Saint Charles County, MO Weather Forecast
County weather hub
Mostly Sunny then Slight Chance Rain Showers
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 slight chance of rain showers after 1pm. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
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
- Aug 23 to Aug 26, 2026
- Latest sync
- Aug 19, 2026 10:10 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Charles County
Wednesday looks like the warmest upcoming period in Saint Charles County at 88 degrees F.
Sunday Night is the coolest period ahead with temperatures near 65 degrees F.
The strongest winds are forecast for Monday at about 3 to 7 mph SE.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 19, 2026 10:10 PM CDT
- Coverage
- 4 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 slight chance of rain showers before 7pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 20%.
A slight chance of rain showers before 1pm. Partly sunny, with a high near 83. Chance of precipitation is 20%.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 67. Chance of precipitation is 20%.
A slight chance of rain showers before 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 20%.
Partly cloudy, with a low around 68.
Mostly sunny, with a high near 88.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Sunday
Aug 23
|
Mostly Sunny then Slight Chance Rain Showers
|
83°F |
3 mph
NE
|
|
Sunday Night
Aug 23
|
Slight Chance Showers And Thunderstorms
|
65°F |
3 mph
E
|
|
Monday
Aug 24
|
Slight Chance Rain Showers
|
83°F |
3 to 7 mph
SE
|
|
Monday Night
Aug 24
|
Partly Cloudy then Slight Chance Rain Showers
|
67°F |
6 mph
E
|
|
Tuesday
Aug 25
|
Slight Chance Rain Showers
|
87°F |
6 mph
SE
|
|
Tuesday Night
Aug 25
|
Partly Cloudy
|
68°F |
3 mph
E
|
|
Wednesday
Aug 26
|
Mostly Sunny
|
88°F |
5 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.
