Cook Islands Weather by Month. The Cook Islands Weather Map below shows the weather forecast for the next 10 days. The Cook Islands Weather Map below shows the weather forecast for the next 12 days. The best time of year to visit Aitutaki in Cook Islands Aitutaki has a tropical rainforest climate with only one clear distinct season which is the rainy season. The climate comfortable in that area this month. January falls in the middle of the South Pacific's cyclone season from November to April. How warm is the sea around the Cook Islands in November? Occasionally, the night temperature in Rarotonga and Mangaia can plunge to 15 °C (59 °F). the Cook Islands has some very humid months, and high humidity throughout the year. The least humid month is August (72.3% relative humidity), and the most humid month is March (79.3%). The increased humidity also means more mosquitos; especially prevalent in the morning and early evening hours. The highest average temperature in Cook Islands is 27°C in january and the lowest is 23°C in august. It is quite hot and humid during this time with frequent afternoon downpours. It should be noted an improvement from the previous month since in june it receives an average of 3.1in of rainfall over 9 days. Contact Info. Book your Cook Islands Vacation with Goway! Be prepared with the most accurate 10-day forecast for Avarua, Rarotonga, Cook Islands with highs, lows, chance of precipitation from The Weather Channel and Weather.com The average climate figure for Cook Islands is an 7,9. Unfortunately, the weather conditions is worsening than the previous month since in december there is an average of 8in of rainfall over 16 days. The hottest time of year in Avarua, Cook Islands is normally February. When to Go in Cook Islands Rarotonga and Aitutaki, which are about as far south of the equator as the Hawaiian Islands are north of it, enjoy a tropical climate. Located in the heart of the South Pacific Ocean and often referred to as the jewel in the crown of the South Pacific, the Cook Islands enjoy warm weather and a tropical climate year round. Weather in the Cook Islands? Cook Islands weather. This rainy season lasts from October till the beginning of May and Tropical storms and hurricanes can occur. With a wide choice of Cook Islands vacations and experiences, Goway’s Downunder wizards can offer you many ways to explore, and enjoy the Cook Islands.Relax with a romantic tropical island stay, escape winter on a Snowbird long stay, enjoy an air-land getaway and more. On average, it is maximum 26° in december in Cook Islands and at least around 25° degrees. Average Weather in Avarua Cook Islands In Avarua, the summers are warm, oppressive, wet, and overcast; the winters are comfortable, muggy, and partly cloudy; and it is windy year round. Weather Cook Islands - Weather forecast: - for today, - for tomorrow, - for a week, - for a month. Daytime temperatures usually reach 27°C in Avarua, Cook Islands in November with moderate heat and humidity, falling to 21°C at night. The Cook Islands (Cook Islands Māori: KÅ«ki 'Āirani) is a self-governing island country in the South Pacific Ocean in free association with New Zealand.It comprises 15 islands whose total land area is 240 square kilometres (93 sq mi). Located right in the heart of the South Pacific Ocean, the Cook Islands enjoy a beautifully warm, tropical climate all year round. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Rarotonga Muri area. Severe Weather. Other forecasts in Oceania: American Samoa Christmas Island Cocos Keeling Islands Cook Islands Fiji French Polynesia Guam Kiribati Marshall Islands Micronesia Nauru New Caledonia New Zealand Niue Norfolk Island Northern Mariana Islands Palau Pitcairn Samoa Solomon Islands Tokelau Tonga Tuvalu Vanuatu Wake Island Wallis and Futuna Islands The climate of the Cook Islands, an archipelago in the Pacific Ocean located south of the Equator, "free association" with New Zealand, is tropical, with a rainy period from December to March and a relatively dry period from June to September, without there being a real dry season. Select from the other forecast maps (on the right) to view the temperature, cloud cover, wind and precipitation for … The high seasonal norm is 85°F. Magnificent lagoon area - one of the world's most beautiful scenes; Atiu scenery - island of birds & rich cultural heritage; Mangaia - Haunting beauty, intriguing history. The average maximum temperatures vary between 25 ° C and 29 ° C, while the average minimum temperatures vary between 18 ° C in July and August and 23 ° C in January and February. Wind in the Cook Islands is usually calm. using Weatherbase's weather averages and normals. In december there are 21 days of rainfall with a total of 153 mm and the it will be dry 10 days this month in Cook Islands. Climate of Cook islands in july The climate of Cook islands in july is good In july in Cook islands, the climate is rather dry (with 2.6in of precipitation over 7 days). In short, the dry season from June to August is the coldest but also the most popular time to travel to Rarotonga. Weather Cook Islands december. Weather in Rarotonga and Aitutaki Whilst there are slight variances in the temperatures and rainfall between each of the Cook Islands, the averages tend to be about the same. Mobile Apps. 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