May 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 temperature in May in Belfast?

In Belfast, United Kingdom, in May, the average high-temperature is 15°C (59°F), and the average low-temperature is 6.8°C (44.2°F).

How many days does it rain in May in Belfast?

In Belfast, United Kingdom, in May, during 11.7 rainfall days, typically, 57.3mm (2.3") of precipitation is accumulated.

How cold is the water in May in Belfast?

In Belfast, in May, the average water temperature is 10°C (50°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.
Average temperature in May - Belfast, United Kingdom
  • Average high temperature in May: 15°C

The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is January (7.1°C).

  • Average low temperature in May: 6.8°C

The month with the highest average low temperature is July (11.7°C).
The coldest month (with the lowest average low temperature) is February (1.6°C).

Average rainfall in May - Belfast, United Kingdom
  • Average rainfall in May: 57.3mm

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 in May - Belfast, United Kingdom
  • Average rainfall days in May: 11.7 days

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 in May - Belfast, United Kingdom
  • Average sea temperature in May: 10°C

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 in May / Average sunshine in May - Belfast, United Kingdom
  • Average daylight in May: 16.1h

The month with the longest days is June (Average daylight: 17.2h).
The month with shortest days is December (Average daylight: 7.4h).

  • Average sunshine in May: 6.4h

The month with most sunshine is May (Average sunshine: 6.4h).
The month with least sunshine is December (Average sunshine: 1.5h).

Average UV index in May - Belfast, United Kingdom
  • Average UV index in May: 5

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).

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