| National Weather Service Forecast for:
St. Louis, MO Issued by: National Weather Service St. Louis/St. Charles, MO |
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| Updated: Mon, 20-Jul-2026 9:06am CDT | ||||||||||||||||||||||||||||||||||||||||
| Saint Louis | ||||||||||||||||||||||||||||||||||||||||
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Heat Advisory issued July 20 at 2:10AM CDT until July 21 at 7:00PM CDT
| Today |
Patchy smoke before noon. Sunny, with a high near 94. Heat index values as high as 106. South wind 0 to 5 mph. |
| Tonight |
Mostly clear, with a low around 79. Heat index values as high as 105. Southwest wind around 5 mph. |
| Tuesday |
A slight chance of showers and thunderstorms before 11am. Mostly sunny, with a high near 96. Heat index values as high as 105. West wind 5 to 13 mph. Chance of precipitation is 20%. |
| Tuesday Night |
Mostly clear, with a low around 71. North wind 5 to 13 mph. |
| Wednesday |
Sunny, with a high near 85. North wind around 8 mph. |
| Wednesday Night |
Partly cloudy, with a low around 66. |
| Thursday |
Mostly sunny, with a high near 84. |
| Thursday Night |
A slight chance of rain showers after 1am. Mostly cloudy, with a low around 67. Chance of precipitation is 20%. |
| Friday |
A chance of rain showers before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 81. Chance of precipitation is 30%. |
| Friday Night |
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 30%. |
| Saturday |
A chance of rain showers before 1pm. Mostly sunny, with a high near 89. Chance of precipitation is 30%. |
| Saturday Night |
Mostly clear, with a low around 72. |
| Sunday |
Sunny, with a high near 93. |
| Sunday Night |
Mostly clear, with a low around 74. |
Forecast from NOAA-NWS for St. Louis, MO.