Verdict: Excellent month
Banff Weather in September
September hits the sweet spot in Banff — highs around 18°C (64°F), ideal for a full day on foot. Rain is occasional — about 7 wet days in a typical year. Overall, September is one of the best months of the year to be in Banff.
Average high
18°C / 64°F
Average low
4°C / 39°F
Rain days
~7
Precipitation
33 mm
What to pack for Banff in September
- Layers — t-shirts under a light jacket or sweater
- Evenings turn genuinely cool — pack a warm layer for after dark
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Banff: Jul (23°C / 73°F) · Coolest: Jan (-5°C / 23°F) · Wettest: Jun (~13 rain days)
-5°
-14°
Jan
-3°
-14°
Feb
1°
-11°
Mar
6°
-6°
Apr
12°
0°
May
17°
4°
Jun
23°
9°
Jul
22°
8°
Aug
18°
4°
Sep
9°
-2°
Oct
-1°
-11°
Nov
-5°
-14°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)