Decatur, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Decatur, IL in one place.
Sunny, with a high near 83. Northeast wind 7 to 13 mph, with gusts as high as 20 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: Jul 11, 2026 11:41 PM CDT.
The active forecast window currently covers Jul 12 to Jul 18, 2026 for Decatur, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 12 to Jul 18, 2026
- Latest sync
- Jul 11, 2026 11:41 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Decatur
Wednesday looks like the warmest upcoming period in Decatur at 89 degrees F.
Sunday Night is the coolest period ahead with temperatures near 64 degrees F.
The strongest winds are forecast for Sunday at about 7 to 13 mph NE.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 11, 2026 11:41 PM CDT
- Coverage
- 7 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
Clear, with a low around 64. Northeast wind 5 to 10 mph, with gusts as high as 16 mph.
Sunny, with a high near 86. Northeast wind 5 to 9 mph.
Clear, with a low around 66. Northeast wind 1 to 7 mph.
Sunny, with a high near 88. East northeast wind around 6 mph.
Mostly clear, with a low around 69. East southeast wind 0 to 5 mph.
Sunny, with a high near 89.
Mostly clear, with a low around 70.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 89.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 71.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 89.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 71.
A slight chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 89.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Jul 12
|
Sunny
|
83°F |
7 to 13 mph
NE
|
|
Sunday Night
Jul 12
|
Clear
|
64°F |
5 to 10 mph
NE
|
|
Monday
Jul 13
|
Sunny
|
86°F |
5 to 9 mph
NE
|
|
Monday Night
Jul 13
|
Clear
|
66°F |
1 to 7 mph
NE
|
|
Tuesday
Jul 14
|
Sunny
|
88°F |
6 mph
ENE
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
69°F |
0 to 5 mph
ESE
|
|
Wednesday
Jul 15
|
Sunny
|
89°F |
1 to 5 mph
S
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
70°F |
3 mph
SSW
|
|
Thursday
Jul 16
|
Sunny then Slight Chance Showers And Thunderstorms
|
89°F |
3 to 7 mph
SW
|
|
Thursday Night
Jul 16
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
71°F |
6 mph
SW
|
|
Friday
Jul 17
|
Sunny then Slight Chance Showers And Thunderstorms
|
89°F |
8 mph
WSW
|
|
Friday Night
Jul 17
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
71°F |
7 mph
SW
|
|
Saturday
Jul 18
|
Slight Chance Showers And Thunderstorms
|
89°F |
8 to 12 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Decatur.
