The Weather in Tonga: Month-by-Month

When you’re looking to escape to a tropical paradise, the weather is kind of important! Tonga is a tropical island archipelago with two seasons, yet never really experiences cold weather. Nevertheless, there are significant changes in rainfall and humidity throughout the year. So to answer the question: what is the weather like in Tonga? Check out our month-by-month guide!

The Seasons in Tonga

Tonga has a tropical climate with two distinct seasons:

  • Wet/summer season: December to April
  • Dry/winter season: May to November

Learn more about the seasons in Tonga, including the tourist seasons and the best seasons for certain activities, in What are the Seasons in Tonga?

January

What is the Weather Like in Tonga?

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The year gets off to a hot and humid start in Tonga, in the midst of the wet season. It’s also the cyclone season in the South Pacific, so it’s best to be aware of cyclone warnings – see our Tonga cyclone guide for more details. Otherwise, the country is vibrant with New Year and Chinese New Year (changeable) celebrations, particularly in Nuku’alofa.

January Weather in Tonga

Average temperature: 30°C/86°F in the day, 23°C/74°F at night
Average sea temperature: 28°C/82°F
Average rainfall: 174mm/6.9″
Daylight hours: 13 hours

For more in-depth information, see Tonga Weather in January.

February

What is the Weather Like in Tonga?

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It’s still the wet season in Tonga, with some of the heaviest rainfall experienced in February. Temperatures are warm and humid, but at least the days are long and there are still plenty of sunshine hours for those seeking some sun.

February Weather in Tonga

Average temperature: 31°C/88°F in the day, 24°C/75°F at night
Average sea temperature: 28°C/83°F
Average rainfall: 210mm/8.3″
Daylight hours: 13 hours

For more in-depth information, see Tonga Weather in February.

March

What is the Weather Like in Tonga?

(c) Pxhere

The wet season continues, with still the slight risk of cyclones developing. The northern groups of islands, like Vava’u and The Niues, experience their highest rainfall and temperatures of the year, while the middle islands of Ha’apai are not close behind.

March Weather in Tonga

Average temperature: 31°C/88°F in the day, 23°C/74°F at night
Average sea temperature: 28°C/83°F
Average rainfall: 206mm/8.1″
Daylight hours: 12 hours

For more in-depth information, see Tonga Weather in March.

April

Robin Blowholes Person Pointing Mandatory Credit To TongaPocketGuide.com Small

(c) tongapocketguide.com

April is the final month of the wet season, still bringing some “April showers” along with it. Temperatures steadily start to cool in the southern islands, such as Tongatapu and ‘Eua. It’s also the last month of the cyclone season. Humidity levels fall also, making it easier to breathe again!

April Weather in Tonga

Average temperature: 30°C/86°F in the day, 22°C/69°F at night
Average sea temperature: 28°C/82°F
Average rainfall: 165mm/6.5″
Daylight hours: 12 hours

For more in-depth information, see Tonga Weather in April.

May

What is the Weather Like in Tonga?

(c) Pixabay

May is the official start to the dry season, where temperatures start to get cooler and the humidity drops. There are fewer rain days but when it does rain, it’s usually heavy showers. The UV levels are also not quite as intense as in summer, averaging around 7 UV index at midday. May is a good time to visit “the Kingdom” before the tourist crowds arrive.

May Weather in Tonga

Average temperature: 30°C/86°F in the day, 20°C/68°F at night
Average sea temperature: 27°C/80°F
Average rainfall: 111mm/4.4″
Daylight hours: 11 hours

For more in-depth information, see Tonga Weather in May.

June

What is the Weather Like in Tonga?

(c) Pxhere.com

The dry season really kicks into gear with cooler and much drier days than what’s experienced in summer. June 4th is a public holiday, while the end of June is when the first Humpback Whales can be seen in Tonga’s waters for the calving and mating season. Sea temperatures are also dropping but still warm enough for a comfortable swim.

June Weather in Tonga

Average temperature: 29°C/84°F in the day, 20°C/67°F at night
Average sea temperature: 26°C/78°F
Average rainfall: 95mm/3.7″
Daylight hours: 11 hours

For more in-depth information, see Tonga Weather in June.

July

What is the Weather Like in Tonga?

(c) tongapocketguide.com

July is a popular time to be in Tonga, with the start of the whale swimming season and the weather becoming more and more appealing for those wishing to escape the cold winter of their own country. July 4th is a public holiday for the King’s birthday, while the only other reason shops and services will close down will be for the usual Sunday rules.

July Weather in Tonga

Average temperature: 29°C/84°F in the day, 18°C/65°F at night
Average sea temperature: 25°C/76°F
Average rainfall: 95mm/3.7″
Daylight hours: 11 hours

For more in-depth information, see Tonga Weather in July.

August

What is the Weather Like in Tonga?

(c) tongapocketguide.com

August is one of Tonga’s coolest months, which is still hot enough for travellers to enjoy a tropical and sunny getaway. But you’ll be thankful for bringing a light jacket for the cooler evenings or when darting between the islands by boat. The whale season is still going strong, while snorkelling and scuba diving is also a popular thing to do at this time of the year.

August Weather in Tonga

Average temperature: 29°C/84°F in the day, 18°C/65°F at night
Average sea temperature: 24°C/75°F
Average rainfall: 117mm/4.6″
Daylight hours: 11 hours

For more in-depth information, see Tonga Weather in August.

September

What is the Weather Like in Tonga?

(c) tongapocketguide.com

September is usually an ideal month for travellers in terms of the weather and the activities available in Tonga. The weather is warm but not too hot, mostly dry with usually 13 days of the month experiencing rain, and the whale season still going. It’s typically a little drier in Vava’u than it is in Tongatapu.

September Weather in Tonga

Average temperature: 29°C/84°F in the day, 19°C/66°F at night
Average sea temperature: 24°C/75°F
Average rainfall: 122mm/4.8″
Daylight hours: 12 hours

For more in-depth information, see Tonga Weather in September.

October

What is the Weather Like in Tonga?

(c) Pixabay

The whale season comes to an end in October, but it’s still idyllic weather for most travellers. Days are long and mostly dry, especially in the northern islands of Vava’u and the Ha’apai group. The sea temperatures rise slightly, making it a good time for snorkelling and diving.

October Weather in Tonga

Average temperature: 29°C/84°F in the day, 20°C/67°F at night
Average sea temperature: 25°C/78°F
Average rainfall: 128mm/5″
Daylight hours: 13 hours

For more in-depth information, see Tonga Weather in October.

November

What is the Weather Like in Tonga?

(c) Pixabay

November is the month where you can really feel the transition from the dry season to the wet season in Tonga. Days are getting hotter, it’s starting to get more humid, and the rain gets more frequent towards the end of the month. Nevertheless, it’s the tourist low season so it’s a good time to experience the last of the good weather before the wet season gets into full swing.

November Weather in Tonga

Average temperature: 30°C/86°F in the day, 21°C/70°F at night
Average sea temperature: 25°C/78°F
Average rainfall: 123mm/4.8″
Daylight hours: 13 hours

For more in-depth information, see Tonga Weather in November.

December

What is the Weather Like in Tonga?

(c) tongapocketguide.com

The wet season is well and truly here, where downpours are often heavy but short before the sun comes back out again. Travel schedules between the islands are often cancelled or rescheduled due to bad weather. It’s also the cyclone season, so it’s best to be aware of the cyclone and weather warnings. There are plenty of public holidays where the country shuts down for Christmas and New Year, as well as King Tupou I Commemoration Day on the 7th.

December Weather in Tonga

Average temperature: 30°C/86°F in the day, 22°C/73°F at night
Average sea temperature: 27°C/80°F
Average rainfall: 175mm/6.9″
Daylight hours: 13 hours

For more in-depth information, see Tonga Weather in December.

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What is the Weather Like in Tonga?