May weather forecast
Johannesburg, South Africa

May ushers in a significant transition in weather conditions in Johannesburg, as winter begins to encroach upon the city. Rainfall drops substantially this month, falling from 54mm (2.13") to a mere 13mm (0.51"), exemplifying the aridity of the coming winter months. Concurrently, a noticeable decrease in evening temperatures becomes a marked signature of the changing season. Despite shorter days, generous sunlit hours and mild temperatures during the day continue to offer ideal conditions for outdoor activities. Humidity levels also drop, contributing to the general aridity of the region in May.

Temperature

Johannesburg transitions into May recording an average high-temperature of a refreshing 18.9°C (66°F), closely aligning with the preceding month's temperature. An average low-temperature of 7.2°C (45°F) is noted in Johannesburg, South Africa, during the month of May.

Humidity

The average relative humidity in May in Johannesburg is 56%.

Rainfall

In Johannesburg, South Africa, in May, it is raining for 2.9 days, with typically 13mm (0.51") of accumulated precipitation. Throughout the year, there are 99.3 rainfall days, and 713mm (28.07") of precipitation is accumulated.

Daylight

The average length of the day in May in Johannesburg is 10h and 50min.
On the first day of the month, sunrise is at 06:31 and sunset at 17:37. On the last day of May, sunrise is at 06:47 and sunset at 17:23 SAST.

Sunshine

In Johannesburg, South Africa, the average sunshine in May is 8.9h.

UV index

In May, the average daily maximum UV index in Johannesburg, South Africa, is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 6 during May translates into these guidelines:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.