January Weather in Salem, United States

Last updated: June 24, 2025

In January, the average temperature in Salem, United States hovers around 4°C (39°F). While you may experience chilly nights with a minimum of -13°C (9°F), daytime could surprise you with max temperatures reaching 21°C (69°F). Expect about 102 mm (4.0 in) of precipitation spread over 11 days, contributing to the high average humidity of 87%. Bring your warm gear and an umbrella!

January Temperature in Salem

In January in Salem, the average temperature is 4°C (39°F). Maximum temperatures can reach 21°C (69°F), while minimums can drop as low as -13°C (9°F). Travelers should be prepared for a wide range of weather conditions during this time.

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

The chart illustrates January temperature patterns in Salem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Salem, January typically has an average temperature of 4°C (39°F), with highs reaching up to 21°C (69°F) and lows dropping to around -13°C (9°F).

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

January Precipitation in Salem

In Salem in January, the precipitation amount is 102 mm (4.0 in) over the course of 11 days.

January Precipitation Trends in Salem

The chart displays monthly precipitation patterns in Salem, 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 Salem, January typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 11 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 Salem

In Salem in January, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

January Average Humidity in Salem

This chart illustrates the average monthly humidity levels in Salem, 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 Salem is approximately 87%, 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 Salem

In Salem 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 Salem, you can check the information here.

Maximum UV Index Levels in Salem for January

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

Data source: Salem 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 Salem Compares to Other Months

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

This table compares monthly weather conditions in Salem, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	102 mm (4.0 inches)	87%	moderate
February Weather	6°C (44°F)	192 mm (7.6 inches)	86%	high
March Weather	10°C (50°F)	149 mm (5.9 inches)	86%	high
April Weather	14°C (57°F)	147 mm (5.8 inches)	82%	very high
May Weather	20°C (68°F)	142 mm (5.6 inches)	82%	very high
June Weather	24°C (75°F)	162 mm (6.4 inches)	83%	extreme
July Weather	26°C (79°F)	119 mm (4.7 inches)	80%	extreme
August Weather	25°C (77°F)	120 mm (4.7 inches)	74%	very high
September Weather	22°C (73°F)	124 mm (4.9 inches)	71%	very high
October Weather	17°C (63°F)	122 mm (4.8 inches)	78%	high
November Weather	9°C (48°F)	84 mm (3.3 inches)	88%	moderate
December Weather	7°C (44°F)	145 mm (5.7 inches)	88%	moderate