National Weather Service Forecast for: Affton MO
Issued by: National Weather Service Saint Louis, MO
Updated: 3:12 pm CDT Jul 16, 2026
 
This
Afternoon
This Afternoon: Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 90. Light and variable wind. Chance of precipitation is 60%.
T-storms
Likely

 Tonight

Tonight: Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 74. Light southwest wind. Chance of precipitation is 60%.
T-storms
Likely then
Partly Cloudy
 Friday

Friday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Mostly sunny, with a high near 91. West wind 3 to 8 mph.
Chance
T-storms

 Friday
Night
Friday Night: Mostly clear, with a low around 75. West wind 3 to 7 mph.
Mostly Clear

 Saturday

Saturday: A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 93. West wind 5 to 9 mph.
Slight Chance
T-storms

 Saturday
Night
Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 75.
Slight Chance
T-storms

 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Mostly Sunny
then Slight
Chance
T-storms
 Sunday
Night
Sunday Night: Mostly clear, with a low around 73.
Mostly Clear

 Monday

Monday: Sunny, with a high near 95.
Sunny
Hi 90 °F Lo 74 °F Hi 91 °F Lo 75 °F Hi 93 °F Lo 75 °F Hi 92 °F Lo 73 °F Hi 95 °F

 

This Afternoon
 
 Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 90. Light and variable wind. Chance of precipitation is 60%.
Tonight
 
 Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 74. Light southwest wind. Chance of precipitation is 60%.
Friday
 
 A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Mostly sunny, with a high near 91. West wind 3 to 8 mph.
Friday Night
 
 Mostly clear, with a low around 75. West wind 3 to 7 mph.
Saturday
 
 A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 93. West wind 5 to 9 mph.
Saturday Night
 
 A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 75.
Sunday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Sunday Night
 
 Mostly clear, with a low around 73.
Monday
 
 Sunny, with a high near 95.
Monday Night
 
 Partly cloudy, with a low around 77.
Tuesday
 
 Mostly sunny, with a high near 95.
Tuesday Night
 
 Partly cloudy, with a low around 71.
Wednesday
 
 Mostly sunny, with a high near 86.
Wednesday Night
 
 Mostly clear, with a low around 67.
Thursday
 
 Mostly sunny, with a high near 86.

 

Forecast from NOAA-NWS for Affton MO.