September weather forecast
Toa Alta, PR

September in Toa Alta signals the onset of the transition period from the hot to the cooler months. The temperature decline is gradual and moderate, bringing slight relief from the summer's peak heat. Changes in wind speed are also noticeable, indicating the upcoming shift in the season. The quantum of rainfall is high, accounting for a greener and fresher environment. The noteworthy climatic event of September is the considerable rainfall, recorded at a substantial 3.62" (92mm), indicating the wet season presence.

Temperature

Toa Alta experiences an average high-temperature of a still moderately hot 85.1°F (29.5°C) with the onset of September, subtly varied from August's 85.5°F (29.7°C). During the nights of September, Toa Alta maintains an almost steady temperature with an average low of 78.4°F (25.8°C).

Heat index

The average heat index in September is appraised at a torrid 96.8°F (36°C). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. Exposure to the direct sun could elevate the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. A person's impression of weather can be affected by numerous aspects, among them metabolic variations, pregnancy, and activity levels. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Evaporating sweat is a key way the human body dispels excessive warmth, all thanks to the process of perspiration. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

The average relative humidity in September is 78%.

Rainfall

In Toa Alta, Puerto Rico, in September, it is raining for 20.4 days, with typically 3.62" (92mm) of accumulated precipitation. Throughout the year, there are 223.5 rainfall days, and 27.95" (710mm) of precipitation is accumulated.

Daylight

In Toa Alta, the average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 6:10 am and sunset at 6:38 pm. On the last day of September, sunrise is at 6:15 am and sunset at 6:14 pm AST.

Sunshine

The average sunshine in September is 9.4h.

UV index

May through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: An average UV index of 7 in September transforms into this advice:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.