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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scene Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
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The live forecast above shows Mississauga’s hourly conditions for today. For travellers, the city has four distinct seasons: warm summers (June–August), crisp autumns, cold winters (December–February), and mild springs. Hourly temperatures vary most in spring and fall, when layering is key.
What drives hourly weather changes in Mississauga?
Mississauga’s hourly weather is shaped by its proximity to Lake Ontario, which moderates temperatures and can produce lake-breeze shifts, especially on summer afternoons. Expect cooler near-shore readings and occasional fog in spring. Winter hourly lows often drop below -10°C, while summer highs regularly reach 28°C with humidity.
Best months for predictable hourly weather
For reliable outdoor plans, target July through early September, when daytime temperatures stay in the mid-20s and evening cooling is gradual. March break can bring lingering chill; snowbird returnees should watch for late-winter flurries. The shoulder months (May and October) offer pleasant but changeable hours – pack a windbreaker.
Does Mississauga get lake-effect snow?
Yes, but less than areas east of Lake Ontario. The city can see quick accumulations from westerly flows, especially between December and February. Hourly snow rates vary, so check the live forecast above before travelling.
How humid does it feel in summer?
July and August afternoons often combine heat and humidity, making the humidex climb above 35°C. The hourly forecast above will show humidex values – plan indoor breaks during peak hours.
When is the wettest time of day?
Thunderstorms favour late afternoon and early evening in summer, while winter precipitation is more uniform. Spring showers tend to fall in short bursts. The hourly updates above give a clear picture.
For broader Canadian conditions, visit our Canada weather hub or see Toronto Weather for nearby hourly details. Travel planners should also review weather warnings before setting out. Remember to check weather in Mississauga today, weather in Mississauga tomorrow, and weather Mississauga 14 days for longer-term planning. For finer granularity, use weather in Mississauga 10 days or weather Mississauga 7 days.