Toronto Weather – Warm, humid, and unsettled — showers and thunderstorms likely through midweek

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September 23, 2025: Toronto’s Detailed Weather ForecastTORONTO – WEATHER – Heading to Toronto for business, pleasure, or a medical appointment? After a muggy start to the day, a system moving through southern Ontario brings showers and the risk of thunderstorms, continuing into Wednesday and Thursday. Today’s Weather OverviewCurrent ConditionsAs of 7:00 AM EDT at Toronto Pearson International Airport, the skies are partly cloudy, with a temperature of 18.4°C and a dew point of 17.3°C. Friday, September 26: A mix of sun and cloud , with a 30% chance of showers . Toronto often sees some of its most humid days in September, especially when southerly winds bring moisture from the Great Lakes and U.S. Midwest.