Home

National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 540 AM CDT Mon May 19 2025
St. Charles , MO
 
Today


Thunder storm
Thunder storm
Tonight


Thunder storm
Thunder storm
Tuesday


Thunder storm
Thunder storm
Tuesday
Night

Thunder storm
Thunder storm
Wednesday


Mostly Sunny
Mostly Sunny
Wednesday
Night

Partly Cloudy
Partly Cloudy
Thursday


Mostly Sunny
Mostly Sunny
Thursday
Night

Partly Cloudy
Partly Cloudy
Friday


Mostly Sunny
Mostly Sunny
Hi ≈75°F Lo ≈65°F Hi ≈80°F Lo ≈55°F Hi ≈65°F Lo ≈50°F Hi ≈65°F Lo ≈45°F Hi ≈70°F

 

Today
 
Mostly cloudy this morning, then becoming partly sunny. A chance of thunderstorms. Showers likely, mainly this morning. Highs in the upper 70s. Southeast winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 60 percent.
Tonight
 
Thunderstorms likely. Showers. Lows in the mid 60s. Southeast winds 10 to 15 mph with gusts up to 30 mph. Chance of rain near 100 percent.
Tuesday
 
Mostly sunny. Showers and thunderstorms likely, mainly in the morning. Highs around 80. South winds 10 to 15 mph, becoming southwest in the afternoon. Chance of rain 70 percent.
Tuesday Night
 
Mostly clear. A slight chance of showers and thunderstorms in the evening. Cooler. Less humid with lows in the mid 50s. West winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent.
Wednesday
 
Mostly sunny. Cooler with highs in the upper 60s. West winds 15 to 20 mph with gusts up to 30 mph.
Wednesday Night
 
Partly cloudy with a 20 percent chance of showers. Lows around 50.
Thursday
 
Mostly sunny. Highs in the mid 60s.
Thursday Night
 
Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 40s.
Friday
 
Mostly sunny. Highs around 70.
Friday Night
 
Mostly cloudy. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the lower 50s. Chance of rain 40 percent.
Saturday
 
Mostly cloudy with a slight chance of thunderstorms. A chance of showers. Highs in the upper 60s. Chance of rain 40 percent.
Saturday Night
 
Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the mid 50s. Highs in the lower 70s..
Sunday
 
Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the mid 50s. Highs in the lower 70s..
Zone Forecast
 
St. Charles County

 

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