 18z... 


Surface high pressure moving across the terminals today...with 
weak gradient and light winds allowing lake breeze to develop and 
push inland with east-northeast wind near 10 knots eventually 
becoming light southeast this evening. May briefly see winds 10kt+ 
but should be sporadic/short lived. 


Low pressure will move across southern Canada tonight and 
Sunday...allowing winds to become south and increase especially 
toward morning. Just prior to sunrise winds in the 1000-1500 feet 
layer increase to 40+ kts...though gusty surface winds also 
develop which should result more in a mechanical turbulence 
scenario rather than a sharp low level wind shear layer. Southwest winds will 
increase during the morning...with gusts reaching/topping 30 kts 
by late morning and continuing into the afternoon. 


Precipitation is expected to develop from the west Sunday 
morning...as moisture lifts north toward the Canadian low. Column 
looks to initially be cool enough...at least through evaporative 
cooling...to support a mix of snow/sleet during the onset of 
precipitation before changing to all rain as warm advection 
overwhelms column and saturation occurs. Surface temperatures 
will be rising into the middle-upper 30s during the morning and 
around 40 by early afternoon. 


Ratzer 


//Ord and mdw confidence...updated 22z... 


* high in lake breeze wind trends this afternoon. 
* High in precipitation developing by middle-late morning Sunday. Low 
in precipitation type at onset. 
* High in strong gusty SW winds Sunday. Low in true low level wind shear Sunday 
morning. 


Ratzer/izzi 


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


Sunday night...mainly VFR. West winds. 
Monday...chance of rain and MVFR at night. Southwest winds. 
Tuesday...VFR northeast winds. 
Wednesday...chance for rain showers at night. 
Thursday-Friday...chance of rain. West winds. 


Mtf 


&& 


Marine... 
149 PM CDT 


High pressure over the lake has been helping for quiet conditions 
with light winds...but expect this to change tonight and 
especially Sunday morning as this high shifts to the east and a 
trough of low pressure approaches from the west. Lighter southerly 
winds this evening will increase rapidly over the entire lake 
overnight with south/southwest gales to 45 knots still expected. 
However southerly flow is appearing to likely approach storm force 
winds for a period Sunday morning through early Sunday afternoon. 
With a high likelihood of this occurrence...have maintained the 
current Gale Warning in effect for the entire lake but transition 
the northern half to a Storm Warning by 14z and continue it 
through 20z. Gales may linger a couple of hours beyond this end 
time but should be diminishing as well. Gale Warning for the south 
half remains the some...but with some possibility that the gales 
could continue a couple of hours beyond the end time tomorrow 
evening. 


Made some minor changes to the current headlines for the 
nearshore...primarily extending the Gale Warning to 00z as well. 
Also...winds should pick up prior to the Gale Warning for the 
Indiana nearshore and so did issue an Small Craft Advisory tonight into early 
Sunday. 


Rodriguez 


&& 


Lot watches/warnings/advisories... 
Illinois...none. 
In...none. 
Lm...Small Craft Advisory...lmz740-lmz741-lmz742-lmz743-lmz744- 
lmz745...4 am Sunday to 10 am Sunday. 


Gale Warning...lmz740-lmz741-lmz742-lmz743-lmz744-lmz745...10 am 
Sunday to 7 PM Sunday. 


Gale Warning...lmz777-lmz779...4 am Sunday to 7 PM Sunday. 


&& 


$$ 


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