Belfast Weather in May

May in Belfast brings moderate temperatures, with highs of 16°C (61°F) and nights dropping to 8°C (46°F). Rainfall is on the higher side this month, averaging around 77 mm (3 in), so keep a rain jacket handy.

Rainfall in Belfast in May

Looking at the last 30 years, the data shows about 17 days with rain, averaging 77 mm (3 in) for the month. Expect plenty of grey, overcast days rather than intense storms. The rain rarely amounts to much on any given day.

Temperature in Belfast in May

In May, Belfast gets moderate temperatures, with highs of 16°C (61°F). Nights cool to around 8°C (46°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. With lows around 8°C (46°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Sunshine in Belfast in May

The area enjoys a balanced 184 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Wind Speed in Belfast in May

In May, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.

Average water temperature in May

With water temperatures around 9°C (48°F), swimming isn't really an option for most visitors. The cold sets in quickly and a wetsuit won't fully solve it.

If you prefer dry days with pleasant temperatures, July typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.