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January Weather in Unalaska, United States

Last updated: June 24, 2025

In January, the average temperature in Unalaska, United States hovers around -1°C (30°F), with lows plummeting to a chilly -10°C (14°F) and highs reaching a mere 6°C (42°F). Expect approximately 95 mm (3.8 in) of precipitation spread over 14 days, contributing to an average humidity of 83%. Bundle up and stay prepared for a wintery experience!

January Temperature in Unalaska

In January in Unalaska, the average temperature is -1°C (30°F), with a maximum that can reach 6°C (42°F) and a minimum that can be as low as -10°C (14°F). Travelers should be prepared for cold weather conditions and pack appropriately for varying temperatures.

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

The chart illustrates January temperature patterns in Unalaska, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Unalaska, January typically has an average temperature of -1°C (30°F), with highs reaching up to 6°C (42°F) and lows dropping to around -10°C (14°F).
JanFebMarAprMayJunJulAugSepOctNovDec303332354045505147423632
Data source: Temperature data for Unalaska generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Unalaska

In Unalaska in January, the precipitation amount is 95 mm (3.8 in) over the course of 14 days.

January Precipitation Trends in Unalaska

The chart displays monthly precipitation patterns in Unalaska, 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 Unalaska, January typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec9515792991151006589117147113157
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Unalaska

In Unalaska in January humidity is 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

January Average Humidity in Unalaska

This chart illustrates the average monthly humidity levels in Unalaska, 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 Unalaska is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%84%83%84%90%93%95%92%86%82%81%83%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Unalaska

In Unalaska in January, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Unalaska.

Maximum UV Index Levels in Unalaska for January

The chart shows the monthly maximum UV Index (UVI) for Unalaska 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 Unalaska typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123567885321
Data source: Unalaska 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 Unalaska Compares to Other Months

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

This table compares monthly weather conditions in Unalaska, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)95 mm (3.8 inches)83%low
February Weather1°C (33°F)157 mm (6.2 inches)84%low
March Weather0°C (32°F)92 mm (3.6 inches)83%moderate
April Weather2°C (35°F)99 mm (3.9 inches)84%moderate
May Weather4°C (40°F)115 mm (4.5 inches)90%high
June Weather7°C (46°F)100 mm (3.9 inches)93%high
July Weather10°C (50°F)65 mm (2.6 inches)95%very high
August Weather11°C (51°F)89 mm (3.5 inches)92%very high
September Weather9°C (48°F)117 mm (4.6 inches)86%moderate
October Weather5°C (42°F)147 mm (5.8 inches)82%moderate
November Weather2°C (37°F)113 mm (4.5 inches)81%low
December Weather0°C (32°F)157 mm (6.2 inches)82%low

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