Urban Heat Island (UHI) affects considerably human health, local economies and the environment, particularly, with regard to human health, its effect is important in over-populated regions and regions where vulnerable and high risk groups live. The LIFE ASTI project which is part-financed by LIFE programme 2014-2020, aims at developing a set of modeling systems for short-term prediction, as well as for future projection of the UHI effect, in two Mediterranean cities, namely Thessaloniki and Rome, where installed monitoring networks of ground-based weather stations already exist. In the frame of the project a web application and a mobile application, available for Android and iOS devices, were developed, in order to give high prognostic quality information. In these applications, for each pilot area, several detailed maps of meteorological variables derived from the forecast models are provided. The use of these models and applications will assist to inform citizens on subjects concerning climatic change and also on the development of urban adaptation strategies for the restriction of UHI effect.