Wentzville (MO) Weather & Climate: Best Time to Visit

Visitors to Wentzville can expect significant temperature changes throughout the year. Average daytime temperatures reach a very warm 31°C (88°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 5°C (41°F).

At night, temperatures range from around 20°C (68°F) in July to -6°C (21°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Wentzville is known for its substantial rain/snowfall, with annual precipitation reaching 1106 mm (44 in). Wentzville can be quite wet during May, receiving approximately 125 mm (4.9 in) of precipitation over 15 rainy days.

In contrast, during the driest month (January), you will experience much drier conditions, with 44 mm (1.7 in) of precipitation spread across 7 snowy/rainy days. For more details, please visit our Wentzville Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Wentzville can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.4 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 4.3 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Wentzville.

The city experiences its highest humidity in December, reaching 74%. In April, the humidity drops to its lowest level at 63%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year