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 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 ushers in an average high-temperature of a still hot 86.2°F (30.1°C), aligning closely with the preceding month. Guánica observes an average nighttime temperature of 76.5°F (24.7°C) during September.

Heat index

For September, the heat index is calculated to be a torrid 98.6°F (37°C). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for 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.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

The average relative humidity in September is 78%.

Rainfall

The month with the most rainfall is September, when the rain falls for 20.9 days and typically aggregates up to 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 is September, with an average ocean temperature of 84.9°F (29.4°C).
Note: Between 77°F (25°C) and 84.2°F (29°C), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.

Daylight

In Guánica, the average length of the day in September 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

The average sunshine in September 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 of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, a regular UV index of 7 translates into these guidelines:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. 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. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Take note! UV radiation from the Sun can double in intensity due to snow reflection.