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

Updated: 733 PM CST Fri Dec 26 2025

St. Charles , MO

Tonight Fog late	Saturday Fog a.m.	Saturday Night Chance rain	Sunday Thunder storm	Sunday Night Rain likely	Monday Mostly Sunny	Monday Night Mostly Clear	Tuesday Mostly Clear	Tuesday Night Partly Cloudy
Lo ≈45°F	Hi ≈65°F	Lo ≈65°F	Hi ≈75°F	Lo ≈20°F	Hi ≈25°F	Lo ≈20°F	Hi ≈35°F	Lo ≈25°F

Tonight	Mostly cloudy. Areas of fog after midnight. Cooler with lows in the mid 40s. North winds around 5 mph, becoming east after midnight.
Saturday	Mostly cloudy in the morning, then becoming partly sunny. Areas of fog in the morning. Highs in the lower 60s. Southeast winds 5 to 10 mph.
Saturday Night	Cloudy. A slight chance of rain after midnight. Not as cool. Near steady temperature in the lower 60s. South winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent.
Sunday	Cloudy with a slight chance of thunderstorms. A chance of rain in the morning, then rain in the afternoon. Highs in the lower 70s. Temperature falling into the mid 60s in the afternoon. Southwest winds 15 to 20 mph. Chance of rain 90 percent.
Sunday Night	Mostly cloudy with rain likely in the evening, then partly cloudy after midnight. Breezy and much cooler. Less humid with lows around 20. Northwest winds 15 to 25 mph with gusts up to 35 mph. Chance of rain 70 percent. Wind chill values as low as 5 above after midnight.
Monday	Mostly sunny and brisk. Much cooler with highs in the upper 20s. Wind chill values as low as 5 above.
Monday Night	Mostly clear. Lows around 20.
Tuesday	Mostly clear. Highs in the mid 30s.
Tuesday Night	Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 20s.
Wednesday	Mostly cloudy. Highs in the lower 40s.
Wednesday Night	Mostly cloudy. Lows around 20.
Monday	Partly cloudy. Highs in the lower 30s.
Zone Forecast	St. Charles County

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