Decatur, Illinois Weather Forecast
Today in Decatur: clear skies with a high near 83°F and a low around 54°F. Rain chance 0%. Best chance of rain is Wednesday at 67%. Highs run 59 to 91°F through Saturday.
Forecast updated 9:05 PM CDT, Oct 11
Active Weather Alerts
7-Day Forecast for Decatur
Today 10/11
83°/54°
0%
Mon 10/12
90°/63°
4%
Tue 10/13
91°/71°
31%
Wed 10/14
78°/65°
67%
Thu 10/15
73°/60°
65%
Fri 10/16
62°/45°
40%
Sat 10/17
59°/37°
0%
Next 24 Hours
| Now | 11 PM | Mon12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sky |  | |  | | | | | | | | | | | | | | | | | | | | | |
| Temp | 65° | 63° | 63° | 63° | 63° | 63° | 63° | 63° | 63° | 63° | 67° | 72° | 77° | 81° | 84° | 87° | 89° | 90° | 90° | 89° | 86° | 82° | 79° | 77° |
| Rain | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 0% | 1% | 1% | 2% | 2% | 3% | 3% | 4% | 3% | 3% | 3% | 2% | 2% | 2% | 2% | 2% |
| Wind | S 5 | S 5 | S 5 | S 7 | S 7 | S 7 | SSW 8 | SSW 8 | SW 7 | SW 7 | SSW 9 | SW 9 | SW 11 | SW 12 | SW 13 | SW 14 | SW 14 | SW 15 | SW 15 | SSW 14 | SSW 11 | SSW 10 | SSW 10 | SSW 11 |
Growing Conditions
Growing degree days
3,810
since Apr 1, base 50°F
Rain, last 30 days
3.89 in
model analysis
Rain, year to date
36.57 in
since Jan 1
2-inch soil temperature
67°F
yesterday, daily average
Reference ET, last 7 days
1.03 in
FAO-56 grass reference
Through Oct 10. Season totals use model analysis for this point and update every morning.
Soil, ET and spray tools for Decatur →
Current Stats & Observations
NWS Forecast
About Decatur Weather
Decatur sits at about 696 feet above sea level in Macon County, Illinois. About 87,236 people live in the Decatur area. Official forecasts and warnings for the area come from the National Weather Service ILX office, and the nearest NEXRAD radar site is KILX. The city is in USDA plant hardiness zone 6a, where the coldest winter night typically falls between -10 to -5°F. Over the past ten years the last spring freeze has come around Apr 19 and the first fall freeze around Oct 31.
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