| National Weather Service Forecast for:
St. Louis, MO Issued by: National Weather Service St. Louis/St. Charles, MO |
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| Updated: Mon, 31-Aug-2026 5:51pm CDT | ||||||||||||||||||||||||||||||||||||||||
| Saint Louis | ||||||||||||||||||||||||||||||||||||||||
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Heat Advisory issued August 31 at 2:29PM CDT until September 4 at 8:00PM CDT
| Tonight |
Mostly clear, with a low around 78. Heat index values as high as 100. South wind around 6 mph. |
| Tuesday |
Sunny, with a high near 99. Heat index values as high as 102. Southwest wind around 6 mph. |
| Tuesday Night |
Mostly clear, with a low around 80. Heat index values as high as 101. South wind around 6 mph. |
| Wednesday |
Sunny, with a high near 100. Heat index values as high as 105. Southwest wind around 7 mph. |
| Wednesday Night |
Mostly clear, with a low around 80. South wind around 6 mph. |
| Thursday |
Sunny, with a high near 100. |
| Thursday Night |
Mostly clear, with a low around 80. |
| Friday |
Sunny, with a high near 99. |
| Friday Night |
Mostly clear, with a low around 78. |
| Saturday |
Mostly sunny, with a high near 97. |
| Saturday Night |
Partly cloudy, with a low around 75. |
| Sunday |
Mostly sunny, with a high near 93. |
| Sunday Night |
Partly cloudy, with a low around 71. |
| Labor Day |
Mostly sunny, with a high near 93. |
Forecast from NOAA-NWS for St. Louis, MO.