Sydney
Australia
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Sydney, Australia

The landmarks of the city of Sydney, Australia viewed from above the vast Parramatta River
The landmarks of the city of Sydney, Australia viewed from above the vast Parramatta River
January, like December, in Sydney, Australia, is another warm summer month, with average temperature fluctuating between 18.7°C (65.7°F) and 25.9°C (78.6°F).

Temperature

The warmest month is January, with an average high-temperature of 25.9°C (78.6°F) and an average low-temperature of 18.7°C (65.7°F).

Humidity

In Sydney, Australia, the average relative humidity in January is 62%.

Rainfall

In Sydney, during January, the rain falls for 12.2 days and regularly aggregates up to 101.6mm (4") of precipitation. Throughout the year, there are 143.4 rainfall days, and 1212.1mm (47.7") of precipitation is accumulated.

Sea temperature

In Sydney, the average seawater temperature in January is 23.3°C (73.9°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.3°C (73.9°F) water. (FYI: The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).)

Daylight

In Sydney, the average length of the day is 14.1h.

Sunshine

In January, the average sunshine in Sydney is 7.6h.

UV index

January and December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index of 11, and more, symbolizes an excessive health risk from the exposure to the Sun's UV rays for the ordinary person.
The average daily UV index of 12 in January transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Prolonged stay under the direct sun should be avoided as much as possible, especially if a person burns easily. Sunscreen with a minimum 30 sun protection factor should always be used. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the warmest month in Sydney?

January is the warmest month in Sydney, with an average high-temperature of 25.9°C (78.6°F) and an average low-temperature of 18.7°C (65.7°F).

What is the temperature in January in Sydney?

In January, the average high-temperature is 25.9°C (78.6°F), and the average low-temperature is 18.7°C (65.7°F).

What is the average humidity in January in Sydney?

The average relative humidity in January in Sydney, Australia, is 62%.

How many days does it rain in January in Sydney?

In Sydney, during January, the rain falls for 12.2 days and regularly aggregates up to 101.6mm (4") of precipitation.

What is the water temperature in January in Sydney?

In Sydney, the average seawater temperature in January is 23.3°C (73.9°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 23.3°C (73.9°F) water may be enjoyable.

What is the average length of the day in January in Sydney?

The average length of the day in January in Sydney is 14.1h.

How many hours of sunshine does Sydney have in January?

The average sunshine in January is 7.6h.

When is the highest UV index in Sydney?

Months with the highest UV index in Sydney are January and December, with an average maximum UV index of 12.

How high is the UV index in January in Sydney?

In Sydney, the average daily maximum UV index in January is 12. A UV Index reading of 11, and higher, represents an excessive health risk from unprotected exposure to the UV radiation.
Average temperature in January - Sydney, Australia
  • Average high temperature in January: 25.9°C

The warmest month (with the highest average high temperature) is January (25.9°C).
The month with the lowest average high temperature is July (16.3°C).

  • Average low temperature in January: 18.7°C

The month with the highest average low temperature is February (18.8°C).
The coldest month (with the lowest average low temperature) is July (8.1°C).

Average humidity in January - Sydney, Australia
  • Average humidity in January: 62%

The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (49%).

Average rainfall in January - Sydney, Australia
  • Average rainfall in January: 101.6mm

The wettest month (with the highest rainfall) is June (131.9mm).
The driest month (with the lowest rainfall) is September (68.3mm).

Average rainfall days in January - Sydney, Australia
  • Average rainfall days in January: 12.2 days

The month with the highest number of rainy days is March (13.6 days).
The month with the lowest number of rainy days is August (10.4 days).

Average sea temperature in January - Sydney, Australia
  • Average sea temperature in January: 23.3°C

The best month for swimming (with the highest average sea temperature) is February (23.7°C).
The coldest month (with the lowest average sea temperature) is September (18.6°C).

Average daylight in January / Average sunshine in January - Sydney, Australia
  • Average daylight in January: 14.1h

The month with the longest days is December (Average daylight: 14.4h).
The month with shortest days is June (Average daylight: 9.9h).

  • Average sunshine in January: 7.6h

Months with most sunshine are August, September, October and December (Average sunshine: 7.9h).
The month with least sunshine is June (Average sunshine: 5.9h).

Average UV index in January - Sydney, Australia
  • Average UV index in January: 12

Months with the highest UV index are January and December (UV index 12).
The month with the lowest UV index is June (UV index 2).