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

Updated: 817 AM CDT Sat Mar 28 2026

St. Charles , MO

Today Sunny	Tonight Partly Cloudy	Sunday Partly Sunny	Sunday Night Partly Cloudy	Monday Mostly Sunny	Monday Night Partly Cloudy	Tuesday Thunder storm	Tuesday Night Thunder storm	Wednesday Rain likely
Hi ≈55°F	Lo ≈35°F	Hi ≈65°F	Lo ≈55°F	Hi ≈85°F	Lo ≈65°F	Hi ≈85°F	Lo ≈45°F	Hi ≈55°F

Today	Widespread frost this morning. Sunny. Highs in the mid 50s. Northeast winds around 5 mph, becoming southeast this afternoon.
Tonight	Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 30s. South winds 5 to 10 mph.
Sunday	Partly sunny. Not as cool with highs in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph.
Sunday Night	Partly cloudy. Not as cool with lows in the mid 50s. South winds 10 to 15 mph.
Monday	Mostly sunny. Not as cool with highs in the lower 80s. South winds 15 to 20 mph with gusts up to 30 mph.
Monday Night	Partly cloudy. Lows in the mid 60s.
Tuesday	Partly sunny with a chance of rain. A chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.
Tuesday Night	Rain. A chance of thunderstorms, mainly in the evening. Much cooler with lows in the upper 40s. Chance of rain 90 percent.
Wednesday	Cloudy. Rain likely, mainly in the morning. Much cooler with highs in the upper 50s. Chance of rain 60 percent.
Wednesday Night	Mostly cloudy with a 50 percent chance of rain. Lows around 40.
Thursday	Rain likely, mainly in the morning. Highs in the mid 50s. Chance of rain 60 percent.
Thursday Night	Mostly cloudy with a 50 percent chance of rain. Lows in the mid 40s.
Friday	Partly sunny with a 40 percent chance of rain. Not as cool with highs in the upper 60s.
Zone Forecast	St. Charles County

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