Chatham, IL Weather Forecast
Local 7-day forecast
Patchy Fog then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Chatham, IL in one place.
Patchy fog before 9am. Mostly sunny, with a high near 82. Southwest wind 0 to 3 mph.
Local Weather Overview
This forecast page for Chatham, 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: Aug 23, 2026 6:32 PM CDT.
The active forecast window currently covers Aug 24 to Aug 29, 2026 for Chatham, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 6:32 PM CDT
- Forecast office
- ILX
- Source
- NOAA / NWS
Daily Outlook
This Week in Chatham
Wednesday looks like the warmest upcoming period in Chatham at 89 degrees F.
Monday Night is the coolest period ahead with temperatures near 60 degrees F.
The strongest winds are forecast for Thursday at about 3 to 9 mph NW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 6:32 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 clear, with a low around 60. East wind around 3 mph.
Mostly sunny, with a high near 85. Southeast wind around 5 mph.
Partly cloudy, with a low around 65. Southeast wind around 3 mph.
Mostly sunny, with a high near 89. South southwest wind 3 to 8 mph.
A chance of showers and thunderstorms between 7pm and 1am. Mostly clear, with a low around 65. Chance of precipitation is 30%.
Sunny, with a high near 86.
Mostly clear, with a low around 63.
Sunny, with a high near 86.
Partly cloudy, with a low around 64.
A slight chance of rain showers between 7am and 1pm. Mostly sunny, with a high near 87.
A slight chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Patchy Fog then Mostly Sunny
|
82°F |
0 to 3 mph
SW
|
|
Monday Night
Aug 24
|
Mostly Clear
|
60°F |
3 mph
E
|
|
Tuesday
Aug 25
|
Mostly Sunny
|
85°F |
5 mph
SE
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
65°F |
3 mph
SE
|
|
Wednesday
Aug 26
|
Mostly Sunny
|
89°F |
3 to 8 mph
SSW
|
|
Wednesday Night
Aug 26
|
Chance Showers And Thunderstorms
|
65°F |
2 to 6 mph
WSW
|
|
Thursday
Aug 27
|
Sunny
|
86°F |
3 to 9 mph
NW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
63°F |
0 to 7 mph
N
|
|
Friday
Aug 28
|
Sunny
|
86°F |
0 to 3 mph
NNW
|
|
Friday Night
Aug 28
|
Partly Cloudy
|
64°F |
3 mph
E
|
|
Saturday
Aug 29
|
Slight Chance Rain Showers
|
87°F |
5 to 8 mph
SSE
|
|
Saturday Night
Aug 29
|
Slight Chance Showers And Thunderstorms
|
69°F |
6 to 9 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Chatham.