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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 507 AM CDT Sun Aug 23 2026
St. Charles , MO
 
Today


Sunny
Sunny
Tonight


Partly Cloudy
Partly Cloudy
Monday


Sunny
Sunny
Monday
Night

Partly Cloudy
Partly Cloudy
Tuesday


Mostly Sunny
Mostly Sunny
Tuesday
Night

Partly Cloudy
Partly Cloudy
Wednesday


Thunder storm
Thunder storm
Wednesday
Night

Thunder storm
Thunder storm
Thursday


Mostly Clear
Mostly Clear
Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈65°F Hi ≈85°F

 

Today
 
Sunny. Highs in the lower 80s. Northwest winds 5 to 10 mph.
Tonight
 
Partly cloudy. Lows in the lower 60s. North winds around 5 mph, becoming northeast after midnight.
Monday
 
Sunny. Highs in the lower 80s. East winds around 5 mph.
Monday Night
 
Partly cloudy. Lows in the mid 60s. East winds around 5 mph.
Tuesday
 
Mostly sunny. Highs in the mid 80s. Southeast winds around 5 mph.
Tuesday Night
 
Partly cloudy. Lows in the upper 60s.
Wednesday
 
Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20 percent.
Wednesday Night
 
Mostly clear. A slight chance of showers and thunderstorms in the evening. Lows in the upper 60s. Chance of rain 20 percent.
Thursday
 
Mostly clear. Highs in the mid 80s.
Thursday Night
 
Mostly clear. Lows in the mid 60s.
Friday
 
Mostly clear. Highs in the mid 80s.
Friday Night
 
Partly cloudy. A slight chance of showers in the evening. Lows in the mid 60s. Chance of rain 20 percent.
Saturday
 
Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent.
Zone Forecast
 
St. Charles County

 

Forecast from NOAA-NWS for St. Charles County. (Zone forecast)