Grand Cayman in September
In September, Grand Cayman averages 31°C (87°F) during the day and 27°C (81°F) at night, with frequent rain — about 28 days of the month see precipitation (104 mm total).
Off-peakConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
It's peak hurricane season in Grand Cayman during September. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How September compares to the rest of the year in Grand Cayman
September is one of the warmest months in Grand Cayman (3rd of 12) and moderately rainy compared to the rest of the year (4th of 12). Daytime temperature runs 1°C above the annual average (29°C). September runs roughly the same as August (31°C) and cools 1°C in October (30°C).
September sunrise & sunset in Grand Cayman
Times shown for Grand Cayman local time (America/Cayman), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Grand Cayman — September
Golden-hour and blue-hour windows for the 15th of September, in Grand Cayman's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Grand Cayman in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Off-peak) and Grand Cayman's popularity.
Crowds & pricing — September in Grand Cayman
This is off-peak for Grand Cayman — the lowest prices of the year and the fewest crowds, but with real trade-offs: some restaurants, hotels, and beach businesses may close for the season; weather conditions can make outdoor activities unpredictable; and a handful of seasonal sights run reduced hours or close entirely. Great if you prefer a quiet local rhythm and don't mind the climate giving you reasons to choose indoor activities.
Why this tier: peak hazard season (1 active)
Sun & mosquito risk — September in Grand Cayman
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Grand Cayman — September
Across the year Grand Cayman's sea swings from 26.9°C (February) to 30.6°C (August) — September sits at 30.6°C.
Grand Cayman in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 27°C / 81°F | 25°C / 76°F | 41 mm | 24 | — |
| February | 27°C / 81°F | 25°C / 76°F | 37 mm | 23 | — |
| March | 28°C / 82°F | 25°C / 76°F | 50 mm | 24 | — |
| April | 29°C / 84°F | 25°C / 78°F | 48 mm | 24 | — |
| May | 29°C / 85°F | 26°C / 78°F | 120 mm | 29 | — |
| June | 30°C / 86°F | 27°C / 80°F | 120 mm | 26 | — |
| July | 31°C / 87°F | 27°C / 81°F | 54 mm | 29 | — |
| August | 31°C / 88°F | 27°C / 81°F | 100 mm | 28 | — |
| September | 31°C / 87°F | 27°C / 81°F | 104 mm | 28 | — |
| October | 30°C / 85°F | 26°C / 80°F | 155 mm | 28 | — |
| November | 29°C / 83°F | 26°C / 78°F | 104 mm | 26 | — |
| December | 28°C / 82°F | 25°C / 78°F | 51 mm | 23 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Grand Cayman in September →
Frequently asked questions
How hot is Grand Cayman in September?
In September, Grand Cayman averages a high of 31°C (87°F) and a low of 27°C (81°F) — generally hot.
Does it rain a lot in Grand Cayman in September?
September is quite rainy in Grand Cayman, with about 28 rainy days on average.
Is September a good time to visit Grand Cayman?
September is hot but on the rainy side. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Grand Cayman in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full September packing list for Grand Cayman for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.