May Weather in Thornhill, South Africa

Last updated: August 31, 2025

In May, the average temperature in Thornhill, South Africa is a comfortable 17°C (63°F). Visitors can expect a minimum temperature of 9°C (49°F), while the maximum can reach 29°C (84°F). During this month, Thornhill receives an average precipitation of 31 mm (1.2 in) spread over 6 days, contributing to an average humidity of 76%.

May Temperature in Thornhill

In May in Thornhill, the average temperature is 17°C (63°F). The maximum can reach 29°C (84°F), while the minimum can drop as low as 9°C (49°F). This weather makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates May temperature patterns in Thornhill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thornhill, May typically has an average temperature of 17°C (63°F), with highs reaching up to 29°C (84°F) and lows dropping to around 9°C (49°F).

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

May Precipitation in Thornhill

In Thornhill in May, the precipitation amount is 31 mm (1.2 in) over a span of 6 days.

May Precipitation Trends in Thornhill

The chart displays monthly precipitation patterns in Thornhill, 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 Thornhill, May typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 6 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 Thornhill

In Thornhill in May humidity is 76%. With an average temperature of 17°C (63°F), this humidity feels like traveling through a warm, enveloping blanket, making every outdoor adventure feel sticky and heavy, yet pleasantly refreshing when you find a cool breeze.

May Average Humidity in Thornhill

This chart illustrates the average monthly humidity levels in Thornhill, 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 Thornhill is approximately 76%, 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 Thornhill

In Thornhill in May, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Thornhill.

Maximum UV Index Levels in Thornhill for May

The chart shows the monthly maximum UV Index (UVI) for Thornhill 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 Thornhill typically reaches 5, which falls under the moderate exposure category.

Data source: Thornhill 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 Thornhill Compares to Other Months

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

This table compares monthly weather conditions in Thornhill, 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)	28 mm (1.1 inches)	79%	extreme
February Weather	21°C (70°F)	48 mm (1.9 inches)	81%	extreme
March Weather	20°C (69°F)	43 mm (1.7 inches)	83%	extreme
April Weather	18°C (65°F)	28 mm (1.1 inches)	80%	very high
May Weather	17°C (63°F)	31 mm (1.2 inches)	76%	moderate
June Weather	16°C (62°F)	19 mm (0.7 inches)	72%	moderate
July Weather	16°C (60°F)	33 mm (1.3 inches)	74%	moderate
August Weather	15°C (59°F)	53 mm (2.1 inches)	72%	high
September Weather	16°C (61°F)	42 mm (1.6 inches)	75%	very high
October Weather	17°C (63°F)	38 mm (1.5 inches)	76%	extreme
November Weather	18°C (65°F)	47 mm (1.9 inches)	76%	extreme
December Weather	20°C (67°F)	48 mm (1.9 inches)	78%	extreme