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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 1008 PM CDT Wed Sep 17 2025
St. Charles , MO
 
Overnight


Clear
Clear		 Thursday


Sunny
Sunny		 Thursday
Night

Chance rain
Chance rain		 Friday


Thunder storm
Thunder storm		 Friday
Night

Thunder storm
Thunder storm		 Saturday


Thunder storm
Thunder storm		 Saturday
Night

Chance rain
Chance rain		 Sunday


Thunder storm
Thunder storm		 Sunday
Night

Thunder storm
Thunder storm
Lo ≈60°F Hi ≈95°F Lo ≈65°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈65°F

 

Overnight
 
 Clear. Lows around 60. East winds around 5 mph.
Thursday
 
 Sunny. Highs in the lower 90s. Southeast winds around 5 mph.
Thursday Night
 
 Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Southeast winds around 5 mph. Chance of rain 20 percent.
Friday
 
 Partly sunny. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Southwest winds around 5 mph. Chance of rain 50 percent.
Friday Night
 
 A chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the mid 60s. South winds around 5 mph in the evening, becoming light and variable. Chance of rain 50 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.
Saturday Night
 
 Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent.
Sunday
 
 Partly sunny. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40 percent.
Sunday Night
 
 Mostly cloudy. A chance of showers and thunderstorms. Lows in the mid 60s.
Monday
 
 Mostly cloudy. A chance of showers and thunderstorms. Highs in the mid 80s.
Monday Night
 
 Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the mid 60s. Chance of rain 40 percent.
Tuesday
 
 Mostly sunny. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.
Tuesday Night
 
 Partly cloudy. A 20 percent chance of showers. Lows in the lower 60s.
Wednesday
 
 Partly cloudy. A 20 percent chance of showers. Highs in the mid 80s.
Zone Forecast
 
 St. Charles County

 

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