Grand Chain, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Grand Chain, IL in one place.
Sunny. High near 96, with temperatures falling to around 93 in the afternoon. Heat index values as high as 106. South southwest wind around 5 mph.
Local Weather Overview
This forecast page for Grand Chain, 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: Sep 15, 2026 5:16 PM CDT.
The active forecast window currently covers Sep 15 to Sep 21, 2026 for Grand Chain, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 15 to Sep 21, 2026
- Latest sync
- Sep 15, 2026 5:16 PM CDT
- Forecast office
- PAH
- Source
- NOAA / NWS
Daily Outlook
This Week in Grand Chain
This Afternoon looks like the warmest upcoming period in Grand Chain at 96 degrees F.
Monday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Monday at about 6 mph W.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 15, 2026 5:16 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- PAH
- Radar station
- KPAH
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 74. South wind around 2 mph.
Sunny. High near 96, with temperatures falling to around 94 in the afternoon. South southwest wind 1 to 5 mph.
Mostly clear, with a low around 74. South southeast wind around 1 mph.
Sunny, with a high near 96. West southwest wind around 3 mph.
Mostly clear, with a low around 72. Wind around 0 mph.
Sunny, with a high near 95. South southwest wind around 1 mph.
Mostly clear, with a low around 72. Southeast wind around 1 mph.
Sunny, with a high near 95. South southwest wind 1 to 5 mph.
Mostly clear, with a low around 72. South southwest wind around 3 mph.
Sunny, with a high near 94. Southwest wind around 5 mph.
Mostly clear, with a low around 69. South southwest wind around 3 mph.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. West wind around 6 mph.
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 65. North northwest wind around 5 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Sep 15
|
Sunny
|
96°F |
5 mph
SSW
|
|
Tonight
Sep 15
|
Mostly Clear
|
74°F |
2 mph
S
|
|
Wednesday
Sep 16
|
Sunny
|
96°F |
1 to 5 mph
SSW
|
|
Wednesday Night
Sep 16
|
Mostly Clear
|
74°F |
1 mph
SSE
|
|
Thursday
Sep 17
|
Sunny
|
96°F |
3 mph
WSW
|
|
Thursday Night
Sep 17
|
Mostly Clear
|
72°F |
0 mph
|
|
Friday
Sep 18
|
Sunny
|
95°F |
1 mph
SSW
|
|
Friday Night
Sep 18
|
Mostly Clear
|
72°F |
1 mph
SE
|
|
Saturday
Sep 19
|
Sunny
|
95°F |
1 to 5 mph
SSW
|
|
Saturday Night
Sep 19
|
Mostly Clear
|
72°F |
3 mph
SSW
|
|
Sunday
Sep 20
|
Sunny
|
94°F |
5 mph
SW
|
|
Sunday Night
Sep 20
|
Mostly Clear
|
69°F |
3 mph
SSW
|
|
Monday
Sep 21
|
Mostly Sunny then Chance Showers And Thunderstorms
|
87°F |
6 mph
W
|
|
Monday Night
Sep 21
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
65°F |
5 mph
NNW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Grand Chain.
Nearby forecast pages are not available for this location yet.