AU
Level 1Exercise normal precautions
Exercise normal precautions
Tonga · Month guide
Tonga in September
Around 24 °C with 94 mm of rain and 6.6 hours of sun a day.
September is a solid shoulder-season month in Tonga. Around 24 °C with 94 mm of rain and 6.6 hours of sun a day. Use the regional grid below to find where this month works best — national averages hide the swings between coast, highlands, and inland.
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Tonga · September
What the weather usually does
Tonga · typical month
- Day / night23 – 24 °CYear range 22 – 27 °C
- Rainfall94 mmYear range 93 – 312 mm
- Sunshine6.6 hr / dayYear range 5.2 – 8.0 hr / day
What’s open · September
Things to do in Tonga in September
Nothing in Tonga shuts for the season, and 2 things below are at their best in September.
- At its bestIsland and beach travel
the dry season — less humid, and outside the cyclone window
Sources: responsibletravel.com, taketravelinfo.com
- At its bestSwimming with humpback whales
the best months of a season that runs July to early November
Source: farandawayadventures.com
Opening seasons are checked by hand against the operators and parks themselves, not derived from the climate figures on this page. Last reviewed 2026-08-28. Dates move — confirm before you book.
5 regions · current month
Tonga, taken apart
Safety · 4 governments
What the governments say about Tonga
Combined advisory · most-cautious-wins
Exercise normal precautions
Highest level across 4 governments · Advisory last changed
See breakdown by countryHide breakdown
DE
Level 1Exercise normal precautions
Exercise normal precautions
NL
Level 1Exercise normal precautions
Exercise normal precautions
US
Level 1Exercise normal precautions
Exercise normal precautions
Climate at a glance · 10-year ERA5
A decade of weather, in one page
— daytime high— overnight low▬ typical range
View data table
| Month | Average daytime high (°C) | Average overnight low (°C) | Typical low | Typical high |
|---|---|---|---|---|
| January | 27.1 | 25.8 | 24.8 | 28.1 |
| February | 27.4 | 26.1 | 24.9 | 28.3 |
| March | 27.1 | 25.8 | 24.7 | 28.1 |
| April | 26.6 | 25.4 | 24.3 | 27.6 |
| May | 25.5 | 24.4 | 23.0 | 26.8 |
| June | 24.7 | 23.6 | 22.1 | 26.0 |
| July | 23.8 | 22.8 | 21.2 | 25.1 |
| August | 23.5 | 22.4 | 20.9 | 24.9 |
| September | 23.7 | 22.7 | 21.0 | 25.2 |
| October | 24.4 | 23.3 | 21.9 | 25.5 |
| November | 25.4 | 24.3 | 22.8 | 26.7 |
| December | 26.4 | 25.2 | 24.0 | 27.4 |
View data table
| Month | Rainfall (mm) |
|---|---|
| January | 287 |
| February | 312 |
| March | 312 |
| April | 194 |
| May | 160 |
| June | 118 |
| July | 93 |
| August | 103 |
| September | 94 |
| October | 157 |
| November | 139 |
| December | 183 |
View data table
| Month | Sunshine hours (hr / day) |
|---|---|
| January | 7.3 |
| February | 6.4 |
| March | 5.9 |
| April | 6.3 |
| May | 5.6 |
| June | 5.2 |
| July | 5.5 |
| August | 5.6 |
| September | 6.6 |
| October | 6.9 |
| November | 8.0 |
| December | 7.9 |
— average▬ typical range
View data table
| Month | Average wind speed (km/h) | Typical low | Typical high |
|---|---|---|---|
| January | 21.1 | 9.6 | 35.2 |
| February | 24.7 | 11.4 | 40.6 |
| March | 21.1 | 10.6 | 32.3 |
| April | 24.8 | 11.8 | 39.8 |
| May | 25.8 | 12.9 | 43.5 |
| June | 24.7 | 12.6 | 39.6 |
| July | 25.7 | 12.8 | 39.1 |
| August | 24.9 | 12.8 | 37.3 |
| September | 25.4 | 11.7 | 39.4 |
| October | 26.3 | 13.4 | 40.3 |
| November | 23.1 | 10.4 | 36.5 |
| December | 22.6 | 10.6 | 36.3 |
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Humidity
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