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

January 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
January in Johannesburg is the peak of summer, and the temperatures are the highest of the entire year.
The weather is hot, with an average humidity score of 69%. Expect high rain to fall for an average of fifteen days during the month to collect 127mm (5") on average. This is the highest rainfall received in the city throughout the year and is accompanied by thunderstorms in the afternoons. January is characterized by high temperatures ranging between 15°C (59°F) and 26°C (78.8°F) that warm the day with the sun shining up to nine hours a day. The evenings and nights, however, turn cooler.

What is the warmest month in Johannesburg?

The warmest month in Johannesburg is January, with an average high-temperature of 25.6°C (78.1°F) and an average low-temperature of 14.7°C (58.5°F).

What is the temperature in January in Johannesburg?

In January, the average high-temperature is 25.6°C (78.1°F), and the average low-temperature is 14.7°C (58.5°F).

What is the average humidity in January in Johannesburg?

In Johannesburg, the average relative humidity in January is 69%.

How much does it rain in Johannesburg in January?

In Johannesburg, South Africa, in January, it is raining for 15.9 days, with typically 125mm (4.9") of accumulated precipitation.

What is the rainiest month in Johannesburg?

The month with the most rainfall is January when the rain falls for 15.9 days and typically aggregates up to 125mm (4.9") of precipitation.

How many hours of daylight does Johannesburg have in January?

In January, the average length of the day in Johannesburg is 13.6h.

How many hours of sunshine does Johannesburg have in January?

The average sunshine in January in Johannesburg, South Africa, is 8.1h.

What is the month with the highest UV index in Johannesburg?

January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index.

How high is the UV index in January in Johannesburg?

In January, the average daily maximum UV index in Johannesburg, South Africa, is 12. A UV Index reading of 11, and higher, represents an extreme health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in January - Johannesburg, South Africa
  • Average high temperature in January: 25.6°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 January: 14.7°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 January - Johannesburg, South Africa
  • Average humidity in January: 69%

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

Average rainfall in January - Johannesburg, South Africa
  • Average rainfall in January: 125mm

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

Average rainfall days in January - Johannesburg, South Africa
  • Average rainfall days in January: 15.9 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 January / Average sunshine in January - Johannesburg, South Africa
  • Average daylight in January: 13.6h

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 January: 8.1h

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 January - Johannesburg, South Africa
  • Average UV index in January: 12

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).