Zion (IL) Weather & Climate: Best Time to Visit

In Zion, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a comfortable 27°C (81°F) in July, the warmest time of the year, to a very cold -1°C (30°F) during cooler months like February.

At night, you can expect temperatures ranging from 18°C (64°F) in July to around -9°C (16°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

On average, Zion receives a reasonable amount of rain/snowfall, with an annual precipitation of 959 mm (38 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, June it receives high rainfall, averaging 107 mm (4.2 in) of precipitation, recorded across 13 rainy days. In contrast, the driest month January brings less snowfall, with 40 mm (1.6 in) over 10 snowy days. For more details, please visit our Zion Precipitation page.

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

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Zion. While July receives considerable daily sunshine with up to 10.6 hours, December marks the darkest time of the year, where sunshine is scarce with only 3.6 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 Zion.

The city experiences its highest humidity in December, reaching 76%. In May, the humidity drops to its lowest level at 64%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year