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Weather in Cook Islands - today, tomorrow and 14-day forecast

Below: today's conditions city by city, a live weather map, the 14-day outlook and month-by-month climate to help you pick the best time to travel.

single country point. About & methodology.

Next days in Cook Islands

today🌧️ 20°💧 2 mm
Sun🌧️ 20°💧 10.1 mm
Mon🌧️ 19°💧 0.2 mm
Tue🌧️ 20°💧 1.1 mm
Wed🌧️ 20°💧 2.6 mm
Thu☀️ 19°💧 0.2 mm
Fri🌧️ 20°💧 0.1 mm
Sat🌧️ 20°💧 5.5 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Friday 4 Sept in Cook Islands, the forecast high is 20°C. Typical daytime temperatures at this time of year range from 22°C to 25°C, so it will be exceptionally cool. It is cooler than 99% of similar days.

20°Cexceptionally cool
usually 22°C–25°C
cooler than 99% of similar days
night: exceptionally cool rain: more rain than usual wind: typical
20°Cexceptionally cool
usually 22°C–25°C
cooler than 99% of similar days
night: exceptionally cool rain: exceptionally wet wind: typical
19°Cexceptionally cool
usually 22°C–24°C
cooler than 99% of similar days
night: exceptionally cool rain: typical rainfall wind: stronger than usual
20°Cexceptionally cool
usually 22°C–24°C
cooler than 99% of similar days
night: exceptionally cool rain: typical rainfall wind: typical
20°Cexceptionally cool
usually 22°C–24°C
cooler than 99% of similar days
night: exceptionally cool rain: more rain than usual wind: typical
19°Cexceptionally cool
usually 22°C–24°C
cooler than 99% of similar days
night: exceptionally cool rain: less rain than usual wind: exceptionally light
20°Cexceptionally cool
usually 22°C–24°C
cooler than 99% of similar days
night: exceptionally cool rain: less rain than usual wind: exceptionally light

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
15°23°30° 1981: 24°C1982: 21°C1983: 22°C1984: 22°C1985: 22°C1986: 23°C1987: 22°C1988: 25°C1989: 23°C1990: 23°C1991: 23°C1992: 25°C1993: 23°C1994: 23°C1995: 23°C1996: 23°C1997: 22°C1998: 23°C1999: 24°C2000: 23°C2001: 22°C2002: 23°C2003: 25°C2004: 23°C2005: 24°C2006: 24°C2007: 23°C2008: 24°C2009: 23°C2010: 25°C2011: 24°C2012: 24°C2013: 24°C2014: 24°C2015: 23°C2016: 24°C2017: 23°C2018: 24°C2019: 24°C2020: 24°C2021: 24°C2022: 24°C2023: 24°C2024: 24°C2025: 24°C 2026 forecast: 20°C current forecast 20°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 4-10 Sept period averaged 23°C by day. The coolest year was 1982 (21°C) and the warmest was 1988 (25°C). The current forecast averages 20°C - lower than in 100% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Cook Islands

Cook Islands - 14-day weather forecast infographic

Day-by-day forecast for Cook Islands

Saturday5 September 2026
🌧️20°light rain
night 20° · evening 21° · rain 1.95 mm · humidity 80% · wind 9 m/s · clouds 34%
Sunday6 September 2026
🌧️20°moderate rain
night 19° · evening 20° · rain 10.05 mm · humidity 80% · wind 8 m/s · clouds 49%
Monday7 September 2026
🌧️19°light rain
night 19° · evening 19° · rain 0.24 mm · humidity 78% · wind 10 m/s · clouds 98%
Tuesday8 September 2026
🌧️20°light rain
night 20° · evening 20° · rain 1.14 mm · humidity 79% · wind 9 m/s · clouds 96%
Wednesday9 September 2026
🌧️20°light rain
night 20° · evening 20° · rain 2.62 mm · humidity 75% · wind 8 m/s · clouds 19%
Thursday10 September 2026
☀️19°clear sky
night 20° · evening 20° · rain 0.18 mm · humidity 71% · wind 5 m/s · clouds 98%
Friday11 September 2026
🌧️20°light rain
night 20° · evening 20° · rain 0.11 mm · humidity 75% · wind 4 m/s · clouds 99%
Saturday12 September 2026
🌧️20°light rain
night 20° · evening 20° · rain 5.51 mm · humidity 78% · wind 6 m/s · clouds 9%
Sunday13 September 2026
🌧️19°light rain
night 19° · evening 20° · rain 1.89 mm · humidity 80% · wind 5 m/s · clouds 11%
Monday14 September 2026
🌤️19°a few clouds
night 18° · evening 19° · rain 0.13 mm · humidity 64% · wind 4 m/s · clouds 18%
Tuesday15 September 2026
🌧️18°light rain
night 18° · evening 19° · rain 0.31 mm · humidity 58% · wind 6 m/s · clouds 82%
Wednesday16 September 2026
🌧️18°light rain
night 18° · evening 18° · rain 0.8 mm · humidity 77% · wind 9 m/s · clouds 96%
Thursday17 September 2026
🌤️17°a few clouds
night 17° · evening 17° · rain 2.46 mm · humidity 65% · wind 7 m/s · clouds 14%
Friday18 September 2026
🌧️17°light rain
night 17° · evening 17° · rain 0.73 mm · humidity 57% · wind 6 m/s · clouds 55%
Saturday19 September 2026
🌧️17°light rain
night 17° · evening 17° · rain 0.14 mm · humidity 62% · wind 6 m/s · clouds 100%
Sunday20 September 2026
🌧️18°light rain
night 18° · evening 18° · rain 0.3 mm · humidity 62% · wind 9 m/s · clouds 42%

Sea temperature - Cook Islands

Water today
23°C
Week avg
23°C
Waves today
2.6 m
How's the water?
pleasant
16-day sea temperature forecast:
5.09 23°C6.09 23°C7.09 23°C8.09 23°C9.09 23°C10.09 24°C11.09 24°C12.09 23°C13.09 24°C
Average sea temperature through the year:
Jan 27°CFeb 28°CMar 29°CApr 28°CMay 27°CJun 26°CJul 25°CAug 25°CSep 25°COct 25°CNov 25°CDec 26°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Weather in other countries in Oceania

FijiCocosFrench PolynesiaChristmas IslandGuamAustralia

FAQ - Cook Islands weather

What is the weather like in Cook Islands today?
Today it is about 20° during the day and 20° at night, light rain.
How far ahead can I check the forecast for Cook Islands?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.