Belfast, Northern Ireland Weather by Month and Climate Averages

How much rain does Belfast get?

Belfast gets 978 mm of precipitation in an average year, spread over about 215 days with measurable rain. That is more rainy days than 66% of the UK.

November is the wettest month, with 106 mm. April is the driest, with 64 mm. November has the most rainy days, about 22.

The longest dry spell in the last five years lasted 20 days, to June 9, 2023.

Belfast weather by month

Belfast weather in January

In January, Belfast averages a high of 8°C and a low of 2°C. It gets 89 mm of precipitation over about 21 rainy days. The sun is out about 28% of daylight hours. The January record high is 14°C (2020) and the record low is -10°C (1982).

Belfast weather in February

In February, Belfast averages a high of 9°C and a low of 2°C. It gets 73 mm of precipitation over about 18 rainy days. The sun is out about 22% of daylight hours. The February record high is 16°C (2008) and the record low is -4°C (1983).

Belfast weather in March

In March, Belfast averages a high of 11°C and a low of 3°C. It gets 73 mm of precipitation over about 18 rainy days. The sun is out about 29% of daylight hours. The March record high is 20°C (2012) and the record low is -6°C (2001).

Belfast weather in April

In April, Belfast averages a high of 13°C and a low of 5°C. It gets 64 mm of precipitation over about 16 rainy days. The sun is out about 34% of daylight hours. The April record high is 22°C (2025) and the record low is -6°C (1973).

Belfast weather in May

In May, Belfast averages a high of 16°C and a low of 7°C. It gets 68 mm of precipitation over about 16 rainy days. The sun is out about 27% of daylight hours. The May record high is 25°C (2010) and the record low is -2°C (1979).

Belfast weather in June

In June, Belfast averages a high of 18°C and a low of 10°C. It gets 74 mm of precipitation over about 15 rainy days. The sun is out about 25% of daylight hours. The June record high is 29°C (2018) and the record low is 2°C (1975). June is one of the most comfortable months to visit.

Belfast weather in July

In July, Belfast averages a high of 19°C and a low of 12°C. It gets 77 mm of precipitation over about 16 rainy days. The sun is out about 20% of daylight hours. The July record high is 29°C (1983) and the record low is 6°C (1971). July is one of the most comfortable months to visit.

Belfast weather in August

In August, Belfast averages a high of 19°C and a low of 12°C. It gets 86 mm of precipitation over about 18 rainy days. The sun is out about 28% of daylight hours. The August record high is 28°C (2022) and the record low is 5°C (1986). August is one of the most comfortable months to visit.

Belfast weather in September

In September, Belfast averages a high of 17°C and a low of 10°C. It gets 75 mm of precipitation over about 16 rainy days. The sun is out about 28% of daylight hours. The September record high is 26°C (2023) and the record low is 1°C (1974). September is one of the most comfortable months to visit.

Belfast weather in October

In October, Belfast averages a high of 14°C and a low of 7°C. It gets 98 mm of precipitation over about 19 rainy days. The sun is out about 23% of daylight hours. The October record high is 21°C (2023) and the record low is -1°C (1988).

Belfast weather in November

In November, Belfast averages a high of 11°C and a low of 4°C. It gets 106 mm of precipitation over about 22 rainy days. The sun is out about 22% of daylight hours. The November record high is 17°C (2007) and the record low is -3°C (2010).

Belfast weather in December

In December, Belfast averages a high of 8°C and a low of 3°C. It gets 95 mm of precipitation over about 20 rainy days. The sun is out about 22% of daylight hours. The December record high is 15°C (2007) and the record low is -9°C (2010).

Sunshine, humidity and wind in Belfast

April is the sunniest month in Belfast, with sunshine about 34% of daylight hours. July is the cloudiest, at 20%. Over the year the sun shines about 26% of daylight hours. Belfast is cloudier than 79% of the UK.

Humidity peaks in December at 87% and is lowest in April at 77%.

First and last freeze in Belfast

The first fall freeze in Belfast typically comes around November 20, and the last spring freeze around March 29. That leaves a frost-free growing season of about 236 days.

Belfast weather records

The hottest temperature on record at the Belfast station is 29°C, on July 11, 1983. The coldest is -10°C, on January 12, 1982.

The wettest day on record brought 92 mm of rain, on August 15, 1970.

30 all-time records have been set at the station since 1970.

The annual mean temperature has changed by +0.3°C per decade since 1970.

The best time to visit Belfast

The most comfortable time to visit is typically June to September, when daytime highs sit near 18°C.

Winter (December–February) is chilly, with average highs around 8°C and lows near 3°C.

Spring (March–May) is chilly, with average highs around 13°C and lows near 5°C.

Summer (June–August) is mild, with average highs around 19°C and lows near 11°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 14°C and lows near 7°C.

Belfast climate questions

How much rain does Belfast get?

Belfast gets 978 mm of precipitation in an average year, over about 215 rainy days.

What is the wettest month in Belfast?

November is the wettest month in Belfast, with 106 mm. April is the driest, with 64 mm.

How many rainy days does Belfast have a year?

Belfast has about 215 days with measurable rain in an average year. November has the most, about 22.

What is the hottest month in Belfast?

July is the warmest month in Belfast, with an average high of 19°C.

What is the coldest month in Belfast?

January is the coldest month in Belfast, with an average low of 2°C.

What is the record high temperature in Belfast?

The record high at the Belfast station is 29°C, set on July 11, 1983. The record low is -10°C, on January 12, 1982.

What is the sunniest month in Belfast?

April is the sunniest month in Belfast, with sunshine about 34% of daylight hours. July is the cloudiest.

When is the first frost in Belfast?

The first fall freeze in Belfast typically comes around November 20. The last spring freeze is around March 29.

What is the best time to visit Belfast?

The most comfortable time to visit is typically June to September, when daytime highs sit near 18°C.