Bolton (ON) Weather & Climate: Best Time to Visit

The climate in Bolton is known for significant temperature differences throughout the year, making the weather dynamic. 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 15°C (59°F) in July to -10°C (14°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Bolton receives mid-range precipitation levels, with 902 mm (36 in) annually. Despite minor fluctuations, Bolton enjoys fairly consistent precipitation throughout the year. In June, you can expect around 93 mm (3.7 in) of precipitation, while in February, Bolton receives about 59 mm (2.3 in). For more details, please visit our Bolton Precipitation page.

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

The average number of days each month with precipitation

Bolton can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 9.8 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 2.6 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 Bolton.

The city experiences its highest humidity in January, reaching 72%. In May, the humidity drops to its lowest level at 53%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year