The highest day temperature in September 2026 was 86°F. The lowest night temperature was 49°F. The average values for day and night temperatures during September were 73.3°F и 60.0°F respectivly.

The average sea surface temperature in September 2026 for Mississauga was 68.3°F. The maximum and minimum values were 66.0°F and 71.6°F respectively.

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation total in September for Mississauga is 0.6 in. This value is relatively stable throughout the year.

The average wind speed in September is 7.1 mph. It makes September one of the most windless months of the year for Mississauga.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Mississauga in September is 7.7 hours.