September weather forecast
New Kingston, Jamaica

September holds slightly different weather traits compared to August. The rainfall takes a significant jump, reaching 154mm (6.06") and tying with May for the maximum rainfall recorded during the year. Despite this, a steady dip in wind speed is noted, making days warmer than the breezy earlier months. As the days get shorter, the warmth tends to linger, promising a warm start to the final quarter of the year.

Temperature

The arrival of September brings an average high-temperature of a still hot 30.1°C (86.2°F), closely following the temperature pattern of August. In the month of September, New Kingston's average low-temperature falls to a moderately hot 24.1°C (75.4°F).

Heat index

In September, the heat index is estimated at a sweltering 38°C (100.4°F). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In September, the average relative humidity is 81%.

Rainfall

In New Kingston, in September, during 27.1 rainfall days, 154mm (6.06") of precipitation is typically accumulated. Throughout the year, in New Kingston, there are 310.9 rainfall days, and 1286mm (50.63") of precipitation is accumulated.

Sea temperature

With an average sea temperature of 29.8°C (85.6°F), September is the month with the warmest seawater in New Kingston.
Note: Swimming, diving, and other water activities in temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are highly enjoyable and provide prolonged comfort without unease.

Daylight

In New Kingston, the average length of the day in September is 12h and 14min.
On the first day of September, sunrise is at 05:52 and sunset at 18:20. On the last day of the month, sunrise is at 05:57 and sunset at 17:56 EST.

Sunshine

August and September, with an average of 10.8h of sunshine, are months with the most sunshine in New Kingston.

UV index

June through October, with an average maximum UV index of 7, are months with the highest UV index in New Kingston. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 7 in September translates into this advice:
Resist overexposure. Safeguarding from solar damage is indispensable. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Take note! The UV strength of the Sun elevates when reflected off water and sand.