Alton Pool Forecast

Home

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

Updated: 833 AM CDT Wed Jun 24 2026

St. Charles , MO

Today Thunder storm	Tonight Thunder storm	Thursday Thunder storm	Thursday Night Thunder storm	Friday Thunder storm	Friday Night Thunder storm	Saturday Thunder storm	Saturday Night Thunder storm	Sunday Sunny
Hi ≈85°F	Lo ≈65°F	Hi ≈85°F	Lo ≈65°F	Hi ≈85°F	Lo ≈65°F	Hi ≈85°F	Lo ≈75°F	Hi ≈95°F

Today	Mostly sunny this morning, then mostly cloudy with a chance of showers and thunderstorms this afternoon. Highs in the lower 80s. South winds 5 to 10 mph, becoming southwest this afternoon. Chance of rain 30 percent.
Tonight	Mostly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the mid 60s. Southwest winds around 5 mph. Chance of rain 30 percent.
Thursday	Partly sunny. A chance of showers and thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall in the afternoon. Highs in the mid 80s. West winds around 5 mph, becoming south in the afternoon. Chance of rain 50 percent.
Thursday Night	Thunderstorms likely. Showers. Some thunderstorms may produce heavy rainfall. Lows in the upper 60s. South winds around 5 mph. Chance of rain 90 percent.
Friday	Thunderstorms likely. Showers. Some thunderstorms may produce heavy rainfall. Highs in the lower 80s. Southwest winds 5 to 10 mph. Chance of rain 90 percent.
Friday Night	Thunderstorms likely. Showers likely. Some thunderstorms may produce heavy rainfall. Lows in the upper 60s. Chance of rain 70 percent.
Saturday	A chance of thunderstorms. A chance of showers in the morning, then showers likely in the afternoon. Some thunderstorms may produce heavy rainfall. Highs in the upper 80s. Chance of rain 70 percent.
Saturday Night	Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Some thunderstorms may produce heavy rainfall. Lows in the lower 70s. Chance of rain 50 percent.
Sunday	Sunny. Highs in the mid 90s. Heat index values up to 110 in the afternoon.
Sunday Night	Clear. Lows in the mid 70s. Heat index values up to 110 early in the evening.
Monday	Sunny, hot with highs in the mid 90s. Heat index values up to 115 in the afternoon.
Monday Night	Clear. Lows in the mid 70s. Heat index values up to 110 early in the evening.
Tuesday	Sunny, hot with highs in the mid 90s. Heat index values up to 110 in the afternoon.
Zone Forecast	St. Charles County

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