Unalaska (AK) monthly weather averages

  • Average daytime temperature

    The bar chart below shows the average monthly peak daytime temperatures at Unalaska

    Unalaska average temperature chart
    Average monthly temperatures in Unalaska (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 1.6 0.4 1.4 2.7 5.7 8.8 10.9 11.9 10.5 7.1 4.5 2.9
    °F 34.9 32.7 34.6 36.9 42.3 47.8 51.6 53.4 51 44.8 40.2 37.3

    Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

  • Average rainfall & rainy days

    The graph below shows the average rainfall and number of rainy days per month.

    Average monthly rainfall in Unalaska (mm and inches)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    mm 77 60 61 53 54 50 61 84 100 104 109 94
    inches 3 2.3 2.4 2.1 2.1 2 2.4 3.3 3.9 4.1 4.3 3.7
    Rainy days 19 17 18 18 17 16 17 20 21 23 22 21
  • Average daily sunshine

    The bar chart below shows the average daily sunshine hours in Unalaska

    Average daily sunshine Unalaska
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Hrs sunshine 6.5 7.6 8 8 8.5 8.2 7.7 7.4 7.2 6.3 5.8 6
  • Day / night temperatures

    The graph below shows the daily range of temperatures for each month.

    Maximum and minimum daily temperatures in Unalaska (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Min °C -3 -4.3 -3.6 -1.9 1.2 3.9 6.6 7.8 6 2.4 -0.1 -1.7
    Max °C 1.8 0.5 1.6 2.9 5.9 8.9 11 12 10.7 7.3 4.7 3.1
    Min °F 26.7 24.3 25.6 28.7 34.1 39 43.9 46 42.7 36.2 31.9 29
    Max °F 30.9 28.6 30.2 32.9 38.3 43.5 47.8 49.8 46.9 40.6 36.1 33.3
  • Sea temperature

    The graph below shows the average sea temperature.

    Average sea temperature around Unalaska in degrees centigrade and fahrenheit
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 4.5 4 4 4.3 5.4 7.1 9 10.3 9.9 8.3 6.7 5.5
    °F 40.1 39.2 39.1 39.7 41.7 44.8 48.1 50.6 49.8 47 44.1 41.9
  • Wind speed

    The graph below shows the average wind speed.

    Average wind speed in Unalaska (mph and kmh)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    km/h 28 29 27 27 24 23 22 23 24 26 27 28
    mph 18 18 17 17 15 14 14 14 15 16 17 17

    A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

  • Relative humidity

    The graph below shows the average relative humidity.

    Average relative humidity in Unalaska
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    83% 83% 83% 83% 85% 87% 90% 90% 87% 83% 83% 84%

Other monthly averages

UV index

Unalaska weather stats

Unalaska weather statistics
Hottest month: August 11.9°C 53.4°F
Driest month: June 50mm 2ins
Sunniest month: February 7.6hrs
Coldest month: February 0.4°C 32.7°F
Wettest month: November 109mm 4.3ins
Warmest sea: August 10.3°C 50.5°F
Map showing location of Unalaska (53.87361, -166.53667)

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