December Weather in Heilbron, South Africa

Last updated: August 31, 2025

The average temperature in Heilbron, South Africa during December is a comfortable 21°C (69°F). However, be prepared for some temperature variation, with minimums dipping to 10°C (50°F) and highs reaching up to 36°C (97°F). Expect 160 mm (6.3 in) of precipitation spread over 17 days, resulting in an average humidity of 81%.

December Temperature in Heilbron

In December in Heilbron, the average temperature is 21°C (69°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 10°C (50°F). This makes it an ideal time for travelers seeking warm weather while still enjoying cooler nights.

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

The chart illustrates December temperature patterns in Heilbron, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heilbron, December typically has an average temperature of 21°C (69°F), with highs reaching up to 36°C (97°F) and lows dropping to around 10°C (50°F).

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

December Precipitation in Heilbron

In Heilbron in December, the precipitation amount is 160 mm (6.3 in) over the course of 17 days.

December Precipitation Trends in Heilbron

The chart displays monthly precipitation patterns in Heilbron, 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 Heilbron, December typically receives around 160 mm (6.3 inches) of precipitation spread over approximately 17 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 Heilbron

In Heilbron in December humidity is 81%. With an average temperature of 21°C (69°F), this humidity feels like a warm, enveloping blanket that's both heavy and sticky, making outdoor activities feel more strenuous and travel slightly uncomfortable.

December Average Humidity in Heilbron

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

In Heilbron 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 Heilbron.

Maximum UV Index Levels in Heilbron for December

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

Data source: Heilbron 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 Heilbron Compares to Other Months

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

This table compares monthly weather conditions in Heilbron, 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)	109 mm (4.3 inches)	79%	extreme
February Weather	21°C (70°F)	114 mm (4.5 inches)	77%	extreme
March Weather	20°C (67°F)	70 mm (2.8 inches)	77%	extreme
April Weather	16°C (62°F)	66 mm (2.6 inches)	81%	extreme
May Weather	13°C (56°F)	11 mm (0.4 inches)	82%	high
June Weather	10°C (50°F)	8 mm (0.3 inches)	73%	moderate
July Weather	10°C (50°F)	3 mm (0.1 inches)	71%	high
August Weather	13°C (56°F)	7 mm (0.3 inches)	68%	very high
September Weather	17°C (63°F)	7 mm (0.3 inches)	74%	extreme
October Weather	19°C (66°F)	53 mm (2.1 inches)	74%	extreme
November Weather	20°C (69°F)	91 mm (3.6 inches)	82%	extreme
December Weather	21°C (69°F)	160 mm (6.3 inches)	81%	extreme