Weather in Johannesburg in May 2025
Average weather
Average temperature in Johannesburg in May
Going from a maximum of +25°C during the day to a minimum of +3°C during the night, the temperature in May averages around +20°C.
The average maximum temperature goes down 23% by the end of the month, compared with the beginning of the month, from +20°C to +15°C.
Is Johannesburg warm or cold in May?
Johannesburg is typically mild in May.
Maximum temperatures go down compared to the previous month from +21°C to +19°C. The minimum temperature also goes down from +10°C to +6°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
May is one of the coolest months in Johannesburg, here is the comparison with other months:
Climate in Johannesburg in May
| April | May | June | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +21°C | +19°C | +17°C | ||||
| Min. temperature | ||||||
| 0°C | -3°C | -5°C | ||||
| Max. temperature | ||||||
| +29°C | +27°C | +25°C | ||||
| Rainfall | ||||||
| 51 mm | 18 mm | 10 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 68% | 61% | 59% | ||||
| Air pressure | ||||||
| 1019 HPa | 1021 HPa | 1023 HPa | ||||
| Sunny days | ||||||
| 11 | 19 | 22 | ||||
| Cloudy days | ||||||
| 6 | 6 | 5 | ||||
| Rainy days | ||||||
| 13 | 5 | 3 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
May often has better weather than April. It’s getting colder in May. From +21°C in the day, the average maximum temperature lowers to +19°C. As May arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 51 mm to 18 mm. It feels drier, as humidity decreases from 68% to 61%. The average wind speed doesn’t change much during May, staying around 1 m/s. The good news is there are likely to be more sunny days in May, from 11 to 19.
June brings much the same weather, it remains great.
Wind
The average wind speed is 1 m/s getting up to 2 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Johannesburg is gradually increasing during May, going from 1 m/s to 2 m/s over the course of the month.
Rain
How was the weather last May in Johannesburg?
Climate Change over Years
The climate in Johannesburg in May has not changed much over the last 43 years.
The average temperature was the lowest in 2000 (+20°C) and the highest in 2015 (+25°C). The driest year was 2015 with only 464 mm of rainfall, and the wettest year was 2022 with 1539 mm.
FAQ
Is May a good time to visit Johannesburg?
Can you sunbathe in Johannesburg in May?
Is Johannesburg rainy in May?
Is it sunny in Johannesburg in May?
Other cities in South Africa
Monthly weather in Johannesburg
Source of the data
For this page, we’ve looked at the typical weather in Johannesburg, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.