Wentzville Weather Forecast
- 75
- 94
Mostly Sunny
- 75
- 97
Mostly Sunny
- 75
- 97
Mostly Sunny
- 75
- 97
Hot
- 71
- 95
Chance Thunderstorms
- 67
- 87
Slight Chance Thunderstorms
Today 15 Aug St. Charles
Sunny. Highs in the mid 90s. South Winds around 5 Mph. Heat index Values up to 102.
Tonight 15 Aug St. Charles
Mostly clear. Near steady temperature in the lower 70s. Southeast Winds around 5 Mph.
Wentzville Temperature Statistics
August Temperature
St. Louis, Spirit Of St. Louis Airport (14.9 miles)
Lowest 3 August, 2025
55.7 °FAverage August
76.7 °FHighest 8 August, 2025
94.6 °F
Climate (2020–Present)
St. Louis, Spirit Of St. Louis Airport (14.9 miles)
Average Low 2020–2025
45.9 °FAverage 2020–2025
56.9 °FAverage High 2020–2025
68.1 °F