Anchorage Weather in August

The summer weather gets wetter but stays warm during August at Anchorage, Alaska. The increase in precipitation makes this one of the city's rainiest months.

This page gives detailed information on typical August temperature, precipitation, sun, humidity, wind and storms for Anchorage. The numbers here are historical averages based on climate data gathered at the Ted Stevens Anchorage International Airport, located a few miles from downtown Anchorage.

Temperature Weather iconTemperature

64 °F August average high 18 °C
51 °F August average low 11 °C

The start of August continues with Anchorage's hottest overall temperatures of the year. From the 1st to 3rd daily highs average 66 degrees Fahrenheit (19 degrees Celsius) and nighttime lows are 53 °F (12 °C).

26 days 60 °F max. or more (16 °C)
14 days 50 °F min. or less (10 °C)

Usually every day in August warms to over 50 °F (10 °C) in Anchorage. The city averages 4 days this month when the thermometer reaches into the 70s °F (over 21 °C). Temperatures above 80 °F (27 °C) happen only rarely here during August.

The temperature can dip to 40 °F (4 °C) or below in August, but that doesn't happen every year.

Rainy Weather iconRain

2.9 in total precipitation 74 mm
14 days of rain

Half the time, Anchorage receives 1.7 to 3.9 inches (44 to 98 mm) of rainfall in August. One in four years has drier weather, while another one in four is wetter. None of the precipitation normally falls as snow.

Sunny Weather iconSun

39 % sunshine
3 days clear skies

The sun's rays reach the ground in Anchorage during 39 percent of daylight hours on average in August, for a total of 190 hours in the month. Typically on 3 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in August at Anchorage lasts for 15 hours and 41 minutes a day on average. The longest day of the month is the 1st with 17 hours and 4 minutes of daylight. By the end of the month, the days have shortened to 14:18 from sunrise to sunset. These durations can vary by a minute or three from year to year.

Humid Weather iconHumidity

75 % August average humidity

The relative humidity in Anchorage during August usually peaks at 85 percent in the morning then drops to 65 percent by mid afternoon.

Local Time12 am3 am6 am9 am12 pm3 pm6 pm9 pm
Humidity % 80 83 85 78 69 65 66 76

Windy Weather iconWind

6.9 mph August wind speed average 11.1 kph

August is an average month for wind speed at Anchorage.

Stormy Weather iconStorms

2 days rainfall of 0.5 inches (13 mm) or more
0 days with thunderstorms in August

This is the time of year when heavy rainstorms are most common in Anchorage. Every few years, the city also sees a thunderstorm during August.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

Anchorage Weather
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