West Island climate

Name: West Island
Address: CC

West Island is warmest in April, with average highs of 28 °C, and coldest in September, when nights average 25 °C. March is the wettest month (207 mm) and October the driest (54 mm). Figures are 1991–2020 climate normals.

Across a full year West Island averages 1,483 mm of rain and 353 days above 25 °C.

Cocos Islands · population 120 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month April 28 °C
Coldest month September 25 °C
Driest month October 54 mm
Wettest month March 207 mm
Least cloud August 55 % cloud
Hottest on record May 29 °C
Coldest on record September 23 °C
Warmest sea March 29 °C

What to expectWest Island through the year

West Island changes little through the year. Average daily highs stay between 26 and 28 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 353 days a year reach 25 °C. The warmest reading in the 1991–2020 record is 29 °C, in May.

Rain is strongly seasonal. March averages 207 mm against 54 mm in October — 3.9 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off West Island is warmest in March at 29 °C and coldest in September at 27 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	27.0 °C	119 mm	59 %
February	27.4 °C	178 mm	63 %
March	27.5 °C	207 mm	64 %
April	27.5 °C	199 mm	62 %
May	27.3 °C	135 mm	58 %
June	26.8 °C	125 mm	58 %
July	26.3 °C	122 mm	59 %
August	25.9 °C	72 mm	55 %
September	25.7 °C	59 mm	57 %
October	25.9 °C	54 mm	56 %
November	26.2 °C	94 mm	61 %
December	26.5 °C	118 mm	61 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C
January	27.0 °C	25.7 °C	26.4 °C	29.2 °C	23.7 °C	31
February	27.4 °C	26.0 °C	26.7 °C	29.1 °C	23.0 °C	28
March	27.5 °C	26.0 °C	26.8 °C	29.1 °C	24.0 °C	31
April	27.5 °C	26.1 °C	26.9 °C	29.3 °C	24.6 °C	30
May	27.3 °C	26.0 °C	26.7 °C	29.4 °C	23.6 °C	31
June	26.8 °C	25.6 °C	26.3 °C	28.6 °C	23.7 °C	30
July	26.3 °C	25.1 °C	25.7 °C	28.6 °C	22.9 °C	30
August	25.9 °C	24.8 °C	25.4 °C	27.5 °C	23.1 °C	28
September	25.7 °C	24.6 °C	25.2 °C	27.5 °C	22.7 °C	26
October	25.9 °C	24.9 °C	25.4 °C	27.9 °C	22.8 °C	28
November	26.2 °C	25.2 °C	25.8 °C	28.1 °C	23.3 °C	29
December	26.5 °C	25.4 °C	26.0 °C	28.3 °C	23.6 °C	31

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	119 mm	13	13 h/day	59 %	79 %	25 km/h	28.0 °C
February	178 mm	16	13 h/day	63 %	80 %	24 km/h	28.4 °C
March	207 mm	20	12 h/day	64 %	82 %	26 km/h	28.6 °C
April	199 mm	19	12 h/day	62 %	82 %	29 km/h	28.5 °C
May	135 mm	18	12 h/day	58 %	82 %	32 km/h	28.2 °C
June	125 mm	18	11 h/day	58 %	81 %	34 km/h	27.7 °C
July	122 mm	18	11 h/day	59 %	80 %	36 km/h	27.2 °C
August	72 mm	14	12 h/day	55 %	78 %	36 km/h	26.8 °C
September	59 mm	9	12 h/day	57 %	77 %	35 km/h	26.5 °C
October	54 mm	7	12 h/day	56 %	78 %	33 km/h	26.7 °C
November	94 mm	8	13 h/day	61 %	78 %	32 km/h	26.9 °C
December	118 mm	10	13 h/day	61 %	78 %	29 km/h	27.3 °C

Where West Island ranks

Ranking	Position	Value
Best beach destinations in Asia in October	36th of 50	90/100
Best beach destinations in Asia in September	38th of 50	86/100
Best beach destinations in Asia year-round	45th of 50	77/100

Planning a trip? See the best time to visit West Island.

QuestionsCommon questions about West Island’s climate

When is the best time to visit West Island?

That depends on what you want, so the honest answer is a comparison rather than a single month. August, September, October sit closest to 20 °C on average, April is the warmest month and October the driest. The month-by-month table above has the full picture.

How hot does West Island get?

In April, the warmest month, daily highs average 28 °C. The highest value in the 1991–2020 record is 29 °C.

How cold does it get in winter?

Nights average 25 °C in September, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in West Island?

March, averaging 207 mm over 20 days with rain. The driest month is October with 54 mm. The year as a whole averages 1,483 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in West Island rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: -12.157°, 96.823° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.