January Weather in Tumwater, United States

Last updated: June 24, 2025

In Tumwater, United States, the average temperature in January is a brisk 5°C (42°F). Expect minimum temperatures to dip as low as -6°C (21°F), while highs can reach up to 14°C (57°F). During this month, precipitation amounts to 197 mm (7.8 in) over approximately 16 days, contributing to an average humidity of a substantial 86%. Prepare for a misty and cool atmosphere!

January Temperature in Tumwater

In January in Tumwater, the average temperature is 5°C (42°F). The maximum can reach 14°C (57°F), while the minimum can drop to as low as -6°C (21°F). Be prepared for chilly weather and pack warm layers for your trip!

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

The chart illustrates January temperature patterns in Tumwater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tumwater, January typically has an average temperature of 5°C (42°F), with highs reaching up to 14°C (57°F) and lows dropping to around -6°C (21°F).

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

January Precipitation in Tumwater

In Tumwater in January, the total precipitation amount reaches 197 mm (7.8 in) over the course of 16 days.

January Precipitation Trends in Tumwater

The chart displays monthly precipitation patterns in Tumwater, 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 Tumwater, January typically receives around 197 mm (7.8 inches) of precipitation spread over approximately 16 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 Tumwater

In Tumwater in January, humidity is 86%. With an average temperature of 5°C (42°F), this humidity feels like a damp chill that penetrates your layers, making outdoor activities quite uncomfortable and prompting you to seek warmth indoors more often.

January Average Humidity in Tumwater

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

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

Maximum UV Index Levels in Tumwater for January

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

Data source: Tumwater 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 Tumwater Compares to Other Months

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

This table compares monthly weather conditions in Tumwater, 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 (42°F)	197 mm (7.8 inches)	86%	low
February Weather	5°C (41°F)	155 mm (6.1 inches)	84%	moderate
March Weather	7°C (45°F)	134 mm (5.3 inches)	85%	moderate
April Weather	10°C (50°F)	117 mm (4.6 inches)	83%	high
May Weather	13°C (56°F)	65 mm (2.6 inches)	84%	very high
June Weather	16°C (61°F)	51 mm (2.0 inches)	84%	very high
July Weather	18°C (65°F)	9 mm (0.4 inches)	82%	very high
August Weather	19°C (66°F)	12 mm (0.5 inches)	73%	very high
September Weather	16°C (61°F)	88 mm (3.5 inches)	74%	high
October Weather	11°C (52°F)	133 mm (5.3 inches)	83%	moderate
November Weather	8°C (46°F)	192 mm (7.5 inches)	86%	moderate
December Weather	5°C (42°F)	203 mm (8.0 inches)	87%	low