January Weather in Washington, United States

Last updated: June 24, 2025

In January, the average temperature in Washington, United States is a brisk 5°C (41°F). Expect a wide range, with a minimum dropping to a chilly -16°C (4°F) and a maximum soaring to a warm 25°C (77°F). The region sees 49 mm (1.9 in) of precipitation spread over 4 days, and you'll likely feel the humidity at an average of 76%. Be prepared for varied weather conditions!

January Temperature in Washington

In January in Washington, the average temperature is 5°C (41°F). Maximum temperatures can reach 25°C (77°F), while minimum temperatures can drop as low as -16°C (4°F). Be prepared for a wide range of weather conditions while traveling to Washington during this month.

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 5°C (41°F), with highs reaching up to 25°C (77°F) and lows dropping to around -16°C (4°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 49 mm (1.9 in) spread over a duration of 4 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 49 mm (1.9 inches) of precipitation spread over approximately 4 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 76%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and prompting travelers to seek shelter or warm layers.

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 76%, 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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Washington for better planning.

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 4, which falls under the moderate 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	5°C (41°F)	49 mm (1.9 inches)	76%	moderate
February Weather	6°C (42°F)	52 mm (2.1 inches)	76%	high
March Weather	13°C (55°F)	99 mm (3.9 inches)	70%	very high
April Weather	16°C (60°F)	125 mm (4.9 inches)	72%	very high
May Weather	21°C (71°F)	149 mm (5.9 inches)	82%	very high
June Weather	26°C (79°F)	75 mm (3.0 inches)	82%	extreme
July Weather	28°C (83°F)	45 mm (1.8 inches)	80%	extreme
August Weather	28°C (82°F)	61 mm (2.4 inches)	72%	extreme
September Weather	24°C (76°F)	101 mm (4.0 inches)	64%	very high
October Weather	17°C (63°F)	107 mm (4.2 inches)	71%	high
November Weather	11°C (51°F)	30 mm (1.2 inches)	81%	moderate
December Weather	7°C (45°F)	37 mm (1.5 inches)	84%	moderate