National Weather Service United States Department of Commerce

Oppressive heat and humidity building into the central and southeast U.S.

A heat wave is building into parts of the central and southeast U.S. this week. The combination of heat and humidity will lead to dangerous heat indices, especially in parts of the central Mississippi River Valley where an Excessive Heat Warning is in effect. Heat Advisories are in effect elsewhere across the region. Relief is not expected for several days.
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Current Conditions

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Saint Louis MO

7 Day Forecast

For More Weather Information:

Saint Louis, MO Local Forecast Office

Today

Hot

Hot

High: 36 °C

Tonight

Mostly Clear

Mostly
Clear

Low: 25 °C

Friday

Hot

Hot

High: 36 °C

Friday
Night

Mostly Clear

Mostly
Clear

Low: 25 °C

Saturday

Hot

Hot

High: 37 °C

Saturday
Night

Mostly Clear

Mostly
Clear

Low: 25 °C

Sunday

Hot

Hot

High: 37 °C

Sunday
Night

Mostly Clear

Mostly
Clear

Low: 24 °C

Monday

Sunny

Sunny

High: 35 °C

Detailed Forecast

  • Today Mostly sunny and hot, with a high near 36. Heat index values as high as 41. Southwest wind 11 to 13 km/h.
  • Tonight Mostly clear, with a low around 25. Southwest wind 11 to 13 km/h.
  • Friday Sunny and hot, with a high near 36. Heat index values as high as 42. Southwest wind 11 to 13 km/h.
  • Friday Night Mostly clear, with a low around 25. Southwest wind 5 to 10 km/h.
  • Saturday Sunny and hot, with a high near 37. West wind 5 to 10 km/h.
  • Saturday Night Mostly clear, with a low around 25.
  • Sunday Sunny and hot, with a high near 37.
  • Sunday Night Mostly clear, with a low around 24.
  • Monday Sunny, with a high near 35.
  • Monday Night Partly cloudy, with a low around 23.
  • Tuesday A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 34.
  • Tuesday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 23.
  • Wednesday A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 32.