Last updated: June 18, 2025
In September, the average temperature in Mississauga, Canada is a pleasant 18°C (64°F), with temperatures ranging from a minimum of 6°C (42°F) to a maximum of 31°C (88°F). Expect some rainfall, as 63 mm (2.5 in) of precipitation typically occurs over 9 days. With an average humidity of 76%, it's a month that beautifully balances warmth and moisture.
In September in Mississauga, the average temperature is 18°C (64°F). The maximum can reach 31°C (88°F), and the minimum can be as low as 6°C (42°F). This range of temperatures makes Mississauga an ideal destination for travelers seeking mild weather and outdoor activities.
In Mississauga in September, the total precipitation amount is 63 mm (2.5 in) spread over a duration of 9 days.
In Mississauga in September, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.
In Mississauga in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Mississauga.
UV Risk Categories
Weather in Mississauga varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Mississauga, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 73 mm (2.9 inches) | 91% | low |
| February Weather | -3°C (27°F) | 80 mm (3.2 inches) | 91% | moderate |
| March Weather | 1°C (34°F) | 64 mm (2.5 inches) | 88% | moderate |
| April Weather | 6°C (43°F) | 110 mm (4.3 inches) | 88% | very high |
| May Weather | 12°C (54°F) | 98 mm (3.9 inches) | 82% | very high |
| June Weather | 18°C (65°F) | 88 mm (3.5 inches) | 79% | very high |
| July Weather | 22°C (72°F) | 75 mm (2.9 inches) | 77% | very high |
| August Weather | 22°C (71°F) | 77 mm (3.0 inches) | 72% | very high |
| September Weather | 18°C (64°F) | 63 mm (2.5 inches) | 76% | high |
| October Weather | 12°C (53°F) | 108 mm (4.3 inches) | 83% | moderate |
| November Weather | 4°C (39°F) | 79 mm (3.1 inches) | 88% | moderate |
| December Weather | 0°C (32°F) | 78 mm (3.1 inches) | 87% | low |