Granite City, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Granite City, IL in one place.
A chance of showers and thunderstorms before 4am, then a chance of showers and thunderstorms between 4am and 5am, then a slight chance of showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 74. South wind around 3 mph. Chance of precipitation is 40%.
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: Jul 10, 2026 3:17 AM CDT.
The active forecast window currently covers Jul 10 to Jul 16, 2026 for Granite City, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 10 to Jul 16, 2026
- Latest sync
- Jul 10, 2026 3:17 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Granite City
Thursday looks like the warmest upcoming period in Granite City at 94 degrees F.
Saturday Night is the coolest period ahead with temperatures near 70 degrees F.
The strongest winds are forecast for Monday at about 2 to 9 mph NE.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 10, 2026 3:17 AM CDT
- Coverage
- 7 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
Scattered showers and thunderstorms after 4pm. Partly sunny, with a high near 91. Heat index values as high as 102. West wind 2 to 6 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. North wind 1 to 6 mph. Chance of precipitation is 70%.
A chance of showers and thunderstorms. Partly sunny, with a high near 87. East wind 1 to 6 mph. Chance of precipitation is 70%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 70. Northeast wind 2 to 6 mph. Chance of precipitation is 50%.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 70. Chance of precipitation is 20%.
Sunny, with a high near 90.
Mostly clear, with a low around 71.
Sunny, with a high near 92.
Mostly clear, with a low around 73.
Sunny, with a high near 93.
Mostly clear, with a low around 75.
Sunny, with a high near 94.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 10
|
Chance Showers And Thunderstorms
|
74°F |
3 mph
S
|
|
Friday
Jul 10
|
Partly Sunny then Scattered Showers And Thunderstorms
|
91°F |
2 to 6 mph
W
|
|
Friday Night
Jul 10
|
Chance Showers And Thunderstorms
|
72°F |
1 to 6 mph
N
|
|
Saturday
Jul 11
|
Chance Showers And Thunderstorms
|
87°F |
1 to 6 mph
E
|
|
Saturday Night
Jul 11
|
Chance Showers And Thunderstorms
|
70°F |
2 to 6 mph
NE
|
|
Sunday
Jul 12
|
Slight Chance Showers And Thunderstorms
|
88°F |
3 to 8 mph
NE
|
|
Sunday Night
Jul 12
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
70°F |
2 to 8 mph
NE
|
|
Monday
Jul 13
|
Sunny
|
90°F |
2 to 9 mph
NE
|
|
Monday Night
Jul 13
|
Mostly Clear
|
71°F |
1 to 9 mph
NE
|
|
Tuesday
Jul 14
|
Sunny
|
92°F |
1 to 8 mph
E
|
|
Tuesday Night
Jul 14
|
Mostly Clear
|
73°F |
0 to 8 mph
SE
|
|
Wednesday
Jul 15
|
Sunny
|
93°F |
0 to 6 mph
S
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
75°F |
2 to 6 mph
SE
|
|
Thursday
Jul 16
|
Sunny
|
94°F |
2 to 7 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Granite City.