Grain Valley (MO) Weather & Climate: Best Time to Visit

The climate in Grain Valley is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 4°C (39°F) in the coolest month, January.

Nights vary from 21°C (70°F) in July to around -7°C (19°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Grain Valley has a notably wet climate with abundant precipitation, recording 1123 mm (44 in) of rain/snowfall per year. The climate in Grain Valley shows significant variation throughout the year. Expect high rainfall in June, the wettest month, with an average of 153 mm (6 in) of precipitation over 11 rainy days.

In contrast, the driest month January offers drier and sunnier days, with around 24 mm (0.9 in) of snow/rainfall over 6 snowy/rainy days. For more details, please visit our Grain Valley Precipitation page.

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

The average number of days each month with precipitation

For those who appreciate different seasons, Grain Valley serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 11.0 hours of sunshine daily, and embrace the darker days in December, offering only 4.9 hours of daily sunlight.

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 Grain Valley.

The city experiences its highest humidity in December, reaching 70%. In April, the humidity drops to its lowest level at 62%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year