The week begins with increased atmospheric instability and temperatures that are high for the season.

However, from tomorrow, the weather will change abruptly, bringing an intense autumnal shift, with rain, thunderstorms and a noticeable drop in temperatures, locally reaching as much as 8 degrees.

More specifically:

For today, Monday (September 21), initially clear skies are expected. After midday, however, cloud cover will develop over the Ionian and mainland areas, bringing brief showers or rain showers, mainly in mountainous areas.

Temperatures will reach 32 to 33 degrees in mainland areas, 30 degrees in Crete and the Dodecanese, and 28 degrees in the eastern Aegean and the Ionian.

Winds over the seas will be mainly northerly, reaching up to 6 Beaufort in the Aegean and up to 5 Beaufort in the Ionian.

In Attica, there is a chance of light rain after midday. Temperatures will range from 17 to 31 degrees, while winds will be light.

In Thessaloniki, no significant rainfall is expected, although there is a chance of a few light showers around midday. Winds in the Thermaic Gulf will be light, while the maximum temperature will reach 32 degrees.

The Weather in the Coming Days

On Tuesday and Wednesday, an atmospheric disturbance moving in from the northwest will bring rain and thunderstorms, initially to the Ionian, Epirus, Macedonia and Thessaly, and gradually to Central Greece, Evia, the Sporades, the Peloponnese, the Cyclades and Crete. The phenomena will be locally strong, particularly in eastern and southern Greece.

At the same time, northerly winds over the seas will strengthen, reaching 7 Beaufort, while temperatures will drop significantly, locally by as much as 8 degrees, and will not exceed 25 to 26 degrees. During the evening hours, temperatures could even fall into single digits in mountainous areas.

On Thursday, the weather phenomena will cease across the country and temperatures will begin to rise.

Finally, according to the latest forecast data, on Friday and over the weekend, temperatures will remain close to seasonal averages, winds will strengthen, while the development of rainfall will depend on the path of the low-pressure system expected to form over the central Mediterranean. More time is needed before safer conclusions can be drawn.