May weather forecastPort Royal, SC
May
Weather in May
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
May's arrival brings a modest temperature shift, moving from 74.7°F (23.7°C) in April to a still warm 81.1°F (27.3°C). An average low-temperature of 66.9°F (19.4°C) is observed during May nights.Heat index
In May, the average heat index is appraised at a hot 86°F (30°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', gives a temperature feeling by integrating air temperature and humidity. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. 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 are particularly important for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
Humidity
The average relative humidity in May in Port Royal is 74%.Rainfall
In Port Royal, South Carolina, in May, it is raining for 14.1 days, with typically 1.81" (46mm) of accumulated precipitation. In Port Royal, during the entire year, the rain falls for 154.7 days and collects up to 23.11" (587mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
In Port Royal, the average length of the day in May 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
The average sunshine in May 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 health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum high daily UV index of 7 during May translates into the following directions:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Port Royal, SC
- Average high temperature in May: 81.1°F
The warmest month (with the highest average high temperature) is July (89.6°F).
The month with the lowest average high temperature is January (57.6°F).
- Average low temperature in May: 66.9°F
The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (44.1°F).
Average pressure in May
Port Royal, SC
- Average pressure in May: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.98"Hg).
Average wind speed in May
Port Royal, SC
- Average wind speed in May: 7.6mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in May
Port Royal, SC
- Average humidity in May: 74%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (71%).
Average rainfall in May
Port Royal, SC
- Average rainfall in May: 1.81"
The wettest month (with the highest rainfall) is August (3.54").
The driest month (with the least rainfall) is February (0.87").
Average rainfall days in May
Port Royal, SC
- Average rainfall days in May: 14.1 days
The month with the highest number of rainy days is August (21.8 days).
The month with the least rainy days is November (6.8 days).
Average snowfall days in May
Port Royal, SC
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (0.2 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in May /
Average sunshine in May
Port Royal, SC
- Average daylight in May: 13h and 48min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in May: 10h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in May
Port Royal, SC
- Average sunshine days in May: 14.8 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is August (5.3 days).
Average UV index in May
Port Royal, SC
- Average UV index in May: 7
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).
Average cloud cover in May
Port Royal, SC
- Average cloud cover in May: 28
The months with the most cloud cover are February and December (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in May
Port Royal, SC
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
