The month in detail
What to expect in September
Spring marks the start of the good season in Tonga. Temperatures rise (24°C) and tourists have not yet arrived en masse. Rain risk remains low (23% of days), leaving good room for outdoor activities. A good balance between weather and crowds, even if June (8.2/10) remains theoretically better.
September is the best month of the year in Tonga.
This month's conditions
What it's like in September
UV index
7 · high
sunscreen and hat advised
Feels like
muggy at times
17°
Sea
24°C
pleasant for swimming
Daylight
11.9h of daylight
Air quality
good
AQI 25
Compare
Is September the right month?
The best month in Tonga is June (8.2/10), 0.0 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Tonga
Expedia →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
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🎟️ Activities & tours · Tonga
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.
Country · Tonga
🗣️LanguageTongan
💶CurrencyPaʻanga tongan (T$)
🚗DrivingLeft-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘCheap · 2/5
🌡️ Climate
🌍Climate typeTropical
📈Climate trend ⓘ+0.85°C/decade
🔥Hottest monthJanuary · 28°C
❄️Coolest monthAugust · 23°C
🌧️Rainiest month ⓘFebruary · 60%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘSeason Nov-Apr
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Tonga ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
TongaTropical climate with a 8.2 → 5.0 gap between best and worst month. 10 years of ERA5 data to choose by project.
21.21°S · 175.15°W
Questions
Frequently asked questions
What is the best time to visit Tonga?
June is the best month with 25.0°C highs, 22.0°C lows, 6.7h of sunshine and 21.0% rainy days. The months of June & July offer comparable conditions.
How many hours of sunshine does Tonga get in June?
Tonga averages 6.7 sunshine hours per day in June. It is the sunniest month with a climate score of 7.7/10.
What is the rainiest month in Tonga?
February is the most unfavourable month with February has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Tonga in June?
In June, overnight lows reach 22.0°C, while afternoon highs average 25.0°C.
Is Tonga good in winter?
In winter (December-February), Tonga scores 5.7/10 on average — Decent period conditions for cultural visits.. The best month overall remains June with a score of 7.7/10.
When should you avoid Tonga?
February is the most difficult month to visit Tonga, with February has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Tonga in September?
In September, the sea averages 24°C in Tonga: pleasant for swimming. Swimming is pleasant without a wetsuit.
Do you need sun protection in Tonga in September?
The average UV index reaches 7 in September in Tonga (high), with about 11.9h of daylight. Sunscreen and hat advised.