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The climate of the Tonga islands is tropical maritime. The climate of the islands can easily be divided into two distinct seasons: a cooler and less rainy season between May and November, and a warmer and rainier season between December and April. In the capital Nuku’alofa the average maximum temperatures are maintained between 29 ° C in January and 24 ° C in August, the average minimum temperatures vary between 23 ° C in February and 18 ° C in August.
The rains are most abundant between December and March. March and February are the rainiest months ever. The average annual rainfall is 1,600 mm in the island of Tongatapu and in the Haapai group of islands, while it is 2,200 mm in Vava’u and 2,600 mm in Niuatoputapu. In the islands there is no real dry season. In the capital Nukuʻalofa there are on average 134 days of rain per year, spread between 10 and 14 days of rain per month. The average annual humidity is around 75%.
The months between December and April are the months in which tropical hurricanes can be struck on the islands. The northernmost islands, which are located closest to the Equator, are most at risk of hurricanes.
The temperature of the sea around the island of Tongatapu varies between 23 ° C and 27 ° C.
WHEN TO GO TO TONGA
The best time for a trip to the Tonga islands are the relatively dry and cool months between May and November.
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THE CLIMATE OF THE TONGA ISLANDS: CLIMATE TABLES
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| NUKU’ALOFA, TONGATAPU (4 meters) | ||||
| Month | Average low (°C) | Average high (°C) | Precip. (mm) | Precip. days |
| January | 22 | 28 | 174 | |
| February | 22 | 29 | 189 | |
| March | 22 | 28 | 263 | |
| April | 21 | 27 | 156 | |
| May | 20 | 26 | 102 | |
| June | 18 | 25 | 72 | |
| July | 17 | 25 | 87 | |
| August | 18 | 24 | 108 | |
| September | 18 | 25 | 114 | |
| October | 19 | 25 | 93 | |
| November | 20 | 27 | 114 | |
| December | 20 | 27 | 127 | |
| YEAR | 1599 | |||
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| TONGATAPU | ||||
| Month | Sea Water Temperature °C | |||
| January | 27 | |||
| February | 27 | |||
| March | 27 | |||
| April | 27 | |||
| May | 26 | |||
| June | 24 | |||
| July | 24 | |||
| August | 23 | |||
| September | 23 | |||
| October | 24 | |||
| November | 24 | |||
| December | 25 | |||
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