The flight takes slightly less than an hour, so if you are staying more than about 3 days, you will save time and money this way. There are several restaurants and two bars in Seldovia. Ask for recommendations when you arrive. A warm day would reach mid 60's to 70. It can also be 50 degrees and rainy in the summer.
Layers are always safe.
You cannot be too casual, and please leave your highheels and dress shoes at home or in your car. If you did not bring shorts, you would not be sorry. Although, we can have warm days where you may want a pair. Although many establishments take credit cards now. A. Fantasy North Charters , located on Main street, has processing and will vacuum seal, flash freeze, store, and ship your fish for you.