January Weather in Newcastle, South Africa

Last updated: August 31, 2025

In Newcastle, South Africa, the average temperature in January is 21°C (70°F), with a minimum of 10°C (51°F) and a maximum reaching 36°C (96°F). Expect some rainfall, as the area sees 117 mm (4.6 in) of precipitation over approximately 15 days, contributing to an average humidity of 79%. Stay prepared for a mix of warm days and cooling showers!

January Temperature in Newcastle

In January in Newcastle, the average temperature is 21°C (70°F). Maximums can reach 36°C (96°F), while minimums can drop as low as 10°C (51°F). This pleasant climate makes it an ideal time for travel, offering warm days and cooler nights for enjoyable outdoor activities.

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

The chart illustrates January 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, January typically has an average temperature of 21°C (70°F), with highs reaching up to 36°C (96°F) and lows dropping to around 10°C (51°F).

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

January Precipitation in Newcastle

In Newcastle in January, the total precipitation amount is 117 mm (4.6 in), occurring over the course of 15 days.

January Precipitation Trends in Newcastle

The chart displays monthly precipitation patterns in Newcastle, 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 Newcastle, January typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 15 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Newcastle

In Newcastle in January humidity is 79%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor exploration a bit sticky but still enjoyable for travelers who appreciate the lush, vibrant atmosphere.

January Average Humidity in Newcastle

This chart illustrates the average monthly humidity levels in Newcastle, 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 Newcastle is approximately 79%, 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 Newcastle

In Newcastle in January, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Newcastle.

Maximum UV Index Levels in Newcastle for January

The chart shows the monthly maximum UV Index (UVI) for Newcastle 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 Newcastle typically reaches 15, which falls under the extreme exposure category.

Data source: Newcastle 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 Newcastle Compares to Other Months

Weather in Newcastle varies notably across the year, with each month offering distinct climate conditions. This page compares January’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 January’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