January Weather in Napavine, United States

Last updated: June 24, 2025

In January, the average temperature in Napavine, United States hovers around 5°C (41°F). You'll experience chilly days, with a minimum dip to -9°C (16°F) and occasional highs reaching 15°C (59°F). Prepare for some wet weather, as the region receives about 177 mm (7.0 in) of precipitation over 17 days, coupled with a high average humidity of 86%.

January Temperature in Napavine

In January in Napavine, the average temperature is 5°C (41°F). Maximum temperatures can reach up to 15°C (59°F), while minimums can dip as low as -9°C (16°F). Travelers should prepare for a mix of chilly days and mild afternoons, making layer options essential for comfort.

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

The chart illustrates January temperature patterns in Napavine, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Napavine, January typically has an average temperature of 5°C (41°F), with highs reaching up to 15°C (59°F) and lows dropping to around -9°C (16°F).

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

January Precipitation in Napavine

In Napavine in January, the total precipitation amount is 177 mm (7.0 in) spread over 17 days.

January Precipitation Trends in Napavine

The chart displays monthly precipitation patterns in Napavine, 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 Napavine, January typically receives around 177 mm (7.0 inches) of precipitation spread over approximately 17 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 Napavine

In Napavine in January humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

January Average Humidity in Napavine

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

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

Maximum UV Index Levels in Napavine for January

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

Data source: Napavine 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 Napavine Compares to Other Months

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

This table compares monthly weather conditions in Napavine, 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)	177 mm (7.0 inches)	86%	low
February Weather	4°C (40°F)	159 mm (6.3 inches)	84%	moderate
March Weather	7°C (45°F)	143 mm (5.6 inches)	85%	moderate
April Weather	10°C (50°F)	121 mm (4.7 inches)	83%	high
May Weather	13°C (56°F)	76 mm (3.0 inches)	84%	very high
June Weather	16°C (61°F)	56 mm (2.2 inches)	84%	very high
July Weather	18°C (65°F)	11 mm (0.4 inches)	82%	very high
August Weather	19°C (66°F)	11 mm (0.4 inches)	73%	very high
September Weather	16°C (61°F)	84 mm (3.3 inches)	74%	high
October Weather	10°C (50°F)	125 mm (4.9 inches)	83%	moderate
November Weather	7°C (45°F)	166 mm (6.5 inches)	86%	moderate
December Weather	4°C (40°F)	193 mm (7.6 inches)	87%	low