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Bolton (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Bolton.
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Climate overview of Bolton
Temperatures in Bolton, Ontario, Canada, vary greatly throughout the year. July is the hottest month at 27°C (81°F), while January is the coldest at -1°C (30°F).
Annual rain/snowfall is moderate at around 902 mm (36 in), with June being the wettest month. The city also has warm summers and very cold winters. Sunshine peaks in July, when the city sees around 9.8 hours of sunshine per day.
Bolton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Bolton - and find the best time to visit.
Monthly Temperature in Bolton
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
Rainfall in Bolton
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
Sunshine Hours in Bolton
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
Data from: Mississauga, Canada (33 KM, 20 Miles).
Daily hours of sunshine
Data from: Mississauga, Canada (33 KM, 20 Miles).
Daily percentage of sunshine
Data from: Mississauga, Canada (33 KM, 20 Miles).
Humidity in Bolton by Month
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
Data from: Mississauga, Canada (33 KM, 20 Miles).
Best Time to Visit Bolton
The most comfortable overall weather for exploring Bolton is usually found in May, June, July, August and September. Conditions are generally least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
cold
Mar
cold
Apr
mixed
May
excellent
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
good
Nov
cold
Dec
cold
- Best overall: May, June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -10°C (14°F).
Frequently asked questions about the climate in Bolton
What is the best time to visit Bolton?
May, June, July, August and September typically offer the most optimal weather in Bolton. In contrast, January, February, March, November and December tend to have less optimal conditions. Bolton has warm summers and very cold winters.
What temperatures can I expect in Bolton?
Daytime highs range from -1°C (30°F) in January to 27°C (81°F) in July. Nighttime lows range from -10°C (14°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Bolton get?
Annual rainfall is around 902 mm (36 in). June is the wettest month with 93 mm (3.7 in), while February is the driest with 59 mm (2.3 in).
How sunny is Bolton?
Bolton receives around 2,184 hours of sunshine per year. July is the sunniest month with 295 hours, while January is the cloudiest with just 78 hours. Overall, Bolton enjoys abundant sunshine.
Bolton 3-Day Forecast
Bolton on the map
Bolton is highlighted - select any city to see its climate.
Popular in September
Where to go in September - average daytime high across popular destinations.
Toronto
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22°C (72°F) Ottawa22°C (72°F) Quebec City
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