Tonga weather in September 2025

Expect 25°C daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in Tonga in September. Check more long-term weather averages for Tonga in September before you book your next holiday to Tonga in 2025/2026.

  • 25°C maximum daytime temperature in September in Tonga (Nuku'alofa)25
    25°C max day temperature
  • 4 days with some rainfall in September in Tonga (Nuku'alofa)4
    4 days with some rainfall
  • 20°C minimum night-time temperature in September in Tonga (Nuku'alofa)20
    20°C min night temperature
  • 12 hours of daylight per day in September in Tonga (Nuku'alofa)12
    12 hours of daylight per day
  • Low heat & humidity in September in Tonga (Nuku'alofa)L
    Low heat & humidity
  • 114 mm monthly rainfall in September in Tonga (Nuku'alofa)114
    114 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in September in Tonga (Nuku'alofa)10
    10 (Very High) UV index
  • 23°C sea temperature in September in Tonga (Nuku'alofa)23
    23°C sea temperature

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The September weather guide for Tonga (Nuku'alofa) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Top Tonga destinations

Below are average maximum temperatures at popular countries, regions and places in Tonga in September. Select a holiday destination to see more weather parameters.

All Tonga destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Tonga in September?

Daytime temperatures usually reach 25°C in Nuku'alofa, Tonga in September with low heat and humidity, falling to 20°C at night.

How warm is the sea around Tonga in September?

The average sea temperature around Nuku'alofa, Tonga in September is 23°C.

Does it rain in Tonga in September?

There are usually 4 days with some rain in Nuku'alofa, Tonga in September and the average monthly rainfall is 114mm.

Tonga September sunrise & sunset times

Browse the sunrise and sunset times for Tonga in September 2025. Select a month to view Tonga sunrise and sunset times for the next 12 months. The Tonga sunrise and sunset times shown below are for Nuku'alofa.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:50 18:32
Monday, 15th September 2025 06:38 18:35
Tuesday, 30th September 2025 06:23 18:39

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