Ontario (CA) Weather and Climate: A Comprehensive Guide
The climate in Ontario is marked by big temperature swings throughout the year.
Temperatures range from very warm during the warmest months
to pleasant in the cooler months.
The city tends toward drier weather patterns.
Now, let’s explore all the climate details to give you a full picture.
Average maximum day and minimum night temperature
In Ontario, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a very warm 34°C in August. In December, the coolest month of the year, temperatures drop to a pleasant 19°C.
At night, you can expect cooler temperatures, with averages dropping to around 6°C during this month. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Ontario tends toward drier weather patterns, receiving approximately 273 mm of rain per year. Ontario can be quite wet during December, receiving approximately 78 mm of precipitation over 8 rainy days. In contrast June, experiences much drier conditions, with 0.1 mm of rainfall, spread across 0 rainy days. For more details, please visit our Ontario Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Ontario can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 12.3 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 6.6 hours of sunlight per day. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
partly cloudy and no rain broken clouds and no rain clear and no rainForecast for Ontario (CA)
3 m/s
3 m/s
3 m/s
The best time of year to visit Ontario in the United States of America
During the months of January, February, March, April, May and November you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
August has an average maximum temperature of 34°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 19°C.
December tops the wettest month list with 78 mm of rainfall.
June is the driest month with 0 mm of precipitation.
July is the sunniest month with an average of 369 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
