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Mississauga Weather in September
September in Mississauga averages 23°C (73°F) during the day and 13°C (55°F) at night. Quite a bit of rainfall is typical this month, with around 80 mm (3.1 in) on average. An umbrella is a good idea.
Rainfall in Mississauga in September
Based on our climate data of the past 30 years, about 9 days of rain are anticipated, with 80 mm (3.1 in) on average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Mississauga in September
September is a excellent month in Mississauga, with 23°C (73°F) during the day and 13°C (55°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 13°C (55°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Mississauga in September
With approximately 216 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Mississauga Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
23°C (73°F)
Chance of Rain
31%
Precipitation
80 mm (3.1 in)
Rainy days
9 days
Humidity
59%
Sunshine
216 hours
Percentage Sunshine
58%
Mississauga Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mississauga - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mississauga typically drop from around 24°C (75°F) at the start of September to approximately 19°C (66°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 15°C (59°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Mississauga in September
Browse day-by-day weather records for Mississauga spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mississauga historical weather extremes in September
Based on weather observations in Mississauga between 1976 and 2026, these are the recorded extremes during September.
- Mississauga recorded its highest September temperature of 34°C (93°F) on September 7, 2016.
- The lowest daytime temperature in September was 9°C (48°F), recorded on September 28, 2000.
- Mississauga registered its coldest September night on September 27, 1989, with temperatures dropping to -2°C (28°F).
Best Places in Canada in September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Mississauga in September
For Mississauga in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.
What To Do in Mississauga in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Mississauga 3-Day Forecast
More climate data for Mississauga
Temperature Rainfall Sunshine Humidity
See the full Mississauga climate overview or explore weather in Canada.
Popular in September
Where to go in September - average daytime high across popular destinations.
Toronto
22°C (72°F) Niagara Falls23°C (73°F) Montréal
22°C (72°F) Ottawa22°C (72°F) Quebec City
20°C (68°F) Vancouver19°C (66°F) Calgary19°C (66°F) Whistler15°C (59°F) Bucket list
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