Willowbrook (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Willowbrook.
Climate overview of Willowbrook
Temperatures in Willowbrook, Illinois, United States of America, vary greatly throughout the year. July is the hottest month at 29°C (84°F), while January is the coldest at 0°C (32°F).
The city has a wet climate, receiving around 1078 mm (42 in) of rain/snowfall per year. June is the wettest month. Sunshine peaks in July, when the city sees around 10.6 hours of sunshine per day.
Willowbrook Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Willowbrook — and find the best time to visit.
Monthly Temperature in Willowbrook
The climate in Willowbrook is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold 0°C (32°F) in January.
Nighttime temperatures range from 18°C (64°F) in July to -9°C (16°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Willowbrook
Willowbrook has a notably wet climate with abundant precipitation, recording 1078 mm (42 in) of rain/snowfall per year. The seasons in Willowbrook bring significant changes in precipitation. The wettest month, June, receives high rainfall, with an average of 125 mm (4.9 in) of precipitation. This rainfall is distributed across 15 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 53 mm (2.1 in) over 12 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Willowbrook Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Willowbrook
In Willowbrook, summer days are longer and more sunny, with daily sunshine hours peaking at 10.6 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 3.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Willowbrook by Month
The relative humidity is high throughout the year in Willowbrook.
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
Wind Speed in Willowbrook
The mean wind speed over the year ranges from 4 m/s (8 knots) in June, July, August and September to 6 m/s (12 knots) in January, March and April. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Willowbrook
Frequently asked questions about the climate in Willowbrook
What is the best time to visit Willowbrook?
September typically offers the most optimal weather in Willowbrook. In contrast, January, February, March, November and December tend to have less optimal conditions.
What temperatures can I expect in Willowbrook?
Daytime highs range from 0°C (32°F) in January to 29°C (84°F) in July. Nighttime lows range from -9°C (16°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Willowbrook get?
Annual rainfall is around 1078 mm (42 in). June is the wettest month with 125 mm (4.9 in), while January is the driest with 53 mm (2.1 in).
How sunny is Willowbrook?
Willowbrook receives around 2,509 hours of sunshine per year. July is the sunniest month with 319 hours, while December is the cloudiest with just 107 hours. Overall, Willowbrook enjoys abundant sunshine.
Willowbrook 3-Day Forecast
Willowbrook (IL) 3-Day Forecast
Willowbrook on the map
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