Weather in Grandcayman - 14-day forecast

Detailed weather forecast for Grandcayman, Cayman Islands: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Grandcayman

today🌧️ 29°💧 1 mm

Thu🌧️ 29°💧 8 mm

Fri🌧️ 29°💧 5.3 mm

Sat🌧️ 29°💧 1.9 mm

Sun🌧️ 29°💧 1.8 mm

Mon🌧️ 29°💧 1.2 mm

Tue🌧️ 29°💧 1.8 mm

Wed🌧️ 29°💧 13.1 mm

14-day forecast - Grandcayman

📅 Grandcayman 30 & 45-day weather - long-range outlook

Next 15 days · forecast

29°

around 29° at night · days with rain: 11

Weeks 3-4 · avg for July

32°

around 26° at night · rain chance 35%

Weeks 5-7 · avg for August

32°

around 26° at night · rain chance 39%

The 30 & 45-day outlook for Grandcayman: 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 July, and about 32° in August. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Grandcayman

Wednesday8 July 2026

🌧️29°light rain

sunrise 05:53 · sunset 19:07 · night 29° · evening 29° · rain 0.96 mm · humidity 77% · wind 6 m/s · clouds 30%

Thursday9 July 2026

🌧️29°moderate rain

sunrise 05:53 · sunset 19:07 · night 29° · evening 29° · rain 7.97 mm · humidity 77% · wind 8 m/s · clouds 42%

Friday10 July 2026

🌧️29°moderate rain

sunrise 05:53 · sunset 19:07 · night 29° · evening 29° · rain 5.28 mm · humidity 78% · wind 9 m/s · clouds 32%

Saturday11 July 2026

🌧️29°light rain

sunrise 05:54 · sunset 19:07 · night 29° · evening 29° · rain 1.86 mm · humidity 79% · wind 10 m/s · clouds 65%

Sunday12 July 2026

🌧️29°light rain

sunrise 05:54 · sunset 19:07 · night 29° · evening 29° · rain 1.82 mm · humidity 76% · wind 7 m/s · clouds 43%

Monday13 July 2026

🌧️29°light rain

sunrise 05:54 · sunset 19:07 · night 29° · evening 29° · rain 1.17 mm · humidity 78% · wind 6 m/s · clouds 13%

Tuesday14 July 2026

🌧️29°light rain

sunrise 05:55 · sunset 19:07 · night 29° · evening 29° · rain 1.8 mm · humidity 76% · wind 6 m/s · clouds 15%

Wednesday15 July 2026

🌧️29°moderate rain

sunrise 05:55 · sunset 19:06 · night 29° · evening 29° · rain 13.05 mm · humidity 76% · wind 9 m/s · clouds 100%

Thursday16 July 2026

🌧️29°light rain

sunrise 05:56 · sunset 19:06 · night 29° · evening 29° · rain 0.27 mm · humidity 78% · wind 10 m/s · clouds 88%

Friday17 July 2026

🌧️29°light rain

sunrise 05:56 · sunset 19:06 · night 29° · evening 29° · rain 1.05 mm · humidity 77% · wind 7 m/s · clouds 63%

Saturday18 July 2026

🌤️29°a few clouds

sunrise 05:56 · sunset 19:06 · night 29° · evening 29° · rain 5.34 mm · humidity 69% · wind 5 m/s · clouds 19%

Sunday19 July 2026

☀️28°clear sky

sunrise 05:57 · sunset 19:06 · night 29° · evening 29° · rain 1.11 mm · humidity 69% · wind 3 m/s · clouds 21%

Monday20 July 2026

☀️29°clear sky

sunrise 05:57 · sunset 19:05 · night 29° · evening 29° · rain 2.01 mm · humidity 74% · wind 6 m/s · clouds 9%

Tuesday21 July 2026

☀️29°clear sky

sunrise 05:57 · sunset 19:05 · night 29° · evening 29° · rain 0.15 mm · humidity 70% · wind 7 m/s · clouds 5%

Wednesday22 July 2026

☁️29°broken clouds

sunrise 05:58 · sunset 19:05 · night 29° · evening 29° · humidity 72% · wind 6 m/s · clouds 60%

☀️ UV index in Grandcayman - is it safe to sunbathe?

Today the UV index in Grandcayman is 9 (very high) - unprotected fair skin can burn in about 20 minutes. SPF 50, long sleeves and shade between 10:00 and 16:00.

🌊 Sea temperature - Grandcayman

Water today

30°C

Week avg

30°C

Waves today

1.3 m

How's the water?

very warm

16-day sea temperature forecast:

8.07 30°C9.07 30°C10.07 30°C11.07 30°C12.07 30°C13.07 30°C14.07 30°C15.07 29°C16.07 29°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.

Grandcayman weather through the year

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

Nearby places

CienfuegosSancti SpíritusMontego BaySanta ClaraCiego de ÁvilaCamagüeyMandeville

FAQ - Grandcayman weather

What is the weather like in Grandcayman today?

Today it is about 29° during the day and 29° at night, light rain.

How far ahead can I check the forecast for Grandcayman?

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.