NWS Forecast for Wentzville MO

National Weather Service Forecast for: Wentzville MO
Issued by: National Weather Service Saint Louis, MO

Updated: 2:21 am CDT Jun 30, 2026

Today Hot	Tonight Clear	Wednesday Hot	Wednesday Night Clear	Thursday Sunny then Slight Chance T-storms	Thursday Night Slight Chance T-storms	Friday Mostly Sunny	Friday Night Slight Chance T-storms	Independence Day Slight Chance T-storms
Hi 97 °F	Lo 76 °F	Hi 97 °F	Lo 77 °F	Hi 97 °F	Lo 75 °F	Hi 96 °F	Lo 74 °F	Hi 95 °F

Extreme Heat Warning

Today	Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 6 to 9 mph.
Tonight	Clear, with a low around 76. South wind around 6 mph.
Wednesday	Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 3 to 7 mph.
Wednesday Night	Clear, with a low around 77. South wind 3 to 6 mph.
Thursday	A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97. Southwest wind 3 to 6 mph.
Thursday Night	A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75.
Friday	Mostly sunny, with a high near 96.
Friday Night	A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Independence Day	A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Saturday Night	A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday	A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Sunday Night	A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Monday	A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

Forecast from NOAA-NWS for Wentzville MO.