Home

National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 127 AM CDT Sun May 17 2026
St. Charles , MO
 
Rest
Of Tonight

Mostly Cloudy
Mostly Cloudy		 Sunday


Mostly Sunny
Mostly Sunny		 Sunday
Night

Partly Cloudy
Partly Cloudy		 Monday


Thunder storm
Thunder storm		 Monday
Night

Thunder storm
Thunder storm		 Tuesday


Thunder storm
Thunder storm		 Tuesday
Night

Thunder storm
Thunder storm		 Wednesday


Mostly Cloudy
Mostly Cloudy		 Wednesday
Night

Mostly Cloudy
Mostly Cloudy
Lo ≈65°F Hi ≈85°F Lo ≈75°F Hi ≈85°F Lo ≈70°F Hi ≈85°F Lo ≈55°F Hi ≈75°F Lo ≈55°F

 

Rest Of Tonight
 
 Mostly cloudy. Near steady temperature in the upper 60s. Southeast winds 5 to 10 mph.
Sunday
 
 Mostly sunny. Warmer with highs in the upper 80s. South winds 15 to 20 mph with gusts up to 30 mph.
Sunday Night
 
 Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s. South winds 15 to 20 mph with gusts up to 30 mph.
Monday
 
 Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 80s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 70 percent.
Monday Night
 
 Partly cloudy with a slight chance of showers and thunderstorms. Lows around 70. South winds 15 to 20 mph. Chance of rain 20 percent.
Tuesday
 
 A chance of thunderstorms. Showers. Highs in the mid 80s. Chance of rain near 100 percent.
Tuesday Night
 
 Showers likely with a chance of thunderstorms in the evening, then a chance of showers with a slight chance of thunderstorms after midnight. Cooler with lows in the upper 50s. Chance of rain 70 percent.
Wednesday
 
 Mostly cloudy. A 20 percent chance of showers. Highs in the lower 70s.
Wednesday Night
 
 Mostly cloudy. A 20 percent chance of showers. Lows in the lower 50s.
Thursday
 
 Partly sunny. Highs in the lower 70s.
Thursday Night
 
 Mostly cloudy. A slight chance of showers after midnight. Lows in the mid 50s. Chance of rain 20 percent.
Friday
 
 Mostly cloudy with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 30 percent.
Friday Night
 
 Mostly cloudy with a 20 percent chance of showers. Lows in the upper 50s.
Saturday
 
 Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent.
Zone Forecast
 
 St. Charles County

 

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