Johannesburg Weather in May
South Africa · Subtropical Highlands climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
May in Johannesburg sees average temperatures ranging from a low of 7.3°C (45.1°F) to a high of 19.7°C (67.5°F), with a mean of 13.0°C (55.4°F). Compared to the annual average of 16.0°C (60.8°F), this month is 3.0°C cooler than the yearly norm. Precipitation averages 17.1mm, making it approximately 36.0mm drier than the monthly average of 54.0mm. The city receives an average of 10.0 hours of sunshine per day during May, with relative humidity averaging 55.4%. Wind speeds reach an average maximum of 15.5 km/h. For travelers, this month offers a temperature experience in Johannesburg, with drier-than-average conditions compared to the rest of the year.
Johannesburg's altitude of 1,753 meters creates a subtropical highland climate with comfortable temperatures and summer rainfall. I've studied the data and found that the city experiences mild, dry winters and warm, wet summers. The best time for visiting is May to September, when the weather is dry and the city's outdoor attractions are most accessible.
May vs Adjacent Months
| Metric | April | May | June |
|---|---|---|---|
| Mean Temp | 15.3°C (59.5°F) | 13.0°C (55.4°F) | 9.8°C (49.6°F) |
| Rainfall | 72.7mm | 17.1mm | 12.8mm |
| Sunshine | 10.1 hrs | 10.0 hrs | 9.8 hrs |
| Humidity | 63.7% | 55.4% | 52.3% |
| Wind | 16.7 km/h | 15.5 km/h | 17.2 km/h |
| Rainy Days | 11.0 | 5.0 | 3.0 |
| Snowfall | 0.0 cm | 0.0 cm | 0.1 cm |
Seasonal Context
May falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Johannesburg in May, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Johannesburg in May?
The average temperature in Johannesburg during May ranges from 7.3°C (45.1°F) to 19.7°C (67.5°F), with a mean of 13.0°C (55.4°F).
How much does it rain in Johannesburg in May?
Johannesburg receives an average of 17.1mm of precipitation in May, spread across approximately 5.0 rainy days.
What should I pack for Johannesburg in May?
Based on May weather data, pack warm layers, a medium jacket, and waterproof outerwear.
Is May a good time to visit Johannesburg?
May is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Johannesburg
Cities with Similar May Climate (Subtropical Highlands)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -26.2°, 28.05°. Timezone: Africa/Johannesburg. Last updated: 2026-07-30.