Typical German weather. Season is from March to October. A wetsuit is always necessary maybe in summertime a shorty. Water in spring an autumn from 8-13°C, summer up to 22°C. If you are really hard you can ride it all year. But during winter some ice is possible. In wintertime water is about 3-5°C cold.
Wind is pretty regular. All easterly winds (mainly in summertime) are perfect for this spot. Since it is a bay there are some possibilities to get into the water without having totally onshore winds. Sideshore NNE and SSW.
From Hamburg drive into the direction Kiel, follow signs to Eckernfoerde and finally Kappeln. From Kappeln follow the street to Flensburg. After about 10 minutes take a left in the direction Maasholm. Arrived in Maasholm follow the Harbour signs and there you are. Beach is located on the left hand side of the harbor. Parking at the harbor is 1 Euro.