National Weather Service Forecast for: Wentzville MO
Issued by: National Weather Service Saint Louis, MO
Updated: 2:21 pm CDT Jul 28, 2026
 
Tonight

Tonight: Cloudy during the early evening, then gradual clearing, with a low around 70. East wind 3 to 5 mph.
Gradual
Clearing

 Wednesday

Wednesday: Sunny, with a high near 88. Calm wind becoming east around 6 mph in the afternoon.
Sunny

 Wednesday
Night
Wednesday Night: Clear, with a low around 65. East wind around 6 mph becoming calm in the evening.
Clear

 Thursday

Thursday: Mostly sunny, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon.
Mostly Sunny

 Thursday
Night
Thursday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 68. Light east wind.
Partly Cloudy
then Slight
Chance
Showers
 Friday

Friday: Showers likely, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 85. Chance of precipitation is 70%.
Showers
Likely

 Friday
Night
Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Showers
Likely

 Saturday

Saturday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Chance
Showers

 Saturday
Night
Saturday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.
Slight Chance
T-storms
Lo 70 °F Hi 88 °F Lo 65 °F Hi 88 °F Lo 68 °F Hi 85 °F Lo 68 °F Hi 79 °F Lo 66 °F

Heat Advisory
 

Tonight
 
 Cloudy during the early evening, then gradual clearing, with a low around 70. East wind 3 to 5 mph.
Wednesday
 
 Sunny, with a high near 88. Calm wind becoming east around 6 mph in the afternoon.
Wednesday Night
 
 Clear, with a low around 65. East wind around 6 mph becoming calm in the evening.
Thursday
 
 Mostly sunny, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon.
Thursday Night
 
 A 20 percent chance of showers after 1am. Partly cloudy, with a low around 68. Light east wind.
Friday
 
 Showers likely, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 85. Chance of precipitation is 70%.
Friday Night
 
 Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Saturday
 
 A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 79. Chance of precipitation is 50%.
Saturday Night
 
 A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 20%.
Sunday
 
 A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
Sunday Night
 
 Partly cloudy, with a low around 66.
Monday
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 86.
Monday Night
 
 Mostly clear, with a low around 68.
Tuesday
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 89.

 

Forecast from NOAA-NWS for Wentzville MO.