Ontario's climate is considered continental, with temperatures ranging from humid in the south, with chilly winters and warm summers, to sub-Arctic in the north. Due to Ontario's size, temperatures may vary tremendously from region to region. Temperatures are given officially in degrees Celsius (C) with the Fahrenheit equivalent (F) often added. For an exact conversion, use our conversion tool.
On average, the coldest month of the year is January and the warmest is July. In summer, temperatures can soar above 30 C (86 F), while in winter they can drop to below -13 C (9 F), and often colder in the north.
Visit the Weather Network or Environment Canada for current Ontario weather update and local forecasts.
The Great Lakes Marine Forecast includes marine forecasts (temperatures, wind speeds, wave heights, visibility) along with weather warnings for various regions in Ontario (May - October).
SKI AND SNOW REPORTS
Snow reports and ski/snowboard conditions for major ski resorts in Ontario are available through Ski Ontario from December through to March.