ČHMÚ is a free weather application developed by OKsystem a.s. for Android users. The app provides information on weather conditions, rainfall estimates, air quality, and water levels across the Czech Republic. Users can view data from multiple weather stations and access detailed information on temperature, precipitation, wind speed and direction, cloud cover, relative humidity, snow cover, and weather conditions. The app also offers a range of maps, including a UV index map, a map of water levels, and a map of air quality. Users can set notifications for flood levels and monitor their own water level limits. Overall, ČHMÚ is a comprehensive weather app that provides a wealth of information for those living in the Czech Republic.