Decatur, IL Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Decatur, IL in one place.
Partly sunny, with a high near 78. East southeast wind 5 to 8 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: May 27, 2026 10:00 PM CDT.
The active forecast window currently covers May 29 to Jun 3, 2026 for Decatur, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 29 to Jun 3, 2026
- Latest sync
- May 27, 2026 10:00 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Decatur
Saturday looks like the warmest upcoming period in Decatur at 81 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Tuesday at about 10 mph NE.
The forecast from May 29 through Jun 3 stays mostly dry.
Forecast Details
- Last updated
- May 27, 2026 10:00 PM 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
Mostly cloudy, with a low around 57. East wind around 5 mph.
Partly sunny, with a high near 81. East wind 3 to 7 mph.
Partly cloudy, with a low around 58. East wind around 9 mph.
Mostly sunny, with a high near 80.
Partly cloudy, with a low around 58.
Mostly sunny, with a high near 81.
Mostly clear, with a low around 57.
Sunny, with a high near 79.
Clear, with a low around 56.
Sunny, with a high near 79.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
May 29
|
Partly Sunny
|
78°F |
5 to 8 mph
ESE
|
|
Friday Night
May 29
|
Mostly Cloudy
|
57°F |
5 mph
E
|
|
Saturday
May 30
|
Partly Sunny
|
81°F |
3 to 7 mph
E
|
|
Saturday Night
May 30
|
Partly Cloudy
|
58°F |
9 mph
E
|
|
Sunday
May 31
|
Mostly Sunny
|
80°F |
6 to 9 mph
E
|
|
Sunday Night
May 31
|
Partly Cloudy
|
58°F |
5 mph
E
|
|
Monday
Jun 1
|
Mostly Sunny
|
81°F |
5 to 8 mph
NNE
|
|
Monday Night
Jun 1
|
Mostly Clear
|
57°F |
7 mph
NE
|
|
Tuesday
Jun 2
|
Sunny
|
79°F |
10 mph
NE
|
|
Tuesday Night
Jun 2
|
Clear
|
56°F |
6 to 9 mph
ENE
|
|
Wednesday
Jun 3
|
Sunny
|
79°F |
8 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Decatur.
