| National Weather Service Forecast for:
St. Louis, MO Issued by: National Weather Service St. Louis/St. Charles, MO |
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| Updated: Sat, 19-Sep-2026 4:51am CDT | ||||||||||||||||||||||||||||||||||||||||
| Saint Louis | ||||||||||||||||||||||||||||||||||||||||
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Heat Advisory issued September 19 at 4:15AM CDT until September 19 at 8:00PM CDT
| Overnight |
Clear, with a low around 76. South wind around 3 mph. |
| Saturday |
Mostly sunny, with a high near 99. Heat index values as high as 103. Southwest wind 3 to 7 mph. |
| Saturday Night |
Partly cloudy, with a low around 75. Southwest wind around 5 mph. |
| Sunday |
A chance of rain showers between 8am and noon, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 94. West wind 2 to 6 mph. Chance of precipitation is 30%. |
| Sunday Night |
Showers and thunderstorms likely. Mostly cloudy, with a low around 69. Northeast wind around 7 mph. Chance of precipitation is 70%. |
| Monday |
Showers and thunderstorms likely before 1pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 79. Chance of precipitation is 70%. |
| Monday Night |
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 50%. |
| Tuesday |
A slight chance of rain showers before 7am. Partly sunny, with a high near 72. Chance of precipitation is 20%. |
| Tuesday Night |
Mostly cloudy, with a low around 56. |
| Wednesday |
Mostly sunny, with a high near 74. |
| Wednesday Night |
Partly cloudy, with a low around 57. |
| Thursday |
Mostly sunny, with a high near 76. |
| Thursday Night |
Mostly cloudy, with a low around 60. |
| Friday |
Partly sunny, with a high near 78. |
Forecast from NOAA-NWS for St. Louis, MO.