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

Updated: 838 PM CDT Sat Jun 13 2026

St. Charles , MO

Tonight Thunder storm	Sunday Thunder storm	Sunday Night Partly Cloudy	Monday Sunny	Monday Night Mostly Clear	Tuesday Thunder storm	Tuesday Night Thunder storm	Wednesday Thunder storm	Wednesday Night Thunder storm
Lo ≈65°F	Hi ≈75°F	Lo ≈55°F	Hi ≈75°F	Lo ≈55°F	Hi ≈85°F	Lo ≈65°F	Hi ≈85°F	Lo ≈70°F

Tonight	Mostly cloudy with a chance of thunderstorms. A slight chance of showers this evening, then a chance of showers after midnight. Locally heavy rainfall possible this evening. Lows in the mid 60s. South winds 5 to 10 mph, becoming west after midnight. Chance of rain 50 percent.
Sunday	Partly sunny. A chance of showers and thunderstorms in the morning. Highs in the upper 70s. Northwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 50 percent.
Sunday Night	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. Chance of rain 30 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	A chance of thunderstorms. Showers, 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 a chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50 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.
Monday	Partly cloudy. Highs in the lower 80s.
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)