Sunny skies are expected to give way to rain and thunder storms later on Tuesday and on Wednesday, according to the Hellenic National Meteorological Service, which said during an emergency bulletin on Tuesday that downpours are expected to be quite strong in parts and accompanied by a shower of hail.
Storms are forecast for the Greek mainland, as well as the central and northern Aegean, with heavy downpours and a chance of hail in the north.
Large hailstones fell in Imathia, central Macedonia, on Monday, causing damaged to crops, cars, solar panels and resulting in one person requiring stitches.
Temperatures are also expected to drop quite significantly on Tuesday and Wednesday.
Showers will hit the Greek capital on Tuesday and Wednesday afternoon and in the early evening, according to the HNMS, though hail is not expected in Athens.
Skies are expected to begin clearing up in the early hours of Thursday from west to east.