January 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 January

In Charleston, South Carolina, January brings chilly weather. After a cooler start to the year, temperatures start to climb. Despite being the coldest month, January still experiences some warm days. The climatic conditions here lean towards mild and moist, with frequent presence of thick clouds. Substantial rainfall, totaling 1.42" (36mm), punctuates the month, while 73% relative humidity is maintained.

Temperature

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

Humidity

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

Rainfall

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

Snowfall

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

Ocean temperature

In January, the average ocean temperature is 63.1°F (17.3°C).
Note: When the surface water temperature is 63.1°F (17.3°C), most do not enjoy swimming. Breathing control becomes more complex as temperatures drop 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 the month, sunrise is at 7:22 am and sunset at 5:24 pm. On the last day of January, sunrise is at 7:15 am and sunset at 5:50 pm EST.

Sunshine

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

UV index

January is the month with the lowest UV index in Charleston, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In January, the average maximum UV index of 3 translates into the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
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Frequently asked questions

What is the coldest time of year in Charleston?

Charleston's temperature records reveal January as the coldest month, marked by average highs of 57°F (13.9°C) and lows of 44.4°F (6.9°C).

What are January temperatures in Charleston?

An average high-temperature, in January, in Charleston, is 57°F (13.9°C) and the average low-temperature is 44.4°F (6.9°C).

What are the least humid months in Charleston?

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

What is the average humidity in January in Charleston?

The average relative humidity in January in Charleston is 73%.

What is the driest month in Charleston?

The month with the least rainfall in Charleston, South Carolina, 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, during January, the rain falls for 9.8 days and regularly aggregates up to 1.42" (36mm) of precipitation.

What is the snowiest month in Charleston?

The month with the most snowfall in Charleston 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, South Carolina, in January, the average water temperature 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 Charleston, the average day length in January is 10h and 17min.

When are sunrise and sunset in January in Charleston?

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 7:15 am and sunset at 5:50 pm EST.

How long on average sun shines in January in Charleston?

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

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

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

How high is the UV index in January in Charleston?

In Charleston, South Carolina, the average daily maximum UV index in January is 3. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
60.8°F 16°C
57°F 13.9°C
60.4°F 15.8°C
Average low temperature
49.3°F 9.6°C
44.4°F 6.9°C
47.7°F 8.7°C
Average pressure
30.13" 765mmHg
30.14" 766mmHg
30.11" 765mmHg
Average wind speed
8.7mph 14km/h
8.9mph 14.3km/h
9.1mph 14.6km/h
Average max. wind speed
9.4mph 15.1km/h
9.6mph 15.4km/h
9.8mph 15.8km/h
Average wind speed gusts
13.9mph 22.4km/h
14mph 22.5km/h
14.5mph 23.3km/h
Average humidity
78%
73%
75%
Average rainfall
4.25" 108mm
1.42" 36mm
2.01" 51mm
Average rainfall days
11.1
9.8
10.8
Average snowfall
0.04" 1mm
0.12" 3mm
0" 0mm
Average snowfall days
0.1
0.4
0.1
Average sea temperature
66.3°F 19.1°C
63.1°F 17.3°C
61.9°F 16.6°C
Average daylight
10h 0min
10h 2min
11h 0min
Average sunshine
5h 4min
5h 5min
6h 4min
Average sunshine days
17.8
19.3
15.8
Average UV index
4
3
4
Average cloud cover
39%
35%
39%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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 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 January: 5h 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 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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Charleston, South Carolina, USA

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