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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO

Updated: 533 AM CDT Sat May 2 2026

St. Charles , MO

Today Partly Sunny	Tonight Mostly Clear	Sunday Thunder storm	Sunday Night Thunder storm	Monday Thunder storm	Monday Night Thunder storm	Tuesday Thunder storm	Tuesday Night Thunder storm	Wednesday Thunder storm
Hi ≈65°F	Lo ≈40°F	Hi ≈75°F	Lo ≈55°F	Hi ≈80°F	Lo ≈55°F	Hi ≈65°F	Lo ≈45°F	Hi ≈55°F

Today	Partly sunny. Highs in the lower 60s. North winds 5 to 10 mph.
Tonight	Mostly clear. Lows around 40. Northwest winds 5 to 10 mph, becoming south after midnight.
Sunday	Sunny. A slight chance of showers and thunderstorms in the afternoon. Not as cool with highs in the mid 70s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20 percent.
Sunday Night	Mostly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Not as cool with lows in the mid 50s. Southwest winds 5 to 10 mph. Chance of rain 50 percent.
Monday	Mostly sunny. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Highs around 80. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent.
Monday Night	Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 50s. Chance of rain 70 percent.
Tuesday	Showers with a chance of thunderstorms. Highs in the upper 60s.
Tuesday Night	Showers with a chance of thunderstorms. Lows in the upper 40s.
Wednesday	Mostly cloudy with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 50s. Chance of rain 50 percent.
Wednesday Night	Mostly cloudy. A chance of showers, mainly in the evening. Lows in the mid 40s. Chance of rain 50 percent.
Thursday	Mostly sunny. A slight chance of showers in the morning. Highs in the mid 60s. Chance of rain 20 percent.
Thursday Night	Partly cloudy. Lows in the mid 40s. Highs in the lower 70s..
Friday	Partly cloudy. Lows in the mid 40s. Highs in the lower 70s..
Zone Forecast	St. Charles County

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