January Weather in Juneau, United States

Last updated: June 24, 2025

In January, the average temperature in Juneau, United States hovers around -6°C (21°F). Expect chilly extremes, with minimum temperatures plunging to a frigid -33°C (-26°F) and occasionally rising as high as 11°C (51°F). Precipitation is relatively modest, totaling 48 mm (1.9 in) over about 7 days, while the atmosphere remains quite damp, with an average humidity of 85%.

January Temperature in Juneau

In January in Juneau, the average temperature is -6°C (21°F). Maximums can reach 11°C (51°F), while minimums can drop as low as -33°C (-26°F). It's essential to prepare for extreme temperature fluctuations when traveling to Juneau during this time.

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

The chart illustrates January temperature patterns in Juneau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Juneau, January typically has an average temperature of -6°C (21°F), with highs reaching up to 11°C (51°F) and lows dropping to around -33°C (-26°F).

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

January Precipitation in Juneau

In Juneau in January, the total precipitation amount is 48 mm (1.9 in) over a span of 7 days.

January Precipitation Trends in Juneau

The chart displays monthly precipitation patterns in Juneau, 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 Juneau, January typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 7 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 Juneau

In Juneau in January, humidity is 85%. With an average temperature of -6°C (21°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and forcing you to bundle up even more than usual as you navigate through frosty air.

January Average Humidity in Juneau

This chart illustrates the average monthly humidity levels in Juneau, 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 Juneau is approximately 85%, 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 Juneau

In Juneau in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Juneau, you can check the information here.

Maximum UV Index Levels in Juneau for January

The chart shows the monthly maximum UV Index (UVI) for Juneau 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 Juneau typically reaches 3, which falls under the moderate exposure category.

Data source: Juneau 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 Juneau Compares to Other Months

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

This table compares monthly weather conditions in Juneau, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	48 mm (1.9 inches)	85%	moderate
February Weather	-6°C (22°F)	50 mm (2.0 inches)	85%	moderate
March Weather	1°C (35°F)	58 mm (2.3 inches)	85%	moderate
April Weather	7°C (45°F)	104 mm (4.1 inches)	85%	very high
May Weather	15°C (59°F)	120 mm (4.7 inches)	78%	very high
June Weather	21°C (69°F)	110 mm (4.3 inches)	80%	very high
July Weather	23°C (74°F)	102 mm (4.0 inches)	78%	very high
August Weather	21°C (71°F)	97 mm (3.8 inches)	76%	very high
September Weather	18°C (64°F)	93 mm (3.6 inches)	79%	high
October Weather	10°C (51°F)	112 mm (4.4 inches)	83%	moderate
November Weather	2°C (36°F)	45 mm (1.8 inches)	88%	moderate
December Weather	-2°C (29°F)	46 mm (1.8 inches)	81%	low