Avarua, Cook Islands climate

Af Tropical rainforest

Avarua 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 19°C at night. Around 1516 mm of precipitation falls each year, peaking in January (183 mm) and easing off in June (61 mm).

☀️ All year

Warm

Daytime highs near 30°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 19°C.

🌧️ Rain

Wet

About 1516 mm of rain a year.

Wettest in January

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Avarua climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	30	30	29	27	26	26	26	26	27	28	29
Avg temp (°C)	26	27	27	26	24	23	23	22	23	24	25	26
Avg low (°C)	24	24	24	23	21	20	19	19	20	20	22	23
Precipitation (mm)	183	176	164	169	140	61	93	82	85	73	115	175

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	29	30	30	29	27	26
Avg temp (°C)	26	27	27	26	24	23
Avg low (°C)	24	24	24	23	21	20
Precipitation (mm)	183	176	164	169	140	61

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	26	26	26	27	28	29
Avg temp (°C)	23	22	23	24	25	26
Avg low (°C)	19	19	20	20	22	23
Precipitation (mm)	93	82	85	73	115	175

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	72	71	68	69	70	67	65	66	68	69	69	70
Relative humidity (%)	82	81	81	80	79	78	78	78	79	80	80	81
Wind speed (mph)	11.5	11.7	11.1	12.0	11.9	12.4	12.3	12.3	13.0	12.4	11.4	12.0

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	72	71	68	69	70	67
Relative humidity (%)	82	81	81	80	79	78
Wind speed (mph)	11.5	11.7	11.1	12.0	11.9	12.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	65	66	68	69	69	70
Relative humidity (%)	78	78	79	80	80	81
Wind speed (mph)	12.3	12.3	13.0	12.4	11.4	12.0

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Rarotonga Intl, a weather station, about 3 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.

How we build these numbers →