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 is a crucial month for Charleston, marking the zenith of summer. The weather is typically hot and humid, with some rainfall offering brief respite from the neck-cranking heat. Standing at its peak, July signals a slight uptick in relative humidity at 75%. The hottest days of the year can be expected during this time as Charleston experiences its highest mean temperatures.

Temperature

July is the month that records the highest temperatures, with averages ranging from a high of 88.2°F to a low of 77.4°F.

Heat index

The heat index for July is evaluated at a blisteringly hot 104°F. Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Heat index determinations are made taking into account the shade and light air movements. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', ties air temperature with relative humidity to produce the perceived temperature sensation. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

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

Rainfall

In July, the rain falls for 23.3 days. Throughout July, 4.72" of precipitation is accumulated. Throughout the year, there are 178.9 rainfall days, and 41.93" of precipitation is accumulated.

Snowfall

February through November are months without snowfall in Charleston.

Ocean temperature

In Charleston, the average seawater temperature in July is 82.9°F.
Note: Water temperatures between 77°F and 84.2°F are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.

Daylight

In July, the average length of the day is 14h and 4min.
On the first day of July, sunrise is at 6:15 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 8:19 pm EDT.

Sunshine

The month with the most sunshine in Charleston is July, with an average of 11h of sunshine.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In July, a daily UV index of 7 turns into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Warning! The reflection of sand and water increases the UV dose.
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FAQ

What is the warmest month in Charleston?

July is the warmest month, with the temperature often reaching an average high of 88.2°F and an average low of 77.4°F.

How hot is July in Charleston?

The high-temperature, in July, in Charleston, is 88.2°F, while the low-temperature averages to 77.4°F. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in July is evaluated at 104°F.

What is the average humidity in July in Charleston?

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

How many days does it rain in July in Charleston?

In Charleston, South Carolina, in July, during 23.3 rainfall days, 4.72" of precipitation is typically accumulated.

When it does not snow in Charleston?

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

How warm is the water in July in Charleston?

In Charleston, in July, the average water temperature is 82.9°F. For any water activity, surface water temperatures between 77°F and 84.2°F are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does Charleston have in July?

In Charleston, the average day length in July is 14h and 4min.

What time are sunrise and sunset in July in Charleston?

On the first day of July in Charleston, sunrise is at 6:15 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 6:32 am and sunset at 8:19 pm EDT.

What month has the most sunshine in Charleston?

The month with the most sunshine in Charleston, South Carolina, is July, with an average of 11h of sunshine.

How many hours of sunshine does Charleston have in July?

In Charleston, the average sunshine duration in July is 11h.

What is the month with the highest UV index in Charleston?

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

How high is the UV index in July in Charleston?

In Charleston, the average daily maximum UV index in July is 7. A UV Index of 6 to 7 symbolizes 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
88.2°F
87.4°F
Average low temperature
74.7°F
77.4°F
76.8°F
Average pressure
29.98"Hg
30"Hg
29.99"Hg
Average wind speed
8mph
8.1mph
7.5mph
Average max. wind speed
8.6mph
8.8mph
8mph
Average wind speed gusts
12.3mph
12.3mph
11.4mph
Average humidity
75%
75%
76%
Average rainfall
4.45"
4.72"
7.13"
Average rainfall days
20.5
23.3
24.8
Average snowfall
0"
0"
0"
Average snowfall days
0
0
0
Average sea temperature
79.3°F
83°F
83.5°F
Average daylight
14h 2min
14h 1min
13h 2min
Average sunshine
10h 5min
11h 0min
10h 5min
Average sunshine days
6.7
5.7
3.8
Average UV index
7
7
7
Average cloud cover
26%
26%
28%
Average visibility
6mi
6mi
6mi

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 1min

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 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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Charleston, South Carolina, USA

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