May weather forecast
Juana Díaz, PR

The month of May in Puerto Rico, USA, is characterized by a mild uptick in temperatures and increased rainfall. At 2.95 in, rainfall reaches its peak for the first half of the year, which contributes to the enhanced lushness of the landscape. With more sunlight hours compared to April, outdoor activities continue to be popular among residents and visitors alike. Sea temperatures also rise, luring beach enthusiasts to the country's palm-fringed shores. Heading into June, expect humid conditions to persist but with slightly reduced rainfall.

Temperature

Juana Díaz sees the arrival of May with an average high-temperature of a still warm 84.4°F (29.1°C), indicating a subtle variation from April. Juana Díaz, during May nights, observes an average temperature of 74.1°F (23.4°C).

Heat index

The heat index value for May is computed to be a very hot 95°F (35°C). Take more caution, heat exhaustion and heat cramps may occur. Long-lasting activity may cause heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', evaluates the perceived heat by adding the effect of moisture in the air. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. An increase in relative humidity hinders the body's normal cooling function by reducing evaporation, thereby decreasing the rate of body cooling and enhancing the sense of warmth. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Juana Díaz, the average relative humidity in May is 79%.

Rainfall

In Juana Díaz, in May, it is raining for 24.6 days, with typically 2.95" (75mm) of accumulated precipitation. In Juana Díaz, during the entire year, the rain falls for 249.1 days and collects up to 28.82" (732mm) of precipitation.

Ocean temperature

In Juana Díaz, in May, the average water temperature is 82°F (27.8°C).
Note: Water temperatures from 77°F (25°C) to 84.2°F (29°C) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

In Juana Díaz, the average length of the day in May is 12h and 59min.
On the first day of May in Juana Díaz, sunrise is at 5:58 am and sunset at 6:47 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 6:58 pm AST.

Sunshine

In Juana Díaz, the average sunshine in May is 10.4h.

UV index

May 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 health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: A daily maximum UV index of 7 in May translates into the following instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Stay vigilant! UV rays get a boost in intensity due to sand and water reflections.