Belfast Weather in May

May in Belfast brings moderate temperatures around 15°C (59°F) during the day, dropping to 8°C (46°F) at night, with quite a bit of rainfall expected, averaging around 77 mm (3 in) for the month.

Rainfall in Belfast in May

Analyzing past climate data, one can expect approximately 16 days of rain, averaging 77 mm (3 in). With rain spread across many days but low totals, showers are typically short and light rather than heavy.

Temperature in Belfast in May

Daytime temperatures in Belfast reach 15°C (59°F) in May, dropping to 8°C (46°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 8°C (46°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in Belfast in May

You can expect a moderate amount of sunlight, with approximately 184 hours. This means a pleasant mix of sun and overcast.

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

At 9°C (48°F), the water is very cold. Most people find it too uncomfortable for anything beyond a brief wade.

If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Belfast.