La Niña will be the major influence, shifting the jet stream upon which weather conditions ride, said AccuWeather Senior Meteorologist Brett Anderson said.
"The jet stream is like a pathway for storms, thus we are expecting a stormier fall, especially across the western half of British Columbia, with above-normal rainfall," he said, bringing an end to dry weather and wildfires.
Communities by the Great Lakes will enjoy warmer temperatures this fall and winter because the water was warmed more than normal this summer.
Anderson said. "this will have its biggest influence on nighttime temperatures, being milder, across the region."
Milder air won't mean "perfect conditions" every day for the entire season, however.
He said shots of cold air could penetrate Ontario and northern Quebec later in the season, while severe thunderstorms from the summer could linger into September.