Monthly weather forecast and climate
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 January

January, the same as December, in Charleston, South Carolina, is another mild winter month, with average temperature ranging between min 44.4°F (6.9°C) and max 57°F (13.9°C). The coldest month is January, with an average high-temperature of 57°F (13.9°C) and an average low-temperature of 44.4°F (6.9°C). Weather in January »

Weather in February

The last month of the winter, February, is another mild month in Charleston, South Carolina, with average temperature ranging between max 60.4°F (15.8°C) and min 47.7°F (8.7°C). In Charleston, the average high-temperature is essentially the same as in January - a still mild 60.4°F (15.8°C). Weather in February »

Weather in March

March, the first month of the spring, in Charleston, is an enjoyable month, with average temperature ranging between min 52.7°F (11.5°C) and max 65.1°F (18.4°C). In March, the average high-temperature is essentially the same as in February - a comfortable 65.1°F (18.4°C). Weather in March »

Weather in April

April in Charleston, South Carolina, is a pleasant spring month, with average temperature varying between 60.4°F (15.8°C) and 72.7°F (22.6°C). In Charleston, the average high-temperature marginally rises, from a comfortable 65.1°F (18.4°C) in March, to a pleasant 72.7°F (22.6°C). Weather in April »

Weather in May

May, the last month of the spring, in Charleston, is a moderately hot month, with temperature in the range of an average high of 79.5°F (26.4°C) and an average low of 68.2°F (20.1°C). In Charleston, the average high-temperature in May slightly increases, from a pleasant 72.7°F (22.6°C) in April, to a warm 79.5°F (26.4°C). Weather in May »

Weather in June

The first month of the summer, June, is still a warm month in Charleston, South Carolina, with average temperature fluctuating between 85.8°F (29.9°C) and 74.7°F (23.7°C). In Charleston, the average high-temperature in June slightly increases, from 79.5°F (26.4°C) in May, to a still warm 85.8°F (29.9°C). Weather in June »

Weather in July

July in Charleston, South Carolina, is a tropical summer month, with average temperature fluctuating between 88.2°F (31.2°C) and 77.4°F (25.2°C). The warmest month is July, with an average high-temperature of 88.2°F (31.2°C) and an average low-temperature of 77.4°F (25.2°C). In July, the average heat index is calculated to a sweltering 103.6°F (39.8°C). Weather in July »

Weather in August

The last month of the summer, August, is another tropical month in Charleston, South Carolina, with average temperature fluctuating between 76.8°F (24.9°C) and 87.4°F (30.8°C). In August, the average high-temperature is essentially the same as in July - a still tropical 87.4°F (30.8°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Charleston, South Carolina, with average temperature fluctuating between 83.5°F (28.6°C) and 73°F (22.8°C). In Charleston, the average high-temperature in September is practically the same as in August - a warm 83.5°F (28.6°C). Weather in September »

Weather in October

October, the same as September, is a moderately hot autumn month in Charleston, South Carolina, with average temperature fluctuating between 64°F (17.8°C) and 75.9°F (24.4°C). In October, the average high-temperature slightly decreases, from a moderately hot 83.5°F (28.6°C) in September, to a still warm 75.9°F (24.4°C). Weather in October »

Weather in November

The last month of the autumn, November, is also an enjoyable month in Charleston, South Carolina, with average temperature ranging between min 53.4°F (11.9°C) and max 65.7°F (18.7°C). In Charleston, the average high-temperature drops, from a warm 75.9°F (24.4°C) in October, to a comfortable 65.7°F (18.7°C). Weather in November »

Weather in December

December, the first month of the winter, in Charleston, is also an enjoyable month, with average temperature ranging between max 60.8°F (16°C) and min 49.3°F (9.6°C). In Charleston, the average high-temperature is practically the same as in November - a still comfortable 60.8°F (16°C). Weather in December »
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FAQ

What is the coldest month in Charleston?

January is the coldest month in Charleston, South Carolina, with an average high-temperature of 57°F (13.9°C) and an average low-temperature of 44.4°F (6.9°C).

What is the least humid month in Charleston?

January and March, with an average relative humidity of 73%, are the least humid months in Charleston.

How much does it rain in Charleston?

In Charleston, during the entire year, the rain falls for 178.9 days and collects up to 41.93" (1065mm) of precipitation.

What is the driest month in Charleston?

January is the month with the least rainfall in Charleston. Rain falls for 9.8 days and accumulates 1.42" (36mm) of precipitation.

When does it snow in Charleston?

January and December are months with snowfall.

How many days does it snow in Charleston?

In Charleston, during the entire year, snow falls for 0.6 days, and aggregates up to 0.16" (4mm) of snow.

What is the snowiest month in Charleston?

The month with the most snowfall is January when snow falls for 0.4 days and typically aggregates up to 0.12" (3mm) of snow.

When is the lowest UV index in Charleston?

With an average maximum UV index of 3, January is the month with the lowest UV index.

When it does not snow in Charleston?

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

What is the month with the coldest ocean in Charleston?

The month with the coldest seawater in Charleston, South Carolina, is February, with an average ocean temperature of 62.1°F (16.7°C).

What are the months 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.

When are the longest days in Charleston?

With an average of 14.3h of daylight, June has the longest days of the year.

What is the warmest month in Charleston?

The warmest month is July, 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 month has the most sunshine in Charleston?

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

What is the rainiest month in Charleston?

The month with the most rainfall in Charleston is August when the rain falls for 24.8 days and typically aggregates up to 7.13" (181mm) of precipitation.

What month is the ocean warmest in Charleston?

The month with the warmest seawater is August, with an average ocean temperature of 83.5°F (28.6°C).

What is the most humid month in Charleston?

The most humid month is December, with an average relative humidity of 78%.

What is the month with the shortest days in Charleston?

The month with the shortest days in Charleston is December, with an average of 10h of daylight.

What is the month with the least sunshine in Charleston?

With an average of 5.7h of sunshine, December has the least sunshine of the year in Charleston, South Carolina.

Average temperature
Charleston, SC

Average temperature - Charleston, SC

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).

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
Charleston, SC

Average pressure - Charleston, SC

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.98").

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Average wind speed
Charleston, SC

Average wind speed - Charleston, SC

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
Charleston, SC

Average humidity - Charleston, SC

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

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Average rainfall
Charleston, SC

Average rainfall - Charleston, SC

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
Charleston, SC

Average rainfall days - Charleston, SC

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
Charleston, SC

Average snowfall - Charleston, SC

The month with the highest snowfall is January (0.12").
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
Charleston, SC

Average snowfall days - Charleston, SC

The month with the highest number of snowfall days is January (0.4 days).
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
Charleston, SC

Average sea temperature - Charleston, SC

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 / Average sunshine
Charleston, SC

Average daylight / Average sunshine - Charleston, SC

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days
Charleston, SC

Average sunshine days - Charleston, SC

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 visibility
Charleston, SC

Average visibility - Charleston, SC

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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