How warm is it in Banff in September?

Daytime highs averaged 12.8 °C, night-time lows 1.9 °C. The highest value of the past 10 years was 26.6 °C (3 Sep 2022), the lowest -9.2 °C (30 Sep 2019).

How often does it rain in Banff in September?

On average there were 13.4 rain days (at least 1 mm) with 51.4 mm of precipitation in total.

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Banff weather in September: temperature & rain

Photo: Ethan Sahagun · CC BY-SA 4.0

🇨🇦 Weather in Banff in September

This is what the weather in Banff (Alberta, Canada) was like in September over the years 2017–2026.

Key facts at a glance

Prevailing weather: Light rain

Avg. daytime high

12.8 °C

8.2 °C – 16.5 °C

Avg. night-time low

1.9 °C

-1.0 °C – 5.7 °C

Avg. rain days in period

13.4

45 % of days · ≥ 1.0 mm

Avg. precipitation in period

51.4 mm

26.6 mm – 88.1 mm

Avg. cloud cover

61 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

–

No sea nearby – no sea temperature.

Extremes: Highest temperature 26.6 °C (3 Sep 2022) · Lowest temperature -9.2 °C (30 Sep 2019) · Avg. daily peak wind 9 km/h

Weather mix of all days

41Sunny
69Partly cloudy
41Cloudy
85Light rain
10Rain
39Snow

Summary

On average 12.8 °C during the day and 1.9 °C at night.
On average 13.4 rain days (Rain day = at least 1.0 mm of precipitation) with 51.4 mm of precipitation in total.
Prevailing weather: Light rain.
Warmest year: 2025 (avg. 16.5 °C), coolest: 2018 (avg. 8.2 °C).
Wettest year: 2018 (88.1 mm), driest: 2020 (26.6 mm).
Extremes: 26.6 °C on 3 Sep 2022 and -9.2 °C on 30 Sep 2019.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max12.1°Avg. min1.7°
Rain days
15 Rain days
Precipitation
72.9 mm
Avg. cloud cover
–
Sea temperature
–
Max 18.1 °C · Min -4.1 °C
2025
Avg. max16.5°Avg. min5.7°
Rain days
8 Rain days
Precipitation
31.2 mm
Avg. cloud cover
45 % cloudy
Sea temperature
–
Max 23.9 °C · Min -0.8 °C
2024
Avg. max14.0°Avg. min3.3°
Rain days
17 Rain days
Precipitation
53.0 mm
Avg. cloud cover
54 % cloudy
Sea temperature
–
Max 22.7 °C · Min -4.7 °C
2023
Avg. max12.8°Avg. min1.9°
Rain days
17 Rain days
Precipitation
46.8 mm
Avg. cloud cover
60 % cloudy
Sea temperature
–
Max 20.3 °C · Min -3.4 °C
2022
Avg. max15.5°Avg. min3.4°
Rain days
9 Rain days
Precipitation
35.7 mm
Avg. cloud cover
49 % cloudy
Sea temperature
–
Max 26.6 °C · Min -3.1 °C
2021
Avg. max12.6°Avg. min0.8°
Rain days
10 Rain days
Precipitation
35.7 mm
Avg. cloud cover
67 % cloudy
Sea temperature
–
Max 19.2 °C · Min -4.6 °C
2020
Avg. max13.8°Avg. min2.0°
Rain days
8 Rain days
Precipitation
26.6 mm
Avg. cloud cover
65 % cloudy
Sea temperature
–
Max 20.2 °C · Min -4.7 °C
2019
Avg. max9.5°Avg. min0.7°
Rain days
22 Rain days
Precipitation
75.9 mm
Avg. cloud cover
71 % cloudy
Sea temperature
–
Max 19.0 °C · Min -9.2 °C
2018
Avg. max8.2°Avg. min-1.0°
Rain days
17 Rain days
Precipitation
88.1 mm
Avg. cloud cover
83 % cloudy
Sea temperature
–
Max 18.7 °C · Min -6.8 °C
2017
Avg. max12.6°Avg. min1.0°
Rain days
11 Rain days
Precipitation
47.9 mm
Avg. cloud cover
58 % cloudy
Sea temperature
–
Max 23.5 °C · Min -6.1 °C

Frequently asked questions

How warm is it in Banff in September?: Daytime highs averaged 12.8 °C, night-time lows 1.9 °C. The highest value of the past 10 years was 26.6 °C (3 Sep 2022), the lowest -9.2 °C (30 Sep 2019).
How often does it rain in Banff in September?: On average there were 13.4 rain days (at least 1 mm) with 51.4 mm of precipitation in total.

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)