National Weather Service Forecast for: Saint Peters MO
Issued by: National Weather Service Saint Louis, MO
Updated: 1:35 pm CDT Oct 6, 2026
 
This
Afternoon
This Afternoon: Sunny, with a high near 80. South wind around 5 mph.
Sunny
 Tonight

Tonight: Clear, with a low around 58. Calm wind becoming south around 6 mph in the evening.
Clear
 Wednesday

Wednesday: Sunny, with a high near 88. Southwest wind around 7 mph.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 57. Light northwest wind.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 82. Light north wind.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 56.
Mostly Clear
 Friday

Friday: Sunny, with a high near 85.
Sunny
 Friday
Night
Friday Night: Clear, with a low around 60.
Clear
 Saturday

Saturday: Sunny, with a high near 89.
Sunny
Hi 80 °F Lo 58 °F Hi 88 °F Lo 57 °F Hi 82 °F Lo 56 °F Hi 85 °F Lo 60 °F Hi 89 °F

 

This Afternoon
 
 Sunny, with a high near 80. South wind around 5 mph.
Tonight
 
 Clear, with a low around 58. Calm wind becoming south around 6 mph in the evening.
Wednesday
 
 Sunny, with a high near 88. Southwest wind around 7 mph.
Wednesday Night
 
 Mostly clear, with a low around 57. Light northwest wind.
Thursday
 
 Sunny, with a high near 82. Light north wind.
Thursday Night
 
 Mostly clear, with a low around 56.
Friday
 
 Sunny, with a high near 85.
Friday Night
 
 Clear, with a low around 60.
Saturday
 
 Sunny, with a high near 89.
Saturday Night
 
 A 20 percent chance of showers after 1am. Partly cloudy, with a low around 61.
Sunday
 
 A 30 percent chance of showers. Mostly sunny, with a high near 81.
Sunday Night
 
 Partly cloudy, with a low around 60.
Columbus Day
 
 Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Saint Peters MO.