January Weather in South Boston, United States

Last updated: June 24, 2025

In January, the average temperature in South Boston, United States is a cool 5°C (41°F), with fluctuations ranging from a chilly -14°C (6°F) to a warm 24°C (76°F). Expect 73 mm (2.9 in) of precipitation over 8 days, leading to an average humidity of 84%. Embrace the brisk air and stay prepared for the varying conditions!

January Temperature in South Boston

In January in South Boston, the average temperature is 5°C (41°F). The maximum can reach 24°C (76°F), while the minimum can be as low as -14°C (6°F). Be prepared for a wide range of temperatures if you're planning to visit during this time.

January Weather in South Boston: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in South Boston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Boston, January typically has an average temperature of 5°C (41°F), with highs reaching up to 24°C (76°F) and lows dropping to around -14°C (6°F).

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

January Precipitation in South Boston

In South Boston in January, the precipitation amount is 73 mm (2.9 in) over a span of 8 days.

January Precipitation Trends in South Boston

The chart displays monthly precipitation patterns in South Boston, 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 South Boston, January typically receives around 73 mm (2.9 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 South Boston

In South Boston in January humidity is 84%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through the cold, heavy air that clings to your skin.

January Average Humidity in South Boston

This chart illustrates the average monthly humidity levels in South Boston, 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 South Boston 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 South Boston

In South Boston 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 South Boston, you can check the information here.

Maximum UV Index Levels in South Boston for January

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

Data source: South Boston 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 South Boston Compares to Other Months

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

This table compares monthly weather conditions in South Boston, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	73 mm (2.9 inches)	84%	moderate
February Weather	8°C (46°F)	108 mm (4.2 inches)	84%	high
March Weather	11°C (51°F)	72 mm (2.8 inches)	84%	high
April Weather	16°C (61°F)	120 mm (4.7 inches)	82%	very high
May Weather	21°C (69°F)	110 mm (4.3 inches)	82%	extreme
June Weather	24°C (76°F)	92 mm (3.6 inches)	83%	extreme
July Weather	27°C (81°F)	69 mm (2.7 inches)	79%	very high
August Weather	26°C (79°F)	109 mm (4.3 inches)	77%	very high
September Weather	23°C (74°F)	98 mm (3.9 inches)	75%	very high
October Weather	18°C (64°F)	106 mm (4.2 inches)	81%	very high
November Weather	10°C (50°F)	75 mm (3.0 inches)	87%	moderate
December Weather	7°C (45°F)	96 mm (3.8 inches)	85%	moderate