DeKalb, Illinois Weather Forecast
Today in DeKalb: mostly sunny with a high near 85°F and a low around 63°F. Rain chance 5%. Best chance of rain is Thursday at 76%. Cooling trend: highs fall from 85°F today to 64°F by Thursday.
Forecast updated 9:05 AM CDT, Oct 12
Active Weather Alerts
7-Day Forecast for DeKalb
Today 10/12
85°/63°
5%
Tue 10/13
83°/67°
46%
Wed 10/14
68°/57°
75%
Thu 10/15
64°/56°
76%
Fri 10/16
56°/44°
30%
Sat 10/17
55°/35°
1%
Sun 10/18
61°/39°
3%
Next 24 Hours
| Now | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | Tue12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sky | | | | |  | | | | |  | | |  | | | | | | | | | | | |
| Temp | 77° | 80° | 82° | 84° | 85° | 85° | 84° | 82° | 79° | 77° | 76° | 75° | 75° | 75° | 75° | 75° | 74° | 73° | 72° | 72° | 71° | 72° | 73° | 75° |
| Rain | 2% | 2% | 3% | 3% | 2% | 3% | 3% | 3% | 3% | 3% | 5% | 5% | 4% | 3% | 2% | 2% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 1% |
| Wind | SW 13 | SW 13 | SW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 11 | SSW 11 | SSW 12 | SSW 12 | SW 13 | SW 12 | SW 12 | WSW 13 | WSW 13 | WSW 13 | WSW 13 | W 12 | W 11 | W 11 | WNW 11 | WNW 11 |
Growing Conditions
Growing degree days
3,201
since Apr 1, base 50°F
Rain, last 30 days
11.99 in
model analysis
Rain, year to date
49.09 in
since Jan 1
2-inch soil temperature
62°F
yesterday, daily average
Reference ET, last 7 days
0.94 in
FAO-56 grass reference
Through Oct 11. Season totals use model analysis for this point and update every morning.
Soil, ET and spray tools for DeKalb →
Current Stats & Observations
NWS Forecast
About DeKalb Weather
DeKalb sits at about 889 feet above sea level in DeKalb County, Illinois. About 66,959 people live in the DeKalb area. Official forecasts and warnings for the area come from the National Weather Service LOT office, and the nearest NEXRAD radar site is KLOT. The city is in USDA plant hardiness zone 5b, where the coldest winter night typically falls between -15 to -10°F. Over the past ten years the last spring freeze has come around Apr 26 and the first fall freeze around Oct 29.
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