September weather forecast
Punta Santiago, PR

By September, the weather in Punta Santiago begins to cool down slightly, heralding the slow transition towards the fall season. The overall temperature displays a marginal decrease and rainfall begins to drop. A decrease in wind speed is also noticeable. However, despite the weather changes, humidity remains consistent with the summer months. Even though temperatures remain high at 84.6°F (29.2°C), the sea temperatures begin to cool down, somewhat moderating the weather, and rainfall decreases to 4.33" (110mm) over approximately 24.5 days.

Temperature

The unfolding of September shows an average high-temperature of a still warm 84.6°F (29.2°C), indicating a slight variance from August's 84.7°F (29.3°C). Punta Santiago navigates through September with a barely noticeable decrease in temperature at night, stabilizing at a still warm 78.6°F (25.9°C).

Heat index

The heat index in September is estimated at a sweltering 95°F (35°C). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
In the scope of the heat index, its values resonate with shade and light wind conditions. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'real feel', represents the fusion of temperature and moisture in the air to suggest how warm it feels. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

The average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 24.5 days. Throughout September, 4.33" (110mm) of precipitation is accumulated. Throughout the year, there are 268.8 rainfall days, and 38.58" (980mm) of precipitation is accumulated.

Ocean temperature

The month with the warmest seawater is September, with an average ocean temperature of 84.9°F (29.4°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 September, the average length of the day is 12h and 14min.
On the first day of September in Punta Santiago, sunrise is at 6:08 am and sunset at 6:36 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 6:12 pm AST.

Sunshine

In September, the average sunshine is 9.1h.

UV index

April through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In September, the UV index of 7 transforms into the following advice:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Take heed! Reflections of sand and water make the Sun's UV rays stronger.