Dekalb, Illinois Weather Conditions

Your Weather

To update your location please enter your ZIP code, city, state, airport code or country in the field below. Weather by E-mail: Forecast storm alerts. Weather E-Mail Alert Sign Up »

Current Conditions

  • 42°
  • Overcast
  • Wind: North 13 mph
  • Humidity: 93%
  • Visibility: 7.0 miles
  • Dew Point: 40°
  • Pressure: 30.06 in. 0
  • Heat Index: 36

Select a Section

Click a section below for more information.

Next 12 Hours

8  am
11  am
2  pm
5  pm
8  pm
Overcast
Overcast
Overcast
Overcast
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
42°
50°
55°
55°
49°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Mostly Cloudy
  • High: 57 °
  • Low: 40 °
  • Mostly Cloudy
  • Saturday
  • Rain
  • High: 51 °
  • Low: 42 °
  • Rain
  • Sunday
  • Mostly Cloudy
  • High: 59 °
  • Low: 38 °
  • Mostly Cloudy
  • Monday
  • Clear
  • High: 65 °
  • Low: 43 °
  • Clear
  • Tuesday
  • Clear
  • High: 70 °
  • Low: 51 °
  • Clear

Forecast for Dekalb, Illinois

Updated: 3:43 am CDT on April 29, 2016

  • Today

    Mostly cloudy. Patchy fog in the morning. Highs in the mid 50s. Northeast winds around 10 mph.

  • Tonight

    Mostly cloudy. Lows in the lower 40s. Northeast winds 10 to 15 mph.

  • Saturday

    Cloudy with rain. Breezy. Highs in the lower 50s. East winds 15 to 25 mph with gusts up to 30 mph. Chance of precipitation 80 percent.

  • Saturday Night

    Cloudy. Showers likely in the evening...then a chance of showers after midnight. Lows in the lower 40s. Northeast winds 10 to 20 mph. Gusts up to 30 mph in the evening. Chance of precipitation 60 percent.

  • Sunday

    Mostly cloudy with a 30 percent chance of light showers. Highs in the upper 50s. Northeast winds 10 to 20 mph with gusts up to 30 mph.

  • Sunday Night

    Partly cloudy in the evening then clearing. A 20 percent chance of light showers. Lows in the upper 30s.

  • Monday

    Mostly sunny in the morning then becoming partly cloudy. Highs in the lower 60s.

  • Monday Night

    Partly cloudy. Lows in the mid 40s.

  • Tuesday

    Partly cloudy. Highs in the upper 60s.

  • Tuesday Night through Wednesday Night

    Partly cloudy. Lows in the upper 40s. Highs in the upper 60s.

  • Thursday

    Partly cloudy. Highs in the mid 60s.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Maplewood, DeKalb, IL

Updated: 8:54 AM CDT

Temperature: 42.8 °F Dew Point: 40 °F Humidity: 91% Wind: NNE at 5.0 mph Pressure: 30.07 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: South DeKalb, DeKalb, IL

Updated: 8:56 AM CDT

Temperature: 42.6 °F Dew Point: 40 °F Humidity: 91% Wind: NE at 3.0 mph Pressure: 30.06 in Hourly Precipitation: 0.00 in Windchill: 43 °F Graphs

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

Updated: 8:56 AM CDT

Temperature: 42.8 °F Dew Point: 40 °F Humidity: 88% Wind: NNE at 6.0 mph Pressure: 30.03 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

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

Updated: 8:56 AM CDT

Temperature: 42.2 °F Dew Point: 40 °F Humidity: 90% Wind: NNW at 1.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Rob's Horsepower Haven, DeKalb, IL

Updated: 8:55 AM CDT

Temperature: 41.9 °F Dew Point: 40 °F Humidity: 92% Wind: NE at 7.0 mph Pressure: 30.07 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: River Mist, DeKalb, IL

Updated: 8:56 AM CDT

Temperature: 42.8 °F Dew Point: 42 °F Humidity: 96% Wind: ENE at 10.3 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: South Pointe, DeKalb, IL

Updated: 8:51 AM CDT

Temperature: 43.1 °F Dew Point: 41 °F Humidity: 91% Wind: North at 1.0 mph Pressure: 30.08 in Hourly Precipitation: 0.00 in Windchill: 43 °F Graphs

Location: DeKalb, IL

Updated: 8:43 AM CDT

Temperature: 42.5 °F Dew Point: 41 °F Humidity: 95% Wind: NNW at 5.0 mph Pressure: 30.04 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: Sycamore, IL

Updated: 8:56 AM CDT

Temperature: 41.9 °F Dew Point: 40 °F Humidity: 92% Wind: North at 10.1 mph Pressure: 30.09 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Heron Creek, Sycamore, IL

Updated: 8:56 AM CDT

Temperature: 42.3 °F Dew Point: 40 °F Humidity: 90% Wind: NNE at 3.0 mph Pressure: 30.06 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Out On the Farm, Clare, IL

Updated: 8:55 AM CDT

Temperature: 42.6 °F Dew Point: 41 °F Humidity: 92% Wind: NNE at 12.0 mph Pressure: 30.07 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: South Grove, Kirkland, IL

Updated: 8:45 AM CDT

Temperature: 42.1 °F Dew Point: 40 °F Humidity: 94% Wind: North at 8.3 mph Pressure: 30.03 in Hourly Precipitation: - Windchill: 37 °F Graphs

Location: Ellen Oaks Subdivision, Genoa, IL

Updated: 7:46 AM CDT

Temperature: 41.4 °F Dew Point: 41 °F Humidity: 97% Wind: North at - Pressure: 30.10 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Herrmann Family Farms, LLC., Shabbona, IL

Updated: 8:56 AM CDT

Temperature: 42.8 °F Dew Point: 42 °F Humidity: 95% Wind: NNE at 6.8 mph Pressure: 29.11 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: Highway 23, Waterman, IL

Updated: 8:56 AM CDT

Temperature: 45.1 °F Dew Point: 41 °F Humidity: 85% Wind: North at - Pressure: 30.15 in Hourly Precipitation: - Windchill: 45 °F Graphs

Location: Redwood Court, Genoa, IL

Updated: 8:56 AM CDT

Temperature: 43.7 °F Dew Point: 40 °F Humidity: 85% Wind: North at - Pressure: 30.11 in Hourly Precipitation: 0.00 in Windchill: 44 °F Graphs

Location: Burlington Prairie Forest Preserve, Sycamore, IL

Updated: 8:43 AM CDT

Temperature: 42.3 °F Dew Point: 40 °F Humidity: 93% Wind: NNE at 6.8 mph Pressure: 29.86 in Hourly Precipitation: - Windchill: 38 °F Graphs

Location: Genoa Road, Genoa, IL

Updated: 8:43 AM CDT

Temperature: 43.5 °F Dew Point: 42 °F Humidity: 94% Wind: North at 2.0 mph Pressure: 30.08 in Hourly Precipitation: 0.00 in Windchill: 44 °F Graphs

Location: APRSWXNET, Elburn, IL

Updated: 8:39 AM CDT

Temperature: 42 °F Dew Point: 40 °F Humidity: 94% Wind: NNE at 2 mph Pressure: 30.06 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Cambridge, Elburn, IL

Updated: 8:41 AM CDT

Temperature: 42.4 °F Dew Point: 41 °F Humidity: 93% Wind: NNE at 6.0 mph Pressure: 30.04 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Columbine Square, Elburn, IL

Updated: 8:52 AM CDT

Temperature: 41.7 °F Dew Point: 40 °F Humidity: 93% Wind: East at 8.0 mph Pressure: 30.02 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: Prairie Valley North, Elburn, IL

Updated: 8:56 AM CDT

Temperature: 42.1 °F Dew Point: 40 °F Humidity: 91% Wind: NNE at 7.8 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: Prairie Highlands, Elburn, IL

Updated: 8:55 AM CDT

Temperature: 43.0 °F Dew Point: 41 °F Humidity: 94% Wind: NNE at 2.0 mph Pressure: 30.07 in Hourly Precipitation: 0.00 in Windchill: 43 °F Graphs

Location: Cheval de Selle, Elburn, IL

Updated: 8:47 AM CDT

Temperature: 41.9 °F Dew Point: 41 °F Humidity: 95% Wind: NNE at 10.9 mph Pressure: 30.02 in Hourly Precipitation: - Windchill: 36 °F Graphs

Location: Seaton Street, Elburn, IL

Updated: 8:56 AM CDT

Temperature: 45.1 °F Dew Point: 40 °F Humidity: 83% Wind: North at - Pressure: 30.08 in Hourly Precipitation: - Windchill: 45 °F Graphs

Location: Griffith Avenue, Elburn, IL

Updated: 8:55 AM CDT

Temperature: 44.6 °F Dew Point: 42 °F Humidity: 91% Wind: North at - Pressure: 29.26 in Hourly Precipitation: - Windchill: 45 °F Graphs

Location: Hampshire, IL, Hampshire, IL

Updated: 8:56 AM CDT

Temperature: 42.0 °F Dew Point: 40 °F Humidity: 91% Wind: NE at 6.0 mph Pressure: 30.09 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: K9GPC, Rochelle, IL

Updated: 8:56 AM CDT

Temperature: 43.9 °F Dew Point: 41 °F Humidity: 88% Wind: NNW at 3.8 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Woolf Ct., Rochelle, IL

Updated: 8:51 AM CDT

Temperature: 43.5 °F Dew Point: 41 °F Humidity: 90% Wind: North at - Pressure: 30.31 in Hourly Precipitation: - Windchill: 44 °F Graphs

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

Updated: 8:56 AM CDT

Temperature: 42.1 °F Dew Point: 41 °F Humidity: 95% Wind: North at 2.0 mph Pressure: 30.08 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: OakGrove, Hampshire, IL

Updated: 8:48 AM CDT

Temperature: 42.8 °F Dew Point: 40 °F Humidity: 88% Wind: NNW at 4.7 mph Pressure: 29.94 in Hourly Precipitation: - Windchill: 40 °F Graphs

Location: Elodie Drive, Elburn, IL

Updated: 8:56 AM CDT

Temperature: 44.2 °F Dew Point: 40 °F Humidity: 84% Wind: North at - Pressure: 28.56 in Hourly Precipitation: - Windchill: 44 °F Graphs

Location: APRSWXNET, Rochelle, IL

Updated: 8:30 AM CDT

Temperature: 43 °F Dew Point: 41 °F Humidity: 91% Wind: North at 9 mph Pressure: 30.03 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Dugan Road, Sugar Grove, IL

Updated: 8:52 AM CDT

Temperature: 43.5 °F Dew Point: 41 °F Humidity: 91% Wind: North at - Pressure: 30.12 in Hourly Precipitation: 0.00 in Windchill: 44 °F Graphs

Location: Geneva, IL

Updated: 8:55 AM CDT

Temperature: 42.3 °F Dew Point: 40 °F Humidity: 91% Wind: South at 6.0 mph Pressure: 30.02 in Hourly Precipitation: 0.00 in Windchill: 39 °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 
630 am CDT Friday Apr 29 2016 


Short term... 
254 am CDT 


Today through tonight... 


Weakening closed low over southern WI/Lake Michigan will shear 
eastward across the Great Lakes region this morning...along with 
associated weak surface low. Subsidence in the wake of this 
feature is indicated by rising heights and drying/warming of the 
column from middle-morning into this evening. This should bring an 
end to any lingering light rain/drizzle early in the day. Light 
anticyclonic surface winds will maintain cool northeast flow...through 
forecast soundings do indicate that some thinning/erosion of low 
clouds is possible late in the day. Any brief peaks of sun will 
not do much to boost temperatures however. Low level thermal fields in 
good agreement with guidance numbers for afternoon highs...ranging 
from the 40s at the Lake Shore to the middle/upper 50s across north 
central Illinois...and low/middle 60s far south counties. 


Weather forecast office lot forecast area briefly finds itself beneath short wave 
ridge axis tonight...although influence of the next upper low 
emerging from the central/southern rockies begins overnight 
primarily in the form of strengthening cool easterly winds across 
the County Warning Area and redevelopment and thickening of cloud cover as the 
stationary frontal boundary currently over the Southern Plains and 
lower Mississippi Valley develops northward as a warm front. Some 
of the available guidance spreads precipitation into the far southern 
counties of the County Warning Area prior to Saturday morning...and while the 00z 
WRF/21z sref might be a bit too far north given the spread in 
model output...at least some low chance probability of precipitation remain appropriate 
across the south after midnight tonight. 


Ratzer 


&& 


Long term... 
254 am CDT 


Saturday through Thursday... 


Main forecast focus is on continuation of cool/wet weather 
through the weekend...as plains upper eventually is absorbed by 
eastern North American upper trough. 


Upper low is prognosticated to be over the Central High plains Saturday 
morning with surface low pressure over eastern Kansas. Middle-level 
short wave energy is depicted rotating northeastward around the 
upper low and into the region during the day...as 30-40 knots 850 mb 
winds work to lift the elevated warm frontal zone across central 
and northern IL/in. Period of increased moisture 
convergence/moisture flux on the nose of 1+ inch precipitable water axis 
supports highest probability of precipitation during the day Saturday. Plume of 7-7.5 c/km 
700-500 mb lapse rates and weak coupled jet structure aloft also 
point to embedded elevated thunder potential especially across the 
southern half of the County Warning Area. Guidance varies a bit with placement and 
amounts...though a general 0.90-1.25 inch quantitative precipitation forecast axis is noted across 
the central/southern parts of the County Warning Area by midnight Saturday night. 
Precipitation threat continues Saturday night and into Sunday as upper 
low circulation shears eastward along nearly stationary elevated 
baroclinic zone...though lighter amounts and coverage are 
anticipated as overall dynamics weaken and drier air is entrained 
in middle-levels per forecast soundings. The weakening upper low 
circulation eventually is absorbed into upper trough over 
northeastern North America Sunday night with deeper drying noted. 
Thicker cloud cover... precipitation and persistent east to northeast low 
level winds will keep temperatures below normal through the 
weekend. Low level thermal fields support general guidance trends 
of highs from the 40s (near the lake) and lower 50s across the 
northern County Warning Area Saturday...with upper 50s in the south. 925-950 temperatures 
are actually a little warmer Sunday north and with potential for 
some partial clearing in the afternoon highs in the upper 
50s/around 60 appear reasonable away from cool northeast flow off 
the lake. 


For days 4-7...Monday through Thursday...troughing over eastern 
North America remains dominant through the period with general 
model agreement in bringing a relatively strong middle-level short 
wave and associated surface trough across the region in north- 
northwest flow in the Wednesday time frame. Slightly below normal 
temperatures look to persist outside of Tuesday-Wednesday period with the 
approach of the cold front...with the Tuesday night/Wednesday 
period also having the best chance for some scattered showers with 
frontal passage. Maintained a blended guidance approach with 
temperatures...generally low-middle 60s away from Lake Michigan and low-middle 
50s near the lake with upper 60s/around 70 Tuesday-Wednesday. 


Ratzer 


&& 


Aviation... 
for the 12z tafs... 


Low ceilings and patchy fog continue to be the main forecast 
challenges this morning. IFR stratus deck stretches from central 
Illinois/in north to near central WI early this morning...with cloud bases 
across the Chicago/Rockford terminals ranging from 004-009. There is 
an off chance we may lose another hundred feet or so over the next 1- 
2 hours but with sunrise and daytime heating expect a gradual 
increase in ceilings with MVFR conditions returning middle to late this 
morning...then scattering to VFR at some point this afternoon though 
confidence remains low-medium in specifics. Light north/north-northwest winds early 
this morning will veer to the northeast through the morning hours 
and pick up to around 10 knots where they should remain through most of 
the day. Low pressure lifting across the plains this evening and 
tonight will cause winds to veer further to the east late this 
evening and overnight with increasingly gusty conditions expected on 
Saturday. Showers will overspread the region on Saturday...though 
the best chances appear to be beyond the current taf period. 


Bmd 


&& 


Marine... 
246 am CDT 


High pressure will remain just north of Lake Michigan today 
allowing light flow once again and afternoon lake breezes to 
develop. Low pressure is prognosticated to deepen over the plains tonight 
into Saturday allowing northeast winds to pick back up into the 15 
to 25 knots range by Saturday evening...with 30 knots winds not out of 
the realm of possibility. The strong northeast breeze will persist 
into Sunday...then should diminish again Sunday night into Monday 
as the low departs east and high pressure builds back across the 
region. The ridge axis will move east of Lake Michigan Monday 
night as another low pressure system develops over Hudson Bay 
allowing winds to turn south to southwesterly. The low will drive 
a cold front across Lake Michigan around midweek. 


Bmd 


&& 


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


$$ 


Visit US at http://weather.Gov/Chicago (all lowercase) 


Follow US on facebook...twitter...and youtube at: 
www.Facebook.Com/nwschicago 
www.Twitter.Com/nwschicago 
www.Youtube.Com/nwschicago 



National Weather Service Glossary of Abbreviations

Non-Expanded Version (with abbreviations)

Powered by the Weather Underground, Inc.