Lake Bluff (IL) Weather & Climate: Best Time to Visit

Visitors to Lake Bluff can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 27°C (81°F) in July. In January, the coolest month of the year, temperatures drop to a very cold -1°C (30°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

Generally, Lake Bluff experiences moderate precipitation patterns, averaging 988 mm (39 in) yearly. Lake Bluff can be quite wet during August, receiving approximately 105 mm (4.1 in) of precipitation over 11 rainy days.

In contrast, during the driest month (January), you will experience much drier conditions, with 44 mm (1.7 in) of precipitation spread across 10 snowy days days. For more details, please visit our Lake Bluff Precipitation page.

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

The average number of days each month with precipitation

Lake Bluff 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

The relative humidity is high throughout the year in Lake Bluff.

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