The thesis deals with the development of a web application in .NET 5 and a mobile application for the Android operating system. The applications were created for the collection and visualization of data from the weather station, which was developed in previous years within the diploma thesis of Ing. Petr Mlčák. The web application provides a REST API for collecting data from the weather station and sending data for the mobile application, it also provides a user web interface for visualizing data from the weather station and managing it. The first part describes the quantities that the weather station measures and sends to the server. The second part describes the design of a database structure for data storage. The third part of the work i...