Saint Clair County, MO Weather Forecast
County weather hub
Mostly Clear
Compare major city weather across Saint Clair County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly clear. Low around 67, with temperatures rising to around 69 overnight. Southeast wind around 5 mph.
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 1 of 1 mapped cities in Saint Clair County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 29 to Sep 4, 2026
- Latest sync
- Aug 29, 2026 4:41 AM CDT
- Forecast office
- SGF
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Clair County
Sunday looks like the warmest upcoming period in Saint Clair County at 100 degrees F.
Overnight is the coolest period ahead with temperatures near 67 degrees F.
The strongest winds are forecast for Sunday at about 7 to 10 mph S.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Aug 29, 2026 4:41 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- SGF
- Radar station
- KSGF
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Sunny, with a high near 97. Heat index values as high as 99. South wind 5 to 8 mph.
Mostly clear, with a low around 74. Heat index values as high as 96. South wind 5 to 8 mph, with gusts as high as 18 mph.
Sunny, with a high near 100. Heat index values as high as 102. South wind 7 to 10 mph, with gusts as high as 18 mph.
Mostly clear, with a low around 76. South wind 5 to 8 mph.
Sunny, with a high near 100.
Mostly clear, with a low around 76.
Sunny, with a high near 99.
Mostly clear, with a low around 76.
Sunny, with a high near 99.
Mostly clear, with a low around 77.
Sunny, with a high near 99.
Mostly clear, with a low around 76.
A slight chance of showers and thunderstorms between 7am and 1pm. Sunny, with a high near 98.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Aug 29
|
Mostly Clear
|
67°F |
5 mph
SE
|
|
Saturday
Aug 29
|
Sunny
|
97°F |
5 to 8 mph
S
|
|
Saturday Night
Aug 29
|
Mostly Clear
|
74°F |
5 to 8 mph
S
|
|
Sunday
Aug 30
|
Sunny
|
100°F |
7 to 10 mph
S
|
|
Sunday Night
Aug 30
|
Mostly Clear
|
76°F |
5 to 8 mph
S
|
|
Monday
Aug 31
|
Sunny
|
100°F |
6 to 10 mph
SW
|
|
Monday Night
Aug 31
|
Mostly Clear
|
76°F |
6 mph
S
|
|
Tuesday
Sep 1
|
Sunny
|
99°F |
7 mph
S
|
|
Tuesday Night
Sep 1
|
Mostly Clear
|
76°F |
6 mph
S
|
|
Wednesday
Sep 2
|
Sunny
|
99°F |
5 to 8 mph
SW
|
|
Wednesday Night
Sep 2
|
Mostly Clear
|
77°F |
6 mph
S
|
|
Thursday
Sep 3
|
Sunny
|
99°F |
7 mph
SW
|
|
Thursday Night
Sep 3
|
Mostly Clear
|
76°F |
5 mph
S
|
|
Friday
Sep 4
|
Slight Chance Showers And Thunderstorms
|
98°F |
3 to 7 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across Saint Clair County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Saint Clair County.
Largest mapped city population in this region: 1,080.
