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National Weather Service Forecast for: St. Charles County
Issued by: NWS National Weather Service Saint Louis, MO
Updated: 606 PM CDT Thu Jun 17 2021
St. Charles , MO
 
Tonight


Mostly Clear
Mostly Clear
Friday


Hot
Hot
Friday
Night

Thunder storm
Thunder storm
Saturday


Thunder storm
Thunder storm
Saturday
Night

Partly Cloudy
Partly Cloudy
Sunday


Hot
Hot
Sunday
Night

Thunder storm
Thunder storm
Monday


Thunder storm
Thunder storm
Monday
Night

Thunder storm
Thunder storm
Lo ≈75°F n/a Lo ≈75°F Hi ≈95°F Lo ≈65°F Hi ≈95°F Lo ≈75°F Hi ≈85°F Lo ≈55°F

 

Tonight
 
Warmer. Mostly clear. Low in the mid to upper 70s. South wind around 10 mph.
Friday
 
Very hot and humid. Mostly sunny. High 97 to 102. Highest heat index readings of around 106 in the late morning and afternoon. Southwest wind 10 to 15 mph. Gusts up to 25 mph in the afternoon.
Friday Night
 
Partly cloudy with a 30 percent chance of showers and thunderstorms. Low in the 70s. Highest heat index readings of around 100 early in the evening. Southwest wind around 10 mph.
Saturday
 
Hot. Partly cloudy with a 30 percent chance of showers and thunderstorms. High in the 90s. Highest heat index readings of around 100 early in the afternoon. Southwest wind around 10 mph.
Saturday Night
 
Partly cloudy. A 20 percent chance of showers in the evening. Low in the upper 60s to mid 70s. Light wind.
Sunday
 
Hot. Mostly sunny. A 20 percent chance of showers in the afternoon. High in the mid 90s.
Sunday Night
 
Partly cloudy with a 30 percent chance of showers and thunderstorms. Low in the lower 70s.
Monday
 
Partly sunny with a 50 percent chance of showers and thunderstorms. High in the mid 80s. Temperature falling into the 70s in the afternoon.
Monday Night
 
Cooler. Partly cloudy with a 30 percent chance of showers and thunderstorms. Low in the upper 50s.
Tuesday
 
Mostly clear. High in the upper 70s.
Tuesday Night
 
Mostly clear. Low in the mid 50s.
Wednesday
 
Mostly clear. High in the upper 70s.
Wednesday Night
 
Mostly clear with a 20 percent chance of showers. Low around 60.
Thursday
 
Partly cloudy with a 30 percent chance of showers. High in the mid 80s.

 

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