National Weather Service Forecast for: St. Louis, MO
Issued by: National Weather Service St. Louis/St. Charles, MO
Updated: Thu, 13-Aug-2026 5:46pm CDT

Saint Louis
 
This
Afternoon
This Afternoon: Sunny
Sunny
Friday

Friday: Slight Chance Showers And Thunderstorms then Mostly Sunny
Slight Chance Showers And T-Storms then Mostly Sunny
Saturday

Saturday: Sunny
Sunny
Sunday

Sunday: Mostly Sunny
Mostly Sunny
Monday

Monday: Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
Slight Chance Rain Showers then Slight Chance Showers And T-Storms
Tuesday

Tuesday: Mostly Sunny
Mostly Sunny
Wednesday

Wednesday: Mostly Sunny
Mostly Sunny
 
Hi 98 °F Hi 100 °F Hi 100 °F Hi 99 °F Hi 89 °F Hi 90 °F Hi 95 °F  
 
Tonight

Tonight: Mostly Clear
Mostly Clear
Friday
Night
Friday Night: Mostly Clear
Mostly Clear
Saturday
Night
Saturday Night: Mostly Clear
Mostly Clear
Sunday
Night
Sunday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Monday
Night
Monday Night: Slight Chance Showers And Thunderstorms then Partly Cloudy
Slight Chance Showers And T-Storms then Partly Cloudy
Tuesday
Night
Tuesday Night: Mostly Clear
Mostly Clear
Wednesday
Night
Wednesday Night: Partly Cloudy then Slight Chance Showers And Thunderstorms
Partly Cloudy then Slight Chance Showers And T-Storms
 
Lo 77 °F Lo 78 °F Lo 78 °F Lo 74 °F Lo 71 °F Lo 74 °F Lo 74 °F  

Extreme Heat Warning issued August 13 at 10:28AM CDT until August 15 at 9:00PM CDT
Extreme Heat Warning issued August 13 at 3:34AM CDT until August 15 at 9:00PM CDT
 

This Afternoon
 
Sunny. High near 98, with temperatures falling to around 94 in the afternoon. Heat index values as high as 105. South wind around 7 mph.
Tonight
 
Mostly clear, with a low around 77. Heat index values as high as 103. South wind around 6 mph.
Friday
 
A slight chance of showers and thunderstorms between 7am and 8am. Mostly sunny, with a high near 100. Heat index values as high as 114. South wind around 7 mph. Chance of precipitation is 20%.
Friday Night
 
Mostly clear, with a low around 78. Heat index values as high as 113. Southeast wind around 7 mph.
Saturday
 
Sunny, with a high near 100. Southwest wind around 7 mph.
Saturday Night
 
Mostly clear, with a low around 78.
Sunday
 
Mostly sunny, with a high near 99.
Sunday Night
 
A chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 74. Chance of precipitation is 40%.
Monday
 
A slight chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 30%.
Monday Night
 
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 71. Chance of precipitation is 30%.
Tuesday
 
Mostly sunny, with a high near 90.
Tuesday Night
 
Mostly clear, with a low around 74.
Wednesday
 
Mostly sunny, with a high near 95.
Wednesday Night
 
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. Chance of precipitation is 20%.

 

Forecast from NOAA-NWS for St. Louis, MO.