May weather forecast
Castleton, Jamaica

May, the last month of the spring in Castleton, is a hot month, with an average temperature varying between 30.3°C (86.5°F) and 22.5°C (72.5°F).

Temperature

The advent of May denotes an average high-temperature of a hot 30.3°C (86.5°F), subtly different from April's 29.9°C (85.8°F). May nights are marked by an average temperature drop to an agreeable 22.5°C (72.5°F).

Heat index

For most parts of May, the heat index is computed to be a fiery hot 38°C (100.4°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

In Castleton, in May, during 25.4 rainfall days, 94mm (3.7") of precipitation is typically accumulated. Throughout the year, there are 265.1 rainfall days, and 806mm (31.73") of precipitation is accumulated.

Daylight

The average length of the day in May is 12h and 59min.
On the first day of May, sunrise is at 05:39 and sunset at 18:28. On the last day of the month, sunrise is at 05:30 and sunset at 18:39 EST.

Sunshine

In Castleton, the average sunshine in May is 10.4h.

UV index

May through August and October, with an average maximum UV index of 7, are months with the highest UV index in Castleton. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 7 during May translates into the following recommendations:
Resist overexposure. Safeguarding from solar damage is indispensable. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.