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

Updated: 209 AM CDT Sun Jul 13 2025

St. Charles , MO

Rest Of Tonight Mostly Cloudy	Sunday Thunder storm	Sunday Night Thunder storm	Monday Thunder storm	Monday Night Thunder storm	Tuesday Thunder storm	Tuesday Night Thunder storm	Wednesday Thunder storm	Wednesday Night Thunder storm
Lo ≈75°F	Hi ≈85°F	Lo ≈70°F	Hi ≈85°F	Lo ≈75°F	Hi ≈85°F	Lo ≈75°F	Hi ≈95°F	Lo ≈75°F

Rest Of Tonight	Mostly cloudy. Near steady temperature in the lower 70s. East winds around 5 mph.
Sunday	Partly sunny with a slight chance of showers and thunderstorms in the morning, then mostly cloudy with a chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Temperature falling into the lower 80s in the afternoon. East winds around 5 mph, becoming south in the afternoon. Chance of rain 50 percent.
Sunday Night	Mostly cloudy. A slight chance of showers and thunderstorms in the evening. Patchy fog after midnight. Lows around 70. Southwest winds around 5 mph in the evening, becoming light and variable. Chance of rain 20 percent.
Monday	Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Southeast winds around 5 mph. Chance of rain 20 percent.
Monday Night	Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Southeast winds around 5 mph. Chance of rain 20 percent.
Tuesday	Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50 percent.
Tuesday Night	Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent.
Wednesday	Partly cloudy. A chance of showers and thunderstorms. Highs in the lower 90s.
Wednesday Night	Partly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s.
Thursday	Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 40 percent. Heat index values up to 100.
Thursday Night	Mostly cloudy. A chance of showers and thunderstorms in the evening. Lows in the lower 70s. Chance of rain 40 percent.
Friday	Partly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20 percent.
Friday Night	Partly cloudy. A slight chance of showers and thunderstorms. Lows around 70.
Saturday	Partly cloudy. A slight chance of showers and thunderstorms. Highs in the upper 80s.
Zone Forecast	St. Charles County

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