December Weather in Newcastle, South Africa

Last updated: August 31, 2025

In December, the average temperature in Newcastle, South Africa hovers around 21°C (70°F), offering a pleasant climate. However, be prepared for fluctuations, as temperatures can dip as low as 9°C (49°F) and soar up to a sweltering 36°C (98°F). With 161 mm (6.3 in) of precipitation spread over 20 days, it’s wise to carry an umbrella, while the average humidity sits at a sticky 81%.

December Temperature in Newcastle

In December in Newcastle, the average temperature is 21°C (70°F), with maximums reaching 36°C (98°F) and minimums dropping as low as 9°C (49°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for fluctuations in temperature.

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

The chart illustrates December temperature patterns in Newcastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newcastle, December typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (98°F) and lows dropping to around 9°C (49°F).

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

December Precipitation in Newcastle

In Newcastle in December, the precipitation amount is 161 mm (6.3 in) spread over 20 days.

December Precipitation Trends in Newcastle

The chart displays monthly precipitation patterns in Newcastle, 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 Newcastle, December typically receives around 161 mm (6.3 inches) of precipitation spread over approximately 20 days.

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

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Millimeters (mm) Inches (in)

December Humidity in Newcastle

In Newcastle in December, humidity is 81%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace, making outdoor activities slightly uncomfortable and necessitating frequent breaks in the shade or air conditioning for a refreshing escape.

December Average Humidity in Newcastle

This chart illustrates the average monthly humidity levels in Newcastle, 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 Newcastle is approximately 81%, offering insight into how humid the weather typically is during this month.

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

December UV Index in Newcastle

In Newcastle 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 Newcastle.

Maximum UV Index Levels in Newcastle for December

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

Data source: Newcastle 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 Newcastle Compares to Other Months

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

This table compares monthly weather conditions in Newcastle, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (70°F)	117 mm (4.6 inches)	79%	extreme
February Weather	21°C (70°F)	136 mm (5.3 inches)	77%	extreme
March Weather	20°C (69°F)	101 mm (4.0 inches)	77%	extreme
April Weather	17°C (63°F)	68 mm (2.7 inches)	81%	very high
May Weather	14°C (58°F)	28 mm (1.1 inches)	82%	high
June Weather	12°C (53°F)	9 mm (0.4 inches)	73%	moderate
July Weather	12°C (54°F)	3 mm (0.1 inches)	71%	high
August Weather	15°C (59°F)	22 mm (0.9 inches)	68%	very high
September Weather	18°C (64°F)	38 mm (1.5 inches)	74%	extreme
October Weather	18°C (66°F)	76 mm (3.0 inches)	74%	extreme
November Weather	20°C (68°F)	106 mm (4.2 inches)	82%	extreme
December Weather	21°C (70°F)	161 mm (6.3 inches)	81%	extreme