January Weather in Charleston, United States

Last updated: June 24, 2025

In January, the average temperature in Charleston, United States hovers around 7°C (45°F). While you might experience chills with minimums dipping to -13°C (9°F), the warmth can soar to a pleasant 24°C (76°F). Expect 120 mm (4.7 in) of precipitation spread over 9 days, contributing to an average humidity of 84%. Embrace the varied weather as you explore this vibrant locale!

January Temperature in Charleston

In January in Charleston, the average temperature is 7°C (45°F), with maximums reaching 24°C (76°F) and minimums dropping as low as -13°C (9°F). Travelers should be prepared for a wide range of temperatures, making layering essential for comfort.

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 (45°F), with highs reaching up to 24°C (76°F) and lows dropping to around -13°C (9°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 120 mm (4.7 in) over the course of 9 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 120 mm (4.7 inches) of precipitation spread over approximately 9 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 84%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm while exploring the sights.

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 84%, 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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Charleston for better planning.

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 4, 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	7°C (45°F)	120 mm (4.7 inches)	84%	moderate
February Weather	10°C (49°F)	195 mm (7.7 inches)	83%	high
March Weather	14°C (58°F)	168 mm (6.6 inches)	80%	very high
April Weather	17°C (63°F)	149 mm (5.9 inches)	82%	very high
May Weather	22°C (73°F)	115 mm (4.5 inches)	83%	extreme
June Weather	26°C (79°F)	134 mm (5.3 inches)	80%	extreme
July Weather	28°C (82°F)	112 mm (4.4 inches)	80%	extreme
August Weather	27°C (81°F)	124 mm (4.9 inches)	75%	very high
September Weather	25°C (78°F)	100 mm (3.9 inches)	73%	very high
October Weather	19°C (67°F)	113 mm (4.5 inches)	76%	high
November Weather	11°C (53°F)	84 mm (3.3 inches)	84%	high
December Weather	10°C (50°F)	143 mm (5.6 inches)	88%	moderate