SeasonMapWest Island (Keeling Islands) weather in December
Cocos (Keeling) Islands
December in West Island: warm, rainy, with clean air — an excellent time to visit.
#5 of 12 months in West Island · #435 of 1383 destinations to visit in December · comfort 81/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on West Island in December
No notes yet. Open West Island on the map to add the first one.
West Island climate normals — December
| Daytime high | 27°C / 80°F | 🌤 warm |
|---|---|---|
| Nighttime low | 26°C / 78°F | |
| Sea temperature | 28°C / 82°F | 😎 warm sea |
| Rainfall | 137 mm / 5.4 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 22°C / 72°F | |
| Sunshine | 10.9 h/day | |
| Daylight | 12.8 h | |
| Wind | 28 km/h / 18 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in West Island in December
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 5 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 December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Cyclone season
1 Nov – 30 Apr · usuallyCyclones in this part of the Indian Ocean are likeliest in the early months of the year. Direct hits on the atoll are rare, but a system passing nearby still grounds the flight and stirs up the lagoon crossing between the two inhabited islands. Source ↗
- Nature
Reef fish spawning season
1 Dec – 28 Feb · usuallyWildlife seasonThe islands' one dive operator times trips to the reef's summer breeding activity: giant triggerfish nesting at Canyons and bump-head parrotfish gathering to spawn at Cologne Gardens, both easiest to see across December to February. Source ↗
Where is West Island?
West Island in December — FAQ
- Is December a good time to visit West Island?
- December in West Island: warm, rainy, with clean air — an excellent time to visit. It ranks #5 of 12 months for West Island on SeasonMap's comfort score (81/100).
- What is the weather like in West Island in December?
- In December, West Island averages a daily high of 26.8°C and a low of 25.7°C, with about 137.2 mm of rain over roughly 12 rainy days.
- What is the air quality in West Island in December?
- West Island has a mean US Air Quality Index of about 42 in December.