September
Weather in Cook Islands for September 2025
Your guide to Cook Islands weather in September - trends and predictions
In general, the average temperature in Cook Islands at the beginning of September is 22.6 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 22.7 °C by the end of September.
Cook Islands experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
Is September a good time to visit Cook Islands? check out the best time to travel to Cook Islands page.
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7
Dry days
23
Rainy days
0
Snow days
22°/21°
Temperatures
36 km/h
Avg max wind
70 %
Avg humidity
Cook Islands in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  22° | 2 22° | 3  22° | 4 23° | 5 23° | 6 23° | 7 23° |
| 8  23° | 9 23° | 10 23° | 11 22° | 12 23° | 13 23° | 14 23° |
| 15 23° | 16 23° | 17 23° | 18  23° | 19 23° | 20 22° | 21 22° |
| 22 21° | 23 22° | 24 22° | 25 23° | 26 22° | 27 23° | 28 23° |
| 29 23° | 30 23° |
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Temperatures trend during September in Cook Islands
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 22° /21° | 2.8 mm | 6 | |
| 2 Sept. | Light rain shower | 22° /20° | 69.6 mm | 6 | |
| 3 Sept. | Cloudy | 22° /21° | 3.2 mm | 6 | |
| 4 Sept. | Light rain shower | 23° /22° | 3.1 mm | 6 | |
| 5 Sept. | Light rain shower | 23° /21° | 1.3 mm | 6 | |
| 6 Sept. | Light rain shower | 23° /22° | 7.4 mm | 6 | |
| 7 Sept. | Light rain shower | 23° /22° | 12.7 mm | 6 | |
| 8 Sept. | Moderate or heavy rain shower | 23° /22° | 10.3 mm | 6 | |
| 9 Sept. | Light rain shower | 23° /22° | 2.9 mm | 6 | |
| 10 Sept. | Light rain shower | 23° /22° | 3.6 mm | 6 | |
| 11 Sept. | Cloudy | 22° /21° | 0.6 mm | 6 | |
| 12 Sept. | Cloudy | 23° /21° | 0.3 mm | 6 | |
| 13 Sept. | Cloudy | 23° /21° | 0.1 mm | 6 | |
| 14 Sept. | Cloudy | 23° /22° | 0.5 mm | 6 | |
| 15 Sept. | Cloudy | 23° /22° | 0.3 mm | 6 | |
| 16 Sept. | Patchy rain possible | 23° /22° | 0.7 mm | 6 | |
| 17 Sept. | Patchy rain possible | 23° /22° | 1.6 mm | 6 | |
| 18 Sept. | Partly cloudy | 23° /21° | 2.5 mm | 6 | |
| 19 Sept. | Patchy rain possible | 23° /21° | 1.3 mm | 6 | |
| 20 Sept. | Patchy rain possible | 22° /20° | 2.3 mm | 6 | |
| 21 Sept. | Light rain shower | 22° /21° | 0.8 mm | 6 | |
| 22 Sept. | Patchy rain possible | 21° /20° | 0.2 mm | 6 | |
| 23 Sept. | Patchy rain possible | 22° /21° | 0 mm | 6 | |
| 24 Sept. | Patchy rain possible | 22° /21° | 2.5 mm | 6 | |
| 25 Sept. | Light rain shower | 23° /21° | 0.6 mm | 6 | |
| 26 Sept. | Patchy rain possible | 22° /21° | 0.3 mm | 6 | |
| 27 Sept. | Patchy rain possible | 23° /22° | 0.4 mm | 6 | |
| 28 Sept. | Light rain shower | 23° /22° | 1.7 mm | 6 | |
| 29 Sept. | Patchy rain possible | 23° /22° | 0.3 mm | 6 | |
| 30 Sept. | Patchy rain possible | 23° /22° | 0.4 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Cook Islands in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cook Islands forecast closer to your planned date for the most up-to-date weather information.
Cook Islands in September - FAQ
What are the expected maximum and minimum temperatures in Cook Islands during September?
During September, expect a variety of temperatures with highs around 22° and lows near 21°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cook Islands during September?
Moderate rainfall is anticipated in Cook Islands during September, with a total of 80.4 mm spread over approximately 23 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Cook Islands during September?
The average wind speed in Cook Islands during September is 36 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Cook Islands in September?
As you prepare for your trip to Cook Islands in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Cook Islands, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Cook Islands
Explore the daily rainfall trends and prepare for Cook Islandss September weather 💧
UV exposure in Cook Islands during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Cook Islands?Get accurate weather forecasts for Cook Islands, located at latitude -21.208 and longitude -159.775. Stay updated with localized weather information tailored for Cook Islands.
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