sunshine period. The annual average sunshine period on Sylt is 4.4 hours per day. It is due to the low relief of the shoreline that Sylt had a total of 1,899 hours of sunshine in 2005, 180 hours above the German average. Clouds cannot accumulate as quickly and are generally scattered by the constant westerly or northwesterly winds.

The annual mean temperature is 8.5 °C. The annually averaged wind speed measures 6.7 m/s (15 mph), predominantly from western directions. The annual rainfall amounts to about 650 millimetres (25½").