September weather forecast
Vega Baja, PR

September beckons the arrival of fall in Vega Baja. The transition to autumn causes a slight dip in temperature, slipping to 85.5°F (29.7°C) as the highest and 78.3°F (25.7°C) as the lowest. Wind speed drops further to 7.4mph (11.9km/h). September ushers in a gradual decrease in daylight hours, marking the onset of shorter days and longer nights. As the month ends, temperatures continue their downward trend, preparing for the cooler months ahead.

Temperature

The shift into September in Vega Baja uncovers an average high-temperature of a still warm 85.5°F (29.7°C), subtly different from the previous month. Night temperatures during September in Vega Baja experience a slight downturn, averaging a still moderately hot 78.3°F (25.7°C).

Heat index

Throughout September, the heat index is estimated at a torrid 96.8°F (36°C). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. Exposing to direct sunshine may enhance heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', comes about by integrating the temperature readings with the humidity levels. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

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

Rainfall

In Vega Baja, in September, it is raining for 19.5 days, with typically 3.94" (100mm) of accumulated precipitation. Throughout the year, there are 213.7 rainfall days, and 28.66" (728mm) of precipitation is accumulated.

Daylight

The average length of the day in September in Vega Baja, Puerto Rico, is 12h and 14min.
On the first day of September in Vega Baja, sunrise is at 6:11 am and sunset at 6:39 pm. On the last day of the month, sunrise is at 6:15 am and sunset at 6:14 pm AST.

Sunshine

In Vega Baja, Puerto Rico, the average sunshine in September is 9.4h.

UV index

The months with the highest UV index in Vega Baja are April through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun.