| National Weather Service Forecast for:
St. Louis, MO Issued by: National Weather Service St. Louis/St. Charles, MO |
||||||||||||||||||||||||||||||||||||||||
| Updated: Thu, 03-Sep-2026 11:15pm CDT | ||||||||||||||||||||||||||||||||||||||||
| Saint Louis | ||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||
Extreme Heat Warning issued September 3 at 2:45PM CDT until September 5 at 8:00PM CDT
| Tonight |
Mostly clear, with a low around 78. South wind around 5 mph. |
| Friday |
Sunny, with a high near 101. Heat index values as high as 108. Southwest wind around 5 mph. |
| Friday Night |
Mostly clear, with a low around 77. Heat index values as high as 106. Southwest wind 1 to 5 mph. |
| Saturday |
Mostly sunny, with a high near 101. Heat index values as high as 108. West wind around 5 mph. |
| Saturday Night |
Mostly clear, with a low around 76. Northeast wind 1 to 5 mph. |
| Sunday |
Sunny, with a high near 96. |
| Sunday Night |
Mostly clear, with a low around 70. |
| Labor Day |
Sunny, with a high near 94. |
| Monday Night |
Mostly clear, with a low around 71. |
| Tuesday |
Sunny, with a high near 99. |
| Tuesday Night |
Mostly clear, with a low around 77. |
| Wednesday |
Sunny, with a high near 100. |
| Wednesday Night |
A slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 77. Chance of precipitation is 20%. |
| Thursday |
A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 95. Chance of precipitation is 20%. |
Forecast from NOAA-NWS for St. Louis, MO.