September weather forecast
Barceloneta, PR

September in Barceloneta marks the beginning of the transition towards the end of the year, with minor decreases in temperature. Notably, the sea temperature remains high, perfect for a late-summer dip. The most significant change comes in the form of rainfall, where the city experiences the second-highest amount of 3.94" (100mm). Despite the continuation of the wet season, the magnificent charm of Barceloneta remains undeterred.

Temperature

Barceloneta, Puerto Rico, observes a minor difference in average high-temperatures between August's 85.6°F (29.8°C) and September's 85.5°F (29.7°C). Barceloneta registers a gentle descent to an average nighttime low of 78.3°F (25.7°C) in September from its daytime highs.

Heat index

Throughout September, the heat index is evaluated at a very hot 96.8°F (36°C). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', ties air temperature with relative humidity to produce the perceived temperature sensation. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. 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 are of high significance for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Barceloneta, the average relative humidity in September is 78%.

Rainfall

In Barceloneta, 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.

Ocean temperature

With an average ocean temperature of 84.9°F (29.4°C), September is the month with the warmest seawater.
Note: With water temperature from 77°F (25°C) to 84.2°F (29°C), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.

Daylight

In Barceloneta, the average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 6:11 am and sunset at 6:40 pm. On the last day of September, sunrise is at 6:16 am and sunset at 6:15 pm AST.

Sunshine

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 of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, a regular UV index of 7 translates into these guidelines:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Caution! Sand and water reflections can notably increase the UV radiation intensity.