The High Coast is at its best from late June to mid-August. The days are very long — at midsummer the sun barely sets — the rocks are warm enough to swim from, and the fishing harbours are open for business. July is the warmest and busiest month.
September is quieter and the autumn colours in the forested hills are beautiful. From October to April most facilities are closed, the ferries to Högbonden don't run, and the daylight is brief. If you come in winter, come for the snow and the silence, not for the sights.