National Weather Service Forecast for: Saint Peters MO
Issued by: National Weather Service Saint Louis, MO
Updated: 12:21 am CST Dec 18, 2025
 
Overnight

Overnight: Isolated showers after 5am. Cloudy, with a temperature rising to around 55 by 5am. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Isolated
Showers

 Thursday

Thursday: Showers, mainly before noon. Temperature falling to around 45 by 5pm. South wind 14 to 17 mph becoming west in the afternoon. Winds could gust as high as 34 mph. Chance of precipitation is 80%.
Showers then
Scattered
Showers
 Thursday
Night
Thursday Night: Mostly clear, with a low around 24. Breezy, with a west wind 11 to 21 mph, with gusts as high as 36 mph.
Partly Cloudy
and Breezy
then Mostly
Clear
 Friday

Friday: Sunny, with a high near 39. West wind 6 to 10 mph becoming south in the afternoon.
Sunny

 Friday
Night
Friday Night: Partly cloudy, with a low around 33. South wind 8 to 11 mph, with gusts as high as 21 mph.
Partly Cloudy

 Saturday

Saturday: Mostly sunny, with a high near 56.
Mostly Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 27.
Partly Cloudy

 Sunday

Sunday: Mostly sunny, with a high near 43.
Mostly Sunny

 Sunday
Night
Sunday Night: Mostly cloudy, with a low around 30.
Mostly Cloudy
Lo 50 °F⇑ Hi 56 °F⇓ Lo 24 °F Hi 39 °F Lo 33 °F Hi 56 °F Lo 27 °F Hi 43 °F Lo 30 °F

 

Overnight
 
 Isolated showers after 5am. Cloudy, with a temperature rising to around 55 by 5am. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Thursday
 
 Showers, mainly before noon. Temperature falling to around 45 by 5pm. South wind 14 to 17 mph becoming west in the afternoon. Winds could gust as high as 34 mph. Chance of precipitation is 80%.
Thursday Night
 
 Mostly clear, with a low around 24. Breezy, with a west wind 11 to 21 mph, with gusts as high as 36 mph.
Friday
 
 Sunny, with a high near 39. West wind 6 to 10 mph becoming south in the afternoon.
Friday Night
 
 Partly cloudy, with a low around 33. South wind 8 to 11 mph, with gusts as high as 21 mph.
Saturday
 
 Mostly sunny, with a high near 56.
Saturday Night
 
 Partly cloudy, with a low around 27.
Sunday
 
 Mostly sunny, with a high near 43.
Sunday Night
 
 Mostly cloudy, with a low around 30.
Monday
 
 Partly sunny, with a high near 47.
Monday Night
 
 Mostly cloudy, with a low around 41.
Tuesday
 
 Partly sunny, with a high near 59.
Tuesday Night
 
 Mostly cloudy, with a low around 47.
Wednesday
 
 A 20 percent chance of rain. Mostly cloudy, with a high near 62.

 

Forecast from NOAA-NWS for Saint Peters MO.