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Monthly climate in West Bay, Cayman Islands

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification West Bay features a tropical savanna climate (Aw). Temperatures typically range between 26 °C (78 °F) and 29 °C (84 °F) through the year, but rarely can drop to 21 °C (70 °F) or can rise to as high as 30 °C (86 °F). The average annual precipitation amounts to about 1062 mm (41.8 inches) and receives 160 rainy days on the 1 mm (0.04 inches) threshold annually. West Bay enjoys an average of 3777 hours of sunshine throughout the year, and daylight varies from 10 hours 58 minutes to 13 hours 16 minutes per day.

Monthly average temperatures in West Bay, Cayman Islands

The warmest months in West Bay are July, August and September, with daily mean temperatures ranging from 28 to 29 °C (83 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 26 to 26 °C (78 - 79 °F) throughout the day. On average each year, West Bay experiences 326 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in West Bay. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum28°C
(82°F)		27°C
(81°F)		27°C
(82°F)		28°C
(84°F)		29°C
(84°F)		29°C
(85°F)		30°C
(86°F)		30°C
(86°F)		30°C
(86°F)		30°C
(86°F)		29°C
(84°F)		28°C
(83°F)
Mean maximum27°C
(81°F)		27°C
(81°F)		27°C
(81°F)		28°C
(82°F)		29°C
(84°F)		29°C
(84°F)		30°C
(86°F)		30°C
(86°F)		30°C
(86°F)		29°C
(85°F)		29°C
(84°F)		28°C
(82°F)
Average high26°C
(79°F)		26°C
(80°F)		26°C
(80°F)		27°C
(81°F)		28°C
(82°F)		28°C
(83°F)		29°C
(84°F)		29°C
(85°F)		29°C
(85°F)		28°C
(84°F)		28°C
(82°F)		27°C
(81°F)
Daily mean26°C
(78°F)		26°C
(79°F)		26°C
(79°F)		26°C
(80°F)		27°C
(81°F)		28°C
(82°F)		28°C
(83°F)		29°C
(84°F)		28°C
(83°F)		28°C
(82°F)		27°C
(81°F)		26°C
(80°F)
Average low25°C
(77°F)		25°C
(78°F)		25°C
(78°F)		26°C
(79°F)		26°C
(80°F)		27°C
(81°F)		27°C
(82°F)		28°C
(82°F)		27°C
(82°F)		27°C
(80°F)		26°C
(80°F)		26°C
(78°F)
Mean minimum23°C
(73°F)		23°C
(73°F)		24°C
(75°F)		24°C
(76°F)		25°C
(77°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		26°C
(78°F)		25°C
(77°F)		24°C
(75°F)
Minimum21°C
(70°F)		21°C
(70°F)		23°C
(73°F)		24°C
(75°F)		25°C
(76°F)		25°C
(78°F)		25°C
(77°F)		25°C
(77°F)		26°C
(78°F)		25°C
(78°F)		24°C
(76°F)		23°C
(73°F)

Compare climate in West Bay with other places

Compare temperature, precipitation, sunshine, UV index in West Bay, Cayman Islands with other places around the world.

Monthly average precipitation in West Bay, Cayman Islands

West Bay usually has the most precipitation in May, October and November, with an average of 18 rainy days and 186 mm (7.3 inches) of precipitation per month. The driest months in West Bay are February, March and April. On average, 23 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in West Bay. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)39 (1.5)24 (1.0)19 (0.8)25 (1.0)130 (5.1)87 (3.4)55 (2.2)105 (4.1)102 (4.0)254 (10.0)174 (6.9)46 (1.8)
Average precipitation days (≥ 1 mm)118671512141618231812

Monthly sunshine hours in West Bay, Cayman Islands

The sunniest months in West Bay are April, May and July, when the sun shines an average of 11 hours 12 minutes a day. Least sunny months in West Bay: January, October and November receive an average of 9 hours 1 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in West Bay. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours246298336341342321347334321293289302
Mean daily daylight hours11h 5m11h 30m12h 2m12h 35m13h 2m13h 16m13h 8m12h 44m12h 12m11h 40m11h 12m10h 58m

Solar UV radiation in West Bay, Cayman Islands

West Bay experiences the highest level of ultraviolet (UV) radiation in April, May and June, when the maximum UV index can reach values of 13 - 13, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 9. For more detailed information, check out our hourly West Bay UV Index data.

Average daily maximum UV levels by month for West Bay. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)910121313131212121198