Canada Toronto Weather in September — Climate Guide
September in Toronto is Very Good
September is Very Good for Toronto.
September is Toronto's top season (TIFF + foliage start + shoulder). 12-22°C + 8 sunshine hours + TIFF (Toronto International Film Festival, first Thursday to second Sunday of September, 11 days, celebrities, world's #1 film festival, 300+ films, 600,000+ attendees). Strong Korean + Asian film representation.
Korean Chuseok (mid-late September) airfares spike + TIFF + foliage combo top pick.
Travel score
TIFF (world's #1 film festival) + early foliage + Algonquin start — top combo month
September Weather at a Glance
September averages 72°F / 22°C highs and 54°F / 12°C lows with 8 sunshine hours. 11 rainy days, 75mm rainfall. Lake Ontario water 17°C still swimmable. By month-end, daylight drops below 12.5h. The signature event is TIFF — Toronto International Film Festival (first Thursday to second Sunday of September, 11 days, 300+ films, 600,000+ attendees, world's #1 public film festival). Celebrity sightings citywide. Algonquin Park foliage starts last week.
September Travel Advice
Long-sleeve + cardigan daytime; light jacket evening. TIFF (11 days, early-mid September) drives celebrity crowds at Yorkville hotels (Four Seasons, Hazelton, Park Hyatt are TIFF headquarters). Hotel rates TIFF week +50%. Korean Chuseok (mid-late September) drives Korean inbound. Niagara Falls Hornblower cruise final month — book before October closure transition.
Flying In from Overseas
TIFF brings massive international film industry inbound (Hollywood, London, Cannes, Berlin film community). Korean Chuseok holiday spikes Asia airfares. Direct flights from Seoul CAD 1,400-2,000 (Chuseok week peak), Tokyo CAD 1,300-1,800. LA + NYC film industry charters dominate first 10 days. Western fall travel season begins.
September Pricing Trends
TIFF week (first Thu-second Sun September) hotels +50-100% surge for Yorkville (Four Seasons, Hazelton, Park Hyatt). Korean Chuseok weeks +20-30%. Otherwise: Downtown 4-star CAD 380-650/night (USD 285-485), Yorkville luxury CAD 700-1,300 (USD 520-970), boutique CAD 280-500. Post-TIFF (mid-September onwards) excellent shoulder value.
Toronto September Weather Stats
Avg High
22°C
Avg Low
12°C
Rainy Days
11
75mm total
Sunshine
8h
Daily avg
Humidity
70%
Comfortable
UV Index
6
High
Wind
11 km/h
Gusts 24
Sea Temp
17°C
Swimmable
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
10 μg/m³
PM10
20 μg/m³
Status
Good
Feels-Like Temperature & Wind
Feels like
Daytime
22°C
Nighttime
12°C
Humidity and wind affect how the actual temperature feels.
Wind
11 km/h
Max gust 24 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- TIFF world #1 (300+ films)
- Foliage starts + Algonquin
- Niagara Hornblower final
Cons
- TIFF hotels 1.5x
- Korean Chuseok airfare spike
- Cooling down
September Events & Festivals
- Toronto International Film Festival (TIFF) — first Thursday to second Sunday of September (11 days, celebrities, world's #1 film festival)
- Word on the Street — last weekend of September (book festival)
- Vegandale Festival — first weekend of September (vegan festival)
Toronto in September — Full Picture
September is Toronto's top season (TIFF + foliage start + shoulder). 12-22°C + 8 sunshine hours + TIFF (Toronto International Film Festival, first Thursday to second Sunday of September, 11 days, celebrities, world's #1 film festival, 300+ films, 600,000+ attendees). Strong Korean + Asian film representation.
Korean Chuseok (mid-late September) airfares spike + TIFF + foliage combo top pick.
High Park + Algonquin Park (3-hour drive, Canada's top foliage, peak Sep 25-Oct 15) + Niagara Hornblower final month. Hotels TIFF 1.5x.
What to Wear & What to Pack
Early autumn. Long-sleeve + cardigan. Like mid-September in Korea.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
11°C
2.3°C
12.7/mo
Summer (Jun·Jul·Aug)
25.7°C
15.3°C
10.7/mo
Autumn (Sep·Oct·Nov)
Current14.3°C
6.3°C
11/mo
Winter (Dec·Jan·Feb)
0°C
-6.7°C
11.7/mo
Toronto Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| -1° | -8° | 12d·51mm | 3.5h | 73% | 1 | Quiet | Low season | |
| 0° | -7° | 11d·47mm | 4.5h | 71% | 2 | Quiet | Low season | |
| 4° | -3° | 12d·56mm | 5.5h | 68% | 3 | Quiet | Shoulder | |
| 11° | 2° | 13d·70mm | 7h | 65% | 5 | Moderate | Shoulder | |
| May (Best) | 18° | 8° | 13d·80mm | 8h | 64% | 6 | Moderate | Shoulder |
| June (Best) | 24° | 13° | 11d·75mm | 9.5h | 65% | 8 | Busy | Peak |
| July (Best) | 27° | 17° | 11d·70mm | 10h | 65% | 9 | Very busy | Peak |
| August (Best) | 26° | 16° | 10d·80mm | 9.5h | 67% | 8 | Very busy | Peak |
| September (Best) | 22° | 12° | 11d·75mm | 8h | 70% | 6 | Busy | Peak |
| 14° | 6° | 11d·65mm | 6.5h | 73% | 4 | Moderate | Shoulder | |
| 7° | 1° | 11d·65mm | 4h | 75% | 2 | Quiet | Low season | |
| 1° | -5° | 12d·55mm | 3h | 75% | 1 | Busy | Peak |
View Other Months
Toronto September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Toronto?
Toronto in September is Very Good. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Toronto in September?
Toronto September averages a high of 22°C and a low of 12°C.
Does it rain much in Toronto in September?
Toronto September averages 75mm of rainfall over about 11 rainy days.
What should I wear in Toronto in September?
Early autumn. Long-sleeve + cardigan. Like mid-September in Korea.
What time are sunrise and sunset in Toronto in September?
Toronto September sunrise is 06:55 and sunset is 19:20, with 12h 25m of daylight.
What's the air quality like in Toronto in September?
Toronto September air quality (AQI) averages 32, rated Good. PM2.5 averages 10μg/m³.
What activities are recommended in Toronto in September?
In September, Toronto is great for TIFF film festival, Algonquin foliage start, High Park.
Is September peak season in Toronto?
Toronto September crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Toronto
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.