Average temperatures, rainfall and packing tips for Belfast, United Kingdom in May
May in Belfast is typically mild, with average daytime highs around 16°C and nights near 9°C. It is one of the warmer months of Belfast's year.
Expect some rain: around 76 mm falls in Belfast during May on average.
If your dates are flexible, the most comfortable months in Belfast are usually July and August.
← Belfast weather tomorrow (live)
In May, Belfast averages a daytime high of about 16°C and a night-time low of around 9°C, based on recent historical data.
Expect some rain: around 76 mm falls in Belfast during May on average.
May is a workable time to visit Belfast, with mild days - just pack accordingly. If your dates are flexible, the most comfortable months in Belfast are usually July and August.