National Weather Service Forecast for: Saint Peters MO
Issued by: National Weather Service Saint Louis, MO
Updated: 12:26 am CST Dec 5, 2025
 
Overnight

Overnight: Mostly clear, with a low around 9. Light southeast wind.
Mostly Clear

 Friday

Friday: Sunny, with a high near 41. South wind 3 to 6 mph.
Sunny

 Friday
Night
Friday Night: Mostly cloudy, with a low around 29. South wind around 7 mph becoming west after midnight.
Mostly Cloudy

 Saturday

Saturday: Partly sunny, with a high near 37. Northwest wind around 5 mph becoming calm.
Partly Sunny

 Saturday
Night
Saturday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 30. Southeast wind around 6 mph.
Mostly Cloudy
then Chance
Rain
 Sunday

Sunday: A chance of rain before 9am, then a chance of snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Chance
Rain/Snow
then Slight
Chance Snow
 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 14.
Mostly Cloudy

 Monday

Monday: Mostly sunny, with a high near 31.
Mostly Sunny

 Monday
Night
Monday Night: Partly cloudy, with a low around 24.
Partly Cloudy
Lo 9 °F Hi 41 °F Lo 29 °F Hi 37 °F Lo 30 °F Hi 37 °F Lo 14 °F Hi 31 °F Lo 24 °F

 

Overnight
 
 Mostly clear, with a low around 9. Light southeast wind.
Friday
 
 Sunny, with a high near 41. South wind 3 to 6 mph.
Friday Night
 
 Mostly cloudy, with a low around 29. South wind around 7 mph becoming west after midnight.
Saturday
 
 Partly sunny, with a high near 37. Northwest wind around 5 mph becoming calm.
Saturday Night
 
 A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 30. Southeast wind around 6 mph.
Sunday
 
 A chance of rain before 9am, then a chance of snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Sunday Night
 
 Mostly cloudy, with a low around 14.
Monday
 
 Mostly sunny, with a high near 31.
Monday Night
 
 Partly cloudy, with a low around 24.
Tuesday
 
 Mostly sunny, with a high near 46.
Tuesday Night
 
 Mostly cloudy, with a low around 37.
Wednesday
 
 A 30 percent chance of rain. Mostly cloudy, with a high near 45.
Wednesday Night
 
 Mostly cloudy, with a low around 22.
Thursday
 
 Mostly cloudy, with a high near 33.

 

Forecast from NOAA-NWS for Saint Peters MO.