September weather forecast
Vega Alta, PR

In Vega Alta, September experiences a slight cooling down from the peak temperatures of August but remains notably hotter than the following October. This month witnesses the highest rainfall in inches signifying the onset of the wet season. With the decrease in daylight hours, the days start becoming shorter. Yet, the sunshine hours increase marginally, hinting at clearer skies. Wind conditions in September moderate further, with gusts measuring only 10.9mph (17.5km/h) on average.

Temperature

September denotes a minimal variation in the average high-temperature to a still warm 85.1°F (29.5°C) from August's 85.5°F (29.7°C). September records a small disparity from daytime temperatures, marking an average low-temperature of 78.4°F (25.8°C).

Heat index

In September, the heat index is estimated at a fiery hot 96.8°F (36°C). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In September, the average relative humidity is 78%.

Rainfall

In Vega Alta, in September, it is raining for 20.4 days, with typically 3.62" (92mm) of accumulated precipitation. In Vega Alta, during the entire year, the rain falls for 223.5 days and collects up to 27.95" (710mm) of precipitation.

Daylight

In September, the average length of the day in Vega Alta is 12h and 14min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:39 pm. On the last day of September, sunrise is at 6:15 am and sunset at 6:14 pm AST.

Sunshine

In September, the average sunshine in Vega Alta is 9.4h.

UV index

The months with the highest UV index in Vega Alta are May through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 7 during September translates into the following recommendations:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.