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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 233 AM CDT Sun May 31 2026
St. Charles , MO
 
Rest
Of Tonight

Mostly Cloudy
Mostly Cloudy		 Sunday


Partly Sunny
Partly Sunny		 Sunday
Night

Thunder storm
Thunder storm		 Monday


Thunder storm
Thunder storm		 Monday
Night

Thunder storm
Thunder storm		 Tuesday


Sunny
Sunny		 Tuesday
Night

Clear
Clear		 Wednesday


Clear
Clear		 Wednesday
Night

Mostly Clear
Mostly Clear
Lo ≈65°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈55°F Lo ≈55°F Lo ≈55°F

 

Rest Of Tonight
 
 Mostly cloudy. Near steady temperature in the upper 60s. East winds 5 to 10 mph.
Sunday
 
 Partly sunny with a 20 percent chance of showers. Highs in the lower 80s. Southeast winds 5 to 10 mph.
Sunday Night
 
 Partly cloudy with showers likely with a slight chance of thunderstorms in the evening, then mostly cloudy with showers with a chance of thunderstorms after midnight. Lows in the mid 60s. Southeast winds around 5 mph. Chance of rain 80 percent.
Monday
 
 Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the mid 80s. East winds around 5 mph. Chance of rain 50 percent.
Monday Night
 
 Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the lower 60s. Northeast winds around 5 mph. Chance of rain 20 percent.
Tuesday
 
 Sunny. Highs in the lower 80s.
Tuesday Night
 
 Clear. Lows in the upper 50s. Highs in the lower 80s..
Wednesday
 
 Clear. Lows in the upper 50s. Highs in the lower 80s..
Wednesday Night
 
 Mostly clear. Lows in the upper 50s.
Thursday
 
 Mostly clear. Highs in the mid 80s.
Thursday Night
 
 Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 60s.
Friday
 
 Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20 percent.
Friday Night
 
 Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent.
Saturday
 
 Partly sunny with a chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50 percent.
Zone Forecast
 
 St. Charles County

 

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