Nuku'alofa
Tonga
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Nuku'alofa, Tonga

A view of the Rugged scenic shores of Nuku
A view of the Rugged scenic shores of Nuku'alofa in Tonga, with a beautiful clear waterfront
January, like December, in Nuku'alofa, Tonga, is another warm summer month, with temperature in the range of an average low of 23.4°C (74.1°F) and an average high of 29.4°C (84.9°F).

Temperature

In January, the average high-temperature is essentially the same as in December - a still warm 29.4°C (84.9°F). The average low-temperature, in Nuku'alofa, is 23.4°C (74.1°F).

Heat index

In January, the average heat index is evaluated at a very hot 35.2°C (95.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (pregnancy, clothing, metabolic differences). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity is 77%.

Rainfall

In January, the rain falls for 17 days. Throughout January, 174mm (6.9") of precipitation is accumulated. Throughout the year, in Nuku'alofa, there are 180 rainfall days, and 1721mm (67.8") of precipitation is accumulated.

Sea temperature

In Nuku'alofa, Tonga, the average seawater temperature is 27.7°C (81.9°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in January is 13.2h.

Sunshine

January and March, with an average of 18h of sunshine, are months with the most sunshine in Nuku'alofa.

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 value of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
Note: 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in January in Nuku'alofa?

The average high-temperature, in January, in Nuku'alofa, is 29.4°C (84.9°F), while the average low-temperature is 23.4°C (74.1°F). In January, the average heat index (a.k.a. 'felt air temperature', 'feels like'), that combines both air temperature and relative humidity, is estimated at 35.2°C (95.4°F).

What is the average humidity in January in Nuku'alofa?

In Nuku'alofa, Tonga, the average relative humidity in January is 77%.

How much does it rain in Nuku'alofa in January?

In Nuku'alofa, in January, it is raining for 17 days, with typically 174mm (6.9") of accumulated precipitation.

What is the water temperature in January in Nuku'alofa?

In Nuku'alofa, Tonga, the average seawater temperature in January is 27.7°C (81.9°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Nuku'alofa have in January?

The average length of the day in January is 13.2h.

What are the months with the most sunshine in Nuku'alofa?

January and March, with an average of 18h of sunshine, are months with the most sunshine in Nuku'alofa.

How many hours of sunshine does Nuku'alofa have in January?

The average sunshine in January is 18h.

What are the months with the highest UV index in Nuku'alofa?

Months with the highest UV index in Nuku'alofa are January through March, November and December, with an average maximum UV index of 12.

What is the UV index intensity in January in Nuku'alofa?

In January, the average daily maximum UV index in Nuku'alofa, Tonga, is 12. A UV Index value of 11, and more, symbolizes an extreme health threat from the exposure to the Sun's UV rays.
Average temperature in January - Nuku
  • Average high temperature in January: 29.4°C

The warmest month (with the highest average high temperature) is February (29.9°C).
The month with the lowest average high temperature is August (24.8°C).

  • Average low temperature in January: 23.4°C

The month with the highest average low temperature is February (23.7°C).
The coldest month (with the lowest average low temperature) is July (18.1°C).

Average humidity in January - Nuku
  • Average humidity in January: 77%

The month with the highest relative humidity is March (79%).
The month with the lowest relative humidity is November (73%).

Average rainfall in January - Nuku
  • Average rainfall in January: 174mm

The wettest month (with the highest rainfall) is February (210mm).
Driest months (with the lowest rainfall) are June and July (95mm).

Average rainfall days in January - Nuku
  • Average rainfall days in January: 17 days

Months with the highest number of rainy days are February and March (19 days).
The month with the lowest number of rainy days is October (11 days).

Average sea temperature in January - Nuku
  • Average sea temperature in January: 27.7°C

The best month for swimming (with the highest average sea temperature) is March (28.1°C).
Coldest months (with the lowest average sea temperature) are August and September (23.8°C).

Average daylight in January / Average sunshine in January - Nuku
  • Average daylight in January: 13.2h

The month with the longest days is December (Average daylight: 13.4h).
The month with shortest days is June (Average daylight: 10.9h).

  • Average sunshine in January: 18h

Months with most sunshine are January and March (Average sunshine: 18h).
The month with least sunshine is August (Average sunshine: 3h).

Average UV index in January - Nuku
  • 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 6).