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 91. Southwest wind 9 to 14 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: Oct 12, 2026 12:12 AM CDT.
The active forecast window currently covers Oct 13 to Oct 18, 2026 for Decatur, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 12:12 AM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Decatur
Tuesday looks like the warmest upcoming period in Decatur at 91 degrees F.
Saturday Night is the coolest period ahead with temperatures near 35 degrees F.
The strongest winds are forecast for Friday at about 21 to 24 mph NW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 12:12 AM CDT
- Coverage
- 6 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 chance of showers and thunderstorms between 7pm and 10pm, then a chance of showers and thunderstorms between 10pm and 4am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 68. Southwest wind 3 to 7 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 80. Northwest wind 3 to 7 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Showers and thunderstorms. Mostly cloudy, with a low around 59. Northeast wind 7 to 12 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 74. Chance of precipitation is 80%.
Showers and thunderstorms before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 7am. Partly sunny, with a high near 64.
Partly cloudy, with a low around 38.
Sunny, with a high near 58.
Clear, with a low around 35.
Sunny, with a high near 65.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Sunny
|
91°F |
9 to 14 mph
SW
|
|
Tuesday Night
Oct 13
|
Chance Showers And Thunderstorms
|
68°F |
3 to 7 mph
SW
|
|
Wednesday
Oct 14
|
Showers And Thunderstorms
|
80°F |
3 to 7 mph
NW
|
|
Wednesday Night
Oct 14
|
Showers And Thunderstorms
|
59°F |
7 to 12 mph
NE
|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
74°F |
13 mph
E
|
|
Thursday Night
Oct 15
|
Showers And Thunderstorms then Chance Showers And Thunderstorms
|
52°F |
12 to 21 mph
W
|
|
Friday
Oct 16
|
Chance Showers And Thunderstorms then Partly Sunny
|
64°F |
21 to 24 mph
NW
|
|
Friday Night
Oct 16
|
Partly Cloudy
|
38°F |
13 to 20 mph
NNW
|
|
Saturday
Oct 17
|
Sunny
|
58°F |
7 to 13 mph
NNW
|
|
Saturday Night
Oct 17
|
Clear
|
35°F |
2 to 6 mph
E
|
|
Sunday
Oct 18
|
Sunny
|
65°F |
5 to 12 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Decatur.
