National Weather Service Forecast for: Saint Peters MO
Issued by: National Weather Service Saint Louis, MO
Updated: 4:46 pm CST Feb 2, 2026
 
Tonight

Tonight: A slight chance of freezing rain after 3am. Mostly cloudy, with a low around 30. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 20%.
Mostly Cloudy
then Slight
Chance
Freezing Rain
 Tuesday

Tuesday: A chance of snow before 9am, then a slight chance of freezing rain between 9am and 10am. Cloudy, then gradually becoming mostly sunny, with a high near 34. North wind 6 to 8 mph. Chance of precipitation is 30%.
Chance Wintry
Mix then
Partly Sunny
 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 18. North wind 3 to 5 mph.
Mostly Cloudy

 Wednesday

Wednesday: Mostly sunny, with a high near 31. North wind 3 to 5 mph.
Mostly Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 17. Light and variable wind.
Mostly Clear

 Thursday

Thursday: Mostly sunny, with a high near 42.
Mostly Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 34.
Mostly Clear

 Friday

Friday: Sunny, with a high near 48.
Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 24.
Mostly Clear
Lo 30 °F Hi 34 °F Lo 18 °F Hi 31 °F Lo 17 °F Hi 42 °F Lo 34 °F Hi 48 °F Lo 24 °F

 

Tonight
 
 A slight chance of freezing rain after 3am. Mostly cloudy, with a low around 30. Calm wind becoming northeast around 5 mph after midnight. Chance of precipitation is 20%.
Tuesday
 
 A chance of snow before 9am, then a slight chance of freezing rain between 9am and 10am. Cloudy, then gradually becoming mostly sunny, with a high near 34. North wind 6 to 8 mph. Chance of precipitation is 30%.
Tuesday Night
 
 Mostly cloudy, with a low around 18. North wind 3 to 5 mph.
Wednesday
 
 Mostly sunny, with a high near 31. North wind 3 to 5 mph.
Wednesday Night
 
 Mostly clear, with a low around 17. Light and variable wind.
Thursday
 
 Mostly sunny, with a high near 42.
Thursday Night
 
 Mostly clear, with a low around 34.
Friday
 
 Sunny, with a high near 48.
Friday Night
 
 Mostly clear, with a low around 24.
Saturday
 
 Mostly sunny, with a high near 39.
Saturday Night
 
 Partly cloudy, with a low around 26.
Sunday
 
 Mostly sunny, with a high near 45.
Sunday Night
 
 Partly cloudy, with a low around 27.
Monday
 
 Mostly sunny, with a high near 49.

 

Forecast from NOAA-NWS for Saint Peters MO.