Summer 2025 Weather in Ontario and Across Canada: What the Old Farmer’s Almanac Predicts
With spring just underway, eyes are already turning toward Canada’s summer 2025 weather forecast—and early predictions point to a season of heat, humidity, and heavy rainfall, especially in Ontario.
The Old Farmer’s Almanac, known for its long-range forecasts, released its summer outlook for Canada on March 26. Here’s a breakdown of what to expect across the country.
When Does Summer 2025 Start in Canada?
- Meteorological summer begins: June 1, 2025
- Summer solstice (first official day): June 20, 2025
- The season ends on August 31, 2025
Will It Be a Hot Summer in Ontario?
Southern Ontario is expected to see above-average temperatures and frequent thunderstorms. Cities like Toronto, Hamilton, and Windsor could face hot, humid days with stormy weather patterns.
- Thunder Bay to Toronto: Warmer-than-usual conditions
- Northern and Eastern Ontario: Cooler and wetter than average
The Farmers’ Almanac also predicts “sultry” temperatures for Ontario, especially through July and August, alongside frequent thunderstorm activity.
Will It Be a Rainy Summer in Canada?
Yes. Much of the country, including southern Ontario, southern Quebec, and parts of the Prairies, is forecast to get above-normal rainfall. This may help reduce wildfire risks in eastern regions but could cause flash flooding or delays in summer events.
- Southern Ontario: Hot and rainy
- Northern Quebec to Nunavut: Drier than average
- B.C. and Alberta: Warm and dry conditions may lead to wildfire concerns
Summer Heat Across Other Provinces
Here’s a snapshot of conditions across Canada:
British Columbia
- Hot and dry
- Wildfire risk will be elevated, especially in interior and southern regions
Alberta, Saskatchewan, Manitoba
- Scorching temperatures
- Some areas may see record-breaking heat
- Rainfall expected to be near-normal, except drier areas in Alberta
Quebec
- Forecast to be “broiling”
- Rainfall will likely stay around seasonal averages
Atlantic Canada
- Very warm temperatures with normal precipitation
- Possible late-summer storm impacts as hurricane season peaks
Hurricane Activity Later in the Season
As summer progresses into August and September, hurricane season could influence parts of Atlantic Canada, particularly Nova Scotia and Newfoundland.
What Ontario and Canada Can Expect This Summer
| Region | Temperature | Precipitation |
| Southern Ontario | Warmer than average | Above average |
| Northern/Eastern ON | Cooler than average | Rainy |
| British Columbia | Hot and dry | Below average |
| Alberta | Very hot | Dry in parts |
| Quebec | Very warm | Average |
| Atlantic Canada | Very warm | Normal |
| Prairies (SK, MB) | Hot and dry | Average |
If you’re planning a beach day in Ontario, expect hot weather with a higher chance of storms. Western Canada should prepare for heat waves and wildfire risks, while central and eastern areas will see a mix of warmth and wet days.
This summer may not break every record, but it’s shaping up to be one of Canada’s hotter and wetter seasons in recent memory—especially in the east.
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