National Weather Service Forecast for: Saint Peters MO
Issued by: National Weather Service Saint Louis, MO
Updated: 4:41 pm CST Dec 20, 2025
 
Tonight

Tonight: Partly cloudy, with a low around 27. North wind 3 to 8 mph.
Partly Cloudy
 Sunday

Sunday: Sunny, with a high near 43. Calm wind becoming east around 6 mph.
Sunny
 Sunday
Night
Sunday Night: Partly cloudy, with a low around 31. Southeast wind 5 to 8 mph.
Partly Cloudy
 Monday

Monday: Increasing clouds, with a high near 53. South wind around 8 mph.
Increasing
Clouds
 Monday
Night
Monday Night: Partly cloudy, with a low around 46. South wind 5 to 7 mph.
Partly Cloudy
 Tuesday

Tuesday: Sunny, with a high near 61.
Sunny
 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 44.
Partly Cloudy
 Wednesday

Wednesday: Cloudy, with a high near 67.
Cloudy
 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 57.
Partly Cloudy
Lo 27 °F Hi 43 °F Lo 31 °F Hi 53 °F Lo 46 °F Hi 61 °F Lo 44 °F Hi 67 °F Lo 57 °F

 

Tonight
 
 Partly cloudy, with a low around 27. North wind 3 to 8 mph.
Sunday
 
 Sunny, with a high near 43. Calm wind becoming east around 6 mph.
Sunday Night
 
 Partly cloudy, with a low around 31. Southeast wind 5 to 8 mph.
Monday
 
 Increasing clouds, with a high near 53. South wind around 8 mph.
Monday Night
 
 Partly cloudy, with a low around 46. South wind 5 to 7 mph.
Tuesday
 
 Sunny, with a high near 61.
Tuesday Night
 
 Partly cloudy, with a low around 44.
Wednesday
 
 Cloudy, with a high near 67.
Wednesday Night
 
 Partly cloudy, with a low around 57.
Christmas Day
 
 Sunny, with a high near 74.
Thursday Night
 
 Mostly cloudy, with a low around 52.
Friday
 
 Partly sunny, with a high near 65.
Friday Night
 
 Mostly cloudy, with a low around 44.
Saturday
 
 Mostly cloudy, with a high near 57.

 

Forecast from NOAA-NWS for Saint Peters MO.