January 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 January

January, the same as December, in Charleston, South Carolina, is a moderate winter month, with an average temperature fluctuating between 57°F (13.9°C) and 44.4°F (6.9°C).

Temperature

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).

Humidity

The months with the lowest humidity are January and March, with an average relative humidity of 73%.

Rainfall

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

Snowfall

Months with snowfall are January and December. 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.

Ocean temperature

In Charleston, the average seawater temperature in January is 63.1°F (17.3°C).
Note: Swimming in 63.1°F (17.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In Charleston, the average length of the day in January is 10h and 17min.
On the first day of January, sunrise is at 7:22 am and sunset at 5:24 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:51 pm EST.

Sunshine

In Charleston, the average sunshine in January is 5.8h.

UV index

The month with the lowest UV index in Charleston, South Carolina, is January, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 3 in January transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Charleston?

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

What are the least humid months in Charleston?

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

What is the average humidity in January in Charleston?

In January, the average relative humidity is 73%.

What is the driest month in Charleston?

The month with the least rainfall is January, when the rain falls for 9.8 days and typically collects 1.42" (36mm) of precipitation.

How much does it rain in Charleston in January?

In Charleston, South Carolina, in January, during 9.8 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

When does it snow the most in Charleston?

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

What is the last month it snows in Charleston?

January is the last month it regularly snows. During 0.4 snowfall days, in January, Charleston aggregates 0.12" (3mm) of snow.

How cold is the water in January in Charleston?

In Charleston, the average seawater temperature in January is 63.1°F (17.3°C). For most, swimming in 63.1°F (17.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

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

In January, the average day length in Charleston, South Carolina, is 10h and 17min.

What time are sunrise and sunset in January in Charleston?

On the first day of January in Charleston, sunrise is at 7:22 am and sunset at 5:24 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 5:51 pm EST.

How long on average sun shines in January in Charleston?

The average sunshine duration in January in Charleston, South Carolina, is 5.8h.

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

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

How high is the UV index in January in Charleston?

In January, the average daily maximum UV index in Charleston is 3. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Charleston, SC

Average temperature in January - Charleston, SC
  • Average high temperature in January: 57°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 January: 44.4°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 January
Charleston, SC

Average pressure in January - Charleston, SC
  • Average pressure in January: 30.14"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 January
Charleston, SC

Average wind speed in January - Charleston, SC
  • Average wind speed in January: 8.9mph

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 January
Charleston, SC

Average humidity in January - Charleston, SC
  • Average humidity in January: 73%

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 January
Charleston, SC

Average rainfall in January - Charleston, SC
  • Average rainfall in January: 1.42"

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 January
Charleston, SC

Average rainfall days in January - Charleston, SC
  • Average rainfall days in January: 9.8 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 January
Charleston, SC

Average snowfall in January - Charleston, SC
  • Average snowfall in January: 0.12"

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 January
Charleston, SC

Average snowfall days in January - Charleston, SC
  • Average snowfall days in January: 0.4 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 January
Charleston, SC

Average sea temperature in January - Charleston, SC
  • Average sea temperature in January: 63.1°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 January /
Average sunshine in January
Charleston, SC

Average daylight in January / Average sunshine in January - Charleston, SC
  • Average daylight in January: 10h 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 January: 5h 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 January
Charleston, SC

Average sunshine days in January - Charleston, SC
  • Average sunshine days in January: 19.3 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 January
Charleston, SC

Average UV index in January - Charleston, SC
  • Average UV index in January: 3

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 January
Charleston, SC

Average cloud cover in January - Charleston, SC
  • Average cloud cover in January: 35

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 January
Charleston, SC

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