September
Weather in Cook Islands for September 2025
Your guide to Cook Islands weather in September - trends and predictions
Until now, September 2025 in Cook Islands has been nearly identical to the historical average, with a temperature of 22.5 °C (showing only a slight deviation of -0.1 °C).
The forecast for the next days in Cook Islands predicts temperatures to be around 22 °C, close to the historical average.
In general, the average temperature in Cook Islands at the beginning of September is 22.4 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 23 °C by the end of September.
Cook Islands in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 134.5 mm.
Temperatures
Rain 🌧️
14
Dry days
16
Rainy days
0
Snow days
22°/22°
Temperatures
32 km/h
Avg max wind
74 %
Avg humidity
Cook Islands Weather September
Move between months or click on a day
Temperatures trend during September in Cook Islands
See the weather trend as well as the moving average line
September weather in Cook Islands day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 23° /21° | 2 mm | 6 | |
| 2 Sept. | Light rain shower | 22° /20° | 46.4 mm | 6 | |
| 3 Sept. |  Cloudy | 22° /21° | 2.1 mm | 6 | |
| 4 Sept. | Patchy rain possible | 22° /21° | 2.3 mm | 6 | |
| 5 Sept. | Light rain shower | 22° /21° | 1.3 mm | 6 | |
| 6 Sept. | Light rain shower | 23° /21° | 5.3 mm | 6 | |
| 7 Sept. | Light rain shower | 23° /21° | 8.5 mm | 6 | |
| 8 Sept. | Patchy rain possible | 23° /22° | 6.9 mm | 6 | |
| 9 Sept. | Patchy rain possible | 23° /22° | 1.9 mm | 6 | |
| 10 Sept. | Light rain shower | 23° /22° | 2.4 mm | 6 | |
| 11 Sept. | Cloudy | 22° /21° | 1 mm | 6 | |
| 12 Sept. | Patchy rain possible | 23° /21° | 0.4 mm | 6 | |
| 13 Sept. | Cloudy | 23° /21° | 1 mm | 6 | |
| 14 Sept. | Patchy rain possible | 23° /21° | 0.5 mm | 6 | |
| 15 Sept. | Cloudy | 23° /22° | 0.3 mm | 6 | |
| 16 Sept. | Patchy rain possible | 22° /21° | 0.7 mm | 2.4 | |
| 17 Sept. |  Moderate rain | 22° /21° | 16.6 mm | 0.9 | |
| 18 Sept. |  Heavy rain | 24° /20° | 143.4 mm | 0.2 | |
| 19 Sept. | Patchy rain possible | 23° /22° | 0.5 mm | 0 | |
| 20 Sept. | Patchy rain possible | 22° /21° | 0.2 mm | 6 | |
| 21 Sept. |  Overcast | 21° /21° | 0.1 mm | 6 | |
| 22 Sept. | Overcast | 21° /21° | 0.1 mm | 6 | |
| 23 Sept. | Overcast | 21° /21° | 0 mm | 6 | |
| 24 Sept. | Patchy rain possible | 22° /21° | 2.2 mm | 6 | |
| 25 Sept. | Patchy rain possible | 23° /22° | 1.3 mm | 6 | |
| 26 Sept. | Patchy rain possible | 23° /23° | 0.4 mm | 6 | |
| 27 Sept. | Heavy rain | 23° /22° | 20.8 mm | 6 | |
| 28 Sept. | Patchy rain possible | 24° /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.
Change Month
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 22°, suitable for diverse activities and preferences.
How much rainfall should be expected in Cook Islands during September?
Significant rainfall exceeding 134.5 mm is expected in Cook Islands during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Cook Islands during September?
The average wind speed in Cook Islands during September is 32 km/h, suggesting breezy to windy conditions, depending on your activities.
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 ☀️
Top locations in Cook Islands
Select a location for an accurate weather forecast
More Locations Quick links
More Cook Islands weather pages
You are here
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.
Found a mistake?
We appreciate your attention to details. Tell us here.