Wind flats are typical coastal landscape elements of the tide-less Southern Baltic Sea. These sediment areas exhibit an irregular and unpredictable pattern of emersion and flooding as a function of the prevailing wind direction and speed. Consequently, wind flats represent very specific and unique coastal habitats that, however, are ecologically poorly understood.The irregular and unpredictable water level fluctuations cause strong physico-chemical gradients which favour the development of laminated microbial mats. These micro-ecosystems accumulate organic material, enrich the sediment with nutrients and reduce erosion of sand particles.In the present study we developed a new autonomous measuring device for precise water level changes and recorded for the first time under in-situ conditions the irregular flooding events of the wind flat Bock (Zingst Peninsula, German Baltic Sea coast). The measured water level changes were compared and correlated with the closest gauging station and the prevailing wind conditions (direction, speed) to better understand the effects of hydrology and meteorology on duration and intensity of inundation. From the 12 measuring periods of over 2.5years we noted that about half of the time the wind flat was fully exposed and dry, and the other half at least wet with <1cm water levels. The strongest flooding of up to 20 and 50cm water height was a relatively rare event, which, however, depended on wind speed and direction, i.e. wind speed above 8ms −1 from north to northeast direction. The undertaken measurements on exposure and inundation intervals of this unique sedimentary ecosystem describe well the wind-driven high dynamics and strong gradients in the environmental parameters, and explain well the abundant occurrence of microbial mats in wind flats.