September weather forecast
Kingston, Jamaica

September’s weather features an increase in both rainfall and relative humidity in Kingston. Given the increased rainfall at 114mm (4.49"), September is characterized by frequent, albeit short-lived showers. Despite the increased rainfall, the day temperatures remain consistently high. The trend of intensive rainfall carries over into October, highlighting its monsoon-like period.

Temperature

September is marked by an average high-temperature of a still tropical 32.1°C (89.8°F), almost identical to the preceding month. Kingston throughout September, experiences an average nighttime temperature of 24°C (75.2°F).

Heat index

Throughout September, the heat index is evaluated at a scorching 43°C (109.4°F). Precaution: Heat cramps along with heat exhaustion are possible. Heatstroke is a serious risk with continued exertion.
Note that heat index values are valued for light wind and location in the shade. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'real feel' or 'feels like', is a metric representing the sensation of warmth when air temperature and moisture come together. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

In Kingston, the average relative humidity in September is 77%.

Rainfall

In Kingston, during September, the rain falls for 11 days and regularly aggregates up to 114mm (4.49") of precipitation. In Kingston, during the entire year, the rain falls for 93 days and collects up to 813mm (32.01") of precipitation.

Sea temperature

The month with the warmest seawater is September, with an average sea temperature of 29.5°C (85.1°F).
Note: For activities in the water such as swimming or diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal for prolonged enjoyment without discomfort.

Daylight

In September, the average length of the day in Kingston is 12h and 14min.
On the first day of the month, sunrise is at 05:53 and sunset at 18:20. On the last day of September, sunrise is at 05:57 and sunset at 17:56 EST.

Sunshine

With an average of 7.1h of sunshine, September has the least sunshine of the year.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index in Kingston. A UV Index value of 11, and more, symbolizes an extreme threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 12 during September leads to these advisories:
Execute all crucial precautions. Warding off sun exposure is non-negotiable. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Apply generously and frequently reapply a sunscreen with SPF 30 or more even on cloudy days, particularly after a swim or outdoor exercise. Alert! UV radiation becomes sharper due to reflections from sand and water.