May weather forecast
Guayanilla, PR

In Guayanilla, May is the harbinger of a tropical weather shift. This transition is marked by a gradual progression from the mild conditions observed in April to a more distinctive warm and moist climate typical of island living. Alongside this fundamental shift, the city experiences its highest rainfall of the year, a substantial 2.05" (52mm). The increase in rainfall engenders a breathtaking lushness, wherein everything appears verdant and thriving. It's a time of lively beach days, fresh island produce, and a vibrancy that pervades every corner of Guayanilla.

Temperature

The advent of May brings an average high-temperature of a still moderately hot 84.7°F (29.3°C), exhibiting minor difference from the previous month. Guayanilla, in the month of May, anticipates a consistent average low-temperature of 74.7°F (23.7°C).

Heat index

During May, the heat index is computed to be a very hot 95°F (35°C). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular 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.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. When heat uptake goes beyond the body's cooling mechanisms, there's a surge in body temperature, posing health risks.

Humidity

The average relative humidity in May in Guayanilla is 77%.

Rainfall

In Guayanilla, during May, the rain falls for 21.6 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 224.9 rainfall days, and 23.58" (599mm) of precipitation is accumulated.

Snowfall

In Guayanilla, snow does not fall in January through August, October through December.

Daylight

In Guayanilla, the average length of the day in May is 12h and 59min.
On the first day of May, sunrise is at 5:59 am and sunset at 6:48 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 6:59 pm AST.

Sunshine

The average sunshine in May in Guayanilla is 10.7h.

UV index

The months with the highest UV index are April through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In May, the maximum 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 emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Enhance your sun protection with tightly woven, yet airy clothing.