| 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 5:46pm CDT | ||||||||||||||||||||||||||||||||||||||||
| Saint Louis | ||||||||||||||||||||||||||||||||||||||||
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Heat Advisory issued September 15 at 11:53AM CDT until September 18 at 8:00PM CDT
| Tonight |
A chance of showers and thunderstorms before 2am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 76. Southeast wind around 5 mph. Chance of precipitation is 30%. |
| Wednesday |
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 95. Heat index values as high as 103. Southeast wind 1 to 5 mph. Chance of precipitation is 30%. |
| Wednesday Night |
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 78. Heat index values as high as 103. South wind around 3 mph. Chance of precipitation is 20%. |
| Thursday |
Sunny, with a high near 99. Heat index values as high as 106. West wind around 5 mph. |
| Thursday Night |
Partly cloudy, with a low around 75. North wind around 2 mph. |
| Friday |
Sunny, with a high near 97. |
| Friday Night |
Mostly clear, with a low around 75. |
| Saturday |
Mostly sunny, with a high near 98. |
| Saturday Night |
A slight chance of rain showers after 1am. Partly cloudy, with a low around 74. Chance of precipitation is 20%. |
| Sunday |
A slight chance of rain showers before 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 93. Chance of precipitation is 30%. |
| Sunday Night |
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 40%. |
| Monday |
A chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 40%. |
| Monday Night |
A chance of rain showers before 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 40%. |
| Tuesday |
Partly sunny, with a high near 81. |
Forecast from NOAA-NWS for St. Louis, MO.