Swimming in Cook islands in september 2025 Sea temperature by city in september
Do you want to go to the beach in Cook islands in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in Cook islands by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Cook islands in september 2025
Here, find the average sea temperature in Cook islands in september in several coastal cities.
77°F
min: 74°F / max: 80°F
76°F
min: 74°F / max: 80°F
Where should you go swimming in Cook islands in the month of september?
Swimming in Cook islands in september is pleasant
In september in Cook islands swimming conditions are generally the same everywhere.
As for Avarua and Rarotonga island, swimming is pleasant in september. The sea water is 77°F on average (min: 74°F/max: 80°F) so you can easily spend time in the water.
Where to go swimming in Cook islands in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Avarua
| September | |||
| Average sea temperature | 77°F | ||
| Minimum sea temperature | 74°F | ||
| Maximum sea temperature | 80°F | ||
| Average outside temperature | 76°F | ||
| Maximum outside temperature | 76°F | ||
| Minimum outside temperature | 74°F | ||
| Precipitation | 3.4in | ||
| Number of days of precipitation | 4 jour(s) (14%) | ||
| Cloud cover | 50% | ||
| Our opinion | pleasant swimming |
More information on swimming in Avarua in september
Rarotonga island
| September | |||
| Average sea temperature | 76°F | ||
| Minimum sea temperature | 74°F | ||
| Maximum sea temperature | 80°F | ||
| Average outside temperature | 76°F | ||
| Maximum outside temperature | 76°F | ||
| Minimum outside temperature | 74°F | ||
| Precipitation | 3.4in | ||
| Number of days of precipitation | 4 jour(s) (14%) | ||
| Cloud cover | 50% | ||
| Our opinion | pleasant swimming |
More information on swimming in Rarotonga island in september
List of coastal cities in Cook islands
| Avarua in september | pleasant swimming |
| Rarotonga island in september | pleasant swimming |