Click on a day for an hourly weather forecast
The weather in Tonga in September is very hot. The average temperatures are between 24°C and 25°C, drinking water regularly is advisable.
You can expect about 3 to 8 days of rain in Tonga during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Tonga in September 2025.
If you’re planning to visit Tonga in the near future, we highly recommend that you review the 14 day weather forecast for Tonga before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 28° / 27° | 12 | 19 | 0 | 508 mm | Good | Tonga in January |
| February | 28° / 27° | 13 | 15 | 0 | 499 mm | Good | Tonga in February |
| March | 28° / 27° | 11 | 20 | 0 | 278 mm | Good | Tonga in March |
| April | 27° / 26° | 8 | 22 | 0 | 232 mm | Good | Tonga in April |
| May | 27° / 26° | 6 | 25 | 0 | 218 mm | Perfect | Tonga in May |
| June | 26° / 25° | 3 | 27 | 0 | 101 mm | Perfect | Tonga in June |
| July | 25° / 24° | 3 | 28 | 0 | 85 mm | Perfect | Tonga in July |
| August | 25° / 23° | 3 | 28 | 0 | 102 mm | Perfect | Tonga in August |
| September | 25° / 24° | 5 | 26 | 0 | 107 mm | Perfect | Tonga in September |
| October | 26° / 25° | 6 | 25 | 0 | 153 mm | Perfect | Tonga in October |
| November | 26° / 25° | 6 | 24 | 0 | 176 mm | Perfect | Tonga in November |
| December | 27° / 26° | 10 | 21 | 0 | 282 mm | Good | Tonga in December |