SeasonMapAitutaki weather in September
Cook Islands
September in Aitutaki: warm, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Aitutaki · #407 of 1383 destinations to visit in September · comfort 86/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Aitutaki in September
Other months in Aitutaki
Aitutaki's forum calls August comfortable but rarely warm at night — regulars say a long-sleeved top is worth packing for evenings on the beach front. Any rain tends to be a short, 10-minute downpour before it clears again, and while the water is a little coolish for August, most snorkelers manage fine in a t-shirt and shorts.
Add your own note from Aitutaki's card on the map.
Aitutaki climate normals — September
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 24°C / 75°F | |
| Feels like (high) | 26°C / 79°F | |
| Sea temperature | 26°C / 79°F | 😎 warm sea |
| Rainfall | 72 mm / 2.9 in | 🌦 some rain |
| Rainy days | 12 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 20°C / 68°F | |
| Sunshine | 10.3 h/day | |
| Daylight | 12 h | |
| Wind | 31 km/h / 19 mph | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Aitutaki in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyDrier, cooler half of the year, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Aitutaki's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherAitutaki's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in Aitutaki in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Drier, cooler half of the year
1 May – 31 OctDry seasonCrowdedMay to October is the drier half and the island's high season. The lagoon is glassiest early; the trade wind gets up over the flats most afternoons.
- Nature
Humpback whale season
15 Jul – 15 Oct · usuallyHumpbacks pass outside the reef between July and October. There is no shelf here, so the boats are in deep water within minutes of leaving the pass. Source ↗
Nearby, and something's on
Within 300 km of Aitutaki — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Aitutaki?
Aitutaki in September — FAQ
- Is September a good time to visit Aitutaki?
- September in Aitutaki: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Aitutaki on SeasonMap's comfort score (86/100).
- What is the weather like in Aitutaki in September?
- In September, Aitutaki averages a daily high of 24.8°C and a low of 23.7°C, with about 72.4 mm of rain over roughly 11.8 rainy days.
- What is the air quality in Aitutaki in September?
- Aitutaki has a mean US Air Quality Index of about 50 in September.
Other months in Aitutaki
Compare Aitutaki in September
Warmer or cooler than Aitutaki in September
Similar destinations in Pacific — September
Within 300 km: Avarua's Humpback whale season around 15 Jul – 15 Oct, and Rarotonga's Humpback whale season around 15 Jul – 15 Oct.