September weather forecast
Vega Baja, PR

September, the first month of the autumn in Vega Baja, is also a moderately hot month, with an average temperature fluctuating between 85.5°F (29.7°C) and 78.3°F (25.7°C).

Temperature

In September, the average high-temperature is essentially the same as in August - a still moderately hot 85.5°F (29.7°C). In Vega Baja, Puerto Rico, in September, the average low-temperature is 78.3°F (25.7°C).

Heat index

The average heat index in September is evaluated at a very hot 96.8°F (36°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, wind, differences in body mass, height, and shape), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

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

Rainfall

In Vega Baja, during September, the rain falls for 19.5 days and regularly aggregates up to 3.94" (100mm) of precipitation. In Vega Baja, Puerto Rico, during the entire year, the rain falls for 213.7 days and collects up to 28.66" (728mm) of precipitation.

Daylight

In September, the average length of the day in Vega Baja is 12h and 14min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:40 pm. On the last day of September, in Vega Baja, sunrise is at 6:15 am and sunset at 6:15 pm AST.

Sunshine

The average sunshine in September is 9.4h.

UV index

The months with the highest UV index are April through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.