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West Bay, Cayman Islands climate
Aw Tropical savanna (dry winter)
West Bay has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is August with an average daily high near 32°C, while the coldest is February averaging around 22°C at night. Precipitation totals about 980 mm a year and is strongly seasonal — October alone averages 196 mm while February barely receives 11 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)West Bay climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 29 | 31 | 31 | 32 | 32 | 32 | 32 | 31 | 30 | 29 |
| Avg temp (°C) | 26 | 26 | 26 | 27 | 28 | 29 | 29 | 29 | 29 | 28 | 27 | 26 |
| Avg low (°C) | 23 | 22 | 23 | 24 | 25 | 26 | 26 | 26 | 25 | 25 | 24 | 23 |
| Precipitation (mm) | 25 | 11 | 14 | 27 | 84 | 131 | 110 | 89 | 120 | 196 | 121 | 52 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 29 | 29 | 31 | 31 | 32 |
| Avg temp (°C) | 26 | 26 | 26 | 27 | 28 | 29 |
| Avg low (°C) | 23 | 22 | 23 | 24 | 25 | 26 |
| Precipitation (mm) | 25 | 11 | 14 | 27 | 84 | 131 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 32 | 32 | 31 | 30 | 29 |
| Avg temp (°C) | 29 | 29 | 29 | 28 | 27 | 26 |
| Avg low (°C) | 26 | 26 | 25 | 25 | 24 | 23 |
| Precipitation (mm) | 110 | 89 | 120 | 196 | 121 | 52 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 3 | 3 | 3 | 7 | 8 | 8 | 10 | 11 | 13 | 9 | 6 |
| Days with high ≥ 32°C (days) | — | — | — | 0.8 | 4 | 12 | 19 | 20 | 18 | 8 | 1 | 0.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 3 | 3 | 3 | 7 | 8 |
| Days with high ≥ 32°C (days) | — | — | — | 0.8 | 4 | 12 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 8 | 10 | 11 | 13 | 9 | 6 |
| Days with high ≥ 32°C (days) | 19 | 20 | 18 | 8 | 1 | 0.0 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 36 | 34 | 34 | 48 | 60 | 54 | 55 | 60 | 59 | 53 | 47 |
| Relative humidity (%) | 77 | 77 | 76 | 77 | 79 | 81 | 79 | 78 | 78 | 79 | 78 | 78 |
| Wind speed (m/s) | 5.9 | 5.6 | 5.4 | 4.8 | 4.8 | 4.9 | 4.7 | 4.4 | 4.2 | 5.0 | 6.0 | 6.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 36 | 34 | 34 | 48 | 60 |
| Relative humidity (%) | 77 | 77 | 76 | 77 | 79 | 81 |
| Wind speed (m/s) | 5.9 | 5.6 | 5.4 | 4.8 | 4.8 | 4.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 54 | 55 | 60 | 59 | 53 | 47 |
| Relative humidity (%) | 79 | 78 | 78 | 79 | 78 | 78 |
| Wind speed (m/s) | 4.7 | 4.4 | 4.2 | 5.0 | 6.0 | 6.0 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Roberts, a weather station, about 10 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.