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December Weather in Belfast, South Africa

Last updated: August 31, 2025

In December, the average temperature in Belfast, South Africa hovers around 18°C (65°F), with a minimum of 7°C (45°F) and a maximum reaching 30°C (87°F). This period typically sees 158 mm (6.2 in) of precipitation spread over 20 days, contributing to an average humidity of 72%. Prepare for a mix of warm days and refreshing, rainy spells!

December Temperature in Belfast

In December, in Belfast, the average temperature is 18°C (65°F). The maximum can reach 30°C (87°F), while the minimum can drop as low as 7°C (45°F). This climate makes Belfast an ideal destination for travelers seeking pleasant weather and a range of 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 18°C (65°F), with highs reaching up to 30°C (87°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec656563595449495560616465
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 total precipitation amount is 158 mm (6.2 in) spread over 20 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 158 mm (6.2 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec120132605920513156592158
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 72%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace, making traveling somewhat uncomfortable as the air clings to your skin and the heat can be stifling, yet it's perfect for enjoying leisurely strolls under the shade.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%65%64%64%65%61%64%61%65%61%68%72%
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 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to 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 16, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec16161310867911131416
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 Weather18°C (65°F)120 mm (4.7 inches)70%extreme
February Weather18°C (65°F)132 mm (5.2 inches)65%extreme
March Weather17°C (63°F)60 mm (2.3 inches)64%extreme
April Weather15°C (59°F)59 mm (2.3 inches)63%very high
May Weather12°C (54°F)20 mm (0.8 inches)64%very high
June Weather9°C (49°F)5 mm (0.2 inches)61%high
July Weather9°C (49°F)1 mm (0.1 inches)64%high
August Weather13°C (55°F)3 mm (0.1 inches)61%very high
September Weather16°C (60°F)15 mm (0.6 inches)65%extreme
October Weather16°C (62°F)65 mm (2.6 inches)61%extreme
November Weather18°C (64°F)92 mm (3.6 inches)68%extreme
December Weather18°C (65°F)158 mm (6.2 inches)72%extreme

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