October weather forecast
Arroyo, PR

October represents the transition into the cooler season in Arroyo, with temperatures starting to fall slightly from September's highs. Although rainfall remains substantial at 3.62" (92mm), the month witnesses a softer touch of the sun. The steady wind contributes to the city's climatic balance during this month. The considerably cooler evenings are an ideal time for night walks by the shore under the starlit skies. Despite the temperature drop, the sea remains warm enough for visitors and locals to enjoy water activities.

Temperature

As Arroyo welcomes October, the average high-temperature stabilizes at a still moderately hot 84°F (28.9°C), showing little deviation from September's 85.1°F (29.5°C). A mean low-temperature of 75.9°F (24.4°C) is a distinguishing feature of October, indicating a slight dip from daytime highs.

Heat index

October's mean heat index is evaluated at a sweltering 95°F (35°C). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
When assessing, remember that heat index measurements are for light winds and shaded spots. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', quantifies the warmth felt when relative humidity is considered. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Should you be directly under the sun, anticipate a possible increase in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In Arroyo, the average relative humidity in October is 81%.

Rainfall

In Arroyo, in October, during 25.3 rainfall days, 3.62" (92mm) of precipitation is typically accumulated. Throughout the year, there are 255.3 rainfall days, and 29.41" (747mm) of precipitation is accumulated.

Ocean temperature

In Arroyo, the average seawater temperature in October is 84.7°F (29.3°C).
Note: In any water activity, temperatures between 77°F (25°C) and 84.2°F (29°C) are viewed as magnificent and exceptionally pleasant for prolonged enjoyment.

Daylight

In October, the average length of the day is 11h and 44min.
On the first day of the month, sunrise is at 6:14 am and sunset at 6:12 pm. On the last day of October, sunrise is at 6:23 am and sunset at 5:52 pm AST.

Sunshine

The average sunshine in October is 7.9h.

UV index

The months with the highest UV index are May through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In October, a daily maximum UV index of 7 leads to the following instructions:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.