May Weather in Williston, South Africa

Last updated: August 31, 2025

In May, the average temperature in Williston, South Africa hovers around 15°C (59°F). Expect a minimum chill of -2°C (29°F) and a warm maximum of 30°C (87°F). During this time, you can anticipate about 6 mm (0.2 in) of precipitation over the course of 1 day. Don’t forget your umbrella, as the average humidity is a notable 78%, making the air feel a bit more refreshing!

May Temperature in Williston

In May in Williston, the average temperature is 15°C (59°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as -2°C (29°F). This variability means travelers should pack for both warm and cool weather to fully enjoy their visit.

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

The chart illustrates May temperature patterns in Williston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williston, May typically has an average temperature of 15°C (59°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (29°F).

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

May Precipitation in Williston

In Williston in May, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.

May Precipitation Trends in Williston

The chart displays monthly precipitation patterns in Williston, 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 Williston, May typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 1 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Williston

In Williston in May, humidity is 78%. With an average temperature of 15°C (59°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit more tiring and requiring frequent breaks for hydration as you explore the area.

May Average Humidity in Williston

This chart illustrates the average monthly humidity levels in Williston, 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 Williston is approximately 78%, 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 Williston

In Williston in May, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Williston, you can refer to this Hourly UV Index in Williston.

Maximum UV Index Levels in Williston for May

The chart shows the monthly maximum UV Index (UVI) for Williston 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 Williston typically reaches 6, which falls under the high exposure category.

Data source: Williston 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 Williston Compares to Other Months

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

This table compares monthly weather conditions in Williston, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (79°F)	10 mm (0.4 inches)	50%	extreme
February Weather	25°C (78°F)	11 mm (0.4 inches)	55%	extreme
March Weather	23°C (73°F)	15 mm (0.6 inches)	65%	extreme
April Weather	18°C (65°F)	28 mm (1.1 inches)	72%	very high
May Weather	15°C (59°F)	6 mm (0.2 inches)	78%	high
June Weather	11°C (53°F)	5 mm (0.2 inches)	79%	moderate
July Weather	10°C (51°F)	8 mm (0.3 inches)	73%	moderate
August Weather	11°C (52°F)	2 mm (0.1 inches)	64%	high
September Weather	15°C (60°F)	5 mm (0.2 inches)	58%	extreme
October Weather	19°C (66°F)	13 mm (0.5 inches)	53%	extreme
November Weather	21°C (70°F)	6 mm (0.2 inches)	42%	extreme
December Weather	23°C (74°F)	11 mm (0.5 inches)	44%	extreme