September weather forecast
George Town, Cayman Islands

In September, the average high temperature remains at 30°C (86°F) while the overall climate begins to prepare for the cooler months. A significant rainfall of 180mm (7.09"), the highest throughout the year, may lead to frequent rain showers. The sea temperature starts to cool, yet continues to lure aromarine aficionados. Daylight hours decline to 12.2, marking a shift towards shorter days. While the UV index scales down slightly, sun-protection measures are still vital.

Temperature

The yearly peak temperatures occur in June through September, averaging a high-temperature of 30°C (86°F).

Rainfall

In George Town, Cayman Islands, in September, it is raining for 9 days, with typically 180mm (7.09") of accumulated precipitation. Throughout the year, there are 80 rainfall days, and 1282mm (50.47") of precipitation is accumulated.

Sea temperature

August and September, with an average sea temperature of 29.9°C (85.8°F), are months with the warmest seawater.
Note: Temperatures between 25°C (77°F) and 29°C (84.2°F) in water are ideal for swimming, diving, and other activities, providing enjoyment and comfort for extended durations.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 06:10 and sunset at 18:40. On the last day of September, in George Town, sunrise is at 06:16 and sunset at 18:14 EST.

Sunshine

In September, the average sunshine in George Town is 8h.

UV index

In George Town, Cayman Islands, the average daily maximum UV index in September is 11. A UV Index of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 11 translates into the following recommendations:
Enforce every vital precaution. Those with light skin could endure burns in a matter of minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. One must apply and reapply generously an SPF 30+ broad-spectrum sunscreen every two hours or after an outdoor workout or swim. Note! Reflective surfaces like sand and water heighten the UV radiation levels.