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December Weather in Belfast, New Zealand

Last updated: August 31, 2025

In Belfast, New Zealand, the average temperature for December hovers around 16°C (61°F). Expect a range that dips to a minimum of 9°C (48°F) and rises to a pleasant 26°C (78°F). Be prepared for some rain, as 81 mm (3.2 in) of precipitation is expected over 11 days, accompanied by a notable average humidity of 75%.

December Temperature in Belfast

In December in Belfast, the average temperature is 16°C (61°F). The maximum can reach 26°C (78°F) and the minimum can be as low as 9°C (48°F). This mild climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates December 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, December typically has an average temperature of 16°C (61°F), with highs reaching up to 26°C (78°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec636360565248464850535760
Data source: Temperature data for Belfast generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Belfast

In Belfast in December, the precipitation amount is 81 mm (3.2 in) over a span of 11 days.

December Precipitation Trends in Belfast

The chart displays monthly precipitation patterns in Belfast, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Belfast, December typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec474055705266664746566881
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Belfast

In Belfast in December humidity is 75%. With an average temperature of 16°C (61°F), this humidity feels like a warm, muggy embrace, making traveling somewhat uncomfortable as you may find yourself constantly adjusting your clothing and seeking shade to escape the sticky air.

December Average Humidity in Belfast

This chart illustrates the average monthly humidity levels in Belfast, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Belfast is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%72%77%77%82%84%85%83%82%79%77%75%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Belfast

In Belfast in December, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Belfast.

Maximum UV Index Levels in Belfast for December

The chart shows the monthly maximum UV Index (UVI) for Belfast in December, 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 December, the maximum UV index in Belfast typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1312963223591012
Data source: Belfast December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (63°F)47 mm (1.8 inches)72%extreme
February Weather17°C (63°F)40 mm (1.6 inches)72%extreme
March Weather16°C (60°F)55 mm (2.2 inches)77%very high
April Weather13°C (56°F)70 mm (2.8 inches)77%high
May Weather11°C (52°F)52 mm (2.1 inches)82%moderate
June Weather9°C (48°F)66 mm (2.6 inches)84%low
July Weather8°C (47°F)66 mm (2.6 inches)85%low
August Weather9°C (48°F)46 mm (1.8 inches)82%moderate
September Weather10°C (50°F)46 mm (1.8 inches)82%moderate
October Weather12°C (53°F)56 mm (2.2 inches)79%very high
November Weather14°C (57°F)68 mm (2.7 inches)77%very high
December Weather16°C (61°F)81 mm (3.2 inches)75%extreme

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