Banff Weather in September
September in Banff typically sees daytime highs of 12°C (54°F) and nighttime lows of -1°C (30°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Banff in September
Historically, September sees about 10 days of snow/rain, with a monthly average of 69 mm (2.7 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Banff in September
In September, Banff gets moderate temperatures, with highs of 12°C (54°F). Nights cool to around -1°C (30°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights are well below freezing at -1°C (30°F). An extra blanket is a good idea if you feel the cold, especially in older or less well-heated accommodation.
Sunshine in Banff in September
With about 172 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.For Banff itself, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Banff's climate page.
Banff Temperature in September
Min Temperature
-1°C (30°F)
Max Temperature
12°C (54°F)
Chance of Rain
32%
Precipitation
69 mm (2.7 in)
Rainy days
10 days
Humidity
43%
Sunshine
172 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Banff typically drop from around 19°C (66°F) at the start of September to approximately 15°C (59°F) by the end. Nights are cold, with lows typically ranging from 1°C (34°F) to 6°C (43°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Banff in September
Browse day-by-day weather records for Banff spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Banff historical weather extremes in September
According to our 49 years of weather records for Banff, the following extremes were recorded between 1976 and 2025.
- On September 3, 2022, temperatures climbed to 32°C (90°F), marking the warmest September day on record.
- On September 29, 2019, Banff saw its coldest September day with temperatures maxing out at -3°C (27°F).
- Banff registered its coldest September night on September 27, 1984, with temperatures dropping to -11°C (12°F).
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
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What to Wear in Banff in September
Pack for changing conditions in Banff in September. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Rain gear is recommended, you can expect wet weather on multiple days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Banff in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Banff's climate page.
Temperature Rainfall Sunshine Humidity
See the full Banff climate overview or explore weather in Canada.
