Swimming in Tonga in september 2025 Sea temperature by city in september
Do you want to go to the beach in Tonga in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in Tonga by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Tonga in september 2025
Here, find the average sea temperature in Tonga in september in several coastal cities.
76°F
min: 73°F / max: 78°F
77°F
min: 74°F / max: 80°F
75°F
min: 73°F / max: 78°F
79°F
min: 77°F / max: 81°F
Where should you go swimming in Tonga in the month of september?
Swimming in Tonga in september is pleasant
In september in Tonga swimming conditions are generally the same everywhere.
As for Nukuʻalofa, Haʻapai islands (Lifuka and Foa), Tongatapu Island and Vavaʻu island, swimming is pleasant in september. The sea water is 76°F on average (min: 73°F/max: 78°F) so you can easily spend time in the water.
Where to go swimming in Tonga in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Nukuʻalofa
| September | |||
| Average sea temperature | 76°F | ||
| Minimum sea temperature | 73°F | ||
| Maximum sea temperature | 78°F | ||
| Average outside temperature | 74°F | ||
| Maximum outside temperature | 76°F | ||
| Minimum outside temperature | 74°F | ||
| Precipitation | 5.7in | ||
| Number of days of precipitation | 5 jour(s) (18%) | ||
| Cloud cover | 50% | ||
| Our opinion | pleasant swimming |
More information on swimming in Nukuʻalofa in september
Haʻapai islands (Lifuka and Foa)
| September | |||
| Average sea temperature | 77°F | ||
| Minimum sea temperature | 74°F | ||
| Maximum sea temperature | 80°F | ||
| Average outside temperature | 76°F | ||
| Maximum outside temperature | 77°F | ||
| Minimum outside temperature | 76°F | ||
| Precipitation | 4.4in | ||
| Number of days of precipitation | 4 jour(s) (14%) | ||
| Cloud cover | 50% | ||
| Our opinion | pleasant swimming |
More information on swimming in Haʻapai islands (Lifuka / Foa) in september
Tongatapu Island
| September | |||
| Average sea temperature | 75°F | ||
| Minimum sea temperature | 73°F | ||
| Maximum sea temperature | 78°F | ||
| Average outside temperature | 74°F | ||
| Maximum outside temperature | 76°F | ||
| Minimum outside temperature | 74°F | ||
| Precipitation | 5.7in | ||
| Number of days of precipitation | 5 jour(s) (18%) | ||
| Cloud cover | 50% | ||
| Our opinion | pleasant swimming |
More information on swimming in Tongatapu Island in september
Vavaʻu island
| September | |||
| Average sea temperature | 79°F | ||
| Minimum sea temperature | 77°F | ||
| Maximum sea temperature | 81°F | ||
| Average outside temperature | 77°F | ||
| Maximum outside temperature | 77°F | ||
| Minimum outside temperature | 77°F | ||
| Precipitation | 4.5in | ||
| Number of days of precipitation | 6 jour(s) (19%) | ||
| Cloud cover | 53% | ||
| Our opinion | pleasant swimming |
More information on swimming in Vavaʻu island in september
List of coastal cities in Tonga
| Nukuʻalofa in september | pleasant swimming |
| Haʻapai islands (Lifuka and Foa) in september | pleasant swimming |
| Tongatapu Island in september | pleasant swimming |
| Vavaʻu island in september | pleasant swimming |