May Weather in Belfast, New Zealand

Last updated: August 31, 2025

In May, the average temperature in Belfast, New Zealand is a cool 11°C (52°F), with lows dipping to 4°C (39°F) and highs reaching up to 20°C (69°F). Expect around 52 mm (2.1 in) of precipitation over roughly 7 days, coupled with a high average humidity of 82%. Plan accordingly to stay comfortable!

May Temperature in Belfast

In May in Belfast, the average temperature is 11°C (52°F). Maximums can reach 20°C (69°F), and minimums can be as low as 4°C (39°F). It's a pleasant time to visit, perfect for outdoor activities and exploring the local sights.

May Weather in Belfast: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Belfast, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belfast, May typically has an average temperature of 11°C (52°F), with highs reaching up to 20°C (69°F) and lows dropping to around 4°C (39°F).

Data source: Temperature data for Belfast generated using information from the Copernicus Climate Change Service.

May Precipitation in Belfast

In Belfast in May, the precipitation amount is 52 mm (2.1 in) over the course of 7 days.

May Precipitation Trends in Belfast

The chart displays monthly precipitation patterns in Belfast, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Belfast, May typically receives around 52 mm (2.1 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Belfast

In Belfast in May, humidity is 82%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers and stay prepared for the moisture-laden air as you explore your surroundings.

May Average Humidity in Belfast

This chart illustrates the average monthly humidity levels in Belfast, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Belfast is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Belfast

In Belfast in May, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Belfast, you can check the information here.

Maximum UV Index Levels in Belfast for May

The chart shows the monthly maximum UV Index (UVI) for Belfast in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Belfast typically reaches 3, which falls under the moderate exposure category.

Data source: Belfast May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Belfast Compares to Other Months

Weather in Belfast varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Belfast, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Belfast, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	17°C (63°F)	47 mm (1.8 inches)	72%	extreme
February Weather	17°C (63°F)	40 mm (1.6 inches)	72%	extreme
March Weather	16°C (60°F)	55 mm (2.2 inches)	77%	very high
April Weather	13°C (56°F)	70 mm (2.8 inches)	77%	high
May Weather	11°C (52°F)	52 mm (2.1 inches)	82%	moderate
June Weather	9°C (48°F)	66 mm (2.6 inches)	84%	low
July Weather	8°C (47°F)	66 mm (2.6 inches)	85%	low
August Weather	9°C (48°F)	46 mm (1.8 inches)	82%	moderate
September Weather	10°C (50°F)	46 mm (1.8 inches)	82%	moderate
October Weather	12°C (53°F)	56 mm (2.2 inches)	79%	very high
November Weather	14°C (57°F)	68 mm (2.7 inches)	77%	very high
December Weather	16°C (61°F)	81 mm (3.2 inches)	75%	extreme