August weather forecast
Johannesburg, South Africa

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The vast cityscape of Gauteng Province in Johannesburg, South Africa
The vast cityscape of Gauteng Province in Johannesburg, South Africa

Weather in August

August in Johannesburg signals the end of the winter season and the onset of spring. The return of slightly milder weather begins with a gradual increase in temperatures. With an insignificant increase in rainfall to 6mm (0.24"), the weather continues to stay predominantly dry and clear. Augmenting daylight hours hint at the incoming spring season, promising longer, sunny days ahead. Despite the increased UV index, the conditions remain perfect to enjoy the natural beauty of Johannesburg's blooming spring season.

Temperature

Johannesburg experiences an average high-temperature of a still refreshing 19.4°C (66.9°F) in August, marking an insignificant shift from 16.7°C (62.1°F) in July. In August, a remarkable difference from daytime highs is noted, as Johannesburg records an average temperature of 6.2°C (43.2°F) during the night.

Humidity

The least humid month in Johannesburg is August, with an average relative humidity of 46%.

Rainfall

In Johannesburg, in August, it is raining for 2.1 days, with typically 6mm (0.24") of accumulated precipitation. In Johannesburg, during the entire year, the rain falls for 99.3 days and collects up to 713mm (28.07") of precipitation.

Daylight

In August, the average length of the day in Johannesburg is 11h and 13min.
On the first day of the month, sunrise is at 06:46 and sunset at 17:41. On the last day of August, in Johannesburg, sunrise is at 06:20 and sunset at 17:55 SAST.

Sunshine

In Johannesburg, the average sunshine in August is 9.2h.

UV index

In August, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 7 in August translates into this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Stay sun-safe with clothing that is both closely woven and worn loosely.

Frequently asked questions

What is the usual temperature for Johannesburg in August?

The high-temperature, in August, in Johannesburg, is 19.4°C (66.9°F), while the low-temperature averages to 6.2°C (43.2°F).

What is the least humid month in Johannesburg?

With an average relative humidity of 46%, August is the least humid month in Johannesburg.

What is the average humidity in August in Johannesburg?

In Johannesburg, South Africa, the average relative humidity in August is 46%.

How much does it rain in Johannesburg in August?

In Johannesburg, South Africa, during August, the rain falls for 2.1 days and regularly aggregates up to 6mm (0.24") of precipitation.

How many hours of daylight does Johannesburg have in August?

In August, the average day length in Johannesburg is 11h and 13min.

What time are sunrise and sunset in August in Johannesburg?

On the first day of August in Johannesburg, South Africa, sunrise is at 06:46 and sunset at 17:41. On the last day of the month, sunrise is at 06:20 and sunset at 17:55 SAST.

How many hours of sunshine does Johannesburg have in August?

In August, the average sunshine duration in Johannesburg is 9.2h.

How high is the UV index in August in Johannesburg?

The average daily maximum UV index in August in Johannesburg is 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in August
Johannesburg, South Africa

Average temperature in August - Johannesburg, South Africa
  • Average high temperature in August: 19.4°C

The warmest month (with the highest average high temperature) is January (25.6°C).
The month with the lowest average high temperature is June (16°C).

  • Average low temperature in August: 6.2°C

The month with the highest average low temperature is January (14.7°C).
The coldest months (with the lowest average low temperature) are June and July (4.1°C).

Average humidity in August
Johannesburg, South Africa

Average humidity in August - Johannesburg, South Africa
  • Average humidity in August: 46%

The month with the highest relative humidity is February (70%).
The month with the lowest relative humidity is August (46%).

Average rainfall in August
Johannesburg, South Africa

Average rainfall in August - Johannesburg, South Africa
  • Average rainfall in August: 6mm

The wettest month (with the highest rainfall) is January (125mm).
The driest month (with the least rainfall) is July (4mm).

Average rainfall days in August
Johannesburg, South Africa

Average rainfall days in August - Johannesburg, South Africa
  • Average rainfall days in August: 2.1 days

The month with the highest number of rainy days is January (15.9 days).
The month with the least rainy days is July (1 days).

Average daylight in August /
Average sunshine in August
Johannesburg, South Africa

Average daylight in August / Average sunshine in August - Johannesburg, South Africa
  • Average daylight in August: 11h and 1min

The month with the longest days is December (Average daylight: 13h and 48min).
The month with the shortest days is June (Average daylight: 10h and 30min).

  • Average sunshine in August: 9h and 1min

The month with the most sunshine is September (Average sunshine: 9h and 24min).
The month with the least sunshine is March (Average sunshine: 7h and 42min).

Average UV index in August
Johannesburg, South Africa

Average UV index in August - Johannesburg, South Africa
  • Average UV index in August: 7

The months with the highest UV index are January, February, March, November and December (UV index 12).
The months with the lowest UV index are June and July (UV index 5).

Johannesburg, South Africa

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