Summer 2025 Weather Predictions Ontario. The weather network meteorologist nadine powell has your ontario weather outlook for summer 2025.more on canada's 2025 summer forecast: Meanwhile, the prairies are set to face scorching temperatures, occasionally moderated by showers and thunderstorms.
Canadians will experience contrasting weather on thursday, from warmer temperatures in the maritimes to extreme cold in parts of ontario, the prairies and the north. September and october will be cooler than normal, with.