September weather forecast
Guánica, PR

As the year moves towards the end, September brings the highest rainfall measures of the year, rendering it the wettest month. The lush vegetation coupled with warm sea temperatures makes the beaches incredibly alluring. Evenings in Guánica are similarly appealing with an average low temperature of 76.5°F (24.7°C), paving the way for comfortable nights. Meanwhile, the higher cloud frequency adds to the aesthetic allure of the city’s landscapes, creating picturesque vistas that stay etched in visitors' memories. Despite the high rainfall days, tourism continues to thrive, drawn in by the incredibly diverse ecosystems and vibrant local culture on display.

Temperature

September in Guánica is marked by an average high-temperature of a still tropical 86.2°F (30.1°C), almost identical to the preceding month. In September, the temperature in Guánica drops to an average of 76.5°F (24.7°C) at night.

Heat index

The average heat index in September is evaluated at a sweltering 98.6°F (37°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Note that heat index values are valued for light wind and location in the shade. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

In September, the average relative humidity in Guánica is 78%.

Rainfall

September is the month with the most rainfall in Guánica. Rain falls for 20.9 days and accumulates 3.58" (91mm) of precipitation.

Snowfall

The only month with snowfall is September. September has the most snowfall days of the year. Snow falls for 0.1 days.

Ocean temperature

The month with the warmest seawater in Guánica, Puerto Rico, is September, with an average ocean temperature of 84.9°F (29.4°C).
Note: For any water activity, surface water temperatures from 77°F (25°C) to 84.2°F (29°C) are deemed perfect and extremely pleasing for enduring enjoyment.

Daylight

In September, the average length of the day is 12h and 14min.
On the first day of September, sunrise is at 6:13 am and sunset at 6:41 pm. On the last day of the month, sunrise is at 6:17 am and sunset at 6:16 pm AST.

Sunshine

In September, the average sunshine is 9.4h.

UV index

The months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.