Click on a day for an hourly weather forecast
The weather in Tongatapu in September is hot. The average temperatures are between 22°C and 23°C.
You can expect about 3 to 8 days of rain in Tongatapu 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 Tongatapu in September 2025.
If you’re planning to visit Tongatapu in the near future, we highly recommend that you review the 14 day weather forecast for Tongatapu before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 27° / 26° | 10 | 21 | 0 | 314 mm | Good | Tongatapu in January |
| February | 27° / 26° | 10 | 19 | 0 | 357 mm | Good | Tongatapu in February |
| March | 27° / 26° | 10 | 21 | 0 | 298 mm | Good | Tongatapu in March |
| April | 26° / 25° | 5 | 25 | 0 | 181 mm | Perfect | Tongatapu in April |
| May | 25° / 24° | 4 | 27 | 0 | 145 mm | Perfect | Tongatapu in May |
| June | 24° / 23° | 4 | 26 | 0 | 135 mm | Perfect | Tongatapu in June |
| July | 23° / 22° | 5 | 26 | 0 | 130 mm | Perfect | Tongatapu in July |
| August | 23° / 21° | 4 | 27 | 0 | 122 mm | Perfect | Tongatapu in August |
| September | 23° / 22° | 5 | 25 | 0 | 146 mm | Perfect | Tongatapu in September |
| October | 24° / 23° | 3 | 28 | 0 | 94 mm | Perfect | Tongatapu in October |
| November | 25° / 24° | 3 | 27 | 0 | 86 mm | Perfect | Tongatapu in November |
| December | 26° / 25° | 4 | 27 | 0 | 137 mm | Perfect | Tongatapu in December |