Canada in September: Weather, Crowds & What to Expect
Climate Map for September
Average temperature across Canada in September.
City Weather in September
| City | High | Low | Rain | UV | Feels |
|---|---|---|---|---|---|
| Toronto | 21° | 12° | 85 mm | high | Cool |
| Montreal | 21° | 10° | 100 mm | moderate | Cool |
| Calgary | 18° | 4° | 49 mm | moderate | Cool |
| Ottawa | 21° | 10° | 86 mm | moderate | Cool |
| Edmonton | 17° | 5° | 41 mm | moderate | Cool |
| Winnipeg | 19° | 7° | 54 mm | moderate | Cool |
| Mississauga | 22° | 12° | 77 mm | high | Cool |
High / low are average daily temperatures (°C). “Feels” reflects how hot or cold it feels, allowing for humidity.
Pacific Coast (Vancouver Island & Lower Mainland)
September brings cooler evenings and quieter streets after Labour Day; the weather often stays pleasant through the first half of the month with mild days and crisp nights. Fall colours begin in parkland and on the higher slopes of the Coast Mountains; outdoor activities like hiking and cycling are excellent, with fewer crowds. Rain returns gradually later in the month - pack a waterproof layer if you plan fjord or coastal boat trips.
Interior British Columbia & Canadian Rockies (Kelowna, Kamloops, Banff, Jasper)
September cools quickly after Labour Day: valleys enjoy crisp, rewarding days and the first real fall colours appear in aspen stands and larch slopes near Banff and Kananaskis. Crowds thin and rates fall, making it a favorite shoulder season for hiking and scenic drives; the lakes take on clearer visibility once summertime haze eases. Be prepared for sudden temperature swings and early snows at higher elevations late in the month.
The Prairies (Alberta plains, Saskatchewan, Manitoba)
September cools quickly, offering crisp mornings, colourful aspen patches and a welcome drop in summer humidity - an excellent month for cycling and scenic drives. Harvest season means rural traffic and farm machinery on roads; Winnipeg hosts fall fairs and Manitoba’s lake country quiets down after tourists depart. Pack layers for cool evenings and expect markedly fewer bugs compared with midsummer.
Central Canada (Southern Ontario: Toronto, Ottawa, Niagara & Great Lakes)
September cools into pleasant early-autumn weather with crisp mornings and clear, sunny days ideal for the fall colour run around Algonquin and the Ottawa Valley. School returns, crowds thin, and many accommodations lower rates making it an excellent shoulder month. Bring layers for cooler mornings and evenings and expect lively harvest festivals and farmers’ markets across southern Ontario.
Southern Quebec (Montreal, Quebec City, Eastern Townships, Laurentians)
September cools into a very pleasant early-autumn stretch - a favourite time for fall colours in the Eastern Townships and the Laurentians, and for clear, crisp days in Montreal. Crowds thin after Labour Day and hotel rates drop; vineyard tours and apple-picking open up as harvest begins. Pack a warm sweater for evenings and book scenic drives and hikes on weekends for the best colour views.
Atlantic Canada (Nova Scotia, New Brunswick, Prince Edward Island, Newfoundland & Labrador south)
September cools to crisp, pleasant days and is an excellent shoulder month for quieter coastal touring, fall bird migrations and less crowded hiking on trails such as the East Coast Trail. Lobster and harvest festivals continue into the month, and the ocean remains relatively warm for swimming early on. Bring a warm sweater for nights and check schedules for any late-summer storm advisories.
Northern Canada & Arctic (Yukon, Northwest Territories, Nunavut)
September cools rapidly with the return of longer nights and the first signs of sea-ice forming along northern shores; tundra colours turn golden and remote hiking gets dramatic lighting. Bird migrations intensify, and aurora activity resumes with darker nights - an early aurora season can begin later in the month. Prepare for colder nights, shorter days, and reduced logistical options as boat services wind down.