Tongatapu, Tonga: vitamin D, best months and travel guide
Main island with blowholes and beach resorts. Best for: families, culture travellers.
The best months for vitamin D in Tongatapu are April, June to September, when a full dose takes about 7 minutes at midday. Rainy or stormy in May and from October to March.
Tongatapu month by month
| Month | Rating | Sun window | Peak UV | Full dose, age 30 | Afternoon high | Rainy days |
|---|---|---|---|---|---|---|
| January | Bad weather | 8.1 h | 8.4 | 6 min | 28°C | 24/30 |
| February | Bad weather | 8.4 h | 9.2 | 6 min | 28°C | 28/30 |
| March | Bad weather | 5.8 h | 6.5 | 8 min | 28°C | 26/30 |
| April | Excellent | 7.3 h | 7.0 | 8 min | 28°C | 16/30 |
| May | Bad weather | 5.1 h | 5.3 | 10 min | 26°C | 18/30 |
| June | Good | 5.4 h | 5.1 | 10 min | 25°C | 12/30 |
| July | Good | 5.8 h | 5.4 | 10 min | 24°C | 10/30 |
| August | Good | 6.0 h | 6.1 | 9 min | 24°C | 14/30 |
| September | Excellent | 6.9 h | 7.3 | 7 min | 24°C | 15/30 |
| October | Bad weather | 7.4 h | 7.7 | 7 min | 25°C | 18/30 |
| November | Bad weather | 8.4 h | 8.7 | 6 min | 26°C | 20/30 |
| December | Bad weather | 8.7 h | 9.0 | 6 min | 29°C | 20/30 |
Sun window is the number of hours a day with UV Index 2.5 or higher. Full dose is the minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, for skin type III. Rainy days are days with at least 1 mm out of 30.
What to expect in Tongatapu
Main island with blowholes and beach resorts. Humpback whale season is from July to October. The weather is warm, with a wetter season from November to April and cyclone risk. Sundays are strictly quiet.
In Tongatapu afternoon highs average from 24°C in September to 29°C in December. The wettest month is February (about 28 rainy days out of 30) and the driest is July (10). Midday UV peaks at 9.2 in February, which is very strong, so protect your skin.
More about Tonga · Tonga in September · Best places in September
Questions about Tongatapu
When is the best time to visit Tongatapu for vitamin D?
The best months for vitamin D in Tongatapu are April, June to September, when a full dose takes about 7 minutes at midday.
What is the weather like in Tongatapu?
Afternoon highs average from 24°C in September to 29°C in December. The wettest month is February, with about 28 rainy days out of 30.
Which months should I avoid in Tongatapu?
For a beach stay, avoid the months when it is rainy or stormy in May and from October to March.