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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 328 AM CDT Sun Jun 14 2026
St. Charles , MO
 
Today


Thunder storm
Thunder storm		 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
Hi ≈75°F Lo ≈55°F Hi ≈75°F Lo ≈55°F Hi ≈85°F Lo ≈65°F Hi ≈85°F Lo ≈70°F Hi ≈85°F

 

Today
 
 Mostly cloudy with a chance of showers and thunderstorms this morning, then mostly sunny this afternoon. Highs in the upper 70s. Northwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 40 percent.
Tonight
 
 Mostly clear in the 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 in the upper 50s. Southwest winds around 5 mph.
Tuesday
 
 Mostly sunny. A chance of showers and 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
 
 A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows in the lower 60s. Chance of rain 20 percent.
Wednesday
 
 Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Breezy with highs in the upper 80s. Chance of rain 40 percent.
Wednesday Night
 
 Showers with a chance of thunderstorms in the evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Breezy with lows around 70. Chance of rain 90 percent.
Thursday
 
 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 lower 80s. Chance of rain 60 percent.
Thursday Night
 
 Partly cloudy. A chance of showers with a slight chance of thunderstorms in the evening, then a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 50 percent.
Juneteenth
 
 Mostly sunny. Highs in the lower 80s.
Friday Night
 
 Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 60s.
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.
Zone Forecast
 
 St. Charles County

 

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