Saint Clair County, IL Weather Forecast
County weather hub
Showers And Thunderstorms Likely
Compare major city weather across Saint Clair County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of rain showers between 7am and 1pm, then showers and thunderstorms likely. Mostly cloudy. High near 72, with temperatures falling to around 68 in the afternoon. West wind around 10 mph. Chance of precipitation is 60%.
County Weather Overview
This county weather page brings together forecast coverage for Saint Clair County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 15 of 15 mapped cities in Saint Clair County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Apr 10 to Apr 15, 2026
- Latest sync
- Apr 9, 2026 3:57 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Clair County
Tuesday looks like the warmest upcoming period in Saint Clair County at 84 degrees F.
Friday Night is the coolest period ahead with temperatures near 52 degrees F.
The strongest winds are forecast for Sunday at about 8 to 18 mph S.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 9, 2026 3:57 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
A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. Northeast wind 5 to 8 mph. Chance of precipitation is 40%.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 75. East wind around 8 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 59. Chance of precipitation is 30%.
A slight chance of rain showers after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 20%.
A slight chance of rain showers before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Chance of precipitation is 50%.
A slight chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 20%.
A chance of showers and thunderstorms after 7am. Partly sunny, with a high near 84. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Chance of precipitation is 50%.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Apr 10
|
Showers And Thunderstorms Likely
|
72°F |
10 mph
W
|
|
Friday Night
Apr 10
|
Chance Showers And Thunderstorms
|
52°F |
5 to 8 mph
NE
|
|
Saturday
Apr 11
|
Chance Rain Showers
|
75°F |
8 mph
E
|
|
Saturday Night
Apr 11
|
Chance Showers And Thunderstorms then Mostly Cloudy
|
59°F |
8 mph
SE
|
|
Sunday
Apr 12
|
Mostly Cloudy then Slight Chance Rain Showers
|
79°F |
8 to 18 mph
S
|
|
Sunday Night
Apr 12
|
Chance Showers And Thunderstorms
|
64°F |
15 mph
S
|
|
Monday
Apr 13
|
Chance Showers And Thunderstorms
|
82°F |
12 to 16 mph
SW
|
|
Monday Night
Apr 13
|
Slight Chance Showers And Thunderstorms
|
68°F |
10 to 15 mph
S
|
|
Tuesday
Apr 14
|
Chance Showers And Thunderstorms
|
84°F |
10 to 17 mph
S
|
|
Tuesday Night
Apr 14
|
Chance Showers And Thunderstorms
|
66°F |
15 mph
S
|
|
Wednesday
Apr 15
|
Chance Showers And Thunderstorms
|
81°F |
13 to 16 mph
SW
|
|
Wednesday Night
Apr 15
|
Chance Showers And Thunderstorms
|
58°F |
6 to 12 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across Saint Clair County.
Coverage
Forecast coverage currently spans 15 of 15 mapped cities in Saint Clair County.
Largest mapped city population in this region: 40,536.
