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Weather in Grand Cayman - 14-day forecast

Detailed weather forecast for Grand Cayman, Cayman Islands: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Grand Cayman
today🌧️ 30°💧 1.9 mm
Sun🌧️ 30°💧 0.3 mm
Mon🌤️ 30°💧 0.2 mm
Tue🌧️ 30°💧 0.3 mm
Wed🌧️ 30°💧 5.2 mm
Thu🌧️ 30°💧 4.4 mm
Fri🌧️ 30°💧 0.9 mm
Sat🌤️ 30°💧 0.8 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Tuesday 8 Sept in Grand Cayman, the forecast high is 30°C. Typical daytime temperatures at this time of year range from 29°C to 30°C, so it will be warmer than usual. It is warmer than 78% of similar days.

30°Cnear normal
usually 29°C–30°C
night: exceptionally warm rain: typical rainfall wind: lighter than usual
30°Cnear normal
usually 29°C–30°C
night: warmer than usual rain: exceptionally dry wind: lighter than usual
30°Cwarmer than usual
usually 29°C–30°C
warmer than 73% of similar days
night: exceptionally warm rain: exceptionally dry wind: stronger than usual
30°Cwarmer than usual
usually 29°C–30°C
warmer than 78% of similar days
night: exceptionally warm rain: exceptionally dry wind: exceptionally strong
30°Cnear normal
usually 29°C–30°C
night: exceptionally warm rain: more rain than usual wind: typical
30°Cnear normal
usually 29°C–30°C
night: exceptionally warm rain: more rain than usual wind: typical
30°Cnear normal
usually 29°C–30°C
night: warmer than usual rain: less rain than usual wind: exceptionally light

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
25°30°35° 1981: 29°C1982: 29°C1983: 29°C1984: 28°C1985: 29°C1986: 29°C1987: 29°C1988: 29°C1989: 30°C1990: 29°C1991: 29°C1992: 29°C1993: 29°C1994: 29°C1995: 30°C1996: 29°C1997: 29°C1998: 30°C1999: 29°C2000: 29°C2001: 29°C2002: 30°C2003: 29°C2004: 30°C2005: 30°C2006: 30°C2007: 29°C2008: 30°C2009: 30°C2010: 30°C2011: 30°C2012: 29°C2013: 29°C2014: 29°C2015: 30°C2016: 30°C2017: 30°C2018: 29°C2019: 30°C2020: 30°C2021: 30°C2022: 30°C2023: 31°C2024: 31°C2025: 31°C 2026 forecast: 30°C current forecast 30°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 30°C by day. The coolest year was 1984 (28°C) and the warmest was 2024 (31°C). The current forecast averages 30°C - higher than in 69% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Grand Cayman

Grand Cayman - 14-day weather forecast infographic

Grand Cayman 30 & 45-day weather - long-range outlook

Next 15 days · forecast
29°
around 29° at night · days with rain: 9
Weeks 3-4 · avg for September
32°
around 26° at night · rain chance 42%
Weeks 5-7 · avg for October
31°
around 26° at night · rain chance 41%
The 30 & 45-day outlook for Grand Cayman: the next 15 days are a numerical forecast updated daily - on average 29° by day and 29° at night. Further out we rely on multi-year climate averages: around 32° in September, and about 31° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Grand Cayman

Saturday5 September 2026
🌧️30°light rain
sunrise 06:11 · sunset 18:37 · night 29° · evening 30° · rain 1.88 mm · humidity 73% · wind 4 m/s · clouds 52%
Sunday6 September 2026
🌧️30°light rain
sunrise 06:11 · sunset 18:36 · night 29° · evening 30° · rain 0.27 mm · humidity 74% · wind 5 m/s · clouds 95%
Monday7 September 2026
🌤️30°a few clouds
sunrise 06:11 · sunset 18:35 · night 30° · evening 30° · rain 0.18 mm · humidity 74% · wind 7 m/s · clouds 19%
Tuesday8 September 2026
🌧️30°light rain
sunrise 06:11 · sunset 18:34 · night 30° · evening 30° · rain 0.27 mm · humidity 80% · wind 8 m/s · clouds 82%
Wednesday9 September 2026
🌧️30°light rain
sunrise 06:11 · sunset 18:33 · night 30° · evening 30° · rain 5.24 mm · humidity 74% · wind 6 m/s · clouds 73%
Thursday10 September 2026
🌧️30°light rain
sunrise 06:12 · sunset 18:32 · night 29° · evening 29° · rain 4.44 mm · humidity 71% · wind 6 m/s · clouds 100%
Friday11 September 2026
🌧️30°light rain
sunrise 06:12 · sunset 18:31 · night 29° · evening 29° · rain 0.87 mm · humidity 71% · wind 4 m/s · clouds 25%
Saturday12 September 2026
🌤️30°a few clouds
sunrise 06:12 · sunset 18:30 · night 30° · evening 30° · rain 0.78 mm · humidity 72% · wind 5 m/s · clouds 14%
Sunday13 September 2026
🌧️30°light rain
sunrise 06:12 · sunset 18:29 · night 30° · evening 30° · rain 0.33 mm · humidity 74% · wind 8 m/s · clouds 84%
Monday14 September 2026
🌧️30°moderate rain
sunrise 06:12 · sunset 18:29 · night 29° · evening 29° · rain 8.4 mm · humidity 74% · wind 11 m/s · clouds 84%
Tuesday15 September 2026
🌧️30°light rain
sunrise 06:12 · sunset 18:28 · night 29° · evening 30° · rain 5.49 mm · humidity 73% · wind 8 m/s · clouds 80%
Wednesday16 September 2026
🌧️29°moderate rain
sunrise 06:13 · sunset 18:27 · night 28° · evening 27° · rain 26.58 mm · humidity 77% · wind 9 m/s · clouds 85%
Thursday17 September 2026
🌧️29°moderate rain
sunrise 06:13 · sunset 18:26 · night 29° · evening 29° · rain 18.06 mm · humidity 78% · wind 9 m/s · clouds 99%
Friday18 September 2026
🌧️29°moderate rain
sunrise 06:13 · sunset 18:25 · night 28° · evening 27° · rain 23.52 mm · humidity 79% · wind 9 m/s · clouds 100%
Saturday19 September 2026
🌧️28°heavy rain
sunrise 06:13 · sunset 18:24 · night 30° · evening 29° · rain 45.51 mm · humidity 84% · wind 8 m/s · clouds 100%

UV index in Grand Cayman - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTGrand Cayman03681111+8.8UV VERY HIGHtoday, daily maxSPF 50, long sleeves and shade between 10:00 and16:00.Unprotected fair skin may burn in about 25 min9Sat5.099Sun6.099Mon7.098Tue8.098Wed9.097Thu10.099Fri11.099Sat12.099Sun13.099Mon14.099Tue15.098Wed16.099Thu17.098Fri18.098Sat19.098Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in Grand Cayman is 9 (very high) - unprotected fair skin can burn in about 25 minutes. SPF 50, long sleeves and shade between 10:00 and 16:00.

Sea temperature - Grand Cayman

Water today
31°C
Week avg
31°C
Waves today
0.7 m
How's the water?
very warm
16-day sea temperature forecast:
5.09 31°C6.09 31°C7.09 31°C8.09 31°C9.09 31°C10.09 31°C11.09 31°C12.09 31°C13.09 31°C
Average sea temperature through the year:
Jan 28°CFeb 27°CMar 28°CApr 28°CMay 29°CJun 30°CJul 30°CAug 31°CSep 31°COct 31°CNov 29°CDec 28°C
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Grand Cayman weather through the year

Grand Cayman - annual climate

Warmest, driest months on average: January, February, March, December.

Nearby and related places

CienfuegosSancti SpíritusMontego BaySanta ClaraCiego de ÁvilaCamagüeyMandevilleHoniaraDakhlaKingstownBridgetownMajuroBissau

FAQ - Grand Cayman weather

What is the weather like in Grand Cayman today?
Today it is about 30° during the day and 29° at night, light rain.
How far ahead can I check the forecast for Grand Cayman?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.