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

Perth, Ontario, Canada, experiences significant temperature variation throughout the year. Summers bring daytime highs of 27°C (81°F) in July, while winters cool to -3°C (27°F) in January.

With around 1007 mm (40 in) of annual rain/snowfall, Perth has a notably wet climate. The wettest month is June. The sunniest month is July, with 9.3 hours of sunshine per day on average.

Monthly Temperature in Perth

Depending on the time of the year, temperatures range from comfortable to very cold in Perth. 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 -3°C (27°F).

At night, temperatures range from around 16°C (61°F) in July to -13°C (9°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Rainfall in Perth

Perth has a relatively rain/snowy climate with high precipitation levels, averaging 1007 mm (40 in) of rain/snowfall annually. Despite minor fluctuations, Perth enjoys fairly consistent precipitation throughout the year. In June, you can expect around 97 mm (3.8 in) of precipitation, while in February, Perth receives about 65 mm (2.6 in). For more details, please visit our Perth 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 Perth

Perth can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 9.3 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 2.8 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Ottawa, Canada (72 KM, 45 Miles).

Daily hours of sunshine

Data from: Ottawa, Canada (72 KM, 45 Miles).

Daily percentage of sunshine

Data from: Ottawa, Canada (72 KM, 45 Miles).

Humidity in Perth by Month

The relative humidity is moderate throughout the year in Perth.

The city experiences its highest humidity in December, reaching 72%. In May, the humidity drops to its lowest level at 49%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

Data from: Ottawa, Canada (72 KM, 45 Miles).

Perth (ON) 3-Day Forecast

10-Day Forecast

Select a Month

Check the conditions for any month of the year.

Best Time to Visit Perth

During the months of May, June, July, August and September, Perth enjoys pleasant weather with average temperatures ranging from 19°C (66°F) to 27°C (80°F). These months are perfect for sightseeing and exploring.

Rainfall during this time ranges from 82 mm (3.2 in) in May to 97 mm (3.8 in) in June. This means you can expect a mix of sunny days and occasional showers.

Planning your next adventure but unsure where to go? Our climate tool suggests perfect locations tailored to your preferred weather conditions. Discover your ideal travel destination with our weather planner.