Fort William weather in September

In September, Fort William sees average daytime highs of 14°C and overnight lows near 8°C, with 151 mm of rain across 17 wet days and about 12.5 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 15°C in the first days to 12°C by the end. The sky is clear or mostly clear about 5% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Fort William's 4th-clearest and 8th-windiest month. For the whole year in context, see Fort William's year-round climate.

Daytime high: 14°; 4th warmest
Overnight low: 8°; 9th coldest
Rainfall: 151 mm; 17 wet days
Daylight: 12 h 30 min; 6:01 AM – 6:29 PM
Cloud cover: 83%; 4th clearest
Wind: 11 km/h; 8th windiest
Solar energy: 2.17 kWh/m²
Travel score: 3.1; out of 10

Fort William is town in Highland, Scotland, UK.

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

← August Fort William 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 15°C in the first days to 12°C by the end.

A typical September day in Fort William reaches about 14°C in the afternoon and slips back to 8°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 17°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°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	15	15	15	15	15	15	14	14	14	14	14	14	14	14	14	14	14	13	13	13	13	13	13	13	13	13	13	12	12
Avg low (°C)	9	9	9	9	9	9	8	8	8	8	8	8	8	8	8	8	8	8	8	7	7	7	7	7	7	7	7	7	7	7

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

How September really feels in Fort William

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 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

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Fort William weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	4° / 0°	224	19.5	10.8	7.2	0.0
Feb	5° / 0°	181	17.5	9.8	9.1	0.0
Mar	7° / 1°	166	17.9	7.6	11.4	0.6
Apr	10° / 3°	113	16.4	2.8	13.9	1.7
May	13° / 5°	122	16.9	0.4	16.1	2.8
Jun	15° / 8°	118	17.4	0	17.4	3.4
Jul	16° / 10°	129	19.4	0	16.9	3.7
Aug	16° / 10°	145	19.5	0	14.9	3.7
Sep	14° / 8°	151	17	0	12.5	3.1
Oct	10° / 5°	186	18.9	0.5	10	1.8
Nov	7° / 3°	175	18.7	3.2	7.8	0.7
Dec	5° / 1°	205	18.4	8	6.6	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 87%.

	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 (%)	12	12	12	12	11	11	12	12	12	12	13	14	14	14	15	15	15	15	15	15	14	14	14	14	13	13	12	12	12	12
Cloudier (%)	88	88	88	88	89	89	88	88	88	88	87	86	86	86	85	85	85	85	85	85	86	86	86	86	87	87	88	88	88	88

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	12	88
4	12	88
5	11	89
6	11	89
7	12	88
8	12	88
9	12	88
10	12	88
11	13	87
12	14	86
13	14	86
14	14	86
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	15	85
21	14	86
22	14	86
23	14	86
24	14	86
25	13	87
26	13	87
27	12	88
28	12	88
29	12	88
30	12	88

Chance of precipitation in September

Any precipitation

Fort William gets around 151 mm of rain over 17 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 57% and peaks near 62% on the wettest days.

	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 (%)	57	57	57	57	57	57	57	57	57	57	56	56	56	56	56	56	55	55	55	55	56	56	57	58	59	60	60	61	62	62

	Rain chance (%)
1	57
2	57
3	57
4	57
5	57
6	57
7	57
8	57
9	57
10	57
11	56
12	56
13	56
14	56
15	56
16	56
17	55
18	55
19	55
20	55
21	56
22	56
23	57
24	58
25	59
26	60
27	60
28	61
29	62
30	62

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 97% 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 (%)	94	94	94	94	94	94	95	95	95	96	96	96	97	97	97	97	98	98	98	98	98	98	98	98	98	98	98	98	98	99
Comfortable (%)	6	6	6	6	6	6	5	5	5	4	4	4	3	3	3	3	2	2	2	2	2	2	2	2	2	2	2	2	2	1

	Dry (%)	Comfortable (%)
1	94	6
2	94	6
3	94	6
4	94	6
5	94	6
6	94	6
7	95	5
8	95	5
9	95	5
10	96	4
11	96	4
12	96	4
13	97	3
14	97	3
15	97	3
16	97	3
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	99	1

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 11 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)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11
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	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	calm
7	11	calm
8	11	calm
9	11	calm
10	11	calm
11	11	calm
12	11	calm
13	11	calm
14	11	calm
15	11	calm
16	11	calm
17	11	calm
18	11	calm
19	11	calm
20	11	calm
21	11	calm
22	11	calm
23	11	calm
24	11	calm
25	11	calm
26	11	calm
27	11	calm
28	11	calm
29	11	calm
30	11	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 42 min at the start of September to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 144 minutes over September. Sunrise moves from 5:29 AM to 6:30 AM, and sunset from 7:11 PM to 5:49 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)	13.7	13.6	13.5	13.5	13.4	13.3	13.2	13.1	13.0	13.0	12.9	12.8	12.7	12.6	12.6	12.5	12.4	12.3	12.2	12.1	12.1	12.0	11.9	11.8	11.7	11.7	11.6	11.5	11.4	11.3
Sunrise (AM)	5:29	5:31	5:33	5:36	5:38	5:40	5:42	5:44	5:46	5:48	5:50	5:52	5:54	5:56	5:58	6:01	6:03	6:05	6:07	6:09	6:11	6:13	6:15	6:17	6:19	6:22	6:24	6:26	6:28	6:30
Sunset (PM)	7:11	7:08	7:06	7:03	7:00	6:57	6:54	6:52	6:49	6:46	6:43	6:40	6:37	6:35	6:32	6:29	6:26	6:23	6:20	6:18	6:15	6:12	6:09	6:06	6:03	6:01	5:58	5:55	5:52	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.7	5:29	7:11
2	13.6	5:31	7:08
3	13.5	5:33	7:06
4	13.5	5:36	7:03
5	13.4	5:38	7:00
6	13.3	5:40	6:57
7	13.2	5:42	6:54
8	13.1	5:44	6:52
9	13.0	5:46	6:49
10	13.0	5:48	6:46
11	12.9	5:50	6:43
12	12.8	5:52	6:40
13	12.7	5:54	6:37
14	12.6	5:56	6:35
15	12.6	5:58	6:32
16	12.5	6:01	6:29
17	12.4	6:03	6:26
18	12.3	6:05	6:23
19	12.2	6:07	6:20
20	12.1	6:09	6:18
21	12.1	6:11	6:15
22	12.0	6:13	6:12
23	11.9	6:15	6:09
24	11.8	6:17	6:06
25	11.7	6:19	6:03
26	11.7	6:22	6:01
27	11.6	6:24	5:58
28	11.5	6:26	5:55
29	11.4	6:28	5:52
30	11.3	6:30	5:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.17 kWh/m².

For context, solar energy here swings from a low near 0.29 kWh/m² to a high of 4.43 kWh/m² in May across the year — September's 2.17 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)	2.7	2.6	2.6	2.6	2.5	2.5	2.5	2.4	2.4	2.4	2.3	2.3	2.3	2.3	2.2	2.2	2.1	2.1	2.1	2.0	2.0	2.0	1.9	1.9	1.9	1.8	1.8	1.7	1.7	1.7
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	2.7	Moderate
2	2.6	Moderate
3	2.6	Moderate
4	2.6	Moderate
5	2.5	Moderate
6	2.5	Moderate
7	2.5	Moderate
8	2.4	Moderate
9	2.4	Moderate
10	2.4	Moderate
11	2.3	Moderate
12	2.3	Moderate
13	2.3	Moderate
14	2.3	Moderate
15	2.2	Moderate
16	2.2	Moderate
17	2.1	Moderate
18	2.1	Moderate
19	2.1	Moderate
20	2.0	Moderate
21	2.0	Moderate
22	2.0	Dim
23	1.9	Dim
24	1.9	Dim
25	1.9	Dim
26	1.8	Dim
27	1.8	Dim
28	1.7	Dim
29	1.7	Dim
30	1.7	Dim

Planning a trip in September

Is September a good time to visit Fort William?

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

3.1

Sightseeing

4th-best month of the year

—

Beach & pool

never really warm enough

September is a weaker month for outdoor sightseeing in Fort William.

What to pack for Fort William in September

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

In September, Fort William sees daytime highs around 14°C and nights near 8°C. Pack rain gear. Worth having: a warm layer. About 17 days see rain.

rain geara warm layer

Sea temperature near Fort William in September

The nearest coast averages about 14°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 47 km away) is warmest in August at about 14°C and coldest in February near 8°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	8	8	8	8	10	12	13	14	14	13	11	10
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	8	Bracing
Feb	8	Bracing
Mar	8	Bracing
Apr	8	Bracing
May	10	Bracing
Jun	12	Bracing
Jul	13	Bracing
Aug	14	Bracing
Sep	14	Bracing
Oct	13	Bracing
Nov	11	Bracing
Dec	10	Bracing

UV index in Fort William in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fort William peaks around July 11 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	2	3	5	5	5	4	3	1	1	0
Level	Low	Low	Low	Moderate	Moderate	High	High	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	2	Low
Apr	3	Moderate
May	5	Moderate
Jun	5	High
Jul	5	High
Aug	4	Moderate
Sep	3	Moderate
Oct	1	Low
Nov	1	Low
Dec	0	Low

Location & terrain

Where is Fort William?

Fort William sits at 56.8°N, 5.1°W, 24 m above sea level, in United Kingdom. The nearest listed city is Inverness, 91 km away.

Topography around Fort William

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

Within 3 km, the terrain around Fort William has significant variations in elevation — a maximum elevation change of 521 m around an average of 97 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,341 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,339 m.

The land around Fort William is covered by grassland (48%), trees (23%) and water (21%) within 3 km, grassland (69%) and trees (22%) within 16 km, and grassland (68%) within 80 km.

3 km

521 m

grassland 48%

16 km

1,341 m

grassland 69%

80 km

1,339 m

grassland 68%

treesgrasslandartificial surfacesbare terrainwater

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

September weather nearby: Inverness 91 km · Greenock 99 km · Vale of Leven 100 km · Dumbarton 103 km · Stirling 106 km · Erskine 110 km · Clydebank 111 km · Bearsden 111 km

United Kingdom travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type D / G / M; 230 V · 50 Hz
Prices: ≈ 89% of US; price level, 2025
GDP per capita: $57,602; 2025
Happiness: 6.7 / 10; World Happiness, 2025
Safe drinking water: 100%; of population, 2024
Homicide rate: 1.1; per 100k, 2021
Road deaths: 3.2; 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 Fort William (56.8165°, -5.1121°, elevation 24 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. 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	9
2	15	9
3	15	9
4	15	9
5	15	9
6	15	9
7	15	8
8	14	8
9	14	8
10	14	8
11	14	8
12	14	8
13	14	8
14	14	8
15	14	8
16	14	8
17	14	8
18	14	8
19	13	8
20	13	7
21	13	7
22	13	7
23	13	7
24	13	7
25	13	7
26	13	7
27	13	7
28	13	7
29	12	7
30	12	7

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	12	88
4	12	88
5	11	89
6	11	89
7	12	88
8	12	88
9	12	88
10	12	88
11	13	87
12	14	86
13	14	86
14	14	86
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	15	85
21	14	86
22	14	86
23	14	86
24	14	86
25	13	87
26	13	87
27	12	88
28	12	88
29	12	88
30	12	88

	Rain chance (%)
1	57
2	57
3	57
4	57
5	57
6	57
7	57
8	57
9	57
10	57
11	56
12	56
13	56
14	56
15	56
16	56
17	55
18	55
19	55
20	55
21	56
22	56
23	57
24	58
25	59
26	60
27	60
28	61
29	62
30	62

	Dry (%)	Comfortable (%)
1	94	6
2	94	6
3	94	6
4	94	6
5	94	6
6	94	6
7	95	5
8	95	5
9	95	5
10	96	4
11	96	4
12	96	4
13	97	3
14	97	3
15	97	3
16	97	3
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	99	1

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

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	12	88
4	12	88
5	11	89
6	11	89
7	12	88
8	12	88
9	12	88
10	12	88
11	13	87
12	14	86
13	14	86
14	14	86
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	15	85
21	14	86
22	14	86
23	14	86
24	14	86
25	13	87
26	13	87
27	12	88
28	12	88
29	12	88
30	12	88

	Rain chance (%)
1	57
2	57
3	57
4	57
5	57
6	57
7	57
8	57
9	57
10	57
11	56
12	56
13	56
14	56
15	56
16	56
17	55
18	55
19	55
20	55
21	56
22	56
23	57
24	58
25	59
26	60
27	60
28	61
29	62
30	62

	Dry (%)	Comfortable (%)
1	94	6
2	94	6
3	94	6
4	94	6
5	94	6
6	94	6
7	95	5
8	95	5
9	95	5
10	96	4
11	96	4
12	96	4
13	97	3
14	97	3
15	97	3
16	97	3
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	99	1

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

	Clearer (%)	Cloudier (%)
1	12	88
2	12	88
3	12	88
4	12	88
5	11	89
6	11	89
7	12	88
8	12	88
9	12	88
10	12	88
11	13	87
12	14	86
13	14	86
14	14	86
15	15	85
16	15	85
17	15	85
18	15	85
19	15	85
20	15	85
21	14	86
22	14	86
23	14	86
24	14	86
25	13	87
26	13	87
27	12	88
28	12	88
29	12	88
30	12	88

	Rain chance (%)
1	57
2	57
3	57
4	57
5	57
6	57
7	57
8	57
9	57
10	57
11	56
12	56
13	56
14	56
15	56
16	56
17	55
18	55
19	55
20	55
21	56
22	56
23	57
24	58
25	59
26	60
27	60
28	61
29	62
30	62

	Dry (%)	Comfortable (%)
1	94	6
2	94	6
3	94	6
4	94	6
5	94	6
6	94	6
7	95	5
8	95	5
9	95	5
10	96	4
11	96	4
12	96	4
13	97	3
14	97	3
15	97	3
16	97	3
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	98	2
29	98	2
30	99	1