January Weather in Snohomish, United States

Last updated: June 24, 2025

In January, the average temperature in Snohomish, United States hovers around 4°C (40°F), with a minimum dipping to -15°C (6°F) and a maximum reaching 15°C (59°F). Expect 255 mm (10.0 in) of precipitation spread over 16 days, and prepare for the high humidity, averaging 86% throughout the month.

January Temperature in Snohomish

In January in Snohomish, the average temperature is 4°C (40°F). The maximum can reach 15°C (59°F) and the minimum can be as low as -15°C (6°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.

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

The chart illustrates January temperature patterns in Snohomish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Snohomish, January typically has an average temperature of 4°C (40°F), with highs reaching up to 15°C (59°F) and lows dropping to around -15°C (6°F).

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

January Precipitation in Snohomish

In Snohomish in January, the precipitation amount is 255 mm (10.0 in) over the course of 16 days.

January Precipitation Trends in Snohomish

The chart displays monthly precipitation patterns in Snohomish, 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 Snohomish, January typically receives around 255 mm (10.0 inches) of precipitation spread over approximately 16 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Snohomish

In Snohomish in January humidity is 86%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel cumbersome as you navigate through a thick, heavy air that clings to your skin.

January Average Humidity in Snohomish

This chart illustrates the average monthly humidity levels in Snohomish, 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 Snohomish is approximately 86%, 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 Snohomish

In Snohomish 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 Snohomish, you can visit Hourly UV Index in Snohomish.

Maximum UV Index Levels in Snohomish for January

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

Data source: Snohomish 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 Snohomish Compares to Other Months

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

This table compares monthly weather conditions in Snohomish, 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 (40°F)	255 mm (10.0 inches)	86%	low
February Weather	3°C (38°F)	272 mm (10.7 inches)	86%	moderate
March Weather	6°C (44°F)	203 mm (8.0 inches)	87%	moderate
April Weather	9°C (49°F)	172 mm (6.8 inches)	84%	high
May Weather	13°C (55°F)	99 mm (3.9 inches)	81%	very high
June Weather	15°C (60°F)	89 mm (3.5 inches)	82%	very high
July Weather	18°C (64°F)	32 mm (1.3 inches)	79%	very high
August Weather	18°C (64°F)	32 mm (1.3 inches)	63%	very high
September Weather	15°C (59°F)	131 mm (5.2 inches)	62%	high
October Weather	9°C (49°F)	246 mm (9.7 inches)	83%	moderate
November Weather	7°C (44°F)	302 mm (11.9 inches)	89%	low
December Weather	4°C (39°F)	295 mm (11.6 inches)	88%	low