Tonga monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at Tonga
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 30.1 | 31 | 30.3 | 29.3 | 28.4 | 27.2 | 26 | 25.6 | 26.5 | 27.2 | 28.4 | 28.9 |
| °F | 86.1 | 87.8 | 86.5 | 84.8 | 83.2 | 80.9 | 78.9 | 78.1 | 79.7 | 81 | 83.1 | 84 |
Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.
Average rainfall & rainy days
The graph below shows the average rainfall and number of rainy days per month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 10 | 26 | 119 | 161 | 193 | 186 | 259 | 335 | 361 | 311 | 73 | 8 |
| inches | 0.4 | 1 | 4.7 | 6.3 | 7.6 | 7.3 | 10.2 | 13.2 | 14.2 | 12.2 | 2.9 | 0.3 |
| Rainy days | 2 | 4 | 12 | 17 | 20 | 21 | 22 | 24 | 25 | 24 | 9 | 2 |
Average annual rainfall in Tonga: 2056.967mm (809.8 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in Tonga
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 7.8 | 7.6 | 6.5 | 6.6 | 6.5 | 5.4 | 3.5 | 3.2 | 4 | 5.3 | 7.3 | 7.8 |
Day / night temperatures
The graph below shows the daily range of temperatures for each month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min °C | 19.1 | 19.7 | 20.1 | 20.1 | 19.8 | 19.3 | 19 | 19 | 18.9 | 19 | 19 | 18.5 |
| Max °C | 30.4 | 31.3 | 30.5 | 29.6 | 28.7 | 27.4 | 26.2 | 25.8 | 26.7 | 27.4 | 28.6 | 29.2 |
| Min °F | 66.3 | 67.5 | 68.2 | 68.1 | 67.6 | 66.7 | 66.2 | 66.2 | 66 | 66.2 | 66.2 | 65.2 |
| Max °F | 76.5 | 77.9 | 77.5 | 76.6 | 75.6 | 73.9 | 72.7 | 72.3 | 73 | 73.8 | 74.8 | 74.8 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 28.1 | 28.5 | 28.8 | 29 | 28.8 | 28 | 27 | 26.4 | 26.6 | 27.2 | 27.7 | 28.1 |
| °F | 82.5 | 83.2 | 83.9 | 84.1 | 83.8 | 82.4 | 80.6 | 79.5 | 79.9 | 80.9 | 81.9 | 82.6 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 5 | 6 | 5 | 5 | 5 | 5 | 5 | 6 | 5 | 5 | 5 | 5 |
| mph | 3 | 4 | 3 | 3 | 3 | 3 | 3 | 4 | 3 | 3 | 3 | 3 |
A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.
Relative humidity
The graph below shows the average relative humidity.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 66% | 63% | 70% | 75% | 80% | 83% | 85% | 84% | 83% | 81% | 76% | 71% |
Other monthly averages
Tonga weather stats
| Hottest month: | February | 31°C 87.8°F |
|---|---|---|
| Driest month: | December | 8mm 0.3ins |
| Sunniest month: | January | 7.8hrs |
| Coldest month: | August | 25.6°C 78.1°F |
| Wettest month: | September | 361mm 14.2ins |
| Warmest sea: | April | 29°C 84.2°F |
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