Climate - Dublin (Ireland)

The climate of Dublin, the capital of the Republic of Ireland, is oceanic, cool and humid throughout the year.
The city is located on the east coast of Ireland.
The average temperature ranges from around 5 °C (41 °F) in January and February to around 15 °C (59 °F) in July and August. Here are the average temperatures.

Precipitation amounts to 750 millimeters (30 inches) per year. The city is located in the least rainy part of the island of Ireland, since part of the moisture coming from the ocean is released on the west side as rain, but the rains are frequent also in Dublin, although they are typically not abundant. In addition, they are well distributed over the seasons, and are frequent also in summer.
Here is the average precipitation.

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. Usually, cold spells are not intense and do not last long. On the coldest nights of the year, the temperature normally drops to around -5 °C (23 °F), however, it occasionally drops to lower values.
In the exceptional month of December 2010, it often snowed and the temperature dropped to -12 °C (10 °F). At the Casement Aerodrome, located on the western outskirts of the city and therefore at a greater distance from the sea, the temperature dropped to -15.4 °C (4.3 °F).

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, and in any case it almost never reaches 30 °C (86 °F). In August 1990, the temperature reached 28.7 °C (83.7 °F) at the airport, while within the city it reached 31 °C (88 °F) in Glasnevin and 30 °C (86 °F) in Merrion Square.

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 Dublin is not good. However, the (relatively) sunniest season is spring. Entire days with totally clear skies are rare: it's more likely for the sky to be partly cloudy. On average, there are 1,450 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 15/16 °C (59/61 °F) in the summer months. Here are the average sea temperatures.

Best Time

The best time to visit Dublin is the summer, from June to August, since it is the mildest of the year. 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.

Dublin - Weather by month

Based on the period 1991-2020

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In January, the coldest month of the year, the weather in Dublin is usually quite cold. The average temperature is of 5.3 °C (41 °F), with a minimum of 2.3 °C (36.2 °F) and a maximum of 8.2 °C (46.7 °F).
On the coldest nights of the month, the temperature usually drops to around -4 °C (25 °F). However, it dropped to -9.5 °C (14.9 °F) in January 2010.
On the warmest days of the month, the temperature usually reaches around 13 °C (55.5 °F). However, it reached 16.2 °C (61.2 °F) in January 1998.
Precipitation amounts to 65 mm (2.6 in), distributed over 13 days.
The day lasts on average 8 hours and 10 minutes.
There are on average 2 hours of sunshine per day. So, the sun shines 23% of the time.
The average humidity is 86%. Hence, the air is normally humid.
The average wind speed is 22 kph (14 mph).
The average sea temperature is of 9 °C (48 °F). Therefore, the sea is very cold for swimming.

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In February, the weather in Dublin is usually quite cold. The average temperature is of 5.4 °C (42 °F), with a minimum of 2.1 °C (35.8 °F) and a maximum of 8.6 °C (47.5 °F).
On the coldest nights of the month, the temperature usually drops to around -3.5 °C (25.5 °F). However, it dropped to -7.9 °C (17.8 °F) in February 2015.
On the warmest days of the month, the temperature usually reaches around 13 °C (56 °F). However, it reached 17.3 °C (63.1 °F) in February 1998.
Precipitation amounts to 50 mm (2 in), distributed over 10 days.
The day lasts on average 9 hours and 55 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 27% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 22 kph (13 mph).
The average sea temperature is of 8 °C (46 °F). Therefore, the sea is very cold for swimming.

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In March, the weather in Dublin is usually quite cold. The average temperature is of 6.4 °C (44 °F), with a minimum of 2.7 °C (36.8 °F) and a maximum of 10.2 °C (50.4 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -3 °C (26.5 °F). However, it dropped to -7.9 °C (17.8 °F) in March 2001.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 15.5 °C (59.5 °F). However, it reached 18.9 °C (66 °F) in March 1999.
Precipitation amounts to 55 mm (2.2 in), distributed over 11 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 29% of the time.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is 21 kph (13 mph).
The average sea temperature is of 7.5 °C (46 °F). Therefore, the sea is very cold for swimming.

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In April, the weather in Dublin is usually quite mild. The average temperature is of 8.1 °C (47 °F), with a minimum of 3.9 °C (39 °F) and a maximum of 12.3 °C (54.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -1.5 °C (29 °F). However, it dropped to -5.6 °C (21.9 °F) in April 2013.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 18 °C (64 °F). However, it reached 22.2 °C (72 °F) in April 2003.
Precipitation amounts to 55 mm (2.2 in), distributed over 11 days.
The day lasts on average 14 hours and 5 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 38% of the time.
The average humidity is 80%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 8.5 °C (47.5 °F). Therefore, the sea is very cold for swimming.

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In May, the weather in Dublin is usually mild. The average temperature is of 10.7 °C (51 °F), with a minimum of 6.4 °C (43.6 °F) and a maximum of 15 °C (59.1 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 0.5 °C (33 °F). However, it dropped to -2.9 °C (26.8 °F) in May 2012.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 21 °C (70 °F). However, it reached 24 °C (75.2 °F) in May 1998.
Precipitation amounts to 60 mm (2.4 in), distributed over 11 days.
The day lasts on average 16 hours and 0 minutes. So the days are long.
There are on average 6 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 18 kph (11 mph).
The average sea temperature is of 10.5 °C (51 °F). Therefore, the sea is very cold for swimming.

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In June, the weather in Dublin is usually mild. The average temperature is of 13.4 °C (56 °F), with a minimum of 9 °C (48.2 °F) and a maximum of 17.7 °C (63.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4 °C (39 °F). However, it dropped to 0.7 °C (33.3 °F) in June 2015.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23.5 °C (74.5 °F). However, it reached 26.8 °C (80.2 °F) in June 1996.
Precipitation amounts to 65 mm (2.6 in), distributed over 10 days.
The day lasts on average 16 hours and 55 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 6 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 17 kph (10 mph).
The average sea temperature is of 13 °C (55 °F). Therefore, the sea is very cold for swimming.

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In July, the warmest month of the year, the weather in Dublin is usually very mild. The average temperature is of 15.2 °C (59 °F), with a minimum of 11 °C (51.9 °F) and a maximum of 19.4 °C (66.9 °F).
On the coldest nights of the month, the temperature usually drops to around 6.5 °C (43.5 °F). However, it dropped to 3.9 °C (39 °F) in July 2015.
On the warmest days of the month, the temperature usually reaches around 24.5 °C (76 °F). However, it reached 28.1 °C (82.6 °F) in July 1995.
Precipitation amounts to 55 mm (2.2 in), distributed over 11 days.
The day lasts on average 16 hours and 25 minutes. So the days are long.
There are on average 5.5 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 16 kph (10 mph).
The average sea temperature is of 15 °C (58.5 °F). Therefore, the sea is cold for swimming.

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In August, the weather in Dublin is usually very mild. The average temperature is of 15.0 °C (59 °F), with a minimum of 10.9 °C (51.6 °F) and a maximum of 19.1 °C (66.4 °F).
On the coldest nights of the month, the temperature usually drops to around 6 °C (42.5 °F). However, it dropped to 2.5 °C (36.5 °F) in August 2010.
On the warmest days of the month, the temperature usually reaches around 23.5 °C (74.5 °F). However, it reached 28.3 °C (82.9 °F) in August 1995.
Precipitation amounts to 75 mm (3 in), distributed over 12 days.
The day lasts on average 14 hours and 40 minutes. So the days are long.
There are on average 5 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 81%. Hence, the air is normally humid.
The average wind speed is 16 kph (10 mph).
The average sea temperature is of 15.5 °C (60.5 °F). Therefore, the sea is cold for swimming.

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In September, the weather in Dublin is usually mild. The average temperature is of 13.0 °C (55 °F), with a minimum of 9.1 °C (48.3 °F) and a maximum of 17 °C (62.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 3.5 °C (38 °F). However, it dropped to 0.4 °C (32.7 °F) in September 2018.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 22 °C (72 °F). However, it reached 25.6 °C (78.1 °F) in September 2003.
Precipitation amounts to 60 mm (2.4 in), distributed over 10 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 34% of the time.
The average humidity is 83%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 15.5 °C (59.5 °F). Therefore, the sea is cold for swimming.

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In October, the weather in Dublin is usually mild. The average temperature is of 10.2 °C (50 °F), with a minimum of 6.7 °C (44.1 °F) and a maximum of 13.7 °C (56.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 0.5 °C (32.5 °F). However, it dropped to -4.7 °C (23.5 °F) in October 2018.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 18.5 °C (65.5 °F). However, it reached 21.9 °C (71.4 °F) in October 1991.
Precipitation amounts to 80 mm (3.1 in), distributed over 12 days.
The day lasts on average 10 hours and 30 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 31% of the time.
The average humidity is 84%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 14 °C (57.5 °F). Therefore, the sea is very cold for swimming.

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In November, the weather in Dublin is usually quite mild. The average temperature is of 7.3 °C (45 °F), with a minimum of 4.3 °C (39.8 °F) and a maximum of 10.4 °C (50.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around -1.5 °C (29 °F). However, it dropped to -8.4 °C (16.9 °F) in November 2010.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 15 °C (59.5 °F). However, it reached 17.7 °C (63.9 °F) in November 2005.
Precipitation amounts to 75 mm (3 in), distributed over 12 days.
The day lasts on average 8 hours and 35 minutes.
There are on average 2.5 hours of sunshine per day. So, the sun shines 28% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 20 kph (13 mph).
The average sea temperature is of 12.5 °C (54 °F). Therefore, the sea is very cold for swimming.

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In December, the weather in Dublin is usually quite cold. The average temperature is of 5.6 °C (42 °F), with a minimum of 2.6 °C (36.7 °F) and a maximum of 8.5 °C (47.3 °F).
On the coldest nights of the month, the temperature usually drops to around -3.5 °C (26 °F). However, it dropped to -12.1 °C (10.2 °F) in December 2010.
On the warmest days of the month, the temperature usually reaches around 13.5 °C (56.5 °F). However, it reached 15.3 °C (59.5 °F) in December 2016.
Precipitation amounts to 75 mm (3 in), distributed over 13 days.
The day lasts on average 7 hours and 35 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 22% of the time.
The average humidity is 87%. Hence, the air is normally humid.
The average wind speed is 21 kph (13 mph).
The average sea temperature is of 10.5 °C (51 °F). Therefore, the sea is very cold for swimming.