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

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.

How many days does it rain in Belfast?

Throughout the year, in Belfast, there are 157.5 rainfall days, and 860.2mm (33.9") of precipitation is accumulated.

When is the sea coldest in Belfast?

Month with the coldest seawater in Belfast is March, with an average sea temperature of 8°C (46.4°F). Swimming in 8°C (46.4°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 driest month in Belfast?

The month with the least rainfall is May when the rain falls for 11.7 days and typically collects 57.3mm (2.3") of precipitation.

What is the warmest month in Belfast?

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

When is the sea warmest in Belfast?

September is the month with the warmest seawater in Belfast, with an average sea temperature of 14.3°C (57.7°F). Swimming in 14.3°C (57.7°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

What is the rainiest month in Belfast?

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