Saint Charles County, MO Weather Forecast
County weather hub
Partly Sunny then Chance Showers And Thunderstorms
Compare major city weather across Saint Charles County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 93. Heat index values as high as 100. Southwest wind around 3 mph. Chance of precipitation is 40%.
County Weather Overview
This county weather page brings together forecast coverage for Saint Charles County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 9 of 9 mapped cities in Saint Charles County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 9 to Jul 14, 2026
- Latest sync
- Jul 8, 2026 7:21 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Charles County
Thursday looks like the warmest upcoming period in Saint Charles County at 93 degrees F.
Sunday Night is the coolest period ahead with temperatures near 69 degrees F.
The strongest winds are forecast for Sunday at about 2 to 6 mph NE.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 8, 2026 7:21 AM 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
Showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a low around 72. Southwest wind around 3 mph. Chance of precipitation is 80%.
Showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 80%.
Showers and thunderstorms likely. Mostly cloudy, with a low around 71. Chance of precipitation is 70%.
Showers and thunderstorms likely. Partly sunny, with a high near 87. Chance of precipitation is 70%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 69. Chance of precipitation is 20%.
Sunny, with a high near 90.
Clear, with a low around 71.
Sunny, with a high near 92.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Jul 9
|
Partly Sunny then Chance Showers And Thunderstorms
|
93°F |
3 mph
SW
|
|
Thursday Night
Jul 9
|
Showers And Thunderstorms
|
72°F |
3 mph
SW
|
|
Friday
Jul 10
|
Showers And Thunderstorms
|
89°F |
5 mph
W
|
|
Friday Night
Jul 10
|
Showers And Thunderstorms Likely
|
71°F |
3 mph
SW
|
|
Saturday
Jul 11
|
Showers And Thunderstorms Likely
|
87°F |
3 mph
W
|
|
Saturday Night
Jul 11
|
Chance Showers And Thunderstorms
|
70°F |
3 mph
N
|
|
Sunday
Jul 12
|
Chance Showers And Thunderstorms
|
88°F |
2 to 6 mph
NE
|
|
Sunday Night
Jul 12
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
69°F |
1 to 6 mph
NE
|
|
Monday
Jul 13
|
Sunny
|
90°F |
1 to 5 mph
NE
|
|
Monday Night
Jul 13
|
Clear
|
71°F |
3 mph
E
|
|
Tuesday
Jul 14
|
Sunny
|
92°F |
3 mph
N
|
Major City Forecasts
Live forecast snapshots for major cities across Saint Charles County.
Coverage
Forecast coverage currently spans 9 of 9 mapped cities in Saint Charles County.
Largest mapped city population in this region: 89,769.
