West Bay climate — normals and trends
West Bay has a tropical savanna climate, averaging 26.6 °C annually with 964 mm of rain per year.
Climate normals · ERA5
West BayWest Bay
- coords
- 19.38°, -81.39°
- period
- 1940–2025 · 86 yrs
The normals for this period
The average of every indicator across the whole window: temperature, water, sky, wind and notable days.
Mean daily temperature
26.6°C
Average daily high
27.2°C
Average daily low
25.8°C
Annual rainfall
964mm
Sunshine / day
11.2h
Mean relative humidity
79%
Average peak wind
27.1km/h
Seasonal range
3.1°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
149 d/yr
Annual snowfall
0.0 cm
Average feels-like high
30.5 °C
Average feels-like low
27.5 °C
Average peak gust
37.3 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
What the yearly averages say about warming here, and whether the slope is statistically solid.
+0.8 °C
since 1940
+0.1 °C per decade · r² = 0.46 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
Climate month by month
How an average year unfolds: when it rains, when it turns hot, when the sun is out.
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
The most extreme days ever measured here, then the year-by-year detail.
Hottest day
30.9 °C
5 August 2023
Coldest day
18.6 °C
13 January 1981
Wettest day
277 mm
12 September 2004
Windiest day
140.1 km/h
12 September 2004
Strongest gust
205.6 km/h
12 September 2004
Hottest feels-like
39.0 °C
11 September 2024
Coldest feels-like
13.4 °C
10 January 1970
Sunniest day
13.0 h
5 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and compare it with the normal: warmer, drier, more extreme?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 26.5 °C | +0.8 °C | 12 mm | -21 mm |
| Feb | 26.7 °C | +1.1 °C | 13 mm | -10 mm |
| Mar | 26.9 °C | +1.0 °C | 9 mm | -9 mm |
| Apr | 27.0 °C | +0.4 °C | 30 mm | +9 mm |
| May | 28.5 °C | +1.1 °C | 12 mm | -78 mm |
| Jun | 29.0 °C | +0.9 °C | 75 mm | -43 mm |
| Jul | 29.5 °C | +0.9 °C | 25 mm | -45 mm |
| Aug | 30.0 °C | +1.2 °C | 32 mm | -63 mm |
| Sep | 29.9 °C | +1.3 °C | 59 mm | -86 mm |
| Oct | 29.0 °C | +1.0 °C | 147 mm | -46 mm |
| Nov | 27.8 °C | +0.7 °C | 82 mm | -31 mm |
| Dec | 27.3 °C | +1.0 °C | 25 mm | -24 mm |
The year's extremes
What was the weather like that day?
The weather actually measured on a given date, anywhere in the covered window.
Climate at a glance
What these normals say about the place, in a few sentences, and the notions needed to read them.
West Bay (Cayman Islands) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.6 °C and it receives 964 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (28.1 °C on average) and the coldest is January (25.0 °C). Rainfall peaks in October.
West Bay averages 0 frost days, 2 hot days (≥ 30 °C) and 149 rainy days per year.
West Bay has warmed by +0.8 °C between 1940 and 2025, or +0.09 °C per decade. This trend is statistically significant.
The hottest day of the period reached 30.9 °C (on 5 August 2023) and the coldest 18.6 °C (on 13 January 1981).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Compare West Bay with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around West Bay
Other cities — Cayman Islands
Frequently asked questions
What is the climate of West Bay?
West Bay has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.6 °C and it receives 964 mm of precipitation per year.
What is the hottest day ever recorded in West Bay?
The hottest day measured in West Bay between 1940 and 2025 was 5 August 2023, reaching 30.9 °C.
What is the coldest day in West Bay?
The coldest day measured in West Bay between 1940 and 2025 was 13 January 1981, at 18.6 °C.
Does it snow in West Bay?
Almost never: West Bay sees virtually no snow, with about 0 frost days per year.
Has the climate of West Bay warmed?
Yes: West Bay warmed by +0.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in West Bay?
The wettest day measured in West Bay between 1940 and 2025 was 12 September 2004, with 277 mm of rain in 24 hours.
What was the windiest day in West Bay?
The windiest day measured in West Bay between 1940 and 2025 was 12 September 2004, with winds reaching 140.1 km/h.
What is the warmest month in West Bay?
The warmest month in West Bay is August (28.1 °C on average); the coldest is January (25.0 °C).
How much does it rain in West Bay?
West Bay receives on average 964 mm of precipitation per year, spread over about 149 rainy days.
Is it sunny in West Bay?
West Bay gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
Are there tropical nights in West Bay?
Yes: West Bay has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in West Bay?
In West Bay, between 1940 and 2025, the highest apparent temperature reached 39.0 °C on 11 September 2024, and the lowest was 13.4 °C on 10 January 1970.
These forecasts and records come from our own weather API. Developer documentation →