The highest day temperature in May 2025 was 75°F. The lowest night temperature was 40°F. The average values for day and night temperatures during May were 67.6°F и 55.1°F respectivly.

Almost all days in May are sunny. There is very low probability of clouds or gloomy days.

Precipitation total in May for Johannesburg is 0.3 in.

The average wind speed in May is 5.2 mph. It makes May the most windless month of the year for Johannesburg.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Johannesburg in May is 10.0 hours.