National Weather Service Forecast for: Saint Peters MO
Issued by: National Weather Service Saint Louis, MO
Updated: 10:27 am CST Feb 2, 2026
 
Today

Today: Partly sunny, with a high near 37. Calm wind.
Partly Sunny

 Tonight

Tonight: A slight chance of freezing rain after 3am. Mostly cloudy, with a low around 29. 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. Mostly cloudy, 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 around 5 mph becoming calm in the evening.
Mostly Cloudy

 Wednesday

Wednesday: Mostly sunny, with a high near 32. Calm wind becoming north around 5 mph.
Mostly Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 17.
Partly Cloudy

 Thursday

Thursday: Mostly sunny, with a high near 41.
Mostly Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 33.
Mostly Clear

 Friday

Friday: Mostly sunny, with a high near 46.
Mostly Sunny
Hi 37 °F Lo 29 °F Hi 34 °F Lo 18 °F Hi 32 °F Lo 17 °F Hi 41 °F Lo 33 °F Hi 46 °F

 

Today
 
 Partly sunny, with a high near 37. Calm wind.
Tonight
 
 A slight chance of freezing rain after 3am. Mostly cloudy, with a low around 29. 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. Mostly cloudy, 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 around 5 mph becoming calm in the evening.
Wednesday
 
 Mostly sunny, with a high near 32. Calm wind becoming north around 5 mph.
Wednesday Night
 
 Partly cloudy, with a low around 17.
Thursday
 
 Mostly sunny, with a high near 41.
Thursday Night
 
 Mostly clear, with a low around 33.
Friday
 
 Mostly sunny, with a high near 46.
Friday Night
 
 Mostly clear, with a low around 21.
Saturday
 
 Sunny, with a high near 38.
Saturday Night
 
 Partly cloudy, with a low around 26.
Sunday
 
 Mostly sunny, with a high near 44.

 

Forecast from NOAA-NWS for Saint Peters MO.