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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 553 PM CDT Sun Jun 14 2026
St. Charles , MO
 
Tonight


Partly Cloudy
Partly Cloudy		 Monday


Sunny
Sunny		 Monday
Night

Mostly Clear
Mostly Clear		 Tuesday


Thunder storm
Thunder storm		 Tuesday
Night

Thunder storm
Thunder storm		 Wednesday


Thunder storm
Thunder storm		 Wednesday
Night

Thunder storm
Thunder storm		 Thursday


Thunder storm
Thunder storm		 Thursday
Night

Chance rain
Chance rain
Lo ≈55°F Hi ≈75°F Lo ≈60°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈70°F Hi ≈85°F Lo ≈60°F

 

Tonight
 
 Clear this evening, then becoming partly cloudy. Cooler with lows in the mid 50s. Northwest winds 10 to 15 mph, diminishing to around 5 mph after midnight.
Monday
 
 Sunny. Highs in the upper 70s. Northwest winds around 5 mph.
Monday Night
 
 Mostly clear. Lows around 60. Southwest winds around 5 mph.
Tuesday
 
 Mostly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the lower 80s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent.
Tuesday Night
 
 Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the lower 60s. Southwest winds 5 to 10 mph. Chance of rain 20 percent.
Wednesday
 
 Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Breezy with highs in the upper 80s. Chance of rain 50 percent.
Wednesday Night
 
 Showers with thunderstorms likely in the evening, then showers likely with a slight chance of thunderstorms after midnight. Breezy with lows around 70. Chance of rain near 100 percent.
Thursday
 
 Showers likely. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 70 percent.
Thursday Night
 
 Partly cloudy. A slight chance of showers in the evening. Cooler with lows around 60. Chance of rain 20 percent.
Monday
 
 Mostly clear. Highs in the lower 80s.
Saturday
 
 Mostly sunny. Highs in the mid 80s.
Saturday Night
 
 Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 30 percent.
Sunday
 
 Partly sunny with a chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.
Zone Forecast
 
 St. Charles County

 

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