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Thornhill Weather in September
Thornhill in September sees high temperatures, with highs around 23°C (73°F) and overnight lows of 12°C (54°F). Rainfall is fairly high at around 79 mm (3.1 in) on average, so pack waterproofs just in case.
Rainfall in Thornhill in September
Historically, September sees about 10 days of rain, with a monthly average of 79 mm (3.1 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Thornhill in September
September is a good time to be in Thornhill. Days are excellent, reaching 23°C (73°F), with nights around 12°C (54°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 12°C (54°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 Thornhill in September
Enjoy a sunny month with about 195 hours of sunshine, the clear skies make Thornhill even more beautiful.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Thornhill.
Thornhill Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
23°C (73°F)
Chance of Rain
32%
Precipitation
79 mm (3.1 in)
Rainy days
10 days
Humidity
87% *
Sunshine
195 hours *
Percentage Sunshine
52% *
* Data from: Toronto, Canada (16 KM, 10 Miles).
Thornhill Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Thornhill - and find the best time to visit.
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 Thornhill in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Thornhill in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Thornhill 3-Day Forecast
More climate data for Thornhill
Temperature Rainfall Sunshine Humidity
See the full Thornhill 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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