Autumn Storms Cut Greek Temperatures by Up to 7°C

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Greece shifted into an autumn pattern from Tuesday, 22 September, with rain, thunderstorms, lightning, possible hail and a drop of about 6–7°C.

The Hellenic National Meteorological Service (EMY) issued an Emergency Weather Deterioration Bulletin. The strongest cell sat over the northwestern Aegean: Magnesia, the Sporades, Halkidiki and central and northern Evia.

Meteorologist Christina Rigou told parapolitika.gr the week would start wet. “We expect rain and thunderstorms, which will be severe in parts of the country. We will also see some localized hail and intense lightning activity, which will be concentrated mainly over sea areas.”

Storms began early in the north, especially Halkidiki, and reached the northern Aegean islands, the Sporades, central and northern Evia and eastern Thessaly, with Magnesia at the centre. Unsettled weather there was due to last into Tuesday afternoon. EMY said Magnesia’s rain could linger until early Wednesday, then ease.

Elsewhere, lighter rain was likely through the day, with brief mountain thunderstorms. Rigou said flash flooding could not be ruled out where the cells were strongest.

Temperatures

Macedonia and Thessaly were not expected to pass 24–26°C on Tuesday, after local highs near 32°C on Monday. The low 30s were likely only in the Peloponnese and Crete. From Wednesday 23 September through the week, most of the country sits around 24–26°C.

Northerlies reach about force 6 and, on the data used for the forecast, should not cause major problems.

Athens

Attica was due light showers from Tuesday morning, then brief thunderstorms over the northeast around midday. Athens was forecast near 26°C, about 6°C below Monday.

Cooler air holds through the week even after the heaviest rain fades.

Source: Parapolitika newsroom, 22 September 2026; comments from Christina Rigou; EMY emergency bulletin.

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