Tonga climate guide

Temperature in Tonga (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
29°C maximum daytime temperature in January in Tonga (Nuku'alofa)29
29°C maximum daytime temperature in February in Tonga (Nuku'alofa)29
29°C maximum daytime temperature in March in Tonga (Nuku'alofa)29
28°C maximum daytime temperature in April in Tonga (Nuku'alofa)28
26°C maximum daytime temperature in May in Tonga (Nuku'alofa)26
26°C maximum daytime temperature in June in Tonga (Nuku'alofa)26
25°C maximum daytime temperature in July in Tonga (Nuku'alofa)25
25°C maximum daytime temperature in August in Tonga (Nuku'alofa)25
25°C maximum daytime temperature in September in Tonga (Nuku'alofa)25
26°C maximum daytime temperature in October in Tonga (Nuku'alofa)26
27°C maximum daytime temperature in November in Tonga (Nuku'alofa)27
28°C maximum daytime temperature in December in Tonga (Nuku'alofa)28
Min temperature (night-time)
24°C minimum night-time temperature in January in Tonga (Nuku'alofa)24
24°C minimum night-time temperature in February in Tonga (Nuku'alofa)24
24°C minimum night-time temperature in March in Tonga (Nuku'alofa)24
23°C minimum night-time temperature in April in Tonga (Nuku'alofa)23
21°C minimum night-time temperature in May in Tonga (Nuku'alofa)21
21°C minimum night-time temperature in June in Tonga (Nuku'alofa)21
20°C minimum night-time temperature in July in Tonga (Nuku'alofa)20
20°C minimum night-time temperature in August in Tonga (Nuku'alofa)20
20°C minimum night-time temperature in September in Tonga (Nuku'alofa)20
21°C minimum night-time temperature in October in Tonga (Nuku'alofa)21
22°C minimum night-time temperature in November in Tonga (Nuku'alofa)22
23°C minimum night-time temperature in December in Tonga (Nuku'alofa)23
Sea temperature
27°C sea temperature in January in Tonga (Nuku'alofa)27
27°C sea temperature in February in Tonga (Nuku'alofa)27
27°C sea temperature in March in Tonga (Nuku'alofa)27
27°C sea temperature in April in Tonga (Nuku'alofa)27
26°C sea temperature in May in Tonga (Nuku'alofa)26
25°C sea temperature in June in Tonga (Nuku'alofa)25
24°C sea temperature in July in Tonga (Nuku'alofa)24
23°C sea temperature in August in Tonga (Nuku'alofa)23
23°C sea temperature in September in Tonga (Nuku'alofa)23
24°C sea temperature in October in Tonga (Nuku'alofa)24
25°C sea temperature in November in Tonga (Nuku'alofa)25
26°C sea temperature in December in Tonga (Nuku'alofa)26

Sunshine & Daylight in Tonga

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of daylight
13 hours of daylight per day in January in Tonga (Nuku'alofa)13
13 hours of daylight per day in February in Tonga (Nuku'alofa)13
12 hours of daylight per day in March in Tonga (Nuku'alofa)12
12 hours of daylight per day in April in Tonga (Nuku'alofa)12
11 hours of daylight per day in May in Tonga (Nuku'alofa)11
11 hours of daylight per day in June in Tonga (Nuku'alofa)11
11 hours of daylight per day in July in Tonga (Nuku'alofa)11
11 hours of daylight per day in August in Tonga (Nuku'alofa)11
12 hours of daylight per day in September in Tonga (Nuku'alofa)12
13 hours of daylight per day in October in Tonga (Nuku'alofa)13
13 hours of daylight per day in November in Tonga (Nuku'alofa)13
13 hours of daylight per day in December in Tonga (Nuku'alofa)13

Rainfall in Tonga

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
18 days with some rainfall in January in Tonga (Nuku'alofa)18
17 days with some rainfall in February in Tonga (Nuku'alofa)17
18 days with some rainfall in March in Tonga (Nuku'alofa)18
13 days with some rainfall in April in Tonga (Nuku'alofa)13
9 days with some rainfall in May in Tonga (Nuku'alofa)9
5 days with some rainfall in June in Tonga (Nuku'alofa)5
4 days with some rainfall in July in Tonga (Nuku'alofa)4
3 days with some rainfall in August in Tonga (Nuku'alofa)3
4 days with some rainfall in September in Tonga (Nuku'alofa)4
4 days with some rainfall in October in Tonga (Nuku'alofa)4
6 days with some rainfall in November in Tonga (Nuku'alofa)6
12 days with some rainfall in December in Tonga (Nuku'alofa)12
Average monthly rainfall (mm)
174 mm monthly rainfall in January in Tonga (Nuku'alofa)174
191 mm monthly rainfall in February in Tonga (Nuku'alofa)191
263 mm monthly rainfall in March in Tonga (Nuku'alofa)263
156 mm monthly rainfall in April in Tonga (Nuku'alofa)156
102 mm monthly rainfall in May in Tonga (Nuku'alofa)102
72 mm monthly rainfall in June in Tonga (Nuku'alofa)72
87 mm monthly rainfall in July in Tonga (Nuku'alofa)87
108 mm monthly rainfall in August in Tonga (Nuku'alofa)108
114 mm monthly rainfall in September in Tonga (Nuku'alofa)114
93 mm monthly rainfall in October in Tonga (Nuku'alofa)93
114 mm monthly rainfall in November in Tonga (Nuku'alofa)114
127 mm monthly rainfall in December in Tonga (Nuku'alofa)127

More climate for Tonga

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 11+ (Extreme) in January in Tonga (Nuku'alofa)11
UV (maximum) index 11+ (Extreme) in February in Tonga (Nuku'alofa)11
UV (maximum) index 11+ (Extreme) in March in Tonga (Nuku'alofa)11
UV (maximum) index 10 (Very High) in April in Tonga (Nuku'alofa)10
UV (maximum) index 7 (High) in May in Tonga (Nuku'alofa)7
UV (maximum) index 6 (High) in June in Tonga (Nuku'alofa)6
UV (maximum) index 6 (High) in July in Tonga (Nuku'alofa)6
UV (maximum) index 8 (Very High) in August in Tonga (Nuku'alofa)8
UV (maximum) index 10 (Very High) in September in Tonga (Nuku'alofa)10
UV (maximum) index 11 (Extreme) in October in Tonga (Nuku'alofa)11
UV (maximum) index 11+ (Extreme) in November in Tonga (Nuku'alofa)11
UV (maximum) index 11+ (Extreme) in December in Tonga (Nuku'alofa)11
Heat & Humidity
High heat & humidity in January in Tonga (Nuku'alofa)H
High heat & humidity in February in Tonga (Nuku'alofa)H
High heat & humidity in March in Tonga (Nuku'alofa)H
High heat & humidity in April in Tonga (Nuku'alofa)H
Moderate heat & humidity in May in Tonga (Nuku'alofa)M
Low heat & humidity in June in Tonga (Nuku'alofa)L
Low heat & humidity in July in Tonga (Nuku'alofa)L
Low heat & humidity in August in Tonga (Nuku'alofa)L
Low heat & humidity in September in Tonga (Nuku'alofa)L
Moderate heat & humidity in October in Tonga (Nuku'alofa)M
Moderate heat & humidity in November in Tonga (Nuku'alofa)M
High heat & humidity in December in Tonga (Nuku'alofa)H

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

Going to Tonga? Find the best month to visit Tonga based on the weather.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Check climate guides for Tonga showing average temperature, rainfall & sunshine figures for each month of the year. The climate guide shown above is for Nuku'alofa.

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More about Tonga

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

The climate guide for Tonga, represented by Nuku'alofa, shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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Tonga climate overview

The Kingdom of Tonga is a South Pacific archipelago lying to the east of Fiji, made up of 172 tropical islands. Named 'the Friendly Isles' by Captain Cook, Tonga has the distinction of being the only island group in the South Pacific never to have been colonised, although it became a British Protectorate in 1900. Today its people still follow a traditional lifestyle and their respect for time-honoured customs has helped Tonga retain its distinctive character as one of the most intact cultures of old Polynesia.

The islands have a mixture of volcanic and raised coral origins, resulting in widely varying geography and vegetation. In the north the Niuas and Vava'u island groups are generally more mountainous supporting dense woodland. However most of the islands, particularly in the south, consist of low-lying coral formations. About two thirds of the population live on Tongatapu where the capital Nuku'alofa backs onto a large lagoon.

A number of islands are volcanically active including Falcon Island, a rare submerged volcano that periodically erupts underwater. Beautiful beaches and coral reefs also fringe most islands, while on Late and Tofua there are still some areas of high diversity native forest still standing.

The climate is tropical with rainfall in all months becoming heaviest during February and March. This is also the hottest time of the year although, with fairly constant south-east trade winds and its relatively southern location, Tonga is not as hot as Fiji and Samoa. From April to October there is a cooler drier period when it is also likely to be sunnier.

Tropical cyclones are possible from January to April, and are more likely in the north.

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