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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.
- 2525°C max day temperature
- 44 days with some rainfall
- 2020°C min night temperature
- 1212 hours of daylight per day
- LLow heat & humidity
- 114114 mm of monthly rainfall
- 1010 (Very High) UV index
- 2323°C sea temperature
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Recommended for Tonga
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)
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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