Granite City, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Granite City, IL in one place.
Sunny, with a high near 84. Southeast wind 2 to 6 mph.
Local Weather Overview
This forecast page for Granite City, 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 1:41 PM CDT.
The active forecast window currently covers Aug 24 to Aug 29, 2026 for Granite City, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 1:41 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Granite City
Wednesday looks like the warmest upcoming period in Granite City at 90 degrees F.
Monday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Thursday at about 2 to 9 mph NW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 1:41 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 66. East wind 2 to 7 mph.
Mostly sunny, with a high near 86. Southeast wind around 6 mph.
Partly cloudy, with a low around 69.
Mostly sunny, with a high near 90.
A slight chance of showers and thunderstorms between 7pm and 1am. Mostly clear, with a low around 70. Chance of precipitation is 20%.
Sunny, with a high near 89.
Mostly clear, with a low around 68.
Sunny, with a high near 87.
Partly cloudy, with a low around 68.
A slight chance of rain showers between 7am and 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Sunny
|
84°F |
2 to 6 mph
SE
|
|
Monday Night
Aug 24
|
Partly Cloudy
|
66°F |
2 to 7 mph
E
|
|
Tuesday
Aug 25
|
Mostly Sunny
|
86°F |
6 mph
SE
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
69°F |
1 to 6 mph
SE
|
|
Wednesday
Aug 26
|
Mostly Sunny
|
90°F |
1 to 5 mph
SW
|
|
Wednesday Night
Aug 26
|
Slight Chance Showers And Thunderstorms
|
70°F |
5 mph
SW
|
|
Thursday
Aug 27
|
Sunny
|
89°F |
2 to 9 mph
NW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
68°F |
1 to 8 mph
N
|
|
Friday
Aug 28
|
Sunny
|
87°F |
0 to 6 mph
NW
|
|
Friday Night
Aug 28
|
Partly Cloudy
|
68°F |
2 to 6 mph
NE
|
|
Saturday
Aug 29
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
88°F |
2 to 7 mph
SE
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms
|
71°F |
7 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Granite City.