September · Tonga
Best time to visit Ha'apai in September Weather, crowds & prices
Weather in Ha'apai in September
Average temperature 23°C, 67 mm of rain, about 27 days with 6+ hours of sunshine and 76% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.1/10
Ranked #1 of 12 months
- Avg temp
- 23°C
- Rainfall
- 67 mm
- Humidity
- 76%
- Days with 6h+ sun
- 27
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$$ · Peak Season Rates ($$$)
September in Ha'apai scores 8.1/10 for sightseeing and cultural travel - the single best month of the year. Expect around 23°C, 67 mm of rain, and roughly 27 days with 6+ hours of sunshine this month.
Ha'apai is a lightly developed Tongan island group of low coral islands, quiet beaches, reefs, village life, and slow inter-island travel.
September in Ha'apai tops the year's climate scores
At 23°C (74°F) this is comfortable city weather in September, with sightseeing easiest before lunch and after the afternoon peak.
Budget for roughly 67 mm of rain this month — a flexible day or two helps — with about 27 days with 6+ hours of sunshine and 12 hours of daylight to work around it.
On our climate-comfort scale this is the top-ranked month of the year for Ha'apai at 8.1/10 — the reference point every other month on this page is measured against.
Pack light clothing, a hat and real sun protection, a packable rain layer.
Expect peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Ha'apai in September?
- In September, Ha'apai averages 23°C, 67 mm of rain, and about 27 days with 6+ hours of sunshine. Its climate-comfort score is 8.1/10.
- Is September a good time to visit Ha'apai?
- September earns a 8.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Ha'apai in September?
- Expect about 67 mm of rain in September. Average humidity is 76% and there are about 27 days with 6+ hours of sunshine.
Curated in Ha'apai
Tickets & experiences
Things to do in Ha'apai
Ha'apai, Tonga. Live activities and tours from GetYourGuide, matched to this destination.