June 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 June

June steers Charleston right into the heart of summer. The prominence of sunny days combined with optimal sea temperatures marks the start of the busy tourist season. Dealing with the heat becomes easier for locals and visitors alike, as they find respite in the cooling evening sea breezes. Of note, June stands out with the highest amount of rainfall, registering at 4.45".

Temperature

With the onset of June, Charleston's average high-temperature experiences a slight rise, moving from May's 79.5°F to a still moderately hot 85.8°F. In Charleston, June nights witness a steady temperature drop to a still warm 74.7°F.

Heat index

For most parts of June, the heat index is evaluated at a very hot 96.8°F. Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

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

Rainfall

In Charleston, during June, the rain falls for 20.5 days and regularly aggregates up to 4.45" of precipitation. In Charleston, during the entire year, the rain falls for 178.9 days and collects up to 41.93" of precipitation.

Snowfall

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

Ocean temperature

In June, the average ocean temperature in Charleston is 79.3°F.
Note: Surface water temperatures between 77°F and 84.2°F are perceived as excellent and extremely agreeable for enduring enjoyment in water activities.

Daylight

June has the longest days of the year in Charleston, with an average of 14h and 18min of daylight.
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 6:14 am and sunset at 8:31 pm EDT.

Sunshine

The average sunshine in June in Charleston is 10.8h.

UV index

May through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In June, an average UV index of 7 transforms into the following instructions:
Undertake protective measures and comply with sun safety rules. Shielding against skin and eye damage is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. 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. Caution! The Sun's UV rays become stronger due to reflections from water and sand.
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FAQ

How hot is June in Charleston?

In Charleston, 85.8°F is the average high-temperature and 74.7°F is the average low-temperature during June. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in June is evaluated at 96.8°F.

What is the average humidity in June in Charleston?

In June, the average relative humidity is 75%.

How much does it rain in Charleston in June?

In Charleston, in June, it is raining for 20.5 days, with typically 4.45" of accumulated precipitation.

When it does not snow in Charleston?

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

What is the ocean temperature in June in Charleston?

In June, the average ocean temperature in Charleston is 79.3°F. Water temperature between 77°F and 84.2°F is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

When are the longest days in Charleston?

The month with the longest days in Charleston is June, with an average of 14h and 18min of daylight.

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

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

What time are sunrise and sunset in June in Charleston?

In June, on the first day of the month, sunrise is at 6:12 am and sunset at 8:22 pm. On the last day of the month, sunrise is at 6:14 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?

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

What is the UV index reading in June in Charleston?

The average daily maximum UV index in June in Charleston, South Carolina, is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJuneJASOND
May
June
Jul
Average high temperature
79.5°F
85.8°F
88.2°F
Average low temperature
68.2°F
74.7°F
77.4°F
Average pressure
30.03"Hg
29.98"Hg
30"Hg
Average wind speed
8.6mph
8mph
8.1mph
Average max. wind speed
9.2mph
8.6mph
8.8mph
Average wind speed gusts
13.4mph
12.3mph
12.3mph
Average humidity
75%
75%
75%
Average rainfall
2.87"
4.45"
4.72"
Average rainfall days
15.8
20.5
23.3
Average snowfall
0"
0"
0"
Average snowfall days
0
0
0
Average sea temperature
73°F
79.3°F
83°F
Average daylight
13h 5min
14h 2min
14h 1min
Average sunshine
10h 3min
10h 5min
11h 0min
Average sunshine days
13.3
6.7
5.7
Average UV index
7
7
7
Average cloud cover
27%
26%
26%
Average visibility
6mi
6mi
6mi

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 2min

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 June: 10h and 5min

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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Charleston, South Carolina, USA

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