| National Weather Service Forecast for:
St. Louis, MO Issued by: National Weather Service St. Louis/St. Charles, MO |
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| Updated: Tue, 15-Sep-2026 5:41am CDT | ||||||||||||||||||||||||||||||||||||||||
| Saint Louis | ||||||||||||||||||||||||||||||||||||||||
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Heat Advisory issued September 15 at 1:44AM CDT until September 15 at 7:00PM CDT
| Today |
A chance of showers and thunderstorms after 4pm. Sunny, with a high near 100. Heat index values as high as 108. South wind 6 to 9 mph. Chance of precipitation is 30%. |
| Tonight |
Showers and thunderstorms likely. Mostly cloudy, with a low around 75. Heat index values as high as 104. Southeast wind 2 to 7 mph. Chance of precipitation is 60%. |
| Wednesday |
A chance of showers and thunderstorms. Partly sunny, with a high near 97. Heat index values as high as 107. Southeast wind around 6 mph. Chance of precipitation is 30%. |
| Wednesday Night |
Partly cloudy, with a low around 77. Heat index values as high as 105. South wind around 5 mph. |
| Thursday |
Sunny, with a high near 98. West wind around 5 mph. |
| Thursday Night |
Partly cloudy, with a low around 75. |
| Friday |
Sunny, with a high near 95. |
| Friday Night |
Mostly clear, with a low around 74. |
| Saturday |
Mostly sunny, with a high near 95. |
| Saturday Night |
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 71. Chance of precipitation is 20%. |
| Sunday |
A chance of showers and thunderstorms. Partly sunny, with a high near 85. Chance of precipitation is 30%. |
| Sunday Night |
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 30%. |
| Monday |
A slight chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 20%. |
| Monday Night |
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 60. Chance of precipitation is 20%. |
Forecast from NOAA-NWS for St. Louis, MO.