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

September denotes a minimal variation in the average high-temperature to a still warm 85.5°F (29.7°C) from August's 85.6°F (29.8°C). A modest decline from daytime high temperatures is noticed in September, marking the average low at a still moderately hot 78.3°F (25.7°C).

Heat index

During September, the heat index is calculated to be a very hot 96.8°F (36°C). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. 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 'real feel' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
One of the main methods the human body employs to cool down is by perspiring, as this process allows sweat to evaporate and remove excess heat. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Overheating and potential dehydration arise when body heat gain eclipses its release capability.

Humidity

In September, the average relative humidity is 78%.

Rainfall

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

Daylight

In Vega Baja, the average length of the day in September is 12h and 14min.
On the first day of September, 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, the average sunshine in September is 9.4h.

UV index

April through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: A daily high UV index of 7 in September leads to these guidelines:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. To cut down UV radiation exposure by about half, sport a wide-brim hat.