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

July 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
Julio, the same as Junio, in Charleston, South Carolina, is another tropical summer month, with average temperature fluctuating between 91°F (32.8°C) and 73°F (22.8°C).

Temperature

The warmest month is Julio, with an average high-temperature of 91°F (32.8°C) and an average low-temperature of 73°F (22.8°C).

Heat index

The average heat index is calculated to a blazing hot 114.3°F (45.7°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 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, pregnancy, metabolic differences, and differences in body mass, height, and shape affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity in Julio is 76.6%.

Rainfall

In Charleston, in Julio, it is raining for 13 days, with typically 6.53" (165.9mm) of accumulated precipitation. In Charleston, during the entire year, the rain falls for 112.7 days and collects up to 51.03" (1296.1mm) of precipitation.

Snowfall

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

Ocean temperature

In Charleston, the average water temperature is 82.9°F (28.3°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 Julio, the average length of the day in Charleston is 14.1h.

Sunshine

In Julio, the average sunshine is 9.3h.

UV index

Months with the highest UV index 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 risk from unsafe exposure to the UV radiation for average individuals.
Note: In Julio, the average maximum UV index of 10 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the warmest month in Charleston?

With an average high-temperature of 91°F (32.8°C) and an average low-temperature of 73°F (22.8°C), Julio is the warmest month in Charleston, South Carolina.

What is the temperature in Julio in Charleston?

In Charleston, South Carolina, in Julio, the average high-temperature is 91°F (32.8°C), and the average low-temperature is 73°F (22.8°C). In Julio, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that factores the actual air temperature with the relative humidity, is estimated at 114.3°F (45.7°C).

What is the average humidity in Julio in Charleston?

In Charleston, the average relative humidity in Julio is 76.6%.

How many days does it rain in Julio in Charleston?

In Charleston, in Julio, it is raining for 13 days, with typically 6.53" (165.9mm) of accumulated precipitation.

When it does not snow in Charleston?

Enero, Marzo through Noviembre are months without snowfall in Charleston.

How warm is the water in Julio in Charleston?

In Julio, the average ocean temperature in Charleston, South Carolina, is 82.9°F (28.3°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

How many hours of daylight does Charleston have in Julio?

In Charleston, South Carolina, the average length of the day in Julio is 14.1h.

How long on average sun shines in Julio in Charleston?

The average sunshine in Julio in Charleston, South Carolina, is 9.3h.

When is the highest UV index in Charleston?

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

What is the UV index reading in Julio in Charleston?

The average daily maximum UV index in Julio in Charleston is 10. A UV Index estimate of 8 to 10 represents a very high hazard to health from the exposure to the Sun's UV rays.
Average temperature in July - Charleston, SC
  • Average high temperature in July: 91.1°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 July: 73°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 July - Charleston, SC
  • Average humidity in July: 76.6%

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 July - Charleston, SC
  • Average rainfall in July: 6.5"

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 July - Charleston, SC
  • Average rainfall days in July: 13 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 July - Charleston, SC
  • Average snowfall in July: 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 July - Charleston, SC
  • Average snowfall days in July: 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 July - Charleston, SC
  • Average sea temperature in July: 83°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 July / Average sunshine in July - Charleston, SC
  • Average daylight in July: 14.1h

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 July: 9.3h

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 July - Charleston, SC
  • Average UV index in July: 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).