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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 924 PM CDT Fri May 16 2025
St. Charles , MO
 
Rest
Of Tonight

Clear
Clear		 Saturday


Sunny
Sunny		 Saturday
Night

Partly Cloudy
Partly Cloudy		 Sunday


Thunder storm
Thunder storm		 Sunday
Night

Thunder storm
Thunder storm		 Monday


Thunder storm
Thunder storm		 Monday
Night

Thunder storm
Thunder storm		 Tuesday


Thunder storm
Thunder storm		 Tuesday
Night

Thunder storm
Thunder storm
Lo ≈55°F Hi ≈75°F Lo ≈55°F Hi ≈75°F Lo ≈65°F Hi ≈75°F Lo ≈65°F Hi ≈75°F Lo ≈55°F

 

Rest Of Tonight
 
 Clear. Lows in the upper 50s. West winds 5 to 10 mph with gusts up to 25 mph.
Saturday
 
 Sunny, cooler with highs in the mid 70s. West winds 10 to 15 mph with gusts up to 30 mph.
Saturday Night
 
 Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 50s. Northwest winds 5 to 10 mph, becoming north after midnight.
Sunday
 
 Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 70s. East winds around 5 mph. Chance of rain 20 percent.
Sunday Night
 
 Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Lows in the lower 60s. East winds 5 to 10 mph. Chance of rain 80 percent.
Monday
 
 Showers with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 80 percent.
Monday Night
 
 Showers with thunderstorms likely in the evening, then showers with a chance of thunderstorms after midnight. Locally heavy rainfall possible in the evening. Lows in the mid 60s. Chance of rain 90 percent.
Tuesday
 
 Showers. A slight chance of thunderstorms in the morning, then thunderstorms likely in the afternoon. Highs in the mid 70s. Chance of rain 90 percent.
Tuesday Night
 
 Showers and thunderstorms likely in the evening, then a chance of showers after midnight. Cooler with lows in the mid 50s. Chance of rain 70 percent.
Wednesday
 
 Mostly cloudy with a 50 percent chance of showers. Cooler with highs in the lower 60s.
Wednesday Night
 
 Partly cloudy. A 20 percent chance of showers. Lows in the upper 40s.
Thursday
 
 Partly cloudy. A 20 percent chance of showers. Highs in the mid 60s.
Thursday Night
 
 Partly cloudy. Lows around 50.
Friday
 
 Mostly sunny with a 20 percent chance of showers. Highs in the lower 70s.
Zone Forecast
 
 St. Charles County

 

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