Decatur, Illinois Weather Forecast
Today in Decatur: clear skies with a high near 74°F and a low around 48°F. Rain chance 1%. No day tops a 20% rain chance through Thursday. Highs run 72 to 76°F through Thursday.
Forecast updated 3:05 AM CDT, Oct 23
Active Weather Alerts
7-Day Forecast for Decatur
Today 10/23
74°48°
Sat 10/24
74°47°
Sun 10/25
76°47°
Mon 10/26
75°49°
Tue 10/27
72°50°
Wed 10/28
73°49°
Thu 10/29
72°50°
Next 24 Hours
| Now | 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 | 10 PM | 11 PM | Sat12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sky | | | | | | | | | | | | |  | | | | | | | | | | | |
| Temp | 50° | 57° | 62° | 67° | 70° | 72° | 74° | 74° | 74° | 73° | 68° | 63° | 60° | 57° | 56° | 54° | 53° | 52° | 51° | 50° | 49° | 48° | 48° | 47° |
| Rain | 0% | 0% | 0% | 1% | 0% | 0% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 1% | 0% | 0% | 0% | 1% | 1% | 1% | 1% | 1% | 1% |
| Wind | ESE 4 | SE 5 | SE 5 | SSE 5 | SSE 5 | SSE 5 | SE 5 | SE 5 | ESE 5 | ESE 5 | ESE 5 | ESE 6 | ESE 5 | ESE 5 | SE 5 | SE 5 | SE 4 | SE 4 | SE 4 | SE 4 | SE 4 | SE 4 | SE 4 | SE 4 |
Growing Conditions
Growing degree days
3,978
since Apr 1, base 50°F
Rain, last 30 days
4.06 in
model analysis
Rain, year to date
37.58 in
since Jan 1
2-inch soil temperature
55°F
yesterday, daily average
Reference ET, last 7 days
0.66 in
FAO-56 grass reference
Through Oct 22. 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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