According to the long-range forecast, Ontario is expected to start the season on a cool and dry note, but don't get too comfortable. Rain will, unfortunately, become a recurring theme, with heavy showers and even thunderstorms expected across Ontario and Quebec throughout October. In contrast, southern Ontario might enjoy some of the most temperate days of the entire season, particularly in early October and mid-November. Overall, fall will be a season of dramatic temperature swings, precipitation, and some moments of calm. However, don't worry about the chilly season just yet.