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Nuku‘alofa, Tonga climate
Af Tropical rainforest
Nuku‘alofa has a remarkably steady tropical climate (Tropical rainforest, Köppen Af). The hottest month is February with an average daily high near 30°C, while the coldest is August averaging around 21°C at night. Around 1582 mm of precipitation falls each year, peaking in February (212 mm) and easing off in August (69 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Nuku‘alofa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 30 | 29 | 28 | 27 | 26 | 26 | 26 | 27 | 28 | 29 |
| Avg temp (°C) | 27 | 27 | 27 | 26 | 25 | 24 | 23 | 23 | 24 | 25 | 26 | 27 |
| Avg low (°C) | 25 | 25 | 25 | 24 | 23 | 22 | 21 | 21 | 21 | 22 | 23 | 24 |
| Precipitation (mm) | 173 | 212 | 166 | 162 | 123 | 92 | 98 | 69 | 96 | 105 | 122 | 165 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 30 | 29 | 28 | 27 |
| Avg temp (°C) | 27 | 27 | 27 | 26 | 25 | 24 |
| Avg low (°C) | 25 | 25 | 25 | 24 | 23 | 22 |
| Precipitation (mm) | 173 | 212 | 166 | 162 | 123 | 92 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 26 | 26 | 27 | 28 | 29 |
| Avg temp (°C) | 23 | 23 | 24 | 25 | 26 | 27 |
| Avg low (°C) | 21 | 21 | 21 | 22 | 23 | 24 |
| Precipitation (mm) | 98 | 69 | 96 | 105 | 122 | 165 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 69 | 69 | 70 | 68 | 68 | 66 | 67 | 68 | 69 | 70 | 71 |
| Relative humidity (%) | 83 | 82 | 82 | 80 | 79 | 79 | 78 | 79 | 80 | 80 | 81 | 81 |
| Wind speed (km/h) | 19.6 | 18.9 | 18.4 | 20.8 | 20.5 | 21.2 | 21.0 | 20.7 | 21.0 | 20.7 | 19.2 | 20.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 69 | 69 | 70 | 68 | 68 |
| Relative humidity (%) | 83 | 82 | 82 | 80 | 79 | 79 |
| Wind speed (km/h) | 19.6 | 18.9 | 18.4 | 20.8 | 20.5 | 21.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 67 | 68 | 69 | 70 | 71 |
| Relative humidity (%) | 78 | 79 | 80 | 80 | 81 | 81 |
| Wind speed (km/h) | 21.0 | 20.7 | 21.0 | 20.7 | 19.2 | 20.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Haapai, a weather station, about 176 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.