Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
A slight uplift of average high-temperatures is noted in May, with temperatures adjusting from a warm 75.2°F (24°C) in April to a still moderately hot 81.9°F (27.7°C). In Harleyville, an average low-temperature of 63.3°F (17.4°C) is recorded during May nights.Heat index
In May, the heat index is calculated to be a tropical 87.8°F (31°C). Continuous activity in exposure could lead to a feeling of fatigue and heat cramps.Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', gives a temperature feeling by integrating air temperature and humidity. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Humidity
May, August, September and December, with an average relative humidity of 77%, are the most humid months.Rainfall
In May, in Harleyville, the rain falls for 14.8 days. Throughout May, 1.97" (50mm) of precipitation is accumulated. In Harleyville, during the entire year, the rain falls for 151.2 days and collects up to 23.46" (596mm) of precipitation.Snowfall
March through December are months without snowfall.Daylight
The average length of the day in May in Harleyville is 13h and 53min.On the first day of May in Harleyville, sunrise is at 6:33 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 6:13 am and sunset at 8:25 pm EDT.
Sunshine
In Harleyville, South Carolina, the average sunshine in May is 10h.UV index
The average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: During May, 6 as the daily maximum UV index converts into the following advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Harleyville in May?
What is the most humid month in Harleyville?
What is the average humidity in May in Harleyville?
How many days does it rain in May in Harleyville?
When it does not snow in Harleyville?
How many hours of daylight does Harleyville have in May?
When is the sunrise / sunset in May in Harleyville?
How many hours of sunshine does Harleyville have in May?
What is the UV index reading in May in Harleyville?
Average temperature in May
Harleyville, SC
- Average high temperature in May: 81.9°F
The warmest month (with the highest average high temperature) is July (91.2°F).
The month with the lowest average high temperature is January (55.2°F).
- Average low temperature in May: 63.3°F
The month with the highest average low temperature is July (73.2°F).
The coldest month (with the lowest average low temperature) is January (38.8°F).
Average pressure in May
Harleyville, SC
- Average pressure in May: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in May
Harleyville, SC
- Average wind speed in May: 6.2mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in May
Harleyville, SC
- Average humidity in May: 77%
The months with the highest relative humidity are May, August, September and December (77%).
The month with the lowest relative humidity is January (72%).
Average rainfall in May
Harleyville, SC
- Average rainfall in May: 1.97"
The wettest month (with the highest rainfall) is August (3.15").
The driest month (with the least rainfall) is November (0.91").
Average rainfall days in May
Harleyville, SC
- Average rainfall days in May: 14.8 days
The month with the highest number of rainy days is August (19.5 days).
The month with the least rainy days is November (6.8 days).
Average snowfall in May
Harleyville, SC
- Average snowfall in May: 0"
The months with the highest snowfall are January and February (0.16").
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in May
Harleyville, SC
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in May /
Average sunshine in May
Harleyville, SC
- Average daylight in May: 13h and 5min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in May: 10h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in May
Harleyville, SC
- Average sunshine days in May: 14.3 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is August (8.7 days).
Average UV index in May
Harleyville, SC
- Average UV index in May: 6
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in May
Harleyville, SC
- Average cloud cover in May: 35
The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in May
Harleyville, SC
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Harleyville, South Carolina, USA
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