Downers Grove (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Downers Grove.
Climate overview of Downers Grove
Temperatures in Downers Grove, 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 receives considerable rain/snowfall, with around 1084 mm (43 in) annually. June is the wettest month. It has warm summers and very cold winters. Sunshine peaks in July, when the city sees around 10.6 hours of sunshine per day.
Downers Grove Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Downers Grove - and find the best time to visit.
Monthly Temperature in Downers Grove
The climate in Downers Grove is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold 0°C (32°F) in the coolest month, January.
Nights vary from 18°C (64°F) in July to around -9°C (16°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Downers Grove
Downers Grove has a notably wet climate with abundant precipitation, recording 1084 mm (43 in) of rain/snowfall per year. The climate in Downers Grove shows significant variation throughout the year. Expect high rainfall in June, the wettest month, with an average of 130 mm (5.1 in) of precipitation over 14 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 51 mm (2 in) of snowfall over 11 snowy days. For more details, please visit our Downers Grove 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 Downers Grove
For those who appreciate different seasons, Downers Grove serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 10.6 hours of sunshine daily, and embrace the darker days in December, offering only 3.6 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
Humidity in Downers Grove by Month
The relative humidity is high throughout the year in Downers Grove.
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 Downers Grove
The average wind speed over the year ranges from 4 m/s (8 knots) to 6 m/s (12 knots). It is lower in June, July, August and September and higher in January, March and April. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Downers Grove
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, August, September and November
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Downers Grove
What is the best time to visit Downers Grove?
September typically offers the most optimal weather in Downers Grove. In contrast, January, February, March, November and December tend to have less optimal conditions. Downers Grove has warm summers and very cold winters.
What temperatures can I expect in Downers Grove?
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 Downers Grove get?
Annual rainfall is around 1084 mm (43 in). June is the wettest month with 130 mm (5.1 in), while January is the driest with 51 mm (2 in).
How sunny is Downers Grove?
Downers Grove 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, Downers Grove enjoys abundant sunshine.
Downers Grove 3-Day Forecast
Downers Grove (IL) 3-Day Forecast
Downers Grove on the map
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