Tonga weather

Our guide to the weather in Tonga during September

24

Average high

6

UV Index

105mm

Monthly rainfall

78%

Humidity

We've looked at the most up-to-date weather data for Tonga, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Tonga weather in September.

How warm is it in Tonga during September?

The temperature is extremely stable in September with average highs of 24℃ and lows just 1℃ lower at 23℃. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.

Does it rain in Tonga during September?

On average, there will be 4 rainy days during the month, amounting to 104.7mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Tonga during September?

Expect moderate breeze becoming stronger at times during September, with occasional gusts up to 21mph. With warm air temperatures and high humidity, any breeze will feel warm but refreshing.

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Weather in Tonga

Our month-by-month guide to the weather and climate in Tonga

27.4

Tonga weather in

January
27.7

Tonga weather in

February
27.6

Tonga weather in

March
26.8

Tonga weather in

April
25.8

Tonga weather in

May
24.9

Tonga weather in

June
24.1

Tonga weather in

July
23.7

Tonga weather in

August
24.0

Tonga weather in

September
24.7

Tonga weather in

October
25.4

Tonga weather in

November
26.5

Tonga weather in

December