Douglas weather in September

In September, Douglas sees average daytime highs of 15°C and overnight lows near 13°C, with 85 mm of rain across 13.3 wet days and about 12.5 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 15°C through the month. The sky is clear or mostly clear about 18% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of September to 11 h 24 min by month's end. Set against the rest of the year, September is Douglas's 6th-clearest and 7th-windiest month. For the whole year in context, see Douglas's year-round climate.

Daytime high: 15°; 2nd warmest
Overnight low: 13°; 10th coldest
Rainfall: 85 mm; 13.3 wet days
Daylight: 12 h 24 min; 5:59 AM – 6:25 PM
Cloud cover: 68%; 6th clearest
Wind: 28 km/h; 7th windiest
Solar energy: 3.1 kWh/m²
Travel score: 4.1; out of 10

Douglas is capital city of the Isle of Man.

Density: 2,596/km²; people per km²
Founded: 1670

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

← August Douglas 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

Day-to-day highs hold fairly steady near 15°C through the month.

A typical September day in Douglas reaches about 15°C in the afternoon and slips back to 13°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 16°C. Set against its neighbours, September runs on par with August and about 2°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	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	14	14	14	14	14
Avg low (°C)	14	14	14	14	14	14	14	14	14	14	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13

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

Douglas weather by month

How September compares with the rest of the year at a glance. September is the 2nd-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	8° / 6°	97	16.5	0.2	7.7	1.1
Feb	8° / 6°	75	14.2	0.4	9.4	1.0
Mar	8° / 6°	70	12.9	0.5	11.5	1.2
Apr	9° / 7°	59	11.7	0.1	13.7	1.7
May	11° / 9°	56	11.2	0	15.7	2.7
Jun	13° / 12°	64	10.7	0	16.8	3.6
Jul	15° / 14°	67	12.2	0	16.4	4.2
Aug	16° / 14°	78	12.9	0	14.6	4.4
Sep	15° / 13°	85	13.3	0	12.5	4.1
Oct	13° / 11°	117	16.2	0	10.2	3.1
Nov	11° / 9°	125	18.5	0.1	8.2	2.0
Dec	9° / 7°	114	18.2	0.2	7.2	1.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 64%.

	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 (%)	41	40	40	40	39	39	37	37	37	37	36	36	36	35	36	36	36	35	35	35	34	34	33	33	33	34	34	33	33	33
Cloudier (%)	59	60	60	60	61	61	63	63	63	63	64	64	64	65	64	64	64	65	65	65	66	66	67	67	67	66	66	67	67	67

	Clearer (%)	Cloudier (%)
1	41	59
2	40	60
3	40	60
4	40	60
5	39	61
6	39	61
7	37	63
8	37	63
9	37	63
10	37	63
11	36	64
12	36	64
13	36	64
14	35	65
15	36	64
16	36	64
17	36	64
18	35	65
19	35	65
20	35	65
21	34	66
22	34	66
23	33	67
24	33	67
25	33	67
26	34	66
27	34	66
28	33	67
29	33	67
30	33	67

Chance of precipitation in September

Any precipitation

Douglas gets around 85 mm of rain over 13.3 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 44% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

	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 (%)	39	39	40	40	41	42	42	43	43	44	44	44	45	45	45	45	45	44	44	44	45	45	45	46	47	47	48	49	49	50

	Rain chance (%)
1	39
2	39
3	40
4	40
5	41
6	42
7	42
8	43
9	43
10	44
11	44
12	44
13	45
14	45
15	45
16	45
17	45
18	44
19	44
20	44
21	45
22	45
23	45
24	46
25	47
26	47
27	48
28	49
29	49
30	50

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 80% 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 (%)	70	71	71	72	72	73	74	75	76	77	78	79	80	81	81	82	82	82	83	83	84	84	85	85	86	87	87	88	89	89
Comfortable (%)	30	29	29	28	28	27	26	25	24	23	22	21	20	19	19	18	18	18	17	17	16	16	15	15	14	13	13	12	11	11

	Dry (%)	Comfortable (%)
1	70	30
2	71	29
3	71	29
4	72	28
5	72	28
6	73	27
7	74	26
8	75	25
9	76	24
10	77	23
11	78	22
12	79	21
13	80	20
14	81	19
15	81	19
16	82	18
17	82	18
18	82	18
19	83	17
20	83	17
21	84	16
22	84	16
23	85	15
24	85	15
25	86	14
26	87	13
27	87	13
28	88	12
29	89	11
30	89	11

Wind in September

Winds average 28 km/h in September.

Across September, daily wind ranges from about 26 km/h on the calmest days to 30 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)	26	27	27	27	27	27	28	28	28	28	28	28	28	28	29	29	29	29	29	29	29	29	29	29	29	29	29	30	30	30
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	windy	windy	windy	windy	windy	windy

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 30 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 126 minutes over September. Sunrise moves from 5:32 AM to 6:26 AM, and sunset from 7:04 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)	13.5	13.5	13.4	13.3	13.2	13.2	13.1	13.0	12.9	12.9	12.8	12.7	12.7	12.6	12.5	12.4	12.4	12.3	12.2	12.1	12.1	12.0	11.9	11.8	11.8	11.7	11.6	11.5	11.5	11.4
Sunrise (AM)	5:32	5:33	5:35	5:37	5:39	5:41	5:43	5:45	5:46	5:48	5:50	5:52	5:54	5:56	5:58	5:59	6:01	6:03	6:05	6:07	6:09	6:11	6:12	6:14	6:16	6:18	6:20	6:22	6:24	6:26
Sunset (PM)	7:04	7:01	6:59	6:56	6:54	6:51	6:48	6:46	6:43	6:41	6:38	6:35	6:33	6:30	6:28	6:25	6:22	6:20	6:17	6:15	6:12	6:09	6:07	6:04	6:02	5:59	5:57	5:54	5:51	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.5	5:32	7:04
2	13.5	5:33	7:01
3	13.4	5:35	6:59
4	13.3	5:37	6:56
5	13.2	5:39	6:54
6	13.2	5:41	6:51
7	13.1	5:43	6:48
8	13.0	5:45	6:46
9	12.9	5:46	6:43
10	12.9	5:48	6:41
11	12.8	5:50	6:38
12	12.7	5:52	6:35
13	12.7	5:54	6:33
14	12.6	5:56	6:30
15	12.5	5:58	6:28
16	12.4	5:59	6:25
17	12.4	6:01	6:22
18	12.3	6:03	6:20
19	12.2	6:05	6:17
20	12.1	6:07	6:15
21	12.1	6:09	6:12
22	12.0	6:11	6:09
23	11.9	6:12	6:07
24	11.8	6:14	6:04
25	11.8	6:16	6:02
26	11.7	6:18	5:59
27	11.6	6:20	5:57
28	11.5	6:22	5:54
29	11.5	6:24	5:51
30	11.4	6:26	5:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.1 kWh/m².

For context, solar energy here swings from a low near 0.5 kWh/m² to a high of 5.8 kWh/m² in June across the year — September's 3.1 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)	3.8	3.8	3.7	3.7	3.6	3.6	3.5	3.5	3.4	3.4	3.3	3.3	3.2	3.2	3.1	3.1	3.0	3.0	3.0	2.9	2.9	2.8	2.8	2.7	2.6	2.6	2.5	2.5	2.4	2.4
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	3.8	Moderate
2	3.8	Moderate
3	3.7	Moderate
4	3.7	Moderate
5	3.6	Moderate
6	3.6	Moderate
7	3.5	Moderate
8	3.5	Moderate
9	3.4	Moderate
10	3.4	Moderate
11	3.3	Moderate
12	3.3	Moderate
13	3.2	Moderate
14	3.2	Moderate
15	3.1	Moderate
16	3.1	Moderate
17	3.0	Moderate
18	3.0	Moderate
19	3.0	Moderate
20	2.9	Moderate
21	2.9	Moderate
22	2.8	Moderate
23	2.8	Moderate
24	2.7	Moderate
25	2.6	Moderate
26	2.6	Moderate
27	2.5	Moderate
28	2.5	Moderate
29	2.4	Moderate
30	2.4	Moderate

Planning a trip in September

Is September a good time to visit Douglas?

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

4.1

Sightseeing

3rd-best month of the year

—

Beach & pool

never really warm enough

September is a reasonable time to visit Douglas for sightseeing.

What to pack for Douglas in September

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

In September, Douglas sees daytime highs around 15°C and nights near 13°C. Pack a windbreaker. Worth having: a warm layer and rain gear. About 13 days see rain.

a windbreakera warm layerrain gear

Sea temperature near Douglas in September

The nearest coast averages about 15°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 15°C and coldest in March 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)	9	8	8	8	10	12	14	15	15	14	12	10
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	9	Bracing
Feb	8	Bracing
Mar	8	Bracing
Apr	8	Bracing
May	10	Bracing
Jun	12	Bracing
Jul	14	Bracing
Aug	15	Cool
Sep	15	Bracing
Oct	14	Bracing
Nov	12	Bracing
Dec	10	Bracing

UV index in Douglas in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Douglas peaks around August 11 at about 6 (high) — a little sun protection helps at midday. It bottoms out near December 21 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	1	3	3	5	5	5	6	3	2	1	0
Level	Low	Low	Moderate	Moderate	High	High	High	High	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	1	Low
Mar	3	Moderate
Apr	3	Moderate
May	5	High
Jun	5	High
Jul	5	High
Aug	6	High
Sep	3	Moderate
Oct	2	Low
Nov	1	Low
Dec	0	Low

Location & terrain

Where is Douglas?

Douglas sits at 54.1°N, 4.5°W, 31 m above sea level, in Isle of Man. The nearest listed city is Whitehaven, 73 km away.

Topography around Douglas

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

Within 3 km, the terrain around Douglas has only modest variations in elevation — a maximum elevation change of 145 m around an average of 36 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 617 m; within 80 km, large variations in elevation — a maximum elevation change of 613 m.

The land around Douglas is covered by water (40%) and grassland (26%) within 3 km, water (52%) and grassland (36%) within 16 km, and water (88%) within 80 km.

3 km

145 m

water 40%

16 km

617 m

water 52%

80 km

613 m

water 88%

treesgrasslandcroplandartificial surfaceswater

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

September weather nearby: Whitehaven 73 km · Workington 82 km · Barrow in Furness 82 km · Newtownards 92 km · Bangor 95 km · Fleetwood 99 km · Thornton-Cleveleys 100 km · Blackpool 101 km

Isle of Man travel facts

Power plugs: Type G; 230 V · 50 Hz
GDP per capita: $90,015; 2023
Safe drinking water: 100%; of population, 2024
Homicide rate: 1.2; per 100k, 2015
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 Douglas (54.15°, -4.4833°, elevation 31 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	14
2	15	14
3	15	14
4	15	14
5	15	14
6	15	14
7	15	14
8	15	14
9	15	14
10	15	14
11	15	13
12	15	13
13	15	13
14	15	13
15	15	13
16	15	13
17	15	13
18	15	13
19	15	13
20	15	13
21	15	13
22	15	13
23	15	13
24	15	13
25	15	13
26	14	13
27	14	13
28	14	13
29	14	13
30	14	13

	Clearer (%)	Cloudier (%)
1	41	59
2	40	60
3	40	60
4	40	60
5	39	61
6	39	61
7	37	63
8	37	63
9	37	63
10	37	63
11	36	64
12	36	64
13	36	64
14	35	65
15	36	64
16	36	64
17	36	64
18	35	65
19	35	65
20	35	65
21	34	66
22	34	66
23	33	67
24	33	67
25	33	67
26	34	66
27	34	66
28	33	67
29	33	67
30	33	67

	Rain chance (%)
1	39
2	39
3	40
4	40
5	41
6	42
7	42
8	43
9	43
10	44
11	44
12	44
13	45
14	45
15	45
16	45
17	45
18	44
19	44
20	44
21	45
22	45
23	45
24	46
25	47
26	47
27	48
28	49
29	49
30	50

	Dry (%)	Comfortable (%)
1	70	30
2	71	29
3	71	29
4	72	28
5	72	28
6	73	27
7	74	26
8	75	25
9	76	24
10	77	23
11	78	22
12	79	21
13	80	20
14	81	19
15	81	19
16	82	18
17	82	18
18	82	18
19	83	17
20	83	17
21	84	16
22	84	16
23	85	15
24	85	15
25	86	14
26	87	13
27	87	13
28	88	12
29	89	11
30	89	11

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

	Clearer (%)	Cloudier (%)
1	41	59
2	40	60
3	40	60
4	40	60
5	39	61
6	39	61
7	37	63
8	37	63
9	37	63
10	37	63
11	36	64
12	36	64
13	36	64
14	35	65
15	36	64
16	36	64
17	36	64
18	35	65
19	35	65
20	35	65
21	34	66
22	34	66
23	33	67
24	33	67
25	33	67
26	34	66
27	34	66
28	33	67
29	33	67
30	33	67

	Rain chance (%)
1	39
2	39
3	40
4	40
5	41
6	42
7	42
8	43
9	43
10	44
11	44
12	44
13	45
14	45
15	45
16	45
17	45
18	44
19	44
20	44
21	45
22	45
23	45
24	46
25	47
26	47
27	48
28	49
29	49
30	50

	Dry (%)	Comfortable (%)
1	70	30
2	71	29
3	71	29
4	72	28
5	72	28
6	73	27
7	74	26
8	75	25
9	76	24
10	77	23
11	78	22
12	79	21
13	80	20
14	81	19
15	81	19
16	82	18
17	82	18
18	82	18
19	83	17
20	83	17
21	84	16
22	84	16
23	85	15
24	85	15
25	86	14
26	87	13
27	87	13
28	88	12
29	89	11
30	89	11

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

	Clearer (%)	Cloudier (%)
1	41	59
2	40	60
3	40	60
4	40	60
5	39	61
6	39	61
7	37	63
8	37	63
9	37	63
10	37	63
11	36	64
12	36	64
13	36	64
14	35	65
15	36	64
16	36	64
17	36	64
18	35	65
19	35	65
20	35	65
21	34	66
22	34	66
23	33	67
24	33	67
25	33	67
26	34	66
27	34	66
28	33	67
29	33	67
30	33	67

	Rain chance (%)
1	39
2	39
3	40
4	40
5	41
6	42
7	42
8	43
9	43
10	44
11	44
12	44
13	45
14	45
15	45
16	45
17	45
18	44
19	44
20	44
21	45
22	45
23	45
24	46
25	47
26	47
27	48
28	49
29	49
30	50

	Dry (%)	Comfortable (%)
1	70	30
2	71	29
3	71	29
4	72	28
5	72	28
6	73	27
7	74	26
8	75	25
9	76	24
10	77	23
11	78	22
12	79	21
13	80	20
14	81	19
15	81	19
16	82	18
17	82	18
18	82	18
19	83	17
20	83	17
21	84	16
22	84	16
23	85	15
24	85	15
25	86	14
26	87	13
27	87	13
28	88	12
29	89	11
30	89	11