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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 528 AM CDT Sun Oct 18 2026
St. Charles , MO
 
Today


Sunny
Sunny		 Tonight


Clear
Clear		 Monday


Sunny
Sunny		 Monday
Night

Partly Cloudy
Partly Cloudy		 Tuesday


Sunny
Sunny		 Tuesday
Night

Mostly Clear
Mostly Clear		 Wednesday


Mostly Clear
Mostly Clear		 Wednesday
Night

Mostly Clear
Mostly Clear		 Thursday


Mostly Clear
Mostly Clear
Hi ≈65°F Lo ≈40°F Hi ≈75°F Lo ≈45°F Hi ≈75°F Lo ≈45°F Hi ≈75°F Lo ≈45°F Hi ≈75°F

 

Today
 
 Areas of frost this morning. Sunny. Not as cool with highs in the upper 60s. South winds 5 to 10 mph.
Tonight
 
 Clear. Lows around 40. Southeast winds around 5 mph in the evening, becoming light and variable.
Monday
 
 Sunny. Highs in the lower 70s. Light and variable winds, becoming southeast around 5 mph in the afternoon.
Monday Night
 
 Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 40s. Light and variable winds.
Tuesday
 
 Sunny. Highs in the mid 70s. Light and variable winds, becoming east around 5 mph in the afternoon.
Tuesday Night
 
 Mostly clear. Lows in the mid 40s.
Wednesday
 
 Mostly clear. Highs in the upper 70s.
Wednesday Night
 
 Mostly clear. Lows in the mid 40s.
Thursday
 
 Mostly clear. Highs in the upper 70s.
Thursday Night
 
 Clear. Lows in the upper 40s.
Friday
 
 Mostly clear. Highs around 80.
Friday Night
 
 Mostly clear. Lows in the upper 40s.
Saturday
 
 Mostly sunny. Highs around 80.
Zone Forecast
 
 St. Charles County

 

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