Charleston
South Carolina, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Charleston, SC

Trees along both sides of a street in Charleston, South Carolina, in the twilight light
Trees along both sides of a street in Charleston, South Carolina, in the twilight light
The last month of the summer, Agosto, is another tropical month in Charleston, South Carolina, with average temperature varying between 89.4°F (31.9°C) and 72.3°F (22.4°C).

Temperature

In Agosto, the average high-temperature is essentially the same as in Julio - a still hot 89.4°F (31.9°C). In Charleston, the average low-temperature is 72.3°F (22.4°C).

Heat index

The average heat index is estimated at a scorching 110.3°F (43.5°C). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'real feel', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like clothing, wind, differences in body mass, height, and shape, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

Agosto is the most humid month, with an average relative humidity of 78.9%.

Rainfall

Agosto is the month with the most rainfall in Charleston. Rain falls for 13.2 days and accumulates 7.15" (181.6mm) of precipitation.

Snowfall

In Charleston snow does not fall in Enero, Marzo through Noviembre.

Ocean temperature

Agosto is the month with the warmest seawater, with an average ocean temperature of 83.5°F (28.6°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Agosto, the average length of the day in Charleston is 13.3h.

Sunshine

In Charleston, the average sunshine is 8.3h.

UV index

Months with the highest UV index in Charleston are Junio through Agosto, with an average maximum UV index of 10. A UV Index estimate of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 10 in Agosto transform into the following instructions:
Take special precautions, as unprotected skin can be damaged and can burn quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in Agosto in Charleston?

The average high-temperature, in Agosto, is 89.4°F (31.9°C), while the average low-temperature is 72.3°F (22.4°C). In Agosto, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is calculated to 110.3°F (43.5°C).

What is the most humid month in Charleston?

The most humid month is Agosto, with an average relative humidity of 78.9%.

What is the average humidity in Agosto in Charleston?

The average relative humidity in Agosto in Charleston, South Carolina, is 78.9%.

How much does it rain in Charleston in Agosto?

In Charleston, South Carolina, during Agosto, the rain falls for 13.2 days and regularly aggregates up to 7.15" (181.6mm) of precipitation.

What is the rainiest month in Charleston?

The month with the most rainfall in Charleston, South Carolina, is Agosto when the rain falls for 13.2 days and typically aggregates up to 7.15" (181.6mm) of precipitation.

When it does not snow in Charleston?

In Charleston snow does not fall in Enero, Marzo through Noviembre.

What month is the ocean warmest in Charleston?

The month with the warmest seawater in Charleston is Agosto, with an average ocean temperature of 83.5°F (28.6°C).

What is the water temperature in Agosto in Charleston?

In Charleston, South Carolina, in Agosto, the average water temperature is 83.5°F (28.6°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Charleston have in Agosto?

In Charleston, the average length of the day in Agosto is 13.3h.

How many hours of sunshine does Charleston have in Agosto?

In Charleston, the average sunshine in Agosto is 8.3h.

What are the months with the highest UV index in Charleston?

Junio through Agosto, with an average maximum UV index of 10, are months with the highest UV index in Charleston.

What is the UV index reading in Agosto in Charleston?

In Agosto, the average daily maximum UV index in Charleston is 10. A UV Index reading of 8 to 10 represents a very high health risk from unprotected exposure to the UV radiation.
Average temperature in August - Charleston, SC
  • Average high temperature in August: 89.5°F

The warmest month (with the highest average high temperature) is July (91.1°F).
The month with the lowest average high temperature is January (59°F).

  • Average low temperature in August: 72.3°F

The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (37.5°F).

Average humidity in August - Charleston, SC
  • Average humidity in August: 78.9%

The month with the highest relative humidity is August (78.9%).
The month with the lowest relative humidity is February (67.4%).

Average rainfall in August - Charleston, SC
  • Average rainfall in August: 7.2"

The wettest month (with the highest rainfall) is August (7.2").
The driest month (with the lowest rainfall) is November (2.4").

Average rainfall days in August - Charleston, SC
  • Average rainfall days in August: 13.2 days

The month with the highest number of rainy days is August (13.2 days).
The month with the lowest number of rainy days is November (7 days).

Average snowfall in August - Charleston, SC
  • Average snowfall in August: 0"

The month with the highest snowfall is December (0.5").
Months with the lowest snowfall are January, March, April, May, June, July, August, September, October and November (0").

Average snowfall days in August - Charleston, SC
  • Average snowfall days in August: 0 days

Months with the highest number of snowfall days are February and December (0.2 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average sea temperature in August - Charleston, SC
  • Average sea temperature in August: 83.5°F

The best month for swimming (with the highest average sea temperature) is August (83.5°F).
The coldest month (with the lowest average sea temperature) is February (61.9°F).

Average daylight in August / Average sunshine in August - Charleston, SC
  • Average daylight in August: 13.3h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in August: 8.3h

The month with most sunshine is May (Average sunshine: 9.5h).
The month with least sunshine is December (Average sunshine: 5.5h).

Average UV index in August - Charleston, SC
  • Average UV index in August: 10

Months with the highest UV index are June, July and August (UV index 10).
Months with the lowest UV index are January and December (UV index 3).