Last updated: June 24, 2025
In January, the average temperature in Charleston, United States hovers around 1°C (35°F), with a range that can dip to a chilly -18°C (0°F) and peak at a mild 19°C (66°F). Expect about 66 mm (2.6 in) of precipitation spread over 8 days, contributing to an average humidity of 84%. Stay prepared for the variable weather!
In January in Charleston, the average temperature is 1°C (35°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Charleston in January, the total precipitation amount is 66 mm (2.6 in) over the course of 8 days.
In Charleston in January humidity is 84%. With an average temperature of 1°C (35°F), this humidity feels like a cold, damp chill that seeps into your bones, making it feel much colder than the thermometer suggests, which can be quite uncomfortable for traveling.
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.
UV Risk Categories
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.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 1°C (35°F) | 66 mm (2.6 inches) | 84% | moderate |
February Weather | 3°C (37°F) | 107 mm (4.2 inches) | 82% | moderate |
March Weather | 6°C (43°F) | 103 mm (4.0 inches) | 81% | high |
April Weather | 12°C (53°F) | 111 mm (4.4 inches) | 78% | very high |
May Weather | 17°C (63°F) | 118 mm (4.6 inches) | 69% | very high |
June Weather | 22°C (73°F) | 94 mm (3.7 inches) | 69% | very high |
July Weather | 26°C (79°F) | 144 mm (5.6 inches) | 62% | very high |
August Weather | 25°C (77°F) | 126 mm (5.0 inches) | 65% | very high |
September Weather | 21°C (71°F) | 91 mm (3.6 inches) | 68% | very high |
October Weather | 16°C (61°F) | 130 mm (5.1 inches) | 74% | high |
November Weather | 8°C (47°F) | 82 mm (3.2 inches) | 82% | moderate |
December Weather | 4°C (39°F) | 102 mm (4.0 inches) | 80% | low |