The highest day temperature in August 2025 was 66°F. The lowest night temperature was 30°F. The average values for day and night temperatures during August were 58.3°F и 40.9°F respectivly.

The average sea surface temperature in August 2025 for Girdwood was 53.1°F. The maximum and minimum values were 50.0°F and 56.6°F respectively.

Most of the days in August are gloomy but you can also expect sunny days.

Precipitation total in August for Girdwood is 2.4 in.

The average wind speed in August is 5.2 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Girdwood in August is 4.3 hours.