Belfast
United Kingdom
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Belfast, United Kingdom

A close-up view of the Northern Ireland City Hall located in Belfast, United Kingdom
A close-up view of the Northern Ireland City Hall located in Belfast, United Kingdom
January, the same as December, in Belfast, United Kingdom, is a frosty winter month, with average temperature ranging between max 7.1°C (44.8°F) and min 1.7°C (35.1°F). January is the coldest month, with an average high-temperature of 7.1°C (44.8°F) and an average low-temperature of 1.7°C (35.1°F). Weather in January »
The last month of the winter, February, is also a frosty month in Belfast, United Kingdom, with average temperature ranging between min 1.6°C (34.9°F) and max 7.5°C (45.5°F). In February, the average high-temperature is essentially the same as in January - a still chilly 7.5°C (45.5°F). Weather in February »

March, the first month of the spring, in Belfast, is also a frosty month, with average temperature varying between 2.9°C (37.2°F) and 9.5°C (49.1°F). In Belfast, the average high-temperature in March is essentially the same as in February - a still frosty 9.5°C (49.1°F). Weather in March »

April in Belfast, United Kingdom, is a cool spring month, with average temperature ranging between max 11.9°C (53.4°F) and min 4.3°C (39.7°F). In April, the average high-temperature is relatively the same as in March - a cool 11.9°C (53.4°F). Weather in April »

May, the last month of the spring, in Belfast, is a moderate month, with temperature in the range of an average low of 6.8°C (44.2°F) and an average high of 15°C (59°F). In May, the average high-temperature marginally rises, from a cool 11.9°C (53.4°F) in April, to a mild 15°C (59°F). Weather in May »

June, the first month of the summer, in Belfast, is an enjoyable month, with average temperature ranging between max 17.4°C (63.3°F) and min 9.8°C (49.6°F). In Belfast, the average high-temperature is relatively the same as in May - an enjoyable 17.4°C (63.3°F). Weather in June »

July, like June, in Belfast, United Kingdom, is another enjoyable summer month, with temperature in the range of an average low of 11.7°C (53.1°F) and an average high of 18.8°C (65.8°F). The warmest month is July, with an average high-temperature of 18.8°C (65.8°F) and an average low-temperature of 11.7°C (53.1°F). Weather in July »

The last month of the summer, August, is also an enjoyable month in Belfast, United Kingdom, with temperature in the range of an average high of 18.3°C (64.9°F) and an average low of 11.4°C (52.5°F). In August, the average high-temperature is essentially the same as in July - a still enjoyable 18.3°C (64.9°F). Weather in August »

September, the first month of the autumn, in Belfast, is still a comfortable month, with average temperature varying between 16.4°C (61.5°F) and 9.5°C (49.1°F). In Belfast, the average high-temperature is practically the same as in August - a still enjoyable 16.4°C (61.5°F). Weather in September »

October, like September, in Belfast, United Kingdom, is a cool autumn month, with average temperature ranging between max 12.9°C (55.2°F) and min 6.9°C (44.4°F). In Belfast, the average high-temperature marginally drops, from a comfortable 16.4°C (61.5°F) in September, to a fresh 12.9°C (55.2°F). Weather in October »

November, the last month of the autumn, in Belfast, is also a frosty month, with average temperature fluctuating between 4°C (39.2°F) and 9.5°C (49.1°F). In November, the average high-temperature marginally drops, from a cool 12.9°C (55.2°F) in October, to a chilly 9.5°C (49.1°F). Weather in November »

December, the first month of the winter, in Belfast, is also a frosty month, with average temperature varying between 2.1°C (35.8°F) and 7.4°C (45.3°F). In Belfast, the average high-temperature in December is relatively the same as in November - a still chilly 7.4°C (45.3°F). Weather in December »

What is the coldest month in Belfast?

With an average high-temperature of 7.1°C (44.8°F) and an average low-temperature of 1.7°C (35.1°F), January is the coldest month in Belfast, United Kingdom.

How much does it rain in Belfast?

In Belfast, United Kingdom, during the entire year, the rain falls for 157.5 days and collects up to 860.2mm (33.9") of precipitation.

When is the lowest UV index in Belfast?

January and December, with an average maximum UV index of 0, are months with the lowest UV index.

What is the month with the coldest sea water in Belfast?

The month with the coldest seawater in Belfast, United Kingdom, is March, with an average sea temperature of 8°C (46.4°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

What is the driest month in Belfast?

May is the month with the least rainfall. Rain falls for 11.7 days and accumulates 57.3mm (2.3") of precipitation.

What month has the most sunshine in Belfast?

With an average of 6.4h of sunshine, May has the most sunshine of the year.

When are the longest days in Belfast?

The month with the longest days in Belfast is June, with an average of 17.2h of daylight.

What is the month with the highest UV index in Belfast?

Months with the highest UV index in Belfast are June and July, with an average maximum UV index of 6.

What is the warmest month in Belfast?

July is the warmest month in Belfast, United Kingdom, with an average high-temperature of 18.8°C (65.8°F) and an average low-temperature of 11.7°C (53.1°F).

What is the month with the warmest sea water in Belfast?

The month with the warmest seawater in Belfast is September, with an average sea temperature of 14.3°C (57.7°F). Swimming in 14.3°C (57.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the rainiest month in Belfast?

The month with the most rainfall in Belfast is October when the rain falls for 14.4 days and typically aggregates up to 89.6mm (3.5") of precipitation.

What is the month with the shortest days in Belfast?

With an average of 7.4h of daylight, December has the shortest days of the year in Belfast, United Kingdom.

What is the month with the least sunshine in Belfast?

The month with the least sunshine in Belfast is December, with an average of 1.5h of sunshine.
Average rainfall - Belfast, United Kingdom

The wettest month (with the highest rainfall) is October (89.6mm).
The driest month (with the lowest rainfall) is May (57.3mm).

Average rainfall days - Belfast, United Kingdom

The month with the highest number of rainy days is January (14.8 days).
The month with the lowest number of rainy days is June (11.3 days).

Average sea temperature - Belfast, United Kingdom

The best month for swimming (with the highest average sea temperature) is September (14.3°C).
The coldest month (with the lowest average sea temperature) is March (8°C).

Average daylight / Average sunshine - Belfast, United Kingdom