January weather forecast
Nuku'alofa, Tonga

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The Rugged scenic shores of Nuku
The Rugged scenic shores of Nuku'alofa in Tonga, with a beautiful clear waterfront

Weather in January

January invites locals and visitors alike to enjoy its warm climate in Nuku'alofa, Tonga. The temperature often fluctuates between a high of 29.4°C (84.9°F) and a low of 23.4°C (74.1°F). The shift to February bears minimal change in temperature but more distinct alterations could be felt in terms of precipitation. January stands out with the most sum of sunshine hours. Humidity and UV index also remain relatively high, necessitating ample hydration and sun protection.

Temperature

Nuku'alofa's weather, upon January's arrival, documents an average high-temperature of a still moderately hot 29.4°C (84.9°F), nearly identical to the prior month. In the month of January, Nuku'alofa experiences an average low-temperature of 23.4°C (74.1°F).

Heat index

In January, the average heat index is appraised at a torrid 35°C (95°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Research indicates the heat index considers values in shaded locales and with light winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', determines the feeling of heat when you account for the relative humidity. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

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

Rainfall

In January, the rain falls for 17 days. Throughout January, 174mm (6.85") of precipitation is accumulated. Throughout the year, there are 180 rainfall days, and 1721mm (67.76") of precipitation is accumulated.

Sea temperature

In January, the average sea temperature is 27.7°C (81.9°F).
Note: For activities such as swimming and diving, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as particularly pleasant and satisfying for prolonged periods without feeling uneasy.

Daylight

In Nuku'alofa, the average length of the day in January is 13h and 14min.
On the first day of January in Nuku'alofa, sunrise is at 06:02 and sunset at 19:26. On the last day of the month, sunrise is at 06:22 and sunset at 19:25 +13.

Sunshine

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

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 of 11, and more, symbolizes an extreme health hazard from exposure to the Sun's UV rays for the average person.
Note: In January, the maximum UV index of 12 suggests these recommendations:
Employ every precaution of importance, unprotected skin and eyes could burn within moments. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Regardless of cloud cover, it's recommended to apply generously and reapply often a sunscreen with an SPF of at least 30, especially after swimming or any outdoor activity. Be mindful! Sand and water reflections can up the Sun's UV exposure.

Frequently asked questions

Is it hot during January?

An average high-temperature, in January, in Nuku'alofa, is 29.4°C (84.9°F) and the average low-temperature is 23.4°C (74.1°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in January is appraised at 35°C (95°F).

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

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

How many days does it rain in January?

In Nuku'alofa, during January, the rain falls for 17 days and regularly aggregates up to 174mm (6.85") of precipitation.

How warm is the water in January?

In January, the average sea temperature in Nuku'alofa 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?

In Nuku'alofa, the average day length in January is 13h and 14min.

What time are sunrise and sunset in January?

In January, on the first day of the month, sunrise is at 06:02 and sunset at 19:26. On the last day of the month, sunrise is at 06:22 and sunset at 19:25 +13.

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.

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

In Nuku'alofa, the average sunshine duration in January is 18h.

When is the highest UV index?

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 Nuku'alofa, the average daily maximum UV index in January is 12. A UV Index reading of 11, and higher, represents an ultimate hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in January
Nuku'alofa, Tonga

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'alofa, Tonga

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'alofa, Tonga

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

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

Average rainfall days in January
Nuku'alofa, Tonga

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

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

Average sea temperature in January
Nuku'alofa, Tonga

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).
The coldest months (with the lowest average sea temperature) are August and September (23.8°C).

Average daylight in January /
Average sunshine in January
Nuku'alofa, Tonga

Average daylight in January / Average sunshine in January - Nuku
  • Average daylight in January: 13h and 1min

The month with the longest days is December (Average daylight: 13h and 24min).
The month with the shortest days is June (Average daylight: 10h and 54min).

  • Average sunshine in January: 18h

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

Average UV index in January
Nuku'alofa, Tonga

Average UV index in January - Nuku
  • 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 6).

Nuku'alofa, Tonga

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