SeasonMapWest Island (Keeling Islands) weather in September
Cocos (Keeling) Islands
September in West Island: warm, a little rain, with muggy air — an excellent time to visit.
#4 of 12 months in West Island · #525 of 1383 destinations to visit in September · comfort 85/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on West Island in September
No notes yet. Open West Island on the map to add the first one.
West Island climate normals — September
| Daytime high | 26°C / 79°F | 🌤 warm |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Sea temperature | 26°C / 79°F | 😎 warm sea |
| Rainfall | 67 mm / 2.6 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 12 h | |
| Wind | 35 km/h / 22 mph | |
| Air quality (US AQI) | 62 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in West Island 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.
Shoulder seasonschool holidays in 2 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for West Island'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 weatherWest Island's weather doesn't swing hard through the year — comfort stays fairly steady in every month.
What's on in West Island in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Trade wind season
1 May – 31 Oct · usuallySoutheast trade winds hold for about nine months of the year, but the steadiest stretch for kitesurfing across the lagoon runs May to October. The rest of the year, the doldrums, brings lighter and far more variable wind. Source ↗
Where is West Island?
West Island in September — FAQ
- Is September a good time to visit West Island?
- September in West Island: warm, a little rain, with muggy air — an excellent time to visit. It ranks #4 of 12 months for West Island on SeasonMap's comfort score (85/100).
- What is the weather like in West Island in September?
- In September, West Island averages a daily high of 26°C and a low of 25°C, with about 66.7 mm of rain over roughly 9.8 rainy days.
- What is the air quality in West Island in September?
- West Island has a mean US Air Quality Index of about 62 in September.