September weather forecast
Juana Díaz, PR

September witnesses the conclusion of summer in Puerto Rico, USA. The coastal town is bathed by occasional heavy rains with an average of 4.45 in, the highest throughout the year. The climate grows more dynamic with noticeable fluctuations in the evenings making them cooler and more enjoyable. Despite an uptick in showers, sunlight hours stay generous, casting a beautiful light over the island's landscapes. Moving into October, expect a continuation of benevolent weather with a slight decrease in rainfall.

Temperature

Juana Díaz commences September with an average high-temperature of a moderately hot 85.8°F (29.9°C), maintaining a close resemblance to the previous month. Throughout September, Juana Díaz's nights cool down to an average of 75.7°F (24.3°C).

Heat index

For September, the heat index is computed to be a fiery hot 98.6°F (37°C). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
In reference to the heat index, it's for places in shade and with a slight wind. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

In September, the average relative humidity in Juana Díaz is 80%.

Rainfall

September is the month with the most rainfall. Rain falls for 22.7 days and accumulates 4.45" (113mm) of precipitation.

Ocean temperature

September is the month with the warmest seawater, with an average ocean temperature of 85.3°F (29.6°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In Juana Díaz, the average length of the day in September is 12h and 14min.
On the first day of September, sunrise is at 6:11 am and sunset at 6:39 pm. On the last day of the month, sunrise is at 6:16 am and sunset at 6:15 pm AST.

Sunshine

In Juana Díaz, the average sunshine in September is 9.2h.

UV index

May through October, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.