Hillside (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Hillside.
Climate overview of Hillside
Hillside, Illinois, United States of America, sees big temperature differences between seasons, with July peaking at 29°C (84°F) and January dropping to 0°C (32°F).
Rain/snowfall is high, totalling around 1053 mm (41 in) per year. August is the wettest month and January the driest. The city also experiences warm summers and very cold winters. The most sunshine falls in July, with an average of 10.6 hours of daily sunshine.
Hillside Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Hillside - and find the best time to visit.
Monthly Temperature in Hillside
Visitors to Hillside can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 29°C (84°F) in July, the warmest time of the year, to a very cold 0°C (32°F) during cooler months like January.
At night, you can expect temperatures ranging from 19°C (66°F) in July to around -8°C (18°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Hillside
Hillside is known for its substantial rain/snowfall, with annual precipitation reaching 1053 mm (41 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, August it receives high rainfall, averaging 125 mm (4.9 in) of precipitation, recorded across 11 rainy days. In contrast, the driest month January brings less snowfall, with 51 mm (2 in) over 11 snowy days. For more details, please visit our Hillside 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 Hillside
Seasonal changes in sunshine hours are quite dramatic in Hillside. 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
Humidity in Hillside by Month
The relative humidity is high throughout the year in Hillside.
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 Hillside
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 Hillside
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September
- Warmest weather: July and August
- Most sunshine: June and July
- Fewest rainy days: February, September and November
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -8°C (18°F).
Frequently asked questions about the climate in Hillside
What is the best time to visit Hillside?
September typically offers the most optimal weather in Hillside. In contrast, January, February, March, November and December tend to have less optimal conditions. Hillside has warm summers and very cold winters.
What temperatures can I expect in Hillside?
Daytime highs range from 0°C (32°F) in January to 29°C (84°F) in July. Nighttime lows range from -8°C (18°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Hillside get?
Annual rainfall is around 1053 mm (41 in). August is the wettest month with 125 mm (4.9 in), while January is the driest with 51 mm (2 in).
How sunny is Hillside?
Hillside 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, Hillside enjoys abundant sunshine.
Hillside 3-Day Forecast
Hillside on the map
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Popular this month
Where to go in August - average daytime high across popular destinations.
Kissimmee
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24°C (75°F) San Francisco22°C (72°F) 
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