Saint Charles County, MO Weather Forecast
County weather hub
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 before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 82. 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
- May 25 to May 26, 2026
- Latest sync
- May 19, 2026 11:11 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Charles County
Tuesday looks like the warmest upcoming period in Saint Charles County at 86 degrees F.
Monday Night is the coolest period ahead with temperatures near 63 degrees F.
The strongest winds are forecast for Tuesday at about 3 to 7 mph SE.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- May 19, 2026 11:11 PM CDT
- Coverage
- 2 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 before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Memorial Day
May 25
|
Chance Showers And Thunderstorms
|
82°F |
2 to 6 mph
NE
|
|
Monday Night
May 25
|
Chance Showers And Thunderstorms
|
63°F |
5 mph
E
|
|
Tuesday
May 26
|
Chance Showers And Thunderstorms
|
86°F |
3 to 7 mph
SE
|
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.
