National Weather Service Forecast for: St. Louis, MO
Issued by: National Weather Service St. Louis/St. Charles, MO
Updated: Wed, 16-Sep-2026 3:51am CDT

Saint Louis
 
  Wednesday

Wednesday: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Thursday

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

Friday: Mostly Sunny
Mostly Sunny
Saturday

Saturday: Mostly Sunny
Mostly Sunny
Sunday

Sunday: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Monday

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

Tuesday: Chance Rain Showers
Chance Rain Showers
  Hi 95 °F Hi 98 °F Hi 96 °F Hi 98 °F Hi 94 °F Hi 87 °F Hi 83 °F
 
Overnight

Overnight: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Wednesday
Night
Wednesday Night: Slight Chance Showers And Thunderstorms then Partly Cloudy
Slight Chance Showers And T-Storms then Partly Cloudy
Thursday
Night
Thursday Night: Chance Showers And Thunderstorms then Partly Cloudy
Chance Showers And T-Storms then Partly Cloudy
Friday
Night
Friday Night: Mostly Clear
Mostly Clear
Saturday
Night
Saturday Night: Partly Cloudy then Chance Showers And Thunderstorms
Partly Cloudy then Chance Showers And T-Storms
Sunday
Night
Sunday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
Monday
Night
Monday Night: Chance Showers And Thunderstorms
Chance Showers And T-Storms
 
Lo 77 °F Lo 77 °F Lo 75 °F Lo 75 °F Lo 74 °F Lo 71 °F Lo 66 °F  

Heat Advisory issued September 16 at 2:51AM CDT until September 18 at 8:00PM CDT
 

Overnight
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 77. Northeast wind around 3 mph. Chance of precipitation is 30%.
Wednesday
 
A chance of showers and thunderstorms. Mostly sunny, with a high near 95. Heat index values as high as 106. South wind around 3 mph. Chance of precipitation is 30%.
Wednesday Night
 
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 77. Heat index values as high as 103. South wind around 3 mph. Chance of precipitation is 20%.
Thursday
 
A chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 98. Heat index values as high as 106. West wind around 5 mph. Chance of precipitation is 30%.
Thursday Night
 
A chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 75. Northeast wind around 2 mph. Chance of precipitation is 30%.
Friday
 
Mostly sunny, with a high near 96.
Friday Night
 
Mostly clear, with a low around 75.
Saturday
 
Mostly sunny, with a high near 98.
Saturday Night
 
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. Chance of precipitation is 30%.
Sunday
 
A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 94. Chance of precipitation is 30%.
Sunday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 30%.
Monday
 
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 30%.
Monday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Tuesday
 
A chance of rain showers. Mostly sunny, with a high near 83. Chance of precipitation is 30%.

 

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