Banff weather in September

In September, Banff sees average daytime highs of 11°C and overnight lows near -1°C, with 62 mm of precipitation across 10.2 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 8°C by the end. The sky is clear or mostly clear about 31% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Banff's 1st-clearest and 7th-windiest month. For the whole year in context, see Banff's year-round climate.

Daytime high: 11°; 4th warmest
Overnight low: -1°; 9th coldest
Precipitation: 62 mm; 10.2 wet days
Daylight: 12 h 24 min; 6:25 AM – 6:48 PM
Cloud cover: 56%; 1st clearest
Wind: 7 km/h; 7th windiest
Solar energy: 4.16 kWh/m²
Travel score: 2.9; out of 10

Banff is town in Alberta, Canada.

Density: 1,741/km²; people per km²
Founded: 1885

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Banff year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 14°C in the first days to 8°C by the end.

A typical September day in Banff reaches about 11°C in the afternoon and slips back to -1°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 4°C and 19°C. Set against its neighbours, September runs about 5°C cooler than August and about 8°C warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	15	14	14	14	14	13	13	13	13	13	12	12	12	12	12	11	11	11	11	10	10	10	10	10	9	9	9	8	8	8
Avg low (°C)	2	2	1	1	1	1	1	1	1	0	0	0	0	0	0	-1	-1	-1	-1	-1	-2	-2	-2	-2	-2	-3	-3	-3	-3	-4

	Avg high (°C)	Avg low (°C)
1	15	2
2	14	2
3	14	1
4	14	1
5	14	1
6	13	1
7	13	1
8	13	1
9	13	1
10	13	0
11	12	0
12	12	0
13	12	0
14	12	0
15	12	0
16	11	-1
17	11	-1
18	11	-1
19	11	-1
20	10	-1
21	10	-2
22	10	-2
23	10	-2
24	10	-2
25	9	-2
26	9	-3
27	9	-3
28	8	-3
29	8	-3
30	8	-4

How September really feels in Banff

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 30 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is cold — wind chill drags the overnight "feels like" below the raw low.

Banff weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	-10° / -17°	23	6.6	8.1	8.2	0.0
Feb	-8° / -16°	21	5.5	7	9.6	0.0
Mar	-3° / -13°	37	9.5	11.2	11.5	0.0
Apr	2° / -8°	57	10.9	11.4	13.5	0.0
May	7° / -3°	78	12.4	8.7	15.3	0.9
Jun	12° / 1°	119	17.7	3.2	16.2	2.6
Jul	17° / 4°	88	14.9	0.6	15.9	4.9
Aug	17° / 4°	78	12.7	1	14.4	5.1
Sep	11° / -1°	62	10.2	4.9	12.4	2.9
Oct	3° / -8°	40	8.3	7.9	10.4	0.2
Nov	-5° / -14°	35	8	9.4	8.7	0.0
Dec	-11° / -18°	23	6.2	7.5	7.7	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 50%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	50	49	50	48	48	49	49	48	49	49	49	50	50	50	50	50	51	51	51	51	51	50	51	51	51	50	49	49	49	49
Cloudier (%)	50	51	50	52	52	51	51	52	51	51	51	50	50	50	50	50	49	49	49	49	49	50	49	49	49	50	51	51	51	51

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	50	50
4	48	52
5	48	52
6	49	51
7	49	51
8	48	52
9	49	51
10	49	51
11	49	51
12	50	50
13	50	50
14	50	50
15	50	50
16	50	50
17	51	49
18	51	49
19	51	49
20	51	49
21	51	49
22	50	50
23	51	49
24	51	49
25	51	49
26	50	50
27	49	51
28	49	51
29	49	51
30	49	51

Chance of precipitation in September

Any precipitationSnow

Banff gets around 62 mm of rain and snow over 10.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 34% and peaks near 37% on the wettest days, and about 5 days bring snow.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	35	36	36	36	37	37	37	37	36	36	36	36	36	36	35	34	34	33	33	32	32	32	32	32	31	31	31	31	30	30
Snow chance (%)	9	10	11	11	12	12	13	13	14	15	15	16	16	17	17	17	18	18	18	18	18	19	19	20	20	20	21	21	22	22

	Rain chance (%)	Snow chance (%)
1	35	9
2	36	10
3	36	11
4	36	11
5	37	12
6	37	12
7	37	13
8	37	13
9	36	14
10	36	15
11	36	15
12	36	16
13	36	16
14	36	17
15	35	17
16	34	17
17	34	18
18	33	18
19	33	18
20	32	18
21	32	18
22	32	19
23	32	19
24	32	20
25	31	20
26	31	20
27	31	21
28	31	21
29	30	22
30	30	22

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	7	calm
2	7	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	7	calm
9	7	calm
10	7	calm
11	7	calm
12	7	calm
13	7	calm
14	7	calm
15	7	calm
16	7	calm
17	7	calm
18	7	calm
19	7	calm
20	7	calm
21	7	calm
22	7	calm
23	7	calm
24	7	calm
25	7	calm
26	7	calm
27	7	calm
28	7	calm
29	7	calm
30	7	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 24 min at the start of September to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over September. Sunrise moves from 6:01 AM to 6:48 AM, and sunset from 7:23 PM to 6:15 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	13.4	13.3	13.2	13.2	13.1	13.0	13.0	12.9	12.8	12.8	12.7	12.7	12.6	12.5	12.5	12.4	12.3	12.3	12.2	12.1	12.1	12.0	11.9	11.8	11.8	11.7	11.6	11.6	11.5	11.4
Sunrise (AM)	6:01	6:02	6:04	6:06	6:07	6:09	6:10	6:12	6:14	6:15	6:17	6:19	6:20	6:22	6:23	6:25	6:27	6:28	6:30	6:32	6:33	6:35	6:37	6:38	6:40	6:41	6:43	6:45	6:46	6:48
Sunset (PM)	7:23	7:21	7:19	7:16	7:14	7:12	7:09	7:07	7:05	7:02	7:00	6:58	6:55	6:53	6:51	6:48	6:46	6:43	6:41	6:39	6:36	6:34	6:32	6:29	6:27	6:24	6:22	6:20	6:17	6:15

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.4	6:01	7:23
2	13.3	6:02	7:21
3	13.2	6:04	7:19
4	13.2	6:06	7:16
5	13.1	6:07	7:14
6	13.0	6:09	7:12
7	13.0	6:10	7:09
8	12.9	6:12	7:07
9	12.8	6:14	7:05
10	12.8	6:15	7:02
11	12.7	6:17	7:00
12	12.7	6:19	6:58
13	12.6	6:20	6:55
14	12.5	6:22	6:53
15	12.5	6:23	6:51
16	12.4	6:25	6:48
17	12.3	6:27	6:46
18	12.3	6:28	6:43
19	12.2	6:30	6:41
20	12.1	6:32	6:39
21	12.1	6:33	6:36
22	12.0	6:35	6:34
23	11.9	6:37	6:32
24	11.8	6:38	6:29
25	11.8	6:40	6:27
26	11.7	6:41	6:24
27	11.6	6:43	6:22
28	11.6	6:45	6:20
29	11.5	6:46	6:17
30	11.4	6:48	6:15

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.16 kWh/m².

For context, solar energy here swings from a low near 1.11 kWh/m² to a high of 6.57 kWh/m² in May across the year — September's 4.16 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.9	4.8	4.8	4.7	4.7	4.6	4.5	4.5	4.5	4.4	4.4	4.3	4.3	4.2	4.2	4.1	4.1	4.0	4.0	4.0	3.9	3.9	3.8	3.8	3.7	3.7	3.6	3.6	3.5	3.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.9	Bright
2	4.8	Bright
3	4.8	Bright
4	4.7	Bright
5	4.7	Bright
6	4.6	Bright
7	4.5	Bright
8	4.5	Bright
9	4.5	Bright
10	4.4	Bright
11	4.4	Bright
12	4.3	Bright
13	4.3	Bright
14	4.2	Bright
15	4.2	Bright
16	4.1	Bright
17	4.1	Bright
18	4.0	Bright
19	4.0	Bright
20	4.0	Moderate
21	3.9	Moderate
22	3.9	Moderate
23	3.8	Moderate
24	3.8	Moderate
25	3.7	Moderate
26	3.7	Moderate
27	3.6	Moderate
28	3.6	Moderate
29	3.5	Moderate
30	3.5	Moderate

Planning a trip in September

Hazard calendar for Banff

In seasonPeak

In September, Banff sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Banff's rainy season runs April–September, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Banff?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.9

Sightseeing

3rd-best month of the year

0.0

Beach & pool

4th-best month of the year

September is a weaker month for outdoor sightseeing in Banff.

What to pack for Banff in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Banff sees daytime highs around 11°C and nights near -1°C. Pack a warm layer. Worth having: rain gear. About 10 days see rain.

a warm layerrain gear

UV index in Banff in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Banff peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	1	4	5	7	6	9	6	4	3	1	1
Level	Low	Low	Moderate	High	High	High	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	1	Low
Mar	4	Moderate
Apr	5	High
May	7	High
Jun	6	High
Jul	9	Very high
Aug	6	High
Sep	4	Moderate
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Air quality in Banff in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Banff is worst in August — around 64 µg/m³ PM2.5 (unhealthy), about 25.7× the cleanest month (January, 3 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	3	4	5	6	9	8	31	64	14	8	29	3
Level	Good	Good	Good	Good	Good	Good	Moderate	Unhealthy	Moderate	Good	Moderate	Good

	PM2.5 (µg/m³)	Level
Jan	3	Good
Feb	4	Good
Mar	5	Good
Apr	6	Good
May	9	Good
Jun	8	Good
Jul	31	Moderate
Aug	64	Unhealthy
Sep	14	Moderate
Oct	8	Good
Nov	29	Moderate
Dec	3	Good

Location & terrain

Where is Banff?

Banff sits at 51.2°N, 115.6°W, 0 m above sea level, in Canada. The nearest listed city is Canmore, 18 km away.

Topography around Banff

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Banff.

Within 3 km, the terrain around Banff has large variations in elevation — a maximum elevation change of 913 m around an average of 1,513 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,662 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,766 m.

The land around Banff is covered by trees (76%) within 3 km, trees (67%) and bare terrain (26%) within 16 km, and trees (63%) and bare terrain (21%) within 80 km.

3 km

913 m

trees 76%

16 km

1,662 m

trees 67%

80 km

2,766 m

trees 63%

treesgrasslandartificial surfacesbare terrainsnow and icewatermoss and lichen

← August Banff year-round climate October →Best places to visit in September

September weather nearby: Canmore 18 km · Cochrane 77 km · Tuscany 93 km · Edgemont 99 km · Evanston 101 km · Panorama Hills 104 km · Calgary 105 km · Coventry Hills 105 km

Canada travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 83% of US; price level, 2025
GDP per capita: $55,698; 2025
Happiness: 6.7 / 10; World Happiness, 2025
Safe drinking water: 97%; of population, 2024
Homicide rate: 2; per 100k, 2023
Road deaths: 5.3; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Banff (51.1762°, -115.5698°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	15	2
2	14	2
3	14	1
4	14	1
5	14	1
6	13	1
7	13	1
8	13	1
9	13	1
10	13	0
11	12	0
12	12	0
13	12	0
14	12	0
15	12	0
16	11	-1
17	11	-1
18	11	-1
19	11	-1
20	10	-1
21	10	-2
22	10	-2
23	10	-2
24	10	-2
25	9	-2
26	9	-3
27	9	-3
28	8	-3
29	8	-3
30	8	-4

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	50	50
4	48	52
5	48	52
6	49	51
7	49	51
8	48	52
9	49	51
10	49	51
11	49	51
12	50	50
13	50	50
14	50	50
15	50	50
16	50	50
17	51	49
18	51	49
19	51	49
20	51	49
21	51	49
22	50	50
23	51	49
24	51	49
25	51	49
26	50	50
27	49	51
28	49	51
29	49	51
30	49	51

	Rain chance (%)	Snow chance (%)
1	35	9
2	36	10
3	36	11
4	36	11
5	37	12
6	37	12
7	37	13
8	37	13
9	36	14
10	36	15
11	36	15
12	36	16
13	36	16
14	36	17
15	35	17
16	34	17
17	34	18
18	33	18
19	33	18
20	32	18
21	32	18
22	32	19
23	32	19
24	32	20
25	31	20
26	31	20
27	31	21
28	31	21
29	30	22
30	30	22

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	15	2
2	14	2
3	14	1
4	14	1
5	14	1
6	13	1
7	13	1
8	13	1
9	13	1
10	13	0
11	12	0
12	12	0
13	12	0
14	12	0
15	12	0
16	11	-1
17	11	-1
18	11	-1
19	11	-1
20	10	-1
21	10	-2
22	10	-2
23	10	-2
24	10	-2
25	9	-2
26	9	-3
27	9	-3
28	8	-3
29	8	-3
30	8	-4

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	50	50
4	48	52
5	48	52
6	49	51
7	49	51
8	48	52
9	49	51
10	49	51
11	49	51
12	50	50
13	50	50
14	50	50
15	50	50
16	50	50
17	51	49
18	51	49
19	51	49
20	51	49
21	51	49
22	50	50
23	51	49
24	51	49
25	51	49
26	50	50
27	49	51
28	49	51
29	49	51
30	49	51

	Rain chance (%)	Snow chance (%)
1	35	9
2	36	10
3	36	11
4	36	11
5	37	12
6	37	12
7	37	13
8	37	13
9	36	14
10	36	15
11	36	15
12	36	16
13	36	16
14	36	17
15	35	17
16	34	17
17	34	18
18	33	18
19	33	18
20	32	18
21	32	18
22	32	19
23	32	19
24	32	20
25	31	20
26	31	20
27	31	21
28	31	21
29	30	22
30	30	22

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	15	2
2	14	2
3	14	1
4	14	1
5	14	1
6	13	1
7	13	1
8	13	1
9	13	1
10	13	0
11	12	0
12	12	0
13	12	0
14	12	0
15	12	0
16	11	-1
17	11	-1
18	11	-1
19	11	-1
20	10	-1
21	10	-2
22	10	-2
23	10	-2
24	10	-2
25	9	-2
26	9	-3
27	9	-3
28	8	-3
29	8	-3
30	8	-4

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	50	50
4	48	52
5	48	52
6	49	51
7	49	51
8	48	52
9	49	51
10	49	51
11	49	51
12	50	50
13	50	50
14	50	50
15	50	50
16	50	50
17	51	49
18	51	49
19	51	49
20	51	49
21	51	49
22	50	50
23	51	49
24	51	49
25	51	49
26	50	50
27	49	51
28	49	51
29	49	51
30	49	51

	Rain chance (%)	Snow chance (%)
1	35	9
2	36	10
3	36	11
4	36	11
5	37	12
6	37	12
7	37	13
8	37	13
9	36	14
10	36	15
11	36	15
12	36	16
13	36	16
14	36	17
15	35	17
16	34	17
17	34	18
18	33	18
19	33	18
20	32	18
21	32	18
22	32	19
23	32	19
24	32	20
25	31	20
26	31	20
27	31	21
28	31	21
29	30	22
30	30	22

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100