For those searching for an ideal September holiday with excellent weather, Ontario is a perfect choice. Average maximum temperatures are +90°F. Expect about 14 sunny days, making it the perfect place to enjoy the sunshine. It's worth noting that there may be some rainfall, with an average of 7 mm of precipitation over 3 rainy days. So, take your sunglasses, a beach towel, and great walking shoes, as it looks like amazing weather. Search flightsin one click on Avionero.
Average weather
☀️
+90°F
Avg. max. temperature
+50°F
Min.
+115°F
Max.
7 mm
Total precipitation
57%
Avg. humidity
2 m/s
Avg. wind
14 ☀️
Sunny Days
13 ⛅️
Cloudy
3 🌦
Rainy
Our opinion: Ontario has great weather in September.
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Average temperature in Ontario in September
Here are the expected maximum, average and minimum temperatures in Ontario for September based on the historical data.
Last Year
Historical Data
The temperature in September is +84°F on average, with a range between a maximum of +99°F during the day and a minimum of +57°F at night.
The average maximum temperature goes down 43% by the end of the month, compared with the beginning of the month, from +90°F to +72°F.
Is Ontario warm or cold in September?
Ontario is typically hot in September.
Maximum temperatures go down compared to the previous month from +93°F to +90°F. The minimum temperature also goes down from +66°F to +64°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
September is one of the warmest months in Ontario, here is the comparison with other months:
Climate in Ontario in September
Ontario weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+93°F
+90°F
+81°F
Min. temperature
+57°F
+50°F
+45°F
Max. temperature
+111°F
+115°F
+106°F
Rainfall
4 mm
7 mm
18 mm
Wind
2 m/s
2 m/s
1 m/s
Humidity
56%
57%
57%
Air pressure
1011 HPa
1011 HPa
1013 HPa
Sunny days
16
14
12
Cloudy days
13
13
15
Rainy days
1
3
5
Snowy days
0
0
0
September often has better weather than August.It’s getting colder in September. From +93°F in the day, the average maximum temperature lowers to +90°F.Prepare for more rain. Average rainfall goes from 4 mm to 7 mm.Humidity rises from 56% to 57%.The average wind speed doesn’t change much during September, staying around 2 m/s.The days becoming less sunny, going from 16 sunny days in August to 14 in September.
October brings much the same weather, it remains great.
Wind speed in Ontario in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Ontario is gradually increasing during September, going from 3 m/s to 5 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Ontario based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in September stands at 20%, leading to total precipitation of around 32 mm. The maximum amount of rainfall per day is around 13 mm, which is considered light rain.On average, there are about 6 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Ontario wettest month is February, where a typical day has a 32% chance of precipitation and 99 mm of rainfall per day. June, on the other hand, is the driest month with a mere 3% chance of precipitation and 2 mm of rainfall per day.
How was the weather last September in Ontario?
This is the weather in Ontario in September 2024:
1 September
☁️
+89°F
2 September
🌫️
+79°F
3 September
☁️
+80°F
4 September
☁️
+80°F
5 September
☀️
+79°F
6 September
☀️
+86°F
7 September
☀️
+91°F
8 September
☀️
+98°F
9 September
☀️
+96°F
10 September
☁️
+95°F
11 September
☁️
+93°F
12 September
☀️
+88°F
13 September
☀️
+84°F
14 September
☀️
+82°F
15 September
🌫️
+80°F
16 September
🌫️
+79°F
17 September
🌫️
+76°F
18 September
☁️
+80°F
19 September
☀️
+81°F
20 September
☀️
+80°F
21 September
☁️
+73°F
22 September
☁️
+77°F
23 September
☁️
+82°F
24 September
☀️
+85°F
25 September
☀️
+84°F
26 September
☀️
+86°F
27 September
☁️
+87°F
28 September
☀️
+84°F
29 September
🌫️
+78°F
30 September
☁️
+72°F
In September 2024 Ontario had 14 sunny days, 11 cloudy days, and 0 rainy days. The average maximum temperature was +84°F, with an absolute maximum of +99°F and a minimum of +72°F. The average humidity was 68%, with a maximum of 96% and a minimum of 23%. The average wind speed was 3 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Ontario climate has changed over the last 43 years.
The climate in Ontario in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1998 (+74°F) and the highest in 2014 (+82°F). The driest year was 1989 with only 153 mm of rainfall, and the wettest year was 2022 with 1158 mm.
FAQ
Frequently asked questions about the weather in Ontario in September:
Is September a good time to visit Ontario?
Yes, September is a great time to go to Ontario, the weather couldn’t be better. Be ready to get outside, explore and enjoy. Check what other months that are a good time to visit Ontario.
Can you sunbathe in Ontario in September?
Absolutely, September is hot in Ontario. Plan on beach and pool time, and ensure that you pack light and breathable options to stay comfortable.
Is Ontario rainy in September?
Ontario is usually dry in September. Plan your packing around outdoor activities and exploring.
Is it sunny in Ontario in September?
The amount of sunny days in Ontario during September varies; prepare for a mix of clouds and sun.
For this page, we’ve looked at the typical weather in Ontario, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
