January Weather in Charleston, United States

Last updated: June 24, 2025

In Charleston, United States, the average temperature in January hovers around 3°C (38°F). However, temperatures can vary widely, with lows plunging to -17°C (2°F) and highs reaching up to 22°C (71°F). Expect about 110 mm (4.3 in) of precipitation over 8 days, and prepare for a rather humid environment, with average humidity levels at 86%.

January Temperature in Charleston

In January in Charleston, the average temperature is 3°C (38°F). Maximums can reach up to 22°C (71°F), while minimums can drop as low as -17°C (2°F). Be prepared for a wide range of temperatures when traveling during this time.

January Weather in Charleston: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Charleston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Charleston, January typically has an average temperature of 3°C (38°F), with highs reaching up to 22°C (71°F) and lows dropping to around -17°C (2°F).

Data source: Temperature data for Charleston generated using information from the Copernicus Climate Change Service.

January Precipitation in Charleston

In Charleston in January, the precipitation amount is 110 mm (4.3 in) over a period of 8 days.

January Precipitation Trends in Charleston

The chart displays monthly precipitation patterns in Charleston, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Charleston, January typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Charleston

In Charleston in January humidity is 86%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps through your layers, making traveling uncomfortable as breath clouds visibly in the crisp air.

January Average Humidity in Charleston

This chart illustrates the average monthly humidity levels in Charleston, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Charleston is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Charleston

In Charleston in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Charleston, you can check the information here.

Maximum UV Index Levels in Charleston for January

The chart shows the monthly maximum UV Index (UVI) for Charleston in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Charleston typically reaches 3, which falls under the moderate exposure category.

Data source: Charleston January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Charleston Compares to Other Months

Weather in Charleston varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Charleston, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Charleston, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	110 mm (4.3 inches)	86%	moderate
February Weather	5°C (41°F)	139 mm (5.5 inches)	84%	high
March Weather	10°C (51°F)	169 mm (6.6 inches)	84%	high
April Weather	14°C (58°F)	140 mm (5.5 inches)	80%	very high
May Weather	21°C (70°F)	151 mm (6.0 inches)	82%	extreme
June Weather	25°C (78°F)	112 mm (4.4 inches)	83%	extreme
July Weather	27°C (81°F)	101 mm (4.0 inches)	79%	very high
August Weather	25°C (78°F)	102 mm (4.0 inches)	76%	very high
September Weather	23°C (74°F)	85 mm (3.3 inches)	75%	very high
October Weather	16°C (62°F)	122 mm (4.8 inches)	74%	high
November Weather	8°C (47°F)	101 mm (4.0 inches)	85%	moderate
December Weather	6°C (43°F)	97 mm (3.8 inches)	88%	moderate