Meteorologist Panagiotis Giannopoulos reports that Greece will experience local rain and possible thunderstorms, particularly in southern coastal areas over the next few days. Showers are expected in the western, central, and southern regions, with isolated storms in southern Ionian and Aegean. Temperatures are set to rise slightly, reaching up to 20 degrees in the south. Rain is predicted for Athens and Thessaloniki, with varying temperatures and conditions forecasted through the weekend.