January Weather in Summerville, United States

Last updated: June 24, 2025

In Summerville, United States, the average temperature in January hovers around -2°C (29°F). Expect a minimum plunge to -26°C (-15°F), while the thermometer can rise to a pleasant 20°C (68°F). With an average precipitation of 100 mm (3.9 in) spread over 13 days, you're likely to experience quite a bit of rain. The air is notably humid, with an average humidity of 89%, making it a uniquely atmospheric month!

January Temperature in Summerville

In January in Summerville, the average temperature is -2°C (29°F), with a maximum that can reach 20°C (68°F) and a minimum that can drop as low as -26°C (-15°F). Travelers should prepare for a wide range of temperatures and pack accordingly.

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

The chart illustrates January temperature patterns in Summerville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Summerville, January typically has an average temperature of -2°C (29°F), with highs reaching up to 20°C (68°F) and lows dropping to around -26°C (-15°F).

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

January Precipitation in Summerville

In Summerville in January, the total precipitation amount is 100 mm (3.9 in), occurring over a span of 13 days.

January Precipitation Trends in Summerville

The chart displays monthly precipitation patterns in Summerville, 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 Summerville, January typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 13 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 Summerville

In Summerville in January humidity is 89%. With an average temperature of -2°C (29°F), this humidity feels like a suffocating fog that clings to your skin, making outdoor adventures less enjoyable and giving travel a heavy and oppressive feel.

January Average Humidity in Summerville

This chart illustrates the average monthly humidity levels in Summerville, 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 Summerville is approximately 89%, 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 Summerville

In Summerville 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 Summerville, you can check the information here.

Maximum UV Index Levels in Summerville for January

The chart shows the monthly maximum UV Index (UVI) for Summerville 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 Summerville typically reaches 3, which falls under the moderate exposure category.

Data source: Summerville 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 Summerville Compares to Other Months

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

This table compares monthly weather conditions in Summerville, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	100 mm (3.9 inches)	89%	moderate
February Weather	0°C (32°F)	123 mm (4.8 inches)	90%	moderate
March Weather	4°C (39°F)	106 mm (4.2 inches)	89%	high
April Weather	9°C (49°F)	135 mm (5.3 inches)	88%	very high
May Weather	15°C (60°F)	156 mm (6.1 inches)	80%	very high
June Weather	20°C (68°F)	139 mm (5.5 inches)	79%	very high
July Weather	23°C (73°F)	137 mm (5.4 inches)	74%	very high
August Weather	22°C (71°F)	105 mm (4.1 inches)	64%	very high
September Weather	18°C (65°F)	125 mm (4.9 inches)	67%	very high
October Weather	13°C (55°F)	128 mm (5.0 inches)	81%	high
November Weather	4°C (40°F)	100 mm (3.9 inches)	89%	moderate
December Weather	1°C (34°F)	106 mm (4.2 inches)	88%	low