January Weather in Charleston, United States

Last updated: June 24, 2025

In January, the average temperature in Charleston, United States is a brisk -7°C (21°F), with potential extremes ranging from a chilling -33°C (-26°F) to a mild 13°C (55°F). During this month, you can expect about 89 mm (3.5 in) of precipitation spread over 8 days, contributing to an average humidity of 88%. Prepare for a wintry atmosphere!

January Temperature in Charleston

In January in Charleston, the average temperature is -7°C (21°F). Maximum temperatures can reach 13°C (55°F), while the minimum can plunge as low as -33°C (-26°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for extreme cold.

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 -7°C (21°F), with highs reaching up to 13°C (55°F) and lows dropping to around -33°C (-26°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 89 mm (3.5 in) over a span 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 89 mm (3.5 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 88%. With an average temperature of -7°C (21°F), this humidity feels like a biting cold that seeps into your bones, making travel uncomfortable and challenging as you navigate through the frosty air and slippery surfaces.

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 88%, 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 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Charleston, you can visit Hourly UV Index in Charleston.

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 2, which falls under the low 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	-7°C (21°F)	89 mm (3.5 inches)	88%	low
February Weather	-5°C (23°F)	81 mm (3.2 inches)	88%	moderate
March Weather	-1°C (30°F)	73 mm (2.9 inches)	85%	moderate
April Weather	6°C (43°F)	124 mm (4.9 inches)	81%	high
May Weather	12°C (54°F)	97 mm (3.8 inches)	76%	very high
June Weather	18°C (64°F)	84 mm (3.3 inches)	74%	very high
July Weather	21°C (70°F)	103 mm (4.0 inches)	74%	very high
August Weather	20°C (69°F)	82 mm (3.2 inches)	74%	very high
September Weather	16°C (61°F)	76 mm (3.0 inches)	77%	high
October Weather	10°C (50°F)	126 mm (5.0 inches)	82%	moderate
November Weather	2°C (36°F)	118 mm (4.6 inches)	85%	moderate
December Weather	-4°C (25°F)	113 mm (4.4 inches)	84%	low