August weather forecastJohns Island, SC
August
Weather in August
The last month of the summer, August, is also a hot month in Johns Island, South Carolina, with an average temperature varying between 76.3°F (24.6°C) and 88.3°F (31.3°C).Temperature
August reports an average high-temperature of a still hot 88.3°F (31.3°C), slightly varied from July's 89.6°F (32°C). The mean low-temperature during August nights in Johns Island, South Carolina, is a warm 76.3°F (24.6°C).Heat index
The average heat index in August is appraised at a blisteringly hot 104°F (40°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.It is crucial to understand that heat index figures are for shade and gentle wind conditions. When exposed to the direct sun, the heat index may augment by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an estimation of the warmth sensation when considering humidity levels. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.
Humidity
In August, the average relative humidity in Johns Island is 76%.Rainfall
August is the month with the most rainfall. Rain falls for 22.7 days and accumulates 4.29" (109mm) of precipitation.Snowfall
March through November are months without snowfall.Daylight
In August, the average length of the day in Johns Island is 13h and 19min.On the first day of the month, sunrise is at 6:34 am and sunset at 8:18 pm. On the last day of August, sunrise is at 6:54 am and sunset at 7:45 pm EDT.
Sunshine
The average sunshine in August in Johns Island is 10.7h.UV index
May through August, with an average maximum UV index of 7, are months with the highest UV index in Johns Island. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 7 during August leads to these instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Johns Island, SC
- Average high temperature in August: 88.3°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 (56.8°F).
- Average low temperature in August: 76.3°F
The month with the highest average low temperature is July (76.5°F).
The coldest month (with the lowest average low temperature) is January (42.8°F).
Average pressure in August
Johns Island, SC
- Average pressure in August: 29.99"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in August
Johns Island, SC
- Average wind speed in August: 6.5mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in August
Johns Island, SC
- Average humidity in August: 76%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is March (72%).
Average rainfall in August
Johns Island, SC
- Average rainfall in August: 4.29"
The wettest month (with the highest rainfall) is August (4.29").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in August
Johns Island, SC
- Average rainfall days in August: 22.7 days
The month with the highest number of rainy days is August (22.7 days).
The month with the least rainy days is November (6.9 days).
Average snowfall days in August
Johns Island, SC
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is December (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in August /
Average sunshine in August
Johns Island, SC
- Average daylight in August: 13h and 18min
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 August: 10h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in August
Johns Island, SC
- Average sunshine days in August: 6.1 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (6.1 days).
Average UV index in August
Johns Island, SC
- Average UV index in August: 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 August
Johns Island, SC
- Average cloud cover in August: 29
The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are June and July (Cloud cover 26).
Average visibility in August
Johns Island, SC
- Average visibility in August: 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).
