September weather forecast
Puerto Rico, Bolivia

September, the first month of the spring in Puerto Rico, is a torrid month, with temperature in the range of an average low of 23.1°C (73.6°F) and an average high of 35.5°C (95.9°F).

Temperature

With an average high-temperature of 35.5°C (95.9°F) and an average low-temperature of 23.1°C (73.6°F), September is the warmest month.

Heat index

During September, the heat index is computed to be a blazing hot 46°C (114.8°F). Take heed: Heat exhaustion and heat cramps are anticipated. Heatstroke is a potential outcome of continuous activity.
Observations indicate that the heat index values are for shady locations with light wind. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', evaluates the perceived heat by adding the effect of moisture in the air. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Puerto Rico, the average relative humidity in September is 58%.

Rainfall

In Puerto Rico, Bolivia, during September, the rain falls for 11.5 days and regularly aggregates up to 32mm (1.26") of precipitation. In Puerto Rico, during the entire year, the rain falls for 233.4 days and collects up to 1251mm (49.25") of precipitation.

Daylight

In September, the average length of the day is 12h and 3min.
On the first day of September, sunrise is at 06:32 and sunset at 18:27. On the last day of the month, sunrise is at 06:14 and sunset at 18:25 -04.

Sunshine

In Puerto Rico, the average sunshine in September is 9.2h.

UV index

The months with the highest UV index in Puerto Rico are July through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 7 translates into these guidelines:
Ward off overexposure. Defence against solar harm is crucial. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.