Douglas climate

Name: Douglas
Address: IM

Douglas is warmest in August, with average highs of 16 °C, and coldest in February, when nights average 5.1 °C. November is the wettest month (127 mm) and May the driest (58 mm). Figures are 1991–2020 climate normals.

Across a full year Douglas averages 1,033 mm of rain, 0 days above 25 °C and 1 days below freezing.

Isle of Man · population 26,218 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 16 °C
Coldest month February 5.1 °C
Driest month May 58 mm
Wettest month November 127 mm
Least cloud May 61 % cloud
Hottest on record June 26 °C
Coldest on record February -3.9 °C
Warmest sea August 15 °C

What to expectDouglas through the year

Douglas has a clear annual cycle: average daily highs run from 7.5 °C in February to 16 °C in August, a swing of 8.6 °C in mean temperature across the year.

Counted across a normal year, 0 days a year reach 25 °C, 1 nights drop below freezing. The warmest reading in the 1991–2020 record is 26 °C, in June.

Rain is strongly seasonal. November averages 127 mm against 58 mm in May — 2.2 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Douglas is warmest in August at 15 °C and coldest in March at 7.6 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	7.9 °C	98 mm	72 %
February	7.5 °C	80 mm	70 %
March	8.0 °C	73 mm	69 %
April	9.5 °C	61 mm	65 %
May	11.9 °C	58 mm	61 %
June	14.1 °C	68 mm	66 %
July	15.7 °C	69 mm	67 %
August	16.1 °C	82 mm	67 %
September	15.1 °C	87 mm	68 %
October	12.9 °C	118 mm	71 %
November	10.4 °C	127 mm	72 %
December	8.7 °C	115 mm	72 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low
January	7.9 °C	5.5 °C	6.7 °C	12.9 °C	-2.3 °C
February	7.5 °C	5.1 °C	6.3 °C	12.2 °C	-3.9 °C
March	8.0 °C	5.5 °C	6.8 °C	13.6 °C	-3.8 °C
April	9.5 °C	6.9 °C	8.2 °C	18.7 °C	0.9 °C
May	11.9 °C	9.0 °C	10.5 °C	22.2 °C	2.9 °C
June	14.1 °C	11.5 °C	12.8 °C	26.1 °C	5.8 °C
July	15.7 °C	13.2 °C	14.5 °C	24.9 °C	8.6 °C
August	16.1 °C	13.8 °C	14.9 °C	23.6 °C	7.5 °C
September	15.1 °C	12.7 °C	13.9 °C	21.0 °C	3.9 °C
October	12.9 °C	10.7 °C	11.8 °C	17.6 °C	-0.4 °C
November	10.4 °C	8.1 °C	9.3 °C	15.6 °C	-0.4 °C
December	8.7 °C	6.3 °C	7.5 °C	14.2 °C	-3.3 °C

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	98 mm	16	7.9 h/day	72 %	80 %	43 km/h	8.6 °C
February	80 mm	14	9.7 h/day	70 %	79 %	42 km/h	7.7 °C
March	73 mm	13	12 h/day	69 %	80 %	38 km/h	7.6 °C
April	61 mm	12	14 h/day	65 %	80 %	34 km/h	8.4 °C
May	58 mm	11	16 h/day	61 %	80 %	32 km/h	10.1 °C
June	68 mm	11	17 h/day	66 %	83 %	31 km/h	12.2 °C
July	69 mm	12	17 h/day	67 %	84 %	30 km/h	14.0 °C
August	82 mm	13	15 h/day	67 %	84 %	31 km/h	15.0 °C
September	87 mm	13	13 h/day	68 %	81 %	35 km/h	14.9 °C
October	118 mm	16	11 h/day	71 %	79 %	40 km/h	13.7 °C
November	127 mm	18	8.5 h/day	72 %	79 %	42 km/h	11.9 °C
December	115 mm	18	7.4 h/day	72 %	79 %	43 km/h	10.0 °C

How Douglas compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Douglas	16 °C	5.1 °C	1,033 mm	0
Belfast · United Kingdom	18 °C	3.6 °C	913 mm	0
Preston · United Kingdom	19 °C	2.2 °C	1,172 mm	3
Liverpool · United Kingdom	19 °C	2.8 °C	1,072 mm	2

Where Douglas ranks

Ranking	Position	Value
The coolest places in Europe in July	4thof 50	16 °C
The coolest places in Europe in August	6thof 50	16 °C
The coolest places in Europe in June	7thof 50	14 °C
The coolest places in Europe in May	16thof 50	12 °C
The coolest places in the world in May	24thof 50	12 °C
The coolest places in the world in June	30thof 50	14 °C

Planning a trip? See the best time to visit Douglas.

QuestionsCommon questions about Douglas’s climate

When is the best time to visit Douglas?

That depends on what you want, so the honest answer is a comparison rather than a single month. July, August, September sit closest to 20 °C on average, August is the warmest month and May the driest. The month-by-month table above has the full picture.

How hot does Douglas get?

In August, the warmest month, daily highs average 16 °C. The highest value in the 1991–2020 record is 26 °C.

How cold does it get in winter?

Nights average 5.1 °C in February, the coldest month. A normal year has 1 nights below freezing.

Which month is wettest in Douglas?

November, averaging 127 mm over 18 days with rain. The driest month is May with 58 mm. The year as a whole averages 1,033 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Douglas rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.