The vast cityscape of Gauteng Province in Johannesburg, South Africa
Weather in January
January in Johannesburg, South Africa, experiences summer to its fullest, with the highest UV index of 12 throughout the year. Humidity levels show a significant increase this month, resulting in mornings filled with dew. Visitors and locals can expect intermittent rainfall, a common feature of summer months in Africa, creating a pleasant coolness in the afternoon hours. Despite the occasional rainfall, January serves up plenty of sunshine and warm temperatures. Consequently, the city receives the highest average monthly rainfall, with precipitation reaching up to 125mm (4.92").
On the first day of January, sunrise is at 05:18 and sunset at 19:03. On the last day of the month, sunrise is at 05:41 and sunset at 19:00 SAST.
Note: A maximum UV index of 12 in January translates into the following recommendations:
Put into effect every essential safeguard, as unprotected skin and eyes might burn instantly. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
[Resources]Temperature
January registers as the month with the highest average temperatures, reaching 25.6°C (78.1°F) at its peak and 14.7°C (58.5°F) at the lowest.Humidity
In Johannesburg, the average relative humidity in January is 69%.Rainfall
January is the month with the most rainfall. Rain falls for 15.9 days and accumulates 125mm (4.92") of precipitation.Daylight
In January, the average length of the day in Johannesburg, South Africa, is 13h and 34min.On the first day of January, sunrise is at 05:18 and sunset at 19:03. On the last day of the month, sunrise is at 05:41 and sunset at 19:00 SAST.
Sunshine
In Johannesburg, the average sunshine in January is 8.1h.UV index
January through March, November and December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an extreme health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum UV index of 12 in January translates into the following recommendations:
Put into effect every essential safeguard, as unprotected skin and eyes might burn instantly. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Frequently asked questions
What is the hottest time of year in Johannesburg?
January, recognised by an average high temperature of 25.6°C (78.1°F) and a low of 14.7°C (58.5°F), is Johannesburg's warmest month.
What is the temperature in January in Johannesburg?
During January, Johannesburg experiences an average high-temperature of 25.6°C (78.1°F) and a low-temperature of 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%.
What is the rainiest month in Johannesburg?
January is the month with the most rainfall. Rain falls for 15.9 days and accumulates 125mm (4.92") of precipitation.
How many days does it rain in January in Johannesburg?
In Johannesburg, South Africa, in January, during 15.9 rainfall days, 125mm (4.92") of precipitation is typically accumulated.
How many hours of daylight does Johannesburg have in January?
In Johannesburg, the average day length in January is 13h and 34min.
What time are sunrise and sunset in January in Johannesburg?
On the first day of January in Johannesburg, South Africa, sunrise is at 05:18 and sunset at 19:03. On the last day of the month, sunrise is at 05:41 and sunset at 19:00 SAST.
How many hours of sunshine does Johannesburg have in January?
In Johannesburg, South Africa, the average sunshine duration in January is 8.1h.
What are the months with the highest UV index in Johannesburg?
The months with the highest UV index are January through March, November and December, with an average maximum UV index of 12.
What is the UV index reading in January in Johannesburg?
In January, the average daily maximum UV index in Johannesburg, South Africa, is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from 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).
The 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 least 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 least rainy days is July (1 days).
Average daylight in January /
Average sunshine in January
Johannesburg, South Africa
- Average daylight in January: 13h and 4min
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 January: 8h 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 January
Johannesburg, South Africa
- Average UV index in January: 12
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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