Canada
Canada in September
Where it is warm, dry and good for swimming in Canada in September — compared across the country’s main destinations.
Quick answers
- Where is it warmest in Canada in September?
- Windsor is the warmest of the 16 destinations compared, with highs of 23°C (73°F) in September; Yellowknife is the coolest at 10°C (50°F).
- Can you swim in the sea in Canada in September?
- Hardly: even the warmest water, at Windsor (20°C (68°F)), stays below 21 °C.
Warmest
23°
Windsor
Coolest
10°
Yellowknife
Driest
29 mm
Victoria
Warmest sea
20°
Windsor
Windsor is the warm end of Canada in September (23°C (73°F)); Yellowknife the cool end (10°C (50°F)). On average it is 5 °C (9 °F) cooler than August. Rain is frequent in most destinations. Best bets this month: Windsor, Osoyoos, and Penticton.
Best places in Canada in September
82 
Windsor
Ontario · Canada
23° / 12° 91 mm Sep
89
Osoyoos
British Columbia · Canada
24° / 9° 17 mm Sep
88
Penticton
British Columbia · Canada
23° / 8° 23 mm Sep
77
Toronto
Ontario · Canada
21° / 12° 85 mm Sep
84
Kelowna
British Columbia · Canada
22° / 8° 30 mm Sep
75
Victoria
British Columbia · Canada
20° / 10° 29 mm Sep
78
Niagara Falls
Ontario · Canada
21° / 12° 94 mm Sep
72
Vancouver
British Columbia · Canada
20° / 11° 65 mm Sep
Weather in September by city
| Place | Day | Night | Rain | Sea | Score |
|---|---|---|---|---|---|
| Windsor | 23° | 12° | 91 mm | 20° | 82 |
| Niagara Falls | 21° | 12° | 94 mm | — | 78 |
| Toronto | 21° | 12° | 85 mm | 19° | 77 |
| Victoria | 20° | 10° | 29 mm | 11° | 75 |
| Kingston | 21° | 11° | 97 mm | 20° | 73 |
| Vancouver | 20° | 11° | 65 mm | 14° | 72 |
| Ottawa | 21° | 10° | 85 mm | — | 71 |
| Winnipeg | 19° | 7° | 53 mm | — | 70 |
| Montreal | 20° | 9° | 98 mm | — | 69 |
| Calgary | 18° | 4° | 50 mm | — | 68 |
| Moncton | 19° | 9° | 88 mm | — | 67 |
| Edmonton | 17° | 5° | 42 mm | — | 60 |
| Québec | 19° | 9° | 123 mm | — | 59 |
| Banff | 16° | 3° | 51 mm | — | 55 |
| St. John's | 17° | 8° | 127 mm | 12° | 49 |
| Yellowknife | 10° | 4° | 31 mm | — | 32 |
Festivals in Canada in September
- Toronto International Film Festival Annual film festival held in Toronto, Canada
- Calgary International Film Festival Film festival
- Pop Montreal Music festival
- Toronto Rock and Roll Revival Music festival held in Toronto, Ontario, Canada
- Cinéfest Sudbury International Film Festival Film festival in Sudbury, Ontario, Canada
- Atlantic International Film Festival Canadian film festival
Public holidays in September
- Labour Day
- National Day for Truth and Reconciliation
Frequently asked questions
What is the weather like in Canada in September?
Average daytime highs range from 10° in Yellowknife to 23° in Windsor.
Can you swim in Canada in September?
The sea is cool: the warmest water is around Windsor at about 20°.