January Weather in Belfast, South Africa

Last updated: August 31, 2025

In Belfast, South Africa, the average temperature in January hovers around 18°C (65°F), with a comfortable range from a cool 7°C (46°F) to a warm 29°C (85°F). Expect 120 mm (4.7 in) of precipitation spread over 13 days, contributing to an average humidity of 70%. Whether you’re exploring or relaxing, this month offers a delightful blend of warmth and refreshing rain.

January Temperature in Belfast

In January in Belfast, the average temperature is 18°C (65°F). Maximums can reach 29°C (85°F), while minimums can drop to as low as 7°C (46°F). This mild climate makes Belfast a comfortable destination for travelers looking to enjoy outdoor activities and explore the local sights.

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

The chart illustrates January 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, January typically has an average temperature of 18°C (65°F), with highs reaching up to 29°C (85°F) and lows dropping to around 7°C (46°F).

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

January Precipitation in Belfast

In Belfast in January, the precipitation amount is 120 mm (4.7 in) spread over 13 days.

January Precipitation Trends in Belfast

The chart displays monthly precipitation patterns in Belfast, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Belfast, January typically receives around 120 mm (4.7 inches) of precipitation spread over approximately 13 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Belfast

In Belfast in January humidity is 70%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it quite comfortable for traveling, though it can leave you feeling slightly sticky if you're on the move for too long.

January Average Humidity in Belfast

This chart illustrates the average monthly humidity levels in Belfast, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Belfast is approximately 70%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Belfast

In Belfast in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Belfast in January, 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 January, the maximum UV index in Belfast typically reaches 16, which falls under the extreme exposure category.

Data source: Belfast January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	18°C (65°F)	120 mm (4.7 inches)	70%	extreme
February Weather	18°C (65°F)	132 mm (5.2 inches)	65%	extreme
March Weather	17°C (63°F)	60 mm (2.3 inches)	64%	extreme
April Weather	15°C (59°F)	59 mm (2.3 inches)	63%	very high
May Weather	12°C (54°F)	20 mm (0.8 inches)	64%	very high
June Weather	9°C (49°F)	5 mm (0.2 inches)	61%	high
July Weather	9°C (49°F)	1 mm (0.1 inches)	64%	high
August Weather	13°C (55°F)	3 mm (0.1 inches)	61%	very high
September Weather	16°C (60°F)	15 mm (0.6 inches)	65%	extreme
October Weather	16°C (62°F)	65 mm (2.6 inches)	61%	extreme
November Weather	18°C (64°F)	92 mm (3.6 inches)	68%	extreme
December Weather	18°C (65°F)	158 mm (6.2 inches)	72%	extreme