January Weather in Washington, United States

Last updated: June 24, 2025

In Washington, United States, the average temperature in January hovers around -7°C (19°F). However, be prepared for extremes, as it can drop to a chilling -31°C (-23°F) or rise to a surprising 13°C (56°F). During this month, expect about 77 mm (3.0 in) of precipitation spread over 10 days, contributing to an average humidity of 89%. It's a time where the cold takes center stage!

January Temperature in Washington

In January in Washington, the average temperature is -7°C (19°F). Maximums can reach 13°C (56°F) and minimums can drop as low as -31°C (-23°F). Travelers should be prepared for a wide temperature range and pack accordingly to ensure comfort during their visit.

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

The chart illustrates January temperature patterns in Washington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Washington, January typically has an average temperature of -7°C (19°F), with highs reaching up to 13°C (56°F) and lows dropping to around -31°C (-23°F).

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

January Precipitation in Washington

In Washington in January, the total precipitation amount is 77 mm (3.0 in) spread over a duration of 10 days.

January Precipitation Trends in Washington

The chart displays monthly precipitation patterns in Washington, 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 Washington, January typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 10 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 Washington

In Washington in January humidity is 89%. With an average temperature of -7°C (19°F), this humidity feels like an icy mist clinging to your skin, making travel uncomfortable as each breath brings in a sharp chill that bites through layers of clothing.

January Average Humidity in Washington

This chart illustrates the average monthly humidity levels in Washington, 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 Washington 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 Washington

In Washington in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Washington, you can visit Hourly UV Index in Washington.

Maximum UV Index Levels in Washington for January

The chart shows the monthly maximum UV Index (UVI) for Washington 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 Washington typically reaches 2, which falls under the low exposure category.

Data source: Washington 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 Washington Compares to Other Months

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

This table compares monthly weather conditions in Washington, 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 (19°F)	77 mm (3.0 inches)	89%	low
February Weather	-6°C (22°F)	80 mm (3.2 inches)	88%	moderate
March Weather	-2°C (29°F)	71 mm (2.8 inches)	86%	moderate
April Weather	5°C (42°F)	117 mm (4.6 inches)	84%	very high
May Weather	12°C (55°F)	96 mm (3.8 inches)	76%	very high
June Weather	17°C (64°F)	97 mm (3.8 inches)	72%	very high
July Weather	20°C (69°F)	140 mm (5.5 inches)	66%	very high
August Weather	19°C (67°F)	98 mm (3.9 inches)	64%	very high
September Weather	15°C (60°F)	71 mm (2.8 inches)	72%	high
October Weather	9°C (48°F)	141 mm (5.6 inches)	81%	moderate
November Weather	1°C (33°F)	104 mm (4.1 inches)	87%	moderate
December Weather	-5°C (24°F)	88 mm (3.4 inches)	84%	low