Dekalb, Illinois Weather Conditions

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Current Conditions

  • 62°
  • Clear
  • Wind: South 5 mph
  • Humidity: 88%
  • Visibility: 10.0 miles
  • Dew Point: 59°
  • Pressure: 30.04 in. +

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Next 12 Hours

11  pm
2  am
5  am
8  am
11  am
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
Clear
65°
62°
61°
68°
76°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Sunday
  • Clear
  • High: 82 °
  • Low: 62 °
  • Clear
  • Monday
  • Partly Cloudy
  • High: 85 °
  • Low: 61 °
  • Partly Cloudy
  • Tuesday
  • Overcast
  • High: 72 °
  • Low: 53 °
  • Overcast
  • Wednesday
  • Partly Cloudy
  • High: 73 °
  • Low: 55 °
  • Partly Cloudy
  • Thursday
  • Partly Cloudy
  • High: 75 °
  • Low: 60 °
  • Partly Cloudy

Forecast for Dekalb, Illinois

Updated: 3:10 PM CDT on July 4, 2015

  • Tonight

    Clear. Lows in the lower 60s. South winds around 5 mph.

  • Sunday

    Mostly sunny. Warm. Highs in the mid 80s. South winds 5 to 10 mph.

  • Sunday Night

    Clear. Lows in the mid 60s. South winds 5 to 10 mph.

  • Monday

    Mostly sunny in the morning then becoming partly sunny. Breezy. Highs in the mid 80s. South winds 15 to 25 mph with gusts up to 30 mph.

  • Monday Night

    Showers and thunderstorms likely. Lows in the mid 60s. Southwest winds 10 to 15 mph in the evening becoming west after midnight. Chance of precipitation 70 percent.

  • Tuesday

    Partly sunny. A 20 percent chance of showers and thunderstorms in the morning. Highs in the mid 70s.

  • Tuesday Night

    Partly cloudy. Lows in the mid 50s.

  • Wednesday

    Partly cloudy. Highs in the mid 70s.

  • Wednesday Night and Thursday

    Partly cloudy. Lows in the upper 50s. Highs in the mid 70s.

  • Thursday Night and Friday

    Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows in the lower 60s. Highs in the upper 70s.

  • Friday Night and Saturday

    Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows in the mid 60s. Highs in the lower 80s.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: South DeKalb, DeKalb, IL

Updated: 11:22 PM CDT

Temperature: 64.4 °F Dew Point: 61 °F Humidity: 90% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 11:22 PM CDT

Temperature: 70.5 °F Dew Point: 62 °F Humidity: 75% Wind: Calm Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

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

Updated: 11:22 PM CDT

Temperature: 68.7 °F Dew Point: 62 °F Humidity: 78% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: DeKalb, IL

Updated: 11:19 PM CDT

Temperature: 67.8 °F Dew Point: 63 °F Humidity: 83% Wind: WSW at 1.0 mph Pressure: 29.97 in Hourly Precipitation: - Heat Index: - Graphs

Location: Sycamore, IL

Updated: 11:22 PM CDT

Temperature: 64.8 °F Dew Point: 62 °F Humidity: 89% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: MesoWest, Malta, IL

Updated: 10:30 PM CDT

Temperature: 67 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Heron Creek, Sycamore, IL

Updated: 11:22 PM CDT

Temperature: 63.9 °F Dew Point: 61 °F Humidity: 91% Wind: Calm Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Out On the Farm, Clare, IL

Updated: 11:20 PM CDT

Temperature: 64.0 °F Dew Point: 61 °F Humidity: 91% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Ellen Oaks Subdivision, Genoa, IL

Updated: 11:22 PM CDT

Temperature: 66.0 °F Dew Point: 62 °F Humidity: 86% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Country Meadows, Kirkland, IL

Updated: 11:08 PM CDT

Temperature: 65.8 °F Dew Point: 61 °F Humidity: 83% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Burlington Prairie Forest Preserve, Sycamore, IL

Updated: 11:15 PM CDT

Temperature: 66.7 °F Dew Point: 63 °F Humidity: 87% Wind: Calm Pressure: 29.84 in Hourly Precipitation: - Heat Index: - Graphs

Location: South Sycamore Street, Hinckley, IL

Updated: 11:22 PM CDT

Temperature: 68.4 °F Dew Point: 61 °F Humidity: 76% Wind: North at - Pressure: 29.88 in Hourly Precipitation: - Heat Index: - Graphs

Location: Genoa Road, Genoa, IL

Updated: 11:17 PM CDT

Temperature: 66.3 °F Dew Point: 64 °F Humidity: 91% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: APRSWXNET, Elburn, IL

Updated: 10:59 PM CDT

Temperature: 65 °F Dew Point: 61 °F Humidity: 87% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Columbine, Elburn, IL

Updated: 11:15 PM CDT

Temperature: 64.9 °F Dew Point: 61 °F Humidity: 87% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Columbine Square, Elburn, IL

Updated: 11:13 PM CDT

Temperature: 65.8 °F Dew Point: 62 °F Humidity: 87% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Prairie Highlands, Elburn, IL

Updated: 11:20 PM CDT

Temperature: 67.9 °F Dew Point: 62 °F Humidity: 83% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Cheval de Selle, Elburn, IL

Updated: 11:14 PM CDT

Temperature: 63.3 °F Dew Point: 62 °F Humidity: 97% Wind: Calm Pressure: 30.01 in Hourly Precipitation: - Heat Index: - Graphs

Location: Hampshire, IL, Hampshire, IL

Updated: 11:22 PM CDT

Temperature: 65.4 °F Dew Point: 61 °F Humidity: 85% Wind: Calm Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: K9GPC, Rochelle, IL

Updated: 11:22 PM CDT

Temperature: 67.6 °F Dew Point: 61 °F Humidity: 80% Wind: Calm Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

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

Updated: 11:22 PM CDT

Temperature: 65.7 °F Dew Point: 61 °F Humidity: 86% Wind: Calm Pressure: 30.01 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: OakGrove, Hampshire, IL

Updated: 11:14 PM CDT

Temperature: 64.0 °F Dew Point: 62 °F Humidity: 92% Wind: Calm Pressure: 29.99 in Hourly Precipitation: - Heat Index: - Graphs

Location: Campton Hills, Campton Hills, IL

Updated: 11:22 PM CDT

Temperature: 65.0 °F Dew Point: 62 °F Humidity: 90% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: APRSWXNET, Wasco, IL

Updated: 10:47 PM CDT

Temperature: 66 °F Dew Point: 59 °F Humidity: 78% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Windswept Acres, Marengo, IL

Updated: 11:19 PM CDT

Temperature: 65.5 °F Dew Point: 63 °F Humidity: 91% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Saint Charles Burr Road, Saint Charles, IL

Updated: 11:14 PM CDT

Temperature: 64.6 °F Dew Point: 61 °F Humidity: 87% Wind: Calm Pressure: 29.72 in Hourly Precipitation: - Heat Index: - Graphs

Location: Mill Creek, Geneva, IL

Updated: 11:15 PM CDT

Temperature: 65.9 °F Dew Point: 60 °F Humidity: 82% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Mill Creek (Blackberry Way), Geneva, IL

Updated: 11:22 PM CDT

Temperature: 63.7 °F Dew Point: 60 °F Humidity: 89% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: 3 Lakes, Saint Charles, IL

Updated: 10:00 PM CDT

Temperature: 66.6 °F Dew Point: 60 °F Humidity: 78% Wind: Calm Pressure: 29.75 in Hourly Precipitation: - Heat Index: - Graphs

Location: Paw Paw, Il, Paw Paw, IL

Updated: 11:22 PM CDT

Temperature: 66.4 °F Dew Point: 61 °F Humidity: 83% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Chicago/Romeoville Illinois 
1004 PM CDT Sat Jul 4 2015 


Short term... 
203 PM CDT 


Through Sunday afternoon... 


The lake breeze boundary continues to move inland towards Ord/mdw 
and into Northern Lake and Porter counties in Indiana. Still an off 
chance for a rogue short lived shower or storm popping on the lake 
breeze boundary yet this afternoon before the boundary washes out 
early this evening. Cumulus is most extensive south of a mdw-jot line 
with another area toward the WI border at middle afternoon which is 
coincident with the small amount of instability that has been 
developing...with a few cumulus in between these areas. Otherwise temperatures 
will be a little slower to cool than previous evenings and level off 
in the lower 60s for most areas overnight but with middle 60s in the 
Chicago metropolitan area. An upper level ridge will crest the area tonight 
while a shortwave trough moving across the eastern Dakotas and 
Nebraska this afternoon dampens out. Dry conditions will persist and 
the airmass will modify with 850 mb temperatures warming slightly to 15-16c 
and h92 temperatures warming to 21-22c. Local 850 mb/h92 climatology supports 
highs in the middle/upper 80s. Southerly winds will steadily increase 
through the afternoon so the increased mixing may allow a few sites 
to reach 90. The lake breeze details will be somewhat troublesome to 
pin down. Flow will be very light through the morning which would 
support an inland moving boundary allowing areas within a few miles 
of the lake to cool into the lower 70s after an initial warm up in 
the morning but the steadily increasing wind may help push the 
boundary back towards the lake allowing many of these same areas to 
warm up late in the day. If that occurs as expected Lakefront areas 
of Illinois would likely be held to around 80 for highs with 
Northeast Lake County Illinois being a bit cooler with a southeast wind 
of the lake setting up there. Northwest Indiana Lakeshore areas 
should warm to the middle/upper 80s with offshore flow taking over 
during the afternoon. 


Mdb 


&& 


Long term... 
302 PM CDT 


Sunday night through Saturday... 


A low pressure system is currently over Manitoba and a secondary low 
will form along the primary low/S cold front Sunday evening over the 
Central Plains. The secondary low will deepen as it moves over the 
upper Midwest Monday. The majority of the warning area will be dry 
Monday with only a chance of thunderstorms west of a Woodstock to 
Peru Illinois line Monday afternoon. Expecting ample warm air advection with high 
temperatures getting near 90 across northern Illinois and Northwest Indiana. 
Winds will be gusting up to 30 miles per hour especially along the Illinois/WI state 
line Monday afternoon. 


Showers and thunderstorms spread across the region Monday night and 
have medium confidence in how quickly the precipitation shifts east. Model 
soundings are dry so precipitation could take a bit longer as the showers 
moisten the environment. Model soundings also feature cape of 
varying amounts. The usually too moist NAM has values over 2000 j/kg 
while the GFS has less than 1000 j/kg. Therefore could see some 
stronger storms but confidence is low. 


The lows cold front stalls just south of the warning area across 
central Illinois and Indiana Tuesday. So showers and thunderstorms will 
slowly shift to the southeast and may see lingering showers and 
storms south of a valpo to Pontiac line Tuesday afternoon and then 
south of a Fairbury Illinois to Fowler Indiana line Tuesday night into 
Wednesday. Only have medium confidence in how long showers and 
storms will linger over the far southern warning area. Temperatures on 
Tuesday will be much cooler with highs in the 70s and only right 
around 60 along the lake. 


Outside of the lingering cold front...high pressure builds over the 
region Wednesday and a low passes just to our south across central 
Illinois and Indiana Wednesday night into Thursday. Inherited a slight 
chance of showers and storms across the entire warning area Thursday 
and kept them in case the low shifts north or the weak shortwave 
that swings through at the same time forces some precipitation. 


We warm back into the low 80s late next week with a chance of 
periodic showers and storms. Have low confidence in occurrence and 
coverage of storms as the long term models differ on the pattern and 
how features will evolve. Therefore left the chance of precipitation in the 
forecast. 


Jee 


&& 


Aviation... 


//Ord and mdw concerns...updated 03z... 


* brief MVFR visible in haze/smoke overnight. 


* South winds near 10 knots Sunday...should keep lake breeze east of 
Ord/mdw. 


Ratzer 


//discussion...updated 03z... 


Ord/mdw 1-min ASOS showing 5-7sm in haze with few007 noted at Ord. 
This appears to be the annual July 4th fireworks smoke haze... 
which may bring some temporary MVFR visible for the next few hours. 


Previous discussion from 00z... 


Weak surface pressure gradient across the region has allowed lake 
breeze to develop and push inland across Lake/Cook County Illinois this 
afternoon...though boundary had stalled just east of Ord/mdw with 
peak diurnal mixing providing just enough light west flow to 
offset weak lake breeze. Decreasing boundary layer mixing early 
this evening should allow the lake breeze to resume a westward 
drift and will likely bring a shift to light east winds at Ord/mdw 
between 00-01z...though winds will be less than 10 knots. Lake breeze 
boundary should wash out this evening with very light south- 
southwest wind overnight. Slightly stronger south winds Sunday 
should keep lake breeze east of Ord/mdw...with speeds near 10 knots 
and perhaps even a few 11-13 knots during peak afternoon mixing. VFR 
conditions through period...with only some few 5000-6000 feet 
diurnal cumulus and few cirrus. 


Ratzer 


//Ord and mdw confidence...updated 03z... 


* medium confidence haze/smoke impact overnight. 


* High confidence all other elements. 


Ratzer 


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


Monday...thunderstorms and rain likely Monday night. Gusty south winds 25-30 knots. 


Tuesday...chance morning thunderstorms and rain. North-northeast winds. 


Wednesday...dry/VFR...then slight chance thunderstorms and rain Wednesday night. East 
winds. 


Thursday...slight chance thunderstorms and rain. Southeast winds. 


Friday...chance thunderstorms and rain. South winds. 


Ratzer 


&& 


Marine... 
302 PM CDT 


High pressure is over the region and it will slide east through 
Sunday with winds becoming south late tonight into Sunday. A surface low 
will form over the Central Plains Sunday afternoon and deepen as it 
moves over Lake Superior Monday evening. As such...winds increase in 
speed with 30kt gusts possible over the north half of the lake Monday 
afternoon. Wind speeds will be in excess of 40kt around 1500 feet above the 
surface...but a Stout stable layer should keep those gusts from 
mixing down to the surface. A Small Craft Advisory will likely be 
needed Monday as wind gusts will be hazardous to small craft. The 
lows cold front sweeps over the lake Monday night with winds 
becoming northwest behind the front. Winds diminish and become 
variable in direction as high pressure builds in behind the cold 
front Tuesday night. Winds become more organized out of the south 
Thursday as the high moves over the eastern U.S. 


Jee 


&& 


Lot watches/warnings/advisories... 
Illinois...none. 
In...none. 
Lm...none. 
&& 


$$ 


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