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








