Climate - Isle Of Man (United Kingdom)

Isle Of Man: Temperatures - Precipitation - Sunshine hours - Sea temperatures - Best time - Weather by month


The climate of the Isle of Man is oceanic, cool and humid throughout the year.
The island, a British Crown dependency, is located between Northern Ireland and north-western England.
The average temperature ranges from 6.2 °C (43 °F) in February to 15.5 °C (59.5 °F) in August.
Here are the average temperatures in Ronaldsway Airport.

Precipitation amounts to 865 millimeters (34 inches) per year. It is well distributed over the seasons, and is frequent also in summer. However, the wettest period is from October to January.
On the hills that lie in the interior of the island, precipitation is more abundant, so that at the top of Snaefell, at 621 meters (2,037 feet) above sea level, 1,900 mm (75 in) of rain fall per year (and winter snowfalls are also more frequent).
Here is the average precipitation at the airport.

Winter, from December to February, is quite cold: temperatures are not so low, but wind and humidity can increase the sensation of cold. The sky is often cloudy, and rainfall is frequent. Sometimes, intense Atlantic depressions can cause wind storms.
Snowfalls are relatively rare and not abundant (at least at sea level).
Usually, cold spells are not intense and do not last long. On the coldest nights of the year, the temperature generally drops to -2/-3 °C (27/28 °F), and more rarely to lower values. The coldest record is -9 °C (15.8 °F) and was set in December 1961.

In spring, from March to May, the temperature slowly rises, and Atlantic fronts continue to affect this area more or less as in the rest of the year, although they are a bit less intense than in winter. In May, it is often still quite cold, especially in the first half of the month.

Summer, from June to August, is cool, wet and cloudy, with quite frequent rains. Sunny days, or at least those in which the sky is completely clear from dawn to dusk, are quite rare.
Hot days are rare: the temperature may not reach 25 °C (77 °F) for an entire summer. The highest record is 29 °C (84.2 °F) and was set in July 1983.

Autumn, from September to November, is gray, cloudy and rainy as in the rest of the year, and with each passing week, it gets progressively colder. In November, the wind is often moderate or strong.



The amount of sunshine in the Isle of Man is not good. However, the (relatively) sunniest season is spring, when the sun also shines a little more often than in Ireland or in northern England. Entire days with totally clear skies are rare: it's more likely for the sky to be partly cloudy. On average, there are 1,585 hours of sunshine per year. Here are the average sunshine hours per day.

The Irish Sea is cold all year round, in fact, it reaches at most 15 °C (59 °F) in August. Here are the average sea temperatures.

Best Time

The best time to visit the Isle of Man runs from mid-May to mid-September; May and June are cooler months, but they are relatively sunnier. July and August are the warmest months, or the least cool, however, it's better to bring a jacket, a sweatshirt and a sweater also in midsummer.

Isle of Man - Weather by month

Based on the period 1991-2020

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In January, the weather in Isle of Man is usually quite cold. The average temperature is of 6.5 °C (44 °F), with a minimum of 4.6 °C (40.3 °F) and a maximum of 8.4 °C (47.1 °F).
On the coldest nights of the month, the temperature usually drops to around -1 °C (30 °F). However, it dropped to -5.3 °C (22.5 °F) in January 2010.
On the warmest days of the month, the temperature usually reaches around 11.5 °C (53 °F). However, it reached 13.3 °C (55.9 °F) in January 2003.
Precipitation amounts to 85 mm (3.3 in), distributed over 14 days.
The day lasts on average 8 hours and 0 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 23% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 28 kph (18 mph).
The average sea temperature is of 8.5 °C (47 °F). Therefore, the sea is very cold for swimming.

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In February, the coldest month of the year, the weather in Isle of Man is usually quite cold. The average temperature is of 6.2 °C (43 °F), with a minimum of 4.1 °C (39.4 °F) and a maximum of 8.3 °C (46.9 °F).
On the coldest nights of the month, the temperature usually drops to around -1 °C (30.5 °F). However, it dropped to -3.2 °C (26.2 °F) in February 1994.
On the warmest days of the month, the temperature usually reaches around 11 °C (52 °F). However, it reached 13.2 °C (55.8 °F) in February 2017.
Precipitation amounts to 60 mm (2.4 in), distributed over 11 days.
The day lasts on average 9 hours and 50 minutes.
There are on average 3 hours of sunshine per day. So, the sun shines 28% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 27 kph (17 mph).
The average sea temperature is of 7 °C (45 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Isle of Man is usually quite mild. The average temperature is of 6.9 °C (44 °F), with a minimum of 4.5 °C (40.1 °F) and a maximum of 9.3 °C (48.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -0.5 °C (31.5 °F). However, it dropped to -3.8 °C (25.2 °F) in March 2006.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 12.5 °C (55 °F). However, it reached 17.1 °C (62.8 °F) in March 2012.
Precipitation amounts to 65 mm (2.6 in), distributed over 12 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 31% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 24 kph (15 mph).
The average sea temperature is of 7 °C (45 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Isle of Man is usually mild. The average temperature is of 8.6 °C (47 °F), with a minimum of 5.8 °C (42.4 °F) and a maximum of 11.4 °C (52.5 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 1 °C (34 °F). However, it dropped to -1.4 °C (29.5 °F) in April 2013.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 15.5 °C (60.5 °F). However, it reached 20 °C (68 °F) in April 2003.
Precipitation amounts to 55 mm (2.2 in), distributed over 10 days.
The day lasts on average 14 hours and 10 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 40% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 21 kph (13 mph).
The average sea temperature is of 8 °C (46.5 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Isle of Man is usually mild. The average temperature is of 11.2 °C (52 °F), with a minimum of 8.1 °C (46.6 °F) and a maximum of 14.2 °C (57.6 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 3.5 °C (38 °F). However, it dropped to 0.5 °C (32.9 °F) in May 1996.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 20 °C (68 °F). However, it reached 23.6 °C (74.5 °F) in May 2018.
Precipitation amounts to 50 mm (2 in), distributed over 10 days.
The day lasts on average 16 hours and 5 minutes. So the days are long.
There are on average 7.5 hours of sunshine per day. So, the sun shines 46% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 10 °C (50 °F). Therefore, the sea is very cold for swimming.

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In June, the weather in Isle of Man is usually mild. The average temperature is of 13.6 °C (56 °F), with a minimum of 10.6 °C (51.1 °F) and a maximum of 16.6 °C (61.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 6.5 °C (43.5 °F). However, it dropped to 1.4 °C (34.5 °F) in June 1991.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 22 °C (71.5 °F). However, it reached 27.4 °C (81.3 °F) in June 2018.
Precipitation amounts to 60 mm (2.4 in), distributed over 10 days.
The day lasts on average 17 hours and 5 minutes. So the days are very long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 7 hours of sunshine per day. So, the sun shines 40% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 12 °C (54 °F). Therefore, the sea is very cold for swimming.

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In July, the weather in Isle of Man is usually very mild. The average temperature is of 15.2 °C (59 °F), with a minimum of 12.3 °C (54.1 °F) and a maximum of 18 °C (64.4 °F).
On the coldest nights of the month, the temperature usually drops to around 9 °C (48 °F). However, it dropped to 6.9 °C (44.4 °F) in July 2001.
On the warmest days of the month, the temperature usually reaches around 23 °C (73.5 °F). However, it reached 27.7 °C (81.9 °F) in July 2003.
Precipitation amounts to 55 mm (2.2 in), distributed over 9 days.
The day lasts on average 16 hours and 30 minutes. So the days are long.
There are on average 6.5 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 14 °C (57 °F). Therefore, the sea is very cold for swimming.

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In August, the warmest month of the year, the weather in Isle of Man is usually very mild. The average temperature is of 15.4 °C (60 °F), with a minimum of 12.6 °C (54.7 °F) and a maximum of 18.1 °C (64.6 °F).
On the coldest nights of the month, the temperature usually drops to around 8.5 °C (47 °F). However, it dropped to 6.6 °C (43.9 °F) in August 2014.
On the warmest days of the month, the temperature usually reaches around 21.5 °C (70.5 °F). However, it reached 27.8 °C (82 °F) in August 1995.
Precipitation amounts to 65 mm (2.6 in), distributed over 11 days.
The day lasts on average 14 hours and 50 minutes. So the days are long.
There are on average 6 hours of sunshine per day. So, the sun shines 40% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 15 °C (59 °F). Therefore, the sea is cold for swimming.

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In September, the weather in Isle of Man is usually mild. The average temperature is of 13.8 °C (57 °F), with a minimum of 11.3 °C (52.3 °F) and a maximum of 16.4 °C (61.5 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 6.5 °C (44 °F). However, it dropped to 3.7 °C (38.7 °F) in September 1993.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 19.5 °C (67.5 °F). However, it reached 24.4 °C (75.9 °F) in September 2016.
Precipitation amounts to 75 mm (3 in), distributed over 11 days.
The day lasts on average 12 hours and 35 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 37% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 21 kph (13 mph).
The average sea temperature is of 14.5 °C (58.5 °F). Therefore, the sea is very cold for swimming.

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In October, the weather in Isle of Man is usually mild. The average temperature is of 11.4 °C (53 °F), with a minimum of 9.2 °C (48.6 °F) and a maximum of 13.7 °C (56.7 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 3.5 °C (38.5 °F). However, it dropped to -1.5 °C (29.3 °F) in October 1993.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 17 °C (63 °F). However, it reached 22.7 °C (72.9 °F) in October 2005.
Precipitation amounts to 105 mm (4.1 in), distributed over 14 days.
The day lasts on average 10 hours and 25 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 32% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 25 kph (15 mph).
The average sea temperature is of 13.5 °C (56.5 °F). Therefore, the sea is very cold for swimming.

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In November, the weather in Isle of Man is usually mild. The average temperature is of 9.0 °C (48 °F), with a minimum of 6.9 °C (44.4 °F) and a maximum of 11 °C (51.8 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 0.5 °C (33.5 °F). However, it dropped to -4 °C (24.8 °F) in November 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 14.5 °C (57.5 °F). However, it reached 16.3 °C (61.3 °F) in November 2007.
Precipitation amounts to 105 mm (4.1 in), distributed over 15 days.
The day lasts on average 8 hours and 30 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 25% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 26 kph (16 mph).
The average sea temperature is of 12 °C (53.5 °F). Therefore, the sea is very cold for swimming.

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In December, the weather in Isle of Man is usually quite mild. The average temperature is of 7.0 °C (45 °F), with a minimum of 5 °C (41 °F) and a maximum of 8.9 °C (48 °F).
On the coldest nights of the month, the temperature usually drops to around -1 °C (30.5 °F). However, it dropped to -6.5 °C (20.3 °F) in December 1995.
On the warmest days of the month, the temperature usually reaches around 12.5 °C (54.5 °F). However, it reached 14.3 °C (57.7 °F) in December 2001.
Precipitation amounts to 90 mm (3.5 in), distributed over 14 days.
The day lasts on average 7 hours and 25 minutes. So the days are short. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 1.5 hours of sunshine per day. So, the sun shines 20% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 28 kph (17 mph).
The average sea temperature is of 10 °C (50 °F). Therefore, the sea is very cold for swimming.