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

Visitors to Eureka can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 5°C (41°F) in the coolest month, January.

Nights vary from 20°C (68°F) in July to around -6°C (21°F) during the colder months.

Check out our detailed temperature page for more information.

Temperature ranges by month

Eureka is known for its substantial rain/snowfall, with annual precipitation reaching 1076 mm (42 in). The climate in Eureka shows significant variation throughout the year. Expect high rainfall in April, the wettest month, with an average of 123 mm (4.8 in) of precipitation over 12 rainy days.

In contrast, the driest month January offers drier and sunnier days, with around 50 mm (2 in) of snow/rainfall over 7 snowy/rainy days. For more details, please visit our Eureka 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, Eureka serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 10.4 hours of sunshine daily, and embrace the darker days in December, offering only 4.3 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 Eureka.

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