Johannesburg Weather in August
South Africa · Subtropical Highlands climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
August in Johannesburg sees average temperatures ranging from a low of 6.2°C (43.2°F) to a high of 20.4°C (68.7°F), with a mean of 12.9°C (55.2°F). Compared to the annual average of 16.0°C (60.8°F), this month is 3.1°C cooler than the yearly norm. Precipitation averages 3.0mm, making it approximately 50.0mm drier than the monthly average of 54.0mm. The city receives an average of 10.6 hours of sunshine per day during August, with relative humidity averaging 41.3%. Wind speeds reach an average maximum of 20.2 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.
August vs Adjacent Months
| Metric | July | August | September |
|---|---|---|---|
| Mean Temp | 9.8°C (49.6°F) | 12.9°C (55.2°F) | 17.1°C (62.8°F) |
| Rainfall | 0.8mm | 3.0mm | 12.6mm |
| Sunshine | 10.2 hrs | 10.6 hrs | 11.2 hrs |
| Humidity | 44.1% | 41.3% | 40.2% |
| Wind | 17.9 km/h | 20.2 km/h | 21.3 km/h |
| Rainy Days | 1.6 | 2.4 | 5.2 |
Seasonal Context
August falls in Summer in the Northern Hemisphere. Summer brings the warmest conditions of the year with the longest daylight hours. For travelers visiting Johannesburg in August, 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 August?
The average temperature in Johannesburg during August ranges from 6.2°C (43.2°F) to 20.4°C (68.7°F), with a mean of 12.9°C (55.2°F).
How much does it rain in Johannesburg in August?
Johannesburg receives an average of 3.0mm of precipitation in August, spread across approximately 2.4 rainy days.
What should I pack for Johannesburg in August?
Based on August weather data, pack warm layers, a medium jacket, and waterproof outerwear.
Is August a good time to visit Johannesburg?
August 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 August 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.