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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Belfast's climate page.
Belfast Temperature in May
Min Temperature
8°C (46°F)
Max Temperature
16°C (61°F)
Water Temperature
9°C (48°F)
Chance of Rain
57%
Precipitation
77 mm (3 in)
Rainy days
17 days
Humidity
89%
Windspeed
4 m/s (8 knots)
Sunshine
184 hours
Percentage Sunshine
39%
Best Places in Ireland in May
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in May →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Belfast in May
The weather can be unpredictable in May, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. Rain is likely on several days, so bring a good rain jacket. Expect water temperatures of around 9°C (48°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Belfast in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Belfast's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Belfast climate overview or explore weather in Ireland.
