May weather forecast
Luquillo, PR

Luquillo's weather in May is characteristic of the tropical climate experienced in Puerto Rico. May is marked by a jump in the average temperature scale setting the stage for the imminent summer months. The sun shines longer as daylight hours increase to 13 hours. Interestingly, this month sees a significant rise in average rainfall to 1.69" (43mm), the first substantial increase since the start of the year. Despite the heat, frequent rains and moderate winds of 10.4mph (16.7km/h) make the weather enjoyable, typical of a tropical paradise.

Temperature

The shift from April to May in Luquillo, Puerto Rico, is characterized by an average high-temperature of a still warm 81.5°F (27.5°C), not significantly different from the 80.4°F (26.9°C) of April. Luquillo's nocturnal May readings average at a still warm 78.4°F (25.8°C), showing little variation from the daytime temperatures.

Heat index

During May, the heat index is estimated at a hot 87.8°F (31°C). With unrelenting exposure and activity, one might experience exhaustion, leading to potential heat cramps.
Observations indicate that the heat index values are for shady locations with light wind. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', quantifies the warmth felt when relative humidity is considered. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.

Humidity

May through August, with an average relative humidity of 79%, are the most humid months in Luquillo, Puerto Rico.

Rainfall

In Luquillo, during May, the rain falls for 19.8 days and regularly aggregates up to 1.69" (43mm) of precipitation. Throughout the year, there are 216 rainfall days, and 21.5" (546mm) of precipitation is accumulated.

Daylight

In May, the average length of the day in Luquillo is 13h and 0min.
On the first day of May, sunrise is at 5:55 am and sunset at 6:44 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 6:55 pm AST.

Sunshine

In Luquillo, the average sunshine in May is 10.3h.

UV index

January, March through December, 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 vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 in May interprets into the following advice:
Guard against overexposure. Protection from sun-induced harm is essential. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.