September weather forecast
Port Antonio, Jamaica

Entering into September, Port Antonio experiences significant weather transformations. Temperature variations are minimal, but rainfall begins to increase. The month endorses less sunshine hours and reduced daylight. Despite the shorter days, enjoyment of the sea can continue due to high sea temperatures. The UV index drops to a 12, but sun protection still remains crucial.

Temperature

September's average high-temperature in Port Antonio, Jamaica, stands at a still tropical 30°C (86°F), showing little deviation from August's 31°C (87.8°F). In Port Antonio, the nighttime temperature averages to a pleasant 22°C (71.6°F) during September.

Rainfall

In Port Antonio, Jamaica, during September, the rain falls for 14 days and regularly aggregates up to 220mm (8.66") of precipitation. Throughout the year, in Port Antonio, there are 125 rainfall days, and 2639mm (103.9") of precipitation is accumulated.

Sea temperature

September is the month with the warmest seawater, with an average sea temperature of 29.8°C (85.6°F).
Note: Surface water temperatures falling between 25°C (77°F) and 29°C (84.2°F) are regarded as prime and extremely agreeable for enduring periods during any water activity.

Daylight

In September, the average length of the day in Port Antonio is 12h and 14min.
On the first day of the month, sunrise is at 05:51 and sunset at 18:19. On the last day of September, sunrise is at 05:56 and sunset at 17:54 EST.

Sunshine

September through November, with an average of 6h of sunshine, are months with the least sunshine in Port Antonio.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an excessive health risk from exposure to the Sun's UV rays for the ordinary person.
Note: An average UV index of 12 in September transforms into this advice:
Utilize all necessary safety measures, unprotected skin could suffer burns instantly. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Frequent reapplication of a broad-spectrum SPF 30+ sunscreen is vital every two hours or directly after a swim or an outdoor workout. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.