September weather forecastMississauga, Canada
September
Weather in September
As September rolls in, it heralds the advent of fall in Mississauga, demonstrating a decrease in average temperature highs to 21.5°C (70.7°F). The lush greenery begins to change color, providing a picturesque cityscape scattered with hues of yellow, orange, and red. Despite still warm days, the evenings begin to cool, providing a balancing contrast. The sea temperature begins to decline, signaling the closure of the beach season. The fading summer warmth and onset of crisp fall air create a comfortable ambiance for outdoor excursions.Temperature
With the onset of September, Mississauga's average high-temperature slightly adjusts, moderately receding from August's warm 24.6°C (76.3°F) to a pleasant 21.5°C (70.7°F). In September, Mississauga reports a consistent average low-temperature of 15.5°C (59.9°F) during the nights.Humidity
With an average relative humidity of 74%, September is the least humid month in Mississauga.Rainfall
September and November are months with the least rain when the rain falls for 15.1 days and typically aggregates up to 55mm (2.17") of rain.Snowfall
June through September are months without snowfall.Sea temperature
In Mississauga, the average seawater temperature in September is 20.2°C (68.4°F).Note: In water with a temperature of 20.2°C (68.4°F), most individuals do not find swimming enjoyable. As the temperature falls from 21°C (69.8°F) to 15°C (59°F), breathing control becomes more difficult.
Daylight
In Mississauga, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:15 am and sunset at 7:00 pm EDT.
Sunshine
In Mississauga, the average sunshine in September is 9.4h.UV index
In Mississauga, Canada, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mississauga, Canada
- Average high temperature in September: 21.5°C
The warmest month (with the highest average high temperature) is July (24.8°C).
The month with the lowest average high temperature is January (-1.4°C).
- Average low temperature in September: 15.5°C
The month with the highest average low temperature is July (18.6°C).
The coldest month (with the lowest average low temperature) is January (-6.1°C).
Average pressure in September
Mississauga, Canada
- Average pressure in September: 1017.2mbar
The month with the highest atmospheric pressure is November (1018.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).
Average wind speed in September
Mississauga, Canada
- Average wind speed in September: 14.1km/h
The windiest month (with the highest average wind speed) is January (21km/h).
The calmest month (with the lowest average wind speed) is July (12.1km/h).
Average humidity in September
Mississauga, Canada
- Average humidity in September: 74%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is September (74%).
Average rainfall in September
Mississauga, Canada
- Average rainfall in September: 55mm
The wettest month (with the highest rainfall) is July (80mm).
The driest months (with the least rainfall) are September and November (55mm).
Average rainfall days in September
Mississauga, Canada
- Average rainfall days in September: 15.1 days
The month with the highest number of rainy days is October (18.9 days).
The month with the least rainy days is February (8.8 days).
Average snowfall in September
Mississauga, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (127mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Mississauga, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (14.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Mississauga, Canada
- Average sea temperature in September: 20.2°C
The best month for swimming (with the highest average sea temperature) is August (22.3°C).
The coldest months (with the lowest average sea temperature) are February and March (1.4°C).
Average daylight in September /
Average sunshine in September
Mississauga, Canada
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 24min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in September
Mississauga, Canada
- Average sunshine days in September: 13 days
The month with the most sunshine days is September (13 days).
The month with the least sunshine days is January (7.5 days).
Average UV index in September
Mississauga, Canada
- Average UV index in September: 4
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Mississauga, Canada
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Mississauga, Canada
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January and February (8km).
