Cook Islands climate guide

Temperature in Cook Islands (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
28°C maximum daytime temperature in January in Cook Islands (Avarua)28
29°C maximum daytime temperature in February in Cook Islands (Avarua)29
29°C maximum daytime temperature in March in Cook Islands (Avarua)29
28°C maximum daytime temperature in April in Cook Islands (Avarua)28
27°C maximum daytime temperature in May in Cook Islands (Avarua)27
26°C maximum daytime temperature in June in Cook Islands (Avarua)26
25°C maximum daytime temperature in July in Cook Islands (Avarua)25
25°C maximum daytime temperature in August in Cook Islands (Avarua)25
26°C maximum daytime temperature in September in Cook Islands (Avarua)26
26°C maximum daytime temperature in October in Cook Islands (Avarua)26
27°C maximum daytime temperature in November in Cook Islands (Avarua)27
28°C maximum daytime temperature in December in Cook Islands (Avarua)28
Min temperature (night-time)
23°C minimum night-time temperature in January in Cook Islands (Avarua)23
23°C minimum night-time temperature in February in Cook Islands (Avarua)23
23°C minimum night-time temperature in March in Cook Islands (Avarua)23
22°C minimum night-time temperature in April in Cook Islands (Avarua)22
21°C minimum night-time temperature in May in Cook Islands (Avarua)21
20°C minimum night-time temperature in June in Cook Islands (Avarua)20
19°C minimum night-time temperature in July in Cook Islands (Avarua)19
19°C minimum night-time temperature in August in Cook Islands (Avarua)19
19°C minimum night-time temperature in September in Cook Islands (Avarua)19
20°C minimum night-time temperature in October in Cook Islands (Avarua)20
21°C minimum night-time temperature in November in Cook Islands (Avarua)21
22°C minimum night-time temperature in December in Cook Islands (Avarua)22
Sea temperature
27°C sea temperature in January in Cook Islands (Avarua)27
27°C sea temperature in February in Cook Islands (Avarua)27
28°C sea temperature in March in Cook Islands (Avarua)28
27°C sea temperature in April in Cook Islands (Avarua)27
26°C sea temperature in May in Cook Islands (Avarua)26
25°C sea temperature in June in Cook Islands (Avarua)25
25°C sea temperature in July in Cook Islands (Avarua)25
24°C sea temperature in August in Cook Islands (Avarua)24
24°C sea temperature in September in Cook Islands (Avarua)24
25°C sea temperature in October in Cook Islands (Avarua)25
25°C sea temperature in November in Cook Islands (Avarua)25
26°C sea temperature in December in Cook Islands (Avarua)26

Sunshine & Daylight in Cook Islands

  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 Cook Islands (Avarua)13
13 hours of daylight per day in February in Cook Islands (Avarua)13
12 hours of daylight per day in March in Cook Islands (Avarua)12
12 hours of daylight per day in April in Cook Islands (Avarua)12
11 hours of daylight per day in May in Cook Islands (Avarua)11
11 hours of daylight per day in June in Cook Islands (Avarua)11
11 hours of daylight per day in July in Cook Islands (Avarua)11
11 hours of daylight per day in August in Cook Islands (Avarua)11
12 hours of daylight per day in September in Cook Islands (Avarua)12
13 hours of daylight per day in October in Cook Islands (Avarua)13
13 hours of daylight per day in November in Cook Islands (Avarua)13
13 hours of daylight per day in December in Cook Islands (Avarua)13

Rainfall in Cook Islands

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
17 days with some rainfall in January in Cook Islands (Avarua)17
17 days with some rainfall in February in Cook Islands (Avarua)17
17 days with some rainfall in March in Cook Islands (Avarua)17
13 days with some rainfall in April in Cook Islands (Avarua)13
9 days with some rainfall in May in Cook Islands (Avarua)9
6 days with some rainfall in June in Cook Islands (Avarua)6
5 days with some rainfall in July in Cook Islands (Avarua)5
3 days with some rainfall in August in Cook Islands (Avarua)3
5 days with some rainfall in September in Cook Islands (Avarua)5
5 days with some rainfall in October in Cook Islands (Avarua)5
6 days with some rainfall in November in Cook Islands (Avarua)6
11 days with some rainfall in December in Cook Islands (Avarua)11
Average monthly rainfall (mm)
267 mm monthly rainfall in January in Cook Islands (Avarua)267
237 mm monthly rainfall in February in Cook Islands (Avarua)237
220 mm monthly rainfall in March in Cook Islands (Avarua)220
231 mm monthly rainfall in April in Cook Islands (Avarua)231
205 mm monthly rainfall in May in Cook Islands (Avarua)205
120 mm monthly rainfall in June in Cook Islands (Avarua)120
102 mm monthly rainfall in July in Cook Islands (Avarua)102
152 mm monthly rainfall in August in Cook Islands (Avarua)152
132 mm monthly rainfall in September in Cook Islands (Avarua)132
121 mm monthly rainfall in October in Cook Islands (Avarua)121
174 mm monthly rainfall in November in Cook Islands (Avarua)174
229 mm monthly rainfall in December in Cook Islands (Avarua)229

More climate for Cook Islands

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

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

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

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

Check climate guides for the Cook Islands showing average temperature, rainfall & sunshine figures for each month of the year. The climate guide shown above is for Avarua.

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More about Cook Islands

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

The climate guide for Cook Islands, represented by Avarua, 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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Cook Islands climate overview

The Cook Islands are part of Polynesia, lying almost exactly in the centre of the South Pacific between Tonga and French Polynesia. The indigenous people are Maoris known for their vibrant culture and energetic dances. The 15 islands form a northern and southern group separated by over 800 kilometres (500 miles) of ocean.

The northern group of islands are coral atolls, which are mostly flat and low lying. Because of human occupation none of the original native vegetation of the islands remains. Today coconut palms and pandanus trees grow along the picture-perfect sandy beaches, graced by scenic lagoons.

The southern island group is volcanic in origin. The largest island is Rarotonga, whose rugged mountainous interior is covered in lush jungle, cleared in parts for citrus groves to thrive on the fertile soils. Near the south coast is the stunning Wigmore's Waterfall, while the capital Avarua lies on the north shore.

Coastal resorts have been developed to take advantage of the picturesque sandy beaches, however the most beautiful beaches and lagoons are found on Aitutaki 250 kms (160 miles) to the north.

Coral reefs surround almost all of the islands, creating a sheltered haven of turquoise water, teeming with tropical marine life and bathed in warm water all year.

The climate is warm tropical and wet. Rainfall is likely in all months, becoming heaviest from January to March and more isolated in the sunnier drier season. Daytime temperatures are warm throughout the year, falling to comfortable at night in the drier months.

Tropical Cyclones are possible between December and March but are rare.

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