May weather forecast
Port Royal, SC

May sees the weather in Port Royal gradually transitioning towards summer, with a significant increase in temperatures compared to April. This month brings locals and tourists outside to enjoy the warm weather, now characterized by comfortable temperatures between 66.9°F (19.4°C) and 81.1°F (27.3°C). Meanwhile, humidity levels stand steady at 74%, making the weather feel slightly warmer than it is. The city experiences rainfall on 14.1 days on average in May, making it the start of the city's rainier seasons. All of these conditions combined make May an ideal time for visiting Port Royal to appreciate the city's natural beauty in its summertime glory.

Temperature

The arrival of May in Port Royal witnesses a small shift in the average high-temperature, moving from 74.7°F (23.7°C) in April to a still warm 81.1°F (27.3°C). May nights cool down to an average low-temperature of 66.9°F (19.4°C).

Heat index

The heat index value during May is estimated at a tropical 86°F (30°C). Enduring exposure and ongoing activity could cause a sense of fatigue and subsequent heat cramps.
Observations indicate that the heat index values are for shady locations with light wind. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.

Humidity

In Port Royal, South Carolina, the average relative humidity in May is 74%.

Rainfall

In Port Royal, South Carolina, in May, during 14.1 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Port Royal, during the entire year, the rain falls for 154.7 days and collects up to 23.11" (587mm) of precipitation.

Snowfall

In Port Royal, snow does not fall in March through November.

Daylight

The average length of the day in May in Port Royal is 13h and 50min.
On the first day of the month, sunrise is at 6:35 am and sunset at 8:04 pm. On the last day of May, sunrise is at 6:16 am and sunset at 8:24 pm EDT.

Sunshine

In May, the average sunshine is 10.5h.

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In May, an average UV index of 7 transforms into the following instructions:
Deflect overexposure. Sun protection is a necessity. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.