Decatur, IL Weather Forecast
Local 7-day forecast
Slight Chance Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Decatur, IL in one place.
A slight chance of rain showers after 7am. Partly sunny, with a high near 66. East southeast wind around 10 mph, with gusts as high as 16 mph.
Local Weather Overview
This forecast page for Decatur, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 9, 2026 2:58 PM CDT.
The active forecast window currently covers Apr 11 to Apr 15, 2026 for Decatur, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 11 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 2:58 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Decatur
Tuesday looks like the warmest upcoming period in Decatur at 83 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 55 degrees F.
The strongest winds are forecast for Sunday at about 13 to 22 mph S.
Precipitation is mentioned in 10 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 2:58 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- ILX
- Radar station
- KILX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of rain showers before 7pm. Mostly cloudy, with a low around 57. South southeast wind 9 to 13 mph, with gusts as high as 21 mph.
A slight chance of rain showers after 1pm. Mostly cloudy, with a high near 77. South wind 13 to 22 mph, with gusts as high as 35 mph.
A slight chance of rain showers before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 80. Chance of precipitation is 60%.
A chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 83.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms likely. Mostly cloudy, with a low around 63.
Showers and thunderstorms likely. Mostly cloudy, with a high near 78.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 11
|
Slight Chance Rain Showers
|
66°F |
10 mph
ESE
|
|
Saturday Night
Apr 11
|
Slight Chance Rain Showers then Mostly Cloudy
|
57°F |
9 to 13 mph
SSE
|
|
Sunday
Apr 12
|
Mostly Cloudy then Slight Chance Rain Showers
|
77°F |
13 to 22 mph
S
|
|
Sunday Night
Apr 12
|
Showers And Thunderstorms Likely
|
62°F |
20 mph
SSW
|
|
Monday
Apr 13
|
Showers And Thunderstorms Likely
|
80°F |
18 mph
SSW
|
|
Monday Night
Apr 13
|
Chance Showers And Thunderstorms
|
65°F |
17 mph
SSW
|
|
Tuesday
Apr 14
|
Chance Showers And Thunderstorms
|
83°F |
14 to 18 mph
SSW
|
|
Tuesday Night
Apr 14
|
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
|
63°F |
17 mph
SSW
|
|
Wednesday
Apr 15
|
Showers And Thunderstorms Likely
|
78°F |
16 to 20 mph
SW
|
|
Wednesday Night
Apr 15
|
Chance Showers And Thunderstorms
|
55°F |
10 to 15 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Decatur.
