Weather in Belfast in May 2025
- May is usually the driest month of the year in Belfast
Average weather
Average temperature in Belfast in May
The expected average maximum temperature in May is +16°C with a maximum of +21°C and a minimum of +5°C.
The average maximum temperature goes up 38% by the end of the month, compared with the beginning of the month, from +14°C to +20°C.
Is Belfast warm or cold in May?
Belfast is typically mild in May.
Maximum temperatures go up compared to the previous month from +11°C to +14°C. The minimum temperature also goes up from +5°C to +8°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how May is compared to other months in Belfast:
Water temperature in Belfast in May
Water in Belfast in May is Cold. It varies from +9°C to +11°C, with an average of +10°C. This is almost similar to the air temperature, which averages +14°C.
In May, water temperatures are average relative to the rest of the year:
Can you swim in Belfast in May?
Climate in Belfast in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +11°C | +14°C | +17°C | ||||
| Min. temperature | ||||||
| -3°C | -1°C | +2°C | ||||
| Max. temperature | ||||||
| +22°C | +25°C | +30°C | ||||
| Rainfall | ||||||
| 60 mm | 69 mm | 73 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +9°C | +10°C | +12°C | ||||
| Humidity | ||||||
| 77% | 76% | 77% | ||||
| Air pressure | ||||||
| 1013 HPa | 1014 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 3 | 4 | 2 | ||||
| Cloudy days | ||||||
| 8 | 8 | 8 | ||||
| Rainy days | ||||||
| 18 | 19 | 19 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May weather is still as ok as in April. It’s getting warmer as May arrives. The average maximum temperature goes up from +11°C to +14°C during the day. Prepare for more rain. Average rainfall goes from 60 mm to 69 mm. It feels drier, as humidity decreases from 77% to 76%. The average wind speed doesn’t change much during May, staying around 4 m/s. The good news is there are likely to be more sunny days in May, from 3 to 4.
June brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Belfast is gradually decreasing during May, going from 4 m/s to 2 m/s over the course of the month.
Rain
How was the weather last May in Belfast?
Climate Change over Years
The climate in Belfast in May has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+11°C) and the highest in 1995 (+14°C). The driest year was 2003 with only 711 mm of rainfall, and the wettest year was 2019 with 1255 mm.
FAQ
Is May a good time to visit Belfast?
Can you sunbathe in Belfast in May?
Can you swim in Belfast in May?
Is Belfast rainy in May?
Is it sunny in Belfast in May?
Other cities in United Kingdom
Monthly weather in Belfast
Source of the data
For this page, we’ve looked at the typical weather in Belfast, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.