nomadseason

August Weather in Unalaska, United States

Last updated: June 24, 2025

In August, the average temperature in Unalaska, United States hovers around 11°C (51°F), with a minimum dipping to 5°C (40°F) and a peak reaching 19°C (67°F). Expect some moist weather as the precipitation totals approximately 89 mm (3.5 in) over 16 days, contributing to a high average humidity of 92%.

August Temperature in Unalaska

In August in Unalaska, the average temperature is 11°C (51°F), with maximums reaching 19°C (67°F) and minimums dropping to as low as 5°C (40°F). It's a great time to visit Unalaska for mild weather and pleasant outdoor activities.

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

The chart illustrates August 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, August typically has an average temperature of 11°C (51°F), with highs reaching up to 19°C (67°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec303332354045505147423632
Data source: Temperature data for Unalaska generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Unalaska

In Unalaska in August, the precipitation amount is 89 mm (3.5 in) over the course of 16 days.

August Precipitation Trends in Unalaska

The chart displays monthly precipitation patterns in Unalaska, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Unalaska, August typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec9515792991151006589117147113157
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

August Humidity in Unalaska

In Unalaska in August humidity is 92%. With an average temperature of 11°C (51°F), this humidity feels like a thick fog wrapping around you, making travel feel heavy and stifling, as each step is accompanied by a palpable weight in the air.

August Average Humidity in Unalaska

This chart illustrates the average monthly humidity levels in Unalaska, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Unalaska is approximately 92%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Unalaska

In Unalaska in August, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Unalaska.

Maximum UV Index Levels in Unalaska for August

The chart shows the monthly maximum UV Index (UVI) for Unalaska in August, 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 August, the maximum UV index in Unalaska typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123567885321
Data source: Unalaska August 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 August 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 August’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 August’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

Compare Unalaska's Climate with Cities Worldwide