Timing: autumn instead of summer, wind in every season
The North Sea is 18 to 19 degrees in August, no more, and the wind blows on 300 days a year. July and August are the most expensive time, with traffic jams on the island road, crowded beaches in Westerland and prices that frighten nobody in Switzerland but count as a scandal in Germany. The honestly best time is mid-September to the end of October: the holidays are over, the light is clear, the dunes glow purple with heather, the water is still 16 degrees, hotels drop 30 to 50 per cent, and in the evening you sit by the fire. Autumn is also crane and migratory bird season on the mudflats, with tens of thousands resting off Keitum and Morsum. May and June are bright, fresh and empty, with the beach rose in bloom and pre-season prices. Winter is storm season: grey, wet, 3 to 6 degrees, but the Biikebrennen on 21 February, when a bonfire burns in every village and everyone eats kale afterwards, is the most Frisian festival of the year, and prices are at their lowest. High and low tide dictate the day: mudflat walks only at low tide with a guide, swimming at high tide with an eye on the flags, and the current on the west coast is dangerous. Tide tables are posted at every beach access. Sunset at the Rotes Kliff in Kampen is compulsory; come half an hour early, in summer a hundred people stand there, in October ten.