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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 452 AM CDT Sun Oct 4 2026
St. Charles , MO
 
Today


Sunny
Sunny		 Tonight


Mostly Clear
Mostly Clear		 Monday


Sunny
Sunny		 Monday
Night

Clear
Clear		 Tuesday


Sunny
Sunny		 Tuesday
Night

Clear
Clear		 Wednesday


Clear
Clear		 Wednesday
Night

Clear
Clear		 Thursday


Clear
Clear
Hi ≈80°F Lo ≈55°F Hi ≈75°F Lo ≈45°F Hi ≈75°F Lo ≈55°F Hi ≈85°F Lo ≈55°F Hi ≈85°F

 

Today
 
 Sunny. Highs around 80. Northwest winds 5 to 10 mph.
Tonight
 
 Mostly clear. Lows in the lower 50s. North winds around 5 mph.
Monday
 
 Sunny. Highs in the mid 70s. Northeast winds around 5 mph.
Monday Night
 
 Clear. Lows in the upper 40s. East winds around 5 mph.
Tuesday
 
 Sunny. Highs in the upper 70s. South winds around 5 mph.
Tuesday Night
 
 Clear. Lows in the mid 50s.
Wednesday
 
 Clear. Highs in the mid 80s.
Wednesday Night
 
 Clear. Lows in the mid 50s.
Thursday
 
 Clear. Highs in the mid 80s.
Thursday Night
 
 Mostly clear. A slight chance of showers in the evening. Lows in the upper 50s. Chance of rain 20 percent.
Friday
 
 Mostly clear. Highs in the mid 80s.
Friday Night
 
 Mostly clear. Lows in the upper 50s.
Saturday
 
 Mostly sunny. Highs in the mid 80s.
Zone Forecast
 
 St. Charles County

 

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