June weather forecast
Charleston, SC

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

Weather in June

June, the first month of the summer in Charleston, is still a warm month, with an average temperature fluctuating between 74.7°F (23.7°C) and 85.8°F (29.9°C).

Temperature

In June, the average high-temperature marginally rises from a warm 79.5°F (26.4°C) in May to a still moderately hot 85.8°F (29.9°C). In Charleston, in June, the average low-temperature is 74.7°F (23.7°C).

Heat index

The average heat index in June is computed to be a sweltering 96.8°F (36°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. 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', 'apparent temperature', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, clothing, pregnancy), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. 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 surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in June in Charleston is 75%.

Rainfall

In Charleston, it is raining for 20.5 days, with typically 4.45" (113mm) of accumulated precipitation. In Charleston, during the entire year, the rain falls for 178.9 days and collects up to 41.93" (1065mm) of precipitation.

Snowfall

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

Ocean temperature

In Charleston, South Carolina, the average seawater temperature in June is 79.3°F (26.3°C).
Note: 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.

Daylight

With an average of 14h and 17min of daylight, June has the longest days of the year in Charleston.
On the first day of the month, sunrise is at 6:12 am and sunset at 8:22 pm. On the last day of June, in Charleston, sunrise is at 6:15 am and sunset at 8:31 pm EDT.

Sunshine

The average sunshine in June is 10.8h.

UV index

The months with the highest UV index are May through August, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In June, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in June in Charleston?

In Charleston, in June, the average high-temperature is 85.8°F (29.9°C), and the average low-temperature is 74.7°F (23.7°C). In June, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, is computed to be 96.8°F (36°C).

What is the average humidity in June in Charleston?

The average relative humidity in June in Charleston, South Carolina, is 75%.

How much does it rain in Charleston in June?

In Charleston, South Carolina, during June, the rain falls for 20.5 days and regularly aggregates up to 4.45" (113mm) 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 June in Charleston?

In Charleston, the average seawater temperature in June is 79.3°F (26.3°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.

When are the longest days in Charleston?

With an average of 14h and 17min of daylight, June has the longest days of the year in Charleston, South Carolina.

What is the average length of the day in June in Charleston?

The average day length in June is 14h and 17min.

What time are sunrise and sunset in June in Charleston?

On the first day of June, sunrise is at 6:12 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 6:15 am and sunset at 8:31 pm EDT.

How long on average sun shines in June in Charleston?

In Charleston, the average sunshine duration in June is 10.8h.

When is the highest UV index in Charleston?

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

What is the UV index reading in June in Charleston?

In June, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in June
Charleston, SC

Average temperature in June - Charleston, SC
  • Average high temperature in June: 85.8°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 June: 74.7°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 June
Charleston, SC

Average pressure in June - Charleston, SC
  • Average pressure in June: 29.98"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 June
Charleston, SC

Average wind speed in June - Charleston, SC
  • Average wind speed in June: 8mph

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 June
Charleston, SC

Average humidity in June - Charleston, SC
  • Average humidity in June: 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 June
Charleston, SC

Average rainfall in June - Charleston, SC
  • Average rainfall in June: 4.45"

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 June
Charleston, SC

Average rainfall days in June - Charleston, SC
  • Average rainfall days in June: 20.5 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 June
Charleston, SC

Average snowfall in June - Charleston, SC
  • Average snowfall in June: 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 June
Charleston, SC

Average snowfall days in June - Charleston, SC
  • Average snowfall days in June: 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 June
Charleston, SC

Average sea temperature in June - Charleston, SC
  • Average sea temperature in June: 79.3°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 June /
Average sunshine in June
Charleston, SC

Average daylight in June / Average sunshine in June - Charleston, SC
  • Average daylight in June: 14h and 17min

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 June: 10h and 48min

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 June
Charleston, SC

Average sunshine days in June - Charleston, SC
  • Average sunshine days in June: 6.7 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 June
Charleston, SC

Average UV index in June - Charleston, SC
  • Average UV index in June: 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 June
Charleston, SC

Average cloud cover in June - Charleston, SC
  • Average cloud cover in June: 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 June
Charleston, SC

Average visibility in June - Charleston, SC
  • Average visibility in June: 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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