Johannesburg
South Africa
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Johannesburg, South Africa

The vast cityscape of Gauteng Province in Johannesburg, South Africa
The vast cityscape of Gauteng Province in Johannesburg, South Africa
September comes with spring and is characterized by warmer temperatures between 9°C (48.2°F) and 22°C (71.6°F) and a humidity average of 49%.
The rains begin to return and fall for an average of four days all month, with the rain gauge collecting approximately 40.6mm (1.6"). Expect light episodes of lightning and thunderstorms to accompany the rains occasionally. The sunshine hours are steady at eleven, meaning warmer days throughout the month.

What is the temperature in September in Johannesburg?

The average high-temperature, in September, in Johannesburg, South Africa, is 22.8°C (73°F), while the average low-temperature is 9.3°C (48.7°F).

What is the average humidity in September in Johannesburg?

In September, the average relative humidity is 47%.

How many days does it rain in September in Johannesburg?

In Johannesburg, in September, during 3.8 rainfall days, 27mm (1.1") of precipitation is typically accumulated.

What is the average length of the day in September in Johannesburg?

In September, the average length of the day is 12h.

What month has the most sunshine in Johannesburg?

The month with the most sunshine in Johannesburg, South Africa, is September, with an average of 9.4h of sunshine.

How many hours of sunshine does Johannesburg have in September?

In Johannesburg, the average sunshine in September is 9.4h.

What is the UV index reading in September in Johannesburg?

In September, the average daily maximum UV index is 9. A UV Index reading of 8 to 10 represents a very high health threat from unsafe exposure to the Sun's UV rays.
Average temperature in September - Johannesburg, South Africa
  • Average high temperature in September: 22.8°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 September: 9.3°C

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

Average humidity in September - Johannesburg, South Africa
  • Average humidity in September: 47%

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

Average rainfall in September - Johannesburg, South Africa
  • Average rainfall in September: 27mm

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

Average rainfall days in September - Johannesburg, South Africa
  • Average rainfall days in September: 3.8 days

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

Average daylight in September / Average sunshine in September - Johannesburg, South Africa
  • Average daylight in September: 12h

The month with the longest days is December (Average daylight: 13.8h).
The month with shortest days is June (Average daylight: 10.5h).

  • Average sunshine in September: 9.4h

The month with most sunshine is September (Average sunshine: 9.4h).
The month with least sunshine is March (Average sunshine: 7.7h).

Average UV index in September - Johannesburg, South Africa
  • Average UV index in September: 9

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