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

Updated: 239 PM CDT Tue Apr 1 2025

St. Charles , MO

This Afternoon Mostly Sunny	Tonight Mostly Cloudy	Wednesday Thunder storm	Wednesday Night Thunder storm	Thursday Chance rain	Thursday Night Thunder storm	Friday Thunder storm	Friday Night Thunder storm	Saturday Thunder storm
Hi ≈60°F	Lo ≈55°F	Hi ≈75°F	Lo ≈55°F	Hi ≈65°F	Lo ≈50°F	Hi ≈65°F	Lo ≈45°F	Hi ≈55°F

This Afternoon	Mostly sunny. Highs around 60. Southeast winds 15 to 20 mph with gusts up to 30 mph.
Tonight	Mostly cloudy. Not as cool with lows in the mid 50s. Temperature rising into the lower 60s after midnight. Southeast winds 15 to 20 mph with gusts up to 30 mph.
Wednesday	Cloudy. Scattered showers and thunderstorms in the morning, then numerous showers and thunderstorms in the afternoon. Breezy and not as cool. More humid with highs in the mid 70s. South winds 15 to 25 mph with gusts up to 45 mph. Chance of rain 70 percent.
Wednesday Night	Partly cloudy. Scattered showers and thunderstorms in the evening. Lows in the lower 50s. Southwest winds 15 to 20 mph with gusts up to 35 mph, becoming west 5 to 10 mph after midnight. Chance of rain 50 percent.
Thursday	Mostly cloudy. A chance of rain in the morning, then rain in the afternoon. Cooler with highs in the lower 60s. North winds 5 to 10 mph. Chance of rain 80 percent.
Thursday Night	A slight chance of thunderstorms. Showers likely, mainly in the evening. Lows around 50. Chance of rain 70 percent.
Friday	Mostly cloudy. A chance of rain in the morning, then showers with a slight chance of thunderstorms in the afternoon. Highs in the lower 60s. Chance of rain 90 percent.
Friday Night	Showers with a chance of thunderstorms in the evening, then showers with a slight chance of thunderstorms after midnight. Locally heavy rainfall possible in the evening. Lows in the upper 40s. Chance of rain near 100 percent.
Saturday	Showers with a slight chance of thunderstorms. Near steady temperature in the lower 50s. Chance of rain near 100 percent.
Saturday Night	Rain. Lows in the lower 40s. Chance of rain 90 percent.
Sunday	Mostly cloudy with a chance of rain in the morning, then partly sunny with a slight chance of rain in the afternoon. Highs around 50. Chance of rain 40 percent.
Sunday Night	Partly cloudy. Lows in the lower 30s.
Monday	Sunny. Highs in the lower 50s.
Zone Forecast	St. Charles County

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