Planning for the weather is a good way to make your trip to Dutch Harbor relaxing and enjoyable, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 9°C, while the coldest months are January and March, with an average of 1°C. The snowiest months in Dutch Harbor are March, December, February and January, with each month seeing an average of 56 cm of snowfall.