Seward, Alaska sits on the northern most edge of a temperate rainforest, averaging 90" of precipitation a year. You can expect your visit to have a combination of sunny and rainy days. In our experience late May into early July tend to be the driest with an increase in rain beginning in mid-July. August is a bit rainier and September usually marks the beginning of fall in Seward. However, none of these rules are hard and fast.
Be sure to pack good, high-quality rain jackets and pants. Don't skimp. Inexpensive rain gear won't cut it if we have a good rainy stretch. Also, pack layers. We recommend wool or synthetic layers, avoiding cotton which does not retain its warmth when it is wet.
With the right layers, and a little proper planning any activity in Seward is great fun rain or shine! Would you like more advice about packing for your Alaska trip? Just ask!