Greece is bracing for deteriorating weather conditions beginning this afternoon, with heavy rains expected in the eastern regions and significant precipitation in Thessaly, Euboea, and the Sporades. The rainfall will intensify through Saturday, while temperatures will drop markedly. In Athens, expect rain and possible thunderstorms today, with clearer skies on Sunday. Thessaloniki will also face rainy weather today and tomorrow, with temperatures ranging from 12-20 degrees Celsius across the country. Snow is forecasted for mountainous areas in western Macedonia later this evening.