Summer Weather Continues Briefly Before Weekend Showers

The weather will continue to feel like summer today, with temperatures rising slightly and reaching up to 33°C. However, starting tomorrow, Thursday, temperatures will gradually drop, and forecasters expect showers over the weekend.

Meteorologist Klearchos Marousakis referred in a post to the “Rex Block” weather pattern and explained how it creates an explosively unstable atmosphere, often leading to extreme weather.

“The letter Y depicts the extended anticyclone stretching toward northern Europe. The letter X represents the low-pressure system blocked by this anticyclone, forcing it to remain over the same geographical area for days.
On one side, the anticyclone pushes colder air from northern Europe into the low, while on the other side the low interacts with warm sea regions. This interaction produces an explosively unstable atmosphere, resulting in extreme weather.
Our study already shows a significant chance this atmospheric circulation will affect our country. We should be prepared for dangerous conditions.”

Meanwhile, Theodoros Kolydas struck a more cautious tone, noting that not all regions—particularly in Eastern Greece—will experience the same instability.

“We had mentioned a few days ago that rains, although delayed, will eventually arrive. Still, we should ‘keep a small basket’ because of the predicted circulation pattern (Rex Block).
Unlike the familiar Omega Block, the Rex Block can sustain a depression in place for days, leading to prolonged effects. This seems to be occurring mainly over Italy. If the low were a little further east, we’d be having much more activity here.
But don’t expect all areas to benefit from this system, especially in Eastern Greece.”

Chilly Start in Northern Greece

On Tuesday morning, temperatures dropped to just 2°C at the weather station in Mavrolithari, Fokida. Ochyros Nefrokopi and Neapolis Kozani both recorded lows of 4.4°C. According to the National Observatory of Athens (meteo.gr), eight stations recorded the coldest minimums on the morning of September 23.

Η ΜΕΤΕΩΡΟΛΟΓΙΑ ΜΕ ΑΠΛΑ ΛΟΓΙΑ
✅Πριν από λίγες ημέρες είχαμε μιλήσει ότι οι βροχές παρότι αργούν θα έρθουν, αλλά θα πρέπει να κρατάμε μάλλον "μικρό καλάθι" , λόγω της προβλεπόμενης ατμοσφαιρικής κυκλοφορίας ( Rex Block) ,
✅Η μεγάλη διαφορά αυτού του block σε σχέση με το γνωστό… pic.twitter.com/NhqHs7e0ek

— Theodoros Kolydas (@KolydasT) September 23, 2025

Today’s Forecast

• General conditions: Mostly clear, with clouds building at noon and in the afternoon over the mainland and Crete. Localized showers are possible in mountainous mainland areas and southern Chania. Evening and morning visibility may be limited in places.
• Temperatures:
  • Northern Greece: 14–31°C (Western Macedonia: 11–28°C)
  • Epirus: 14–29°C
  • Thessaly: 14–33°C
  • Ionian Islands: 17–28°C
  • Sterea & Peloponnese: 17–31°C
  • Aegean Islands: 16–27°C (Rhodes: 22–28°C)
  • Crete: 13–29°C
• Winds: Westerly in the west and northwesterly in the east, 3–5 Beaufort.

Attica: Sunshine, with northwest winds turning southerly in the afternoon (2–4 Beaufort). Temperatures: 17–30°C.
Thessaloniki: Mostly clear, light variable winds (2–4 Beaufort). Temperatures: 14–29°C.

Outlook

Thursday, September 25
Clear in the morning, with clouds developing by midday in northern mainland areas and later in other mountain regions. Local rain is expected, with isolated thunderstorms in eastern Macedonia. Local morning showers are possible in the Ionian. Visibility is limited in the west.

• Winds: Northerly 3–5 Beaufort, locally 6 in the Aegean.
• Temperatures: Slightly lower in the north, 28–30°C generally, up to 31°C inland, 27°C in the Sporades/Cyclades, and 28–29°C in Crete.

Friday, September 26
Clouds with local showers in eastern mainland, Evia, the Cyclades, and Crete until afternoon; clearer elsewhere, though showers may develop in the west later in the day.

• Winds: Northerly 3–4 Beaufort in the west, 4–6 in the east, 6–7 in the Aegean.
• Temperatures: Dropping further, especially in the east.

Saturday, September 27
Showers and storms in the Ionian from morning, spreading to the western mainland later. Elsewhere, partly cloudy with clearer skies in southern regions.

• Winds: South-southeast 4–5 Beaufort in the west; northerly 4–6 in the east, up to 7 in the Aegean.
• Temperatures: Falling across the country.

Sunday, September 28
Widespread cloud cover with showers and occasional storms, starting in the Ionian and western mainland, then moving east. Crete and the Dodecanese will see lighter cloud cover and only a few showers.

• Winds: Southerly in the west, northerly in the east, 4–6 Beaufort, locally up to 7 in the Aegean.
• Temperatures: Continuing to drop.