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

Updated: 827 AM CDT Sat Apr 11 2026

St. Charles , MO

Today Chance rain	Tonight Chance rain	Sunday Chance rain	Sunday Night Thunder storm	Monday Thunder storm	Monday Night Mostly Cloudy	Tuesday Thunder storm	Tuesday Night Thunder storm	Wednesday Thunder storm
Hi ≈75°F	Lo ≈60°F	Hi ≈85°F	Lo ≈65°F	Hi ≈85°F	Lo ≈65°F	Hi ≈85°F	Lo ≈65°F	Hi ≈85°F

Today	Partly sunny. A slight chance of showers this afternoon. Highs in the lower 70s. East winds 5 to 10 mph. Chance of rain 20 percent.
Tonight	Partly cloudy. A slight chance of showers in the evening. Not as cool with lows around 60. Southeast winds 5 to 10 mph. Chance of rain 20 percent.
Sunday	Mostly sunny in the morning, then mostly cloudy with a chance of showers in the afternoon. Highs in the lower 80s. South winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 50 percent.
Sunday Night	Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent.
Monday	Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the mid 80s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent.
Monday Night	Mostly cloudy in the evening, then becoming partly cloudy. Lows in the upper 60s.
Tuesday	Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 30 percent.
Tuesday Night	Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 50 percent.
Wednesday	A chance of thunderstorms. Showers likely, mainly in the morning. Highs in the mid 80s. Chance of rain 60 percent.
Wednesday Night	Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the evening, then showers likely after midnight. Lows in the mid 60s. Chance of rain 70 percent.
Thursday	Showers likely with a slight chance of thunderstorms in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 70 percent.
Thursday Night	Partly cloudy in the evening, then clearing. A slight chance of thunderstorms in the evening. A chance of showers. Lows in the lower 60s. Chance of rain 50 percent.
Friday	Mostly 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 lower 80s. Chance of rain 40 percent.
Zone Forecast	St. Charles County

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