September weather forecastAdjuntas, PR

Weather in September

September in Adjuntas is marked by a decline in temperatures, with the high temperature falling to 86.2°F (30.1°C). Despite this, the environmental conditions remain pleasant for outdoor activities, thanks to the 12.2 daylight hours. The month stands out for its elevated rainfall level at 3.58" (91mm) - the highest for the year. The relative humidity also sees a rise to 78%, reflective of increased precipitation. Wind speed takes a slight hit, receding to a gentle 6.2mph (10km/h).

Temperature

The transition into September is marked with an average high-temperature of a still tropical 86.2°F (30.1°C), showing an insignificant shift from August's 86.5°F (30.3°C). An average nighttime temperature of 76.5°F (24.7°C) is witnessed throughout September.

Heat index

September's mean heat index is appraised at a very hot 98.6°F (37°C). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The average relative humidity in September is 78%.

Rainfall

September is the month with the most rainfall in Adjuntas. Rain falls for 20.9 days and accumulates 3.58" (91mm) of precipitation.

Snowfall

The only month with snowfall in Adjuntas, Puerto Rico, is September. The month with the most snowfall days in Adjuntas is September, when snow falls for 0.1 days.

Daylight

In September, the average length of the day is 12h and 14min.
On the first day of the month, sunrise is at 6:12 am and sunset at 6:40 pm. On the last day of September, sunrise is at 6:17 am and sunset at 6:16 pm AST.

Sunshine

The average sunshine in September is 9.4h.

UV index

April through October, 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 threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 7 during September leads to these instructions:
Fend off overexposure. Sun protection is vital. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.