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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Pulse Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
The Cook Islands have a tropical maritime climate with warm, stable temperatures year-round. The year splits into a wetter, more humid season from November to April and a drier, sunnier season from May to October. For the most reliable fine weather, aim for June through September, as shown in the live forecast above.
What is the wet and dry season like?
The wet season (November to April) brings higher humidity, more frequent rain and the possibility of tropical cyclones, though most storms pass north of the islands. Daytime highs sit around 28–30°C. The dry season (May to October) is cooler and less humid, with daytime temperatures averaging 24–27°C and south-east trade winds keeping the air fresh. Rainfall is lower, especially from July to September.
When is the best time to visit?
June to September offers the most comfortable conditions for outdoor activities: lower humidity, plenty of sunshine and sea temperatures around 24–26°C. The weather in Cook Islands in June and September is particularly pleasant. May and October are transition months and can still be good. For a 10-day outlook, refer to the live forecast above. Water temperature by month stays above 23°C year-round, peaking at 27–28°C in February and March.
What is the weather in Cook Islands in June?
June is early in the dry season: warm days around 25–27°C, low humidity, and minimal rain. Trade winds keep it comfortable. Sea temperatures are about 24°C, ideal for swimming.
How does September compare?
September is similar to June – still dry and sunny, with daytime highs near 26°C. It’s one of the best months for clear skies and calm seas, with water around 24–25°C.
What is the water temperature by month?
Water temperatures range from 23°C in August to 28°C in February and March. The coolest months (July–September) still offer comfortable swimming, while the warmest months align with the wet season.
For Australian comparisons, see the Australia weather hub or check conditions for Brisbane Weather if you’re planning a trip from Queensland.