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

The average high-temperature in Juana Díaz, Puerto Rico, during September registers at a warm 85.8°F (29.9°C), closely corresponding to the preceding month. In Juana Díaz, September's nights observe an average temperature dip to a still moderately hot 75.7°F (24.3°C).

Heat index

September's average heat index is estimated at a torrid 98.6°F (37°C). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', takes into account both air temperature and humidity to illustrate what people actually feel. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Youngsters frequently overlook the need for breaks and fluid intake. Thirst is an advanced sign of dehydration - thereby highlighting the importance of keeping hydrated, particularly during long physical activities.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

In September, the average relative humidity is 80%.

Rainfall

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

Ocean temperature

September is the month with the warmest seawater in Juana Díaz, with an average ocean temperature of 85.3°F (29.6°C).
Note: For swimming, diving, or other water activities, the temperature range of 77°F (25°C) to 84.2°F (29°C) is perceived as exceptionally enjoyable and comfortable even for prolonged periods.

Daylight

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

Sunshine

In September, the average sunshine is 9.2h.

UV index

May through October, with an average maximum UV index of 7, are months with the highest UV index in Juana Díaz, Puerto Rico. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The UV index of 7 in September translates into these instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Stay cautious! Sand and water reflections increase UV radiation potency.