Sunday
Mostly sunny
High:
31°F
Mostly sunny, with a high near 31. Calm wind becoming south around 6 mph in the morning.
Saint Charles, MO Weather - Extended Forecast
Sunday Night
Mostly cloudy
Overnight low:
21°F
Mostly cloudy, with a low around 21.
Monday
Partly sunny
High:
37°F
Partly sunny, with a high near 37.
Monday Night
Mostly cloudy
Overnight low:
24°F
Mostly cloudy, with a low around 24.
Tuesday
Mostly cloudy
High:
38°F
Tuesday Night
Chance of rain
Overnight low:
27°F
Wednesday
Chance of snow
High:
35°F
Wednesday Night
Mostly cloudy
Overnight low:
21°F
Thursday
Partly sunny
High:
37°F