July weather forecast
Charleston, SC

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Trees along both sides of a street in Charleston, South Carolina
Trees along both sides of a street in Charleston, South Carolina

Weather in July

July in Charleston, South Carolina, is a tropical summer month, with temperature in the range of an average high of 88.2°F (31.2°C) and an average low of 77.4°F (25.2°C).

Temperature

July is the warmest month, with an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 77.4°F (25.2°C).

Heat index

In July, the average heat index is computed to be a very hot 103.6°F (39.8°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With 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 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, metabolic differences, pregnancy, and clothing affect individual temperature impact. 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. Excessive warmth is eliminated from the body by evaporation of sweat. 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 surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In July, the average relative humidity in Charleston is 75%.

Rainfall

In Charleston, South Carolina, during July, the rain falls for 23.3 days and regularly aggregates up to 4.72" (120mm) of precipitation. In Charleston, during the entire year, the rain falls for 178.9 days and collects up to 41.93" (1065mm) of precipitation.

Snowfall

February through November are months without snowfall in Charleston, South Carolina.

Ocean temperature

In Charleston, the average seawater temperature in July is 82.9°F (28.3°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The average length of the day in July is 14h and 4min.
On the first day of July in Charleston, South Carolina, sunrise is at 6:15 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:33 am and sunset at 8:19 pm EDT.

Sunshine

With an average of 11h of sunshine, July has the most sunshine of the year.

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 7 in July transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the warmest month in Charleston?

July is the warmest month in Charleston, with an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 77.4°F (25.2°C).

What is the temperature in July in Charleston?

In Charleston, in July, the average high-temperature is 88.2°F (31.2°C), and the average low-temperature is 77.4°F (25.2°C). In July, the average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, is computed to be 103.6°F (39.8°C).

What is the average humidity in July in Charleston?

In July, the average relative humidity is 75%.

How much does it rain in Charleston in July?

In Charleston, South Carolina, during July, the rain falls for 23.3 days and regularly aggregates up to 4.72" (120mm) of precipitation.

When it does not snow in Charleston?

In Charleston, snow does not fall in February through November.

What is the water temperature in July in Charleston?

In July, 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 July?

The average day length in July in Charleston is 14h and 4min.

When is the sunrise / sunset in July in Charleston?

In July, on the first day of the month, sunrise is at 6:15 am and sunset at 8:31 pm. On the last day of the month, in Charleston, sunrise is at 6:33 am and sunset at 8:19 pm EDT.

What month has the most sunshine in Charleston?

July has the most sunshine of the year in Charleston, South Carolina, with an average of 11h of sunshine.

How many hours of sunshine does Charleston have in July?

The average sunshine duration in July is 11h.

When is the highest UV index in Charleston?

May through August, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index reading in July in Charleston?

In July, the average daily maximum UV index in Charleston is 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJulyASOND
Jun
July
Aug
Average high temperature
85.8°F 29.9°C
88.2°F 31.2°C
87.4°F 30.8°C
Average low temperature
74.7°F 23.7°C
77.4°F 25.2°C
76.8°F 24.9°C
Average pressure
29.98" 761mmHg
30" 762mmHg
29.99" 762mmHg
Average wind speed
8mph 12.9km/h
8.1mph 13km/h
7.5mph 12.1km/h
Average max. wind speed
8.6mph 13.8km/h
8.8mph 14.2km/h
8mph 12.9km/h
Average wind speed gusts
12.3mph 19.8km/h
12.3mph 19.8km/h
11.4mph 18.3km/h
Average humidity
75%
75%
76%
Average rainfall
4.45" 113mm
4.72" 120mm
7.13" 181mm
Average rainfall days
20.5
23.3
24.8
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
79.3°F 26.3°C
83°F 28.3°C
83.5°F 28.6°C
Average daylight
14h 17min
14h 4min
13h 19min
Average sunshine
10h 48min
11h 0min
10h 48min
Average sunshine days
6.7
5.7
3.8
Average UV index
7
7
7
Average cloud cover
26%
26%
28%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in July
Charleston, SC

Average temperature in July - Charleston, SC
  • Average high temperature in July: 88.2°F

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (57°F).

  • Average low temperature in July: 77.4°F

The month with the highest average low temperature is July (77.4°F).
The coldest month (with the lowest average low temperature) is January (44.4°F).

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Average pressure in July
Charleston, SC

Average pressure in July - Charleston, SC
  • Average pressure in July: 30"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).

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Average wind speed in July
Charleston, SC

Average wind speed in July - Charleston, SC
  • Average wind speed in July: 8.1mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is August (7.5mph).

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Average humidity in July
Charleston, SC

Average humidity in July - Charleston, SC
  • Average humidity in July: 75%

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are January and March (73%).

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Average rainfall in July
Charleston, SC

Average rainfall in July - Charleston, SC
  • Average rainfall in July: 4.72"

The wettest month (with the highest rainfall) is August (7.13").
The driest month (with the least rainfall) is January (1.42").

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Average rainfall days in July
Charleston, SC

Average rainfall days in July - Charleston, SC
  • Average rainfall days in July: 23.3 days

The month with the highest number of rainy days is August (24.8 days).
The month with the least rainy days is November (8.7 days).

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Average snowfall in July
Charleston, SC

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

The month with the highest snowfall is January (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in July
Charleston, SC

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

The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in July
Charleston, SC

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).

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Average daylight in July /
Average sunshine in July
Charleston, SC

Average daylight in July / Average sunshine in July - Charleston, SC
  • Average daylight in July: 14h and 4min

The month with the longest days is June (Average daylight: 14h and 17min).
The month with the shortest days is December (Average daylight: 10h and 2min).

  • Average sunshine in July: 11h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in July
Charleston, SC

Average sunshine days in July - Charleston, SC
  • Average sunshine days in July: 5.7 days

The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is August (3.8 days).

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Average UV index in July
Charleston, SC

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

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Average cloud cover in July
Charleston, SC

Average cloud cover in July - Charleston, SC
  • Average cloud cover in July: 26

The months with the most cloud cover are February and December (Cloud cover 39).
The months with the least cloud cover are June and July (Cloud cover 26).

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Average visibility in July
Charleston, SC

Average visibility in July - Charleston, SC
  • Average visibility in July: 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).

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