nomadseason

Monthly climate in Port Saint Mary, Isle of Man

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Port Saint Mary features a oceanic climate (Cfb). Temperatures typically range between 7 °C (45 °F) and 15 °C (59 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 19 °C (67 °F). The average annual precipitation amounts to about 1110 mm (43.7 inches) and receives 179 rainy days on the 1 mm (0.04 inches) threshold annually. Port Saint Mary enjoys an average of 3241 hours of sunshine throughout the year, and daylight varies from 7 hours 26 minutes to 17 hours 2 minutes per day.

Monthly average temperatures in Port Saint Mary, Isle of Man

The warmest months in Port Saint Mary are July, August and September, with daily mean temperatures ranging from 14 to 15 °C (58 - 59 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 7 to 8 °C (45 - 46 °F) throughout the day. On average each year, Port Saint Mary experiences 0 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Port Saint Mary. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum13°C
(56°F)		12°C
(54°F)		11°C
(52°F)		13°C
(56°F)		16°C
(60°F)		17°C
(64°F)		19°C
(67°F)		18°C
(65°F)		19°C
(67°F)		17°C
(63°F)		14°C
(58°F)		13°C
(56°F)
Mean maximum11°C
(53°F)		11°C
(52°F)		10°C
(51°F)		12°C
(53°F)		14°C
(58°F)		16°C
(60°F)		18°C
(64°F)		17°C
(63°F)		17°C
(63°F)		16°C
(61°F)		14°C
(57°F)		13°C
(55°F)
Average high9°C
(48°F)		8°C
(47°F)		8°C
(47°F)		9°C
(49°F)		11°C
(52°F)		14°C
(57°F)		15°C
(60°F)		16°C
(61°F)		15°C
(60°F)		13°C
(57°F)		11°C
(52°F)		10°C
(49°F)
Daily mean8°C
(46°F)		7°C
(45°F)		7°C
(45°F)		8°C
(47°F)		10°C
(51°F)		13°C
(55°F)		14°C
(58°F)		15°C
(59°F)		14°C
(58°F)		13°C
(55°F)		10°C
(51°F)		9°C
(48°F)
Average low7°C
(44°F)		6°C
(43°F)		6°C
(44°F)		7°C
(46°F)		10°C
(49°F)		12°C
(54°F)		14°C
(57°F)		14°C
(58°F)		13°C
(56°F)		12°C
(53°F)		9°C
(49°F)		8°C
(46°F)
Mean minimum4°C
(39°F)		3°C
(37°F)		3°C
(38°F)		5°C
(40°F)		7°C
(44°F)		10°C
(51°F)		12°C
(54°F)		13°C
(55°F)		11°C
(52°F)		9°C
(49°F)		6°C
(44°F)		5°C
(41°F)
Minimum3°C
(38°F)		1°C
(34°F)		-1°C
(30°F)		3°C
(38°F)		5°C
(42°F)		9°C
(49°F)		12°C
(53°F)		12°C
(54°F)		10°C
(51°F)		7°C
(45°F)		6°C
(43°F)		4°C
(39°F)

Compare climate in Port Saint Mary with other places

Compare temperature, precipitation, sunshine, UV index in Port Saint Mary, Isle of Man with other places around the world.

Monthly average precipitation in Port Saint Mary, Isle of Man

Port Saint Mary usually has the most precipitation in October, November and December, with an average of 20 rainy days and 143 mm (5.6 inches) of precipitation per month. The driest months in Port Saint Mary are April, May and June. On average, 50 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Port Saint Mary. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)81 (3.2)106 (4.2)87 (3.4)36 (1.4)44 (1.7)70 (2.8)70 (2.8)94 (3.7)91 (3.6)142 (5.6)143 (5.6)144 (5.7)
Average precipitation days (≥ 1 mm)1418188911121514182022

Monthly sunshine hours in Port Saint Mary, Isle of Man

The sunniest months in Port Saint Mary are May, June and July, when the sun shines an average of 13 hours 33 minutes a day. Least sunny months in Port Saint Mary: January, November and December receive an average of 3 hours 32 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Port Saint Mary. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours90161232341418410417375313243131104
Mean daily daylight hours8h 0m9h 46m11h 54m14h 5m16h 1m17h 2m16h 29m14h 45m12h 38m10h 28m8h 30m7h 26m

Solar UV radiation in Port Saint Mary, Isle of Man

Port Saint Mary experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 7 - 8, which corresponds to the High / Very High category of sun exposure. January, February and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Port Saint Mary UV Index data.

Average daily maximum UV levels by month for Port Saint Mary. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)123578875321