| National Weather Service Forecast for:
St. Louis, MO Issued by: National Weather Service St. Louis/St. Charles, MO |
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| Updated: Fri, 17-Jul-2026 10:41pm CDT | ||||||||||||||||||||||||||||||||||||||||
| Saint Louis | ||||||||||||||||||||||||||||||||||||||||
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Heat Advisory issued July 17 at 11:01AM CDT until July 21 at 7:00PM CDT
| Tonight |
Mostly clear, with a low around 76. West wind around 5 mph. |
| Saturday |
Sunny, with a high near 94. Heat index values as high as 103. West wind 5 to 9 mph. |
| Saturday Night |
A slight chance of showers and thunderstorms between midnight and 1am. Partly cloudy, with a low around 77. Heat index values as high as 102. West wind 2 to 9 mph. Chance of precipitation is 20%. |
| Sunday |
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. Heat index values as high as 105. North wind around 5 mph. Chance of precipitation is 40%. |
| Sunday Night |
A chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 74. East wind 1 to 5 mph. Chance of precipitation is 40%. |
| Monday |
Sunny, with a high near 95. |
| Monday Night |
Mostly clear, with a low around 79. |
| Tuesday |
Sunny, with a high near 97. |
| Tuesday Night |
Mostly clear, with a low around 72. |
| Wednesday |
Sunny, with a high near 87. |
| Wednesday Night |
Mostly clear, with a low around 68. |
| Thursday |
Mostly sunny, with a high near 85. |
| Thursday Night |
Partly cloudy, with a low around 69. |
| Friday |
A slight chance of rain showers between 7am and 1pm. Mostly sunny, with a high near 88. Chance of precipitation is 20%. |
Forecast from NOAA-NWS for St. Louis, MO.