National Weather Service Forecast for: Earth City MO
Issued by: National Weather Service Saint Louis, MO
Updated: 9:01 pm CDT Jun 29, 2026
 
Tonight

Tonight: Mostly clear, with a low around 77. South wind 6 to 8 mph.
Mostly Clear

Tuesday

Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind 5 to 9 mph.
Hot

Tuesday
Night
Tuesday Night: Clear, with a low around 78. South wind 5 to 7 mph.
Clear

Wednesday

Wednesday: Sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind 5 to 7 mph.
Hot

Wednesday
Night
Wednesday Night: Mostly clear, with a low around 79. South wind 5 to 7 mph.
Mostly Clear

Thursday

Thursday: Sunny and hot, with a high near 98.
Hot

Thursday
Night
Thursday Night: A 20 percent chance of showers and thunderstorms before 1am.  Mostly clear, with a low around 78.
Slight Chance
T-storms
Friday

Friday: A 30 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 96.
Sunny then
Chance
T-storms
Friday
Night
Friday Night: Partly cloudy, with a low around 77.
Partly Cloudy

Lo 77 °F Hi 99 °F Lo 78 °F Hi 98 °F Lo 79 °F Hi 98 °F Lo 78 °F Hi 96 °F Lo 77 °F

Extreme Heat Warning
 

Tonight
 
Mostly clear, with a low around 77. South wind 6 to 8 mph.
Tuesday
 
Sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind 5 to 9 mph.
Tuesday Night
 
Clear, with a low around 78. South wind 5 to 7 mph.
Wednesday
 
Sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind 5 to 7 mph.
Wednesday Night
 
Mostly clear, with a low around 79. South wind 5 to 7 mph.
Thursday
 
Sunny and hot, with a high near 98.
Thursday Night
 
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 78.
Friday
 
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.
Friday Night
 
Partly cloudy, with a low around 77.
Independence Day
 
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.
Saturday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Sunday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Sunday Night
 
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Monday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

 

Forecast from NOAA-NWS for Earth City MO.