Northbrook (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Northbrook.
Climate overview of Northbrook
Northbrook, 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).
With around 1048 mm (41 in) of annual rain/snowfall, Northbrook has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has warm summers and very cold winters. The wettest month is August. The most sunshine falls in July, with an average of 10.6 hours of daily sunshine.
Northbrook Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Northbrook - and find the best time to visit.
Monthly Temperature in Northbrook
Visitors to Northbrook can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 29°C (84°F) in July. In January, the coolest month of the year, temperatures drop to a very cold 0°C (32°F).
At night, temperatures range from around 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 Northbrook
Northbrook is known for its substantial rain/snowfall, with annual precipitation reaching 1048 mm (41 in). Northbrook can be quite wet during August, receiving approximately 117 mm (4.6 in) of precipitation over 11 rainy days.
In contrast, during the driest month (January), you will experience much drier conditions, with 50 mm (2 in) of precipitation spread across 11 snowy days. For more details, please visit our Northbrook 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 Northbrook
Northbrook can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 10.6 hours of sunshine daily. In contrast, the city experiences much darker days in December, 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 Northbrook by Month
The relative humidity is high throughout the year in Northbrook.
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 Northbrook
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 Northbrook
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, July, August and September
- Warmest weather: July and August
- Most sunshine: June and July
- Fewest rainy days: February, March, 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 Northbrook
What is the best time to visit Northbrook?
May, June, July, August and September typically offer the most optimal weather in Northbrook. In contrast, January, February, March, November and December tend to have less optimal conditions. Northbrook has warm summers and very cold winters.
What temperatures can I expect in Northbrook?
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 Northbrook get?
Annual rainfall is around 1048 mm (41 in). August is the wettest month with 117 mm (4.6 in), while January is the driest with 50 mm (2 in).
How sunny is Northbrook?
Northbrook 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, Northbrook enjoys abundant sunshine.
Northbrook 3-Day Forecast
Northbrook (IL) 3-Day Forecast
Northbrook on the map
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