May Weather in Heilbron, South Africa

Last updated: August 31, 2025

In May, the average temperature in Heilbron, South Africa hovers around 13°C (56°F), with a range that can dip to a chilly -2°C (28°F) or soar to a pleasant 26°C (79°F). Expect about 11 mm (0.4 in) of precipitation spread over 2 days, and prepare for a relatively high humidity level of 82%.

May Temperature in Heilbron

In May in Heilbron, the average temperature is 13°C (56°F). The maximum can reach 26°C (79°F), while the minimum can drop as low as -2°C (28°F). Be prepared for a range of temperatures if you're planning to travel during this time.

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

The chart illustrates May 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, May typically has an average temperature of 13°C (56°F), with highs reaching up to 26°C (79°F) and lows dropping to around -2°C (28°F).

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

May Precipitation in Heilbron

In Heilbron in May, the precipitation amount is 11 mm (0.4 in) over the course of 2 days.

May Precipitation Trends in Heilbron

The chart displays monthly precipitation patterns in Heilbron, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Heilbron, May typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 2 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Heilbron

In Heilbron in May, humidity is 82%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel much cooler than it is and creating a heavy atmosphere that can be exhausting for travelers.

May Average Humidity in Heilbron

This chart illustrates the average monthly humidity levels in Heilbron, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Heilbron is approximately 82%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Heilbron

In Heilbron in May, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Heilbron.

Maximum UV Index Levels in Heilbron for May

The chart shows the monthly maximum UV Index (UVI) for Heilbron in May, 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 May, the maximum UV index in Heilbron typically reaches 7, which falls under the high exposure category.

Data source: Heilbron May 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 May 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 May’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 May’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