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Mississauga's climate is considered moderate. The summer months can bring high temperatures sometimes accompanied by high humidity levels. The average temperature in July and August is 20 C (70 F) but the temperature can soar to 30 C (86 F) and above. A high humidity level can make the temperature appear even warmer still. Winters in Mississauga can be cold, with temperatures most often below the freezing mark. The average temperature in January and February is -6 C (21 F). Colder periods with temperatures as low as -15 C (-4 F) in these months are not uncommon. On the same token brief periods of warmer temperatures also occur on occasion throughout the winter season. The snowfall in Mississauga is relatively low compared with the rest of the province and the rest of Canada.

Mississauga Average Monthly Temperatures