January Weather in Heidelberg, South Africa

Last updated: August 31, 2025

In January at Heidelberg, South Africa, the average temperature hovers around 21°C (69°F). While you might experience a refreshing low of 9°C (48°F), the mercury can rise to a warm 33°C (91°F). Expect about 121 mm (4.8 in) of precipitation over 14 days, contributing to an average humidity level of 79%. Get ready for a mix of warm days and occasional rain!

January Temperature in Heidelberg

In January in Heidelberg, the average temperature is 21°C (69°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 9°C (48°F). This diverse temperature range makes it ideal for traveling, allowing for a variety of outdoor activities and experiences.

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

The chart illustrates January temperature patterns in Heidelberg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heidelberg, January typically has an average temperature of 21°C (69°F), with highs reaching up to 33°C (91°F) and lows dropping to around 9°C (48°F).

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

January Precipitation in Heidelberg

In Heidelberg in January, the precipitation amount is 121 mm (4.8 in) over a span of 14 days.

January Precipitation Trends in Heidelberg

The chart displays monthly precipitation patterns in Heidelberg, 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 Heidelberg, January typically receives around 121 mm (4.8 inches) of precipitation spread over approximately 14 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 Heidelberg

In Heidelberg in January, humidity is 79%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace, making it ideal for leisurely explorations yet challenging for those unaccustomed to the mugginess while traveling.

January Average Humidity in Heidelberg

This chart illustrates the average monthly humidity levels in Heidelberg, 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 Heidelberg 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 Heidelberg

In Heidelberg 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 Heidelberg.

Maximum UV Index Levels in Heidelberg for January

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

Data source: Heidelberg 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 Heidelberg Compares to Other Months

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

This table compares monthly weather conditions in Heidelberg, 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 (69°F)	121 mm (4.8 inches)	79%	extreme
February Weather	20°C (69°F)	126 mm (5.0 inches)	77%	extreme
March Weather	19°C (67°F)	72 mm (2.8 inches)	77%	extreme
April Weather	16°C (62°F)	60 mm (2.4 inches)	81%	very high
May Weather	13°C (56°F)	14 mm (0.5 inches)	82%	high
June Weather	11°C (51°F)	5 mm (0.2 inches)	73%	high
July Weather	10°C (51°F)	2 mm (0.1 inches)	71%	high
August Weather	14°C (57°F)	2 mm (0.1 inches)	68%	very high
September Weather	18°C (64°F)	9 mm (0.4 inches)	74%	extreme
October Weather	19°C (66°F)	66 mm (2.6 inches)	74%	extreme
November Weather	20°C (69°F)	106 mm (4.2 inches)	82%	extreme
December Weather	20°C (69°F)	156 mm (6.1 inches)	81%	extreme