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

September 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
The first month of the spring, September, is also a moderately hot month in Nuku'alofa, Tonga, with average temperature varying between 25.3°C (77.5°F) and 18.6°C (65.5°F).

Temperature

In September, the average high-temperature is almost the same as in August - a still warm 25.3°C (77.5°F). In Nuku'alofa, Tonga, in September, the average low-temperature is 18.6°C (65.5°F).

Humidity

In September, the average relative humidity in Nuku'alofa is 74%.

Rainfall

In Nuku'alofa, in September, it is raining for 13 days, with typically 122mm (4.8") of accumulated precipitation. In Nuku'alofa, during the entire year, the rain falls for 180 days and collects up to 1721mm (67.8") of precipitation.

Sea temperature

August and September, with an average sea temperature of 23.8°C (74.8°F), are months with the coldest seawater in Nuku'alofa. Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 23.8°C (74.8°F) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 25°C (77°F) to 28°C (82.4°F).)

Daylight

The average length of the day in Nuku'alofa is 12h.

Sunshine

In September, the average sunshine is 4h.

UV index

In September, the average daily maximum UV index is 10. A UV Index estimate of 8 to 10 represents a very high threat to health from the exposure to the Sun's UV radiation for the ordinary person.
In September, the average maximum UV index of 10 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in Nuku'alofa?

In September, in Nuku'alofa, the average high-temperature is 25.3°C (77.5°F), and the average low-temperature is 18.6°C (65.5°F).

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

In Nuku'alofa, the average relative humidity in September is 74%.

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

In Nuku'alofa, Tonga, during September, the rain falls for 13 days and regularly aggregates up to 122mm (4.8") of precipitation.

What are the months with the coldest sea water in Nuku'alofa?

August and September, with an average sea temperature of 23.8°C (74.8°F), are months with the coldest seawater. A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.8°C (74.8°F) water.

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

In September, the average sea temperature in Nuku'alofa is 23.8°C (74.8°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23.8°C (74.8°F) water.

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

The average length of the day in September in Nuku'alofa, Tonga, is 12h.

How long on average sun shines in September in Nuku'alofa?

In September, the average sunshine in Nuku'alofa, Tonga, is 4h.

What is the UV index reading in September in Nuku'alofa?

In Nuku'alofa, the average daily maximum UV index in September is 10. A UV Index value of 8 to 10 symbolizes a very high health threat from the exposure to the Sun's UV radiation.
Average temperature in September - Nuku
  • Average high temperature in September: 25.3°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 September: 18.6°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 September - Nuku
  • Average humidity in September: 74%

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

Average rainfall in September - Nuku
  • Average rainfall in September: 122mm

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 September - Nuku
  • Average rainfall days in September: 13 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 September - Nuku
  • Average sea temperature in September: 23.8°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 September / Average sunshine in September - Nuku
  • Average daylight in September: 12h

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 September: 4h

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 September - Nuku
  • Average UV index in September: 10

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).