West Island in Summer
In summer (December, January and February), West Island sees average daytime highs around 27°C and overnight lows near 26°C, with 402 mm of rain over about 39 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Across summer, daytime highs hold fairly steady around 27°C. The sky is clear or mostly clear about 33% of the time across summer, and the air most often feels oppressive.
Summer is West Island's 2nd-best season to visit on our travel score. West Island has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see West Island's year-round climate.
- Avg daytime high
- 27°C
- 2nd-warmest season
- Avg overnight low
- 26°C
- Rainfall
- 402 mm
- 39 wet days
- Avg wind
- 21 km/h
- Travel score
- 6.0
- 2nd-best season
- Months
- Dec · Jan · Feb
Temperature in West Island in Summer
Across summer, daytime highs hold fairly steady around 27°C.
A typical summer day in West Island reaches about 27°C and drops to 26°C overnight. The warmest of the three months is February, the coolest December.
West Island weather by month
How the three summer months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 26° | 114 | 13.3 | 12.6 | 6.0 |
| Feb | 27° / 26° | 177 | 15.6 | 12.4 | 5.4 |
| Mar | 28° / 26° | 201 | 20.6 | 12.1 | 4.9 |
| Apr | 28° / 26° | 196 | 20.2 | 11.7 | 4.9 |
| May | 27° / 26° | 132 | 18.7 | 11.4 | 5.3 |
| Jun | 27° / 26° | 133 | 17.3 | 11.3 | 5.4 |
| Jul | 26° / 25° | 120 | 17.6 | 11.4 | 5.6 |
| Aug | 26° / 25° | 62 | 14.1 | 11.6 | 6.2 |
| Sep | 26° / 25° | 58 | 8.7 | 11.9 | 6.9 |
| Oct | 26° / 25° | 48 | 7 | 12.3 | 7.2 |
| Nov | 26° / 25° | 94 | 8.2 | 12.6 | 6.9 |
| Dec | 27° / 26° | 112 | 10.5 | 12.7 | 6.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 33% of the time across summer.
Chance of precipitation in Summer
West Island gets around 402 mm of rain over 39 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 21 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 42 min in early December to 12 h 18 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.3 kWh/m².
Is summer a good time to visit West Island?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit West Island for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for West Island in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, West Island sees daytime highs around 27°C and nights near 26°C. Pack light clothes, rain gear and sun protection. Worth having: a windbreaker. About 39 days see rain.
Sea temperature near West Island in Summer
The nearest coast averages about 28°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in March at about 29°C and coldest in September near 27°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 28 | 28 | 29 | 29 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm | Warm | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Tropical |
| Feb | 28 | Tropical |
| Mar | 29 | Tropical |
| Apr | 29 | Tropical |
| May | 28 | Tropical |
| Jun | 28 | Warm |
| Jul | 27 | Warm |
| Aug | 27 | Warm |
| Sep | 27 | Warm |
| Oct | 27 | Warm |
| Nov | 27 | Warm |
| Dec | 27 | Warm |
UV index in West Island in Summer
Clear-sky midday UV across summer averages around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in West Island peaks around January 24 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 9 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 15 | 15 | 12 | 10 | 9 | 10 | 11 | 13 | 14 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 15 | Extreme |
| Mar | 15 | Extreme |
| Apr | 12 | Extreme |
| May | 10 | Extreme |
| Jun | 9 | Very high |
| Jul | 10 | Very high |
| Aug | 11 | Extreme |
| Sep | 13 | Extreme |
| Oct | 14 | Extreme |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Where is West Island?
West Island sits at 12.2°S, 96.8°E, 12 m above sea level, in Cocos Islands. The nearest listed city is Flying Fish Cove, 985 km away.
Topography around West Island
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of West Island.
Within 3 km, the terrain around West Island has only modest variations in elevation — a maximum elevation change of 18 m around an average of 1 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 18 m; within 80 km, only modest variations in elevation — a maximum elevation change of 15 m.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for West Island (-12.1568°, 96.8225°, elevation 12 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.