Cook islands in september: average Weather, Temperature and Climate, Where to go?
Weather in Cook islands in september 2025
Here, find the the weather forecast for september for most popular cities in Cook islands. These forecasts are probabilities for the month of september from weather reports for many years. The percentage indicates the probability of having the weather mentioned.
Average weather in september in Avarua
good weather UV index: 6
Weather at 6am
76°F
Moderate rain at times
34% of time
33%
14%
14%
Weather at 12pm
76°F
Partly Cloudy
34% of time
25%
21%
15%
Weather at 6pm
76°F
Partly Cloudy
36% of time
25%
18%
18%
Weather at 3am
76°F
34%
31%
19%
15%
Where to go in Cook islands in september?
Where to go in Cook islands in september: destination map
perfect weather
good
tolerable
bad
very bad
Where should you go in Cook islands in september when it comes to the weather?
Remember:
The climate in Cook islands in september is good across the board.
Good news: It is not ideal 100%, but the weather in Cook islands in september is, according to seasonal norms, quite good in Rarotonga island, Avarua, Mitiaro island, Mangaia island, Palmerston island, Mauke island, Aitutaki island, Penrhyn island and Atiu island. I allows to enjoy vacation in these areas. And even why not take a little time to enjoy the hotel pool!
If you do not go lazing in the sun, but, for example to discover the heritage, the cities of Rakahanga island, Manihiki island and Pukapuka island have a OK but just acceptable weather for it in september.
Climate in Cook islands in september
Climate in Avarua in september
In the month of september, maximum temperature is 76°F and minimum temperature is 74°F (for an average temperature of 76°F). The climate is quite nice in this city in this month. With 3.4in over 4 days, you will experience some showers for your holidays. But this is pretty moderate and it is only of temporary showers.
With a good climate, the month of september is a good time to go in Avarua in Cook islands.
| September | |||
| Average temperature | 76°F | ||
| Highest temperature | 76°F | ||
| Lowest temperature | 74°F | ||
| Sea temperature | 77°F | ||
| Rainfall | 3.4in | ||
| Number of days with rainfall | 4 day(s) (14%) | ||
| Humidity | 80% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 50% | ||
| Length of day | 11:58 | ||
| Our opinion at whereandwhen.net | good |
Climate in Palmerston island in september
In the month of september, the mean temperature in Palmerston island is 77°F (maximum temperature is 79°F and minimum temperature is 77°F). The climate is pleasant in that locality in the month of september. With 3.2in over 4 days, rain may occur during your vacations. But this is pretty moderate and it will not be continuous.
With a good weather, september is a good time to go in Palmerston island in Cook islands.
| September | |||
| Average temperature | 77°F | ||
| Highest temperature | 79°F | ||
| Lowest temperature | 77°F | ||
| Rainfall | 3.2in | ||
| Number of days with rainfall | 4 day(s) (14%) | ||
| Humidity | 80% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 49% | ||
| Length of day | 12:00 | ||
| Our opinion at whereandwhen.net | good |
Climate in Rarotonga island in september
In the month of september, the mean temperature in Rarotonga island is 76°F (maximum temperature is 76°F and minimum temperature is 74°F). The climate is quite pleasant in that locality in this month. With 3.4in over 4 days, you risk getting wet slightly for your stay. But this is rather reasonably and you will not be too bothered by it.
With a good climate, the month of september is a good time to go in that area.
| September | |||
| Average temperature | 76°F | ||
| Highest temperature | 76°F | ||
| Lowest temperature | 74°F | ||
| Sea temperature | 77°F | ||
| Rainfall | 3.4in | ||
| Number of days with rainfall | 4 day(s) (14%) | ||
| Humidity | 80% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 50% | ||
| Length of day | 11:58 | ||
| Our opinion at whereandwhen.net | good |
Climate in Rakahanga island in september
In september, maximum temperature is 83°F and minimum temperature is 83°F (for an average temperature of 83°F). The climate is good in that area in the month of september. With 5.7in over 9 days, rainfall can happen throughout your stay. But this is reasonably and you will not be too bothered by it.
With a correct weather, september is okay (but not the best time) for traveling there in Cook islands.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 83°F | ||
| Lowest temperature | 83°F | ||
| Rainfall | 5.7in | ||
| Number of days with rainfall | 9 day(s) (31%) | ||
| Humidity | 78% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 43% | ||
| Length of day | 12:03 | ||
| Our opinion at whereandwhen.net | good |
Climate in Aitutaki island in september
In the month of september, maximum temperature is 79°F and minimum temperature is 77°F (for an average temperature of 77°F). The climate is good there in september. With 3.2in over 4 days, you will experience some showers during your vacations. But this is reasonably and it is only of temporary showers.
With a good weather, september is a good month to go in that area in Cook islands.
| September | |||
| Average temperature | 77°F | ||
| Highest temperature | 79°F | ||
| Lowest temperature | 77°F | ||
| Rainfall | 3.2in | ||
| Number of days with rainfall | 4 day(s) (14%) | ||
| Humidity | 80% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 49% | ||
| Length of day | 12:00 | ||
| Our opinion at whereandwhen.net | good |
All cities in Cook islands in september
| Avarua in september | good weather |
| Palmerston island in september | good weather |
| Rarotonga island in september | good weather |
| Rakahanga island in september | good weather |
| Aitutaki island in september | good weather |
| Atiu island in september | good weather |
| Mangaia island in september | good weather |
| Manihiki island in september | good weather |
| Mauke island in september | good weather |
| Mitiaro island in september | good weather |
| Penrhyn island in september | good weather |
| Pukapuka island in september | good weather |
Weather data for Cook islands in september:
Weather data for Cook islands in september is derived from an average of the weather forecast since 2009 in Cook islands. There is a margin of error and these forecasts are to be considered as general information only. The weather in Cook islands can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to Cook islands.