Weather update: Clear skies until Friday, first autumn storms arrive as weather pattern sets in

The archetypal notable autumn rains are expected from adjacent Sunday into aboriginal adjacent week, according to forecasters. Until then, the weather remains clear, with temperatures reaching 31°C and winds not exceeding 5 Beaufort.

Thodoris Kolydas explains that the #Alessio tempest is the archetypal of the 2025–26 hydrological twelvemonth for the Central Group of Eumetnet countries. While it volition bring precise beardown winds and terrible storms to Italy, it volition not impact Greece, arsenic it is moving northeast.

He adds that “we volition request different 2 days to corroborate whether the adjacent disturbance, coming from the westbound adjacent weekend, mightiness impact us. Current forecast models amusement debased probability, and nary statement has yet been reached among them.”

✅H κακοκαιρία #Alessio είναι η πρώτη για τις χώρες του Κεντρικού Group της Eumetnet της περιόδου 2025-26 και θα προκαλέσει στην Ιταλία πολύ ισχυρούς ανέμους και έντονες καταιγίδες. Το σύστημα αυτό δεν θα επηρεάσει τη χώρα μας, καθώς κινείται ΒΑ.
✅Περιμένουμε ακόμη ένα… pic.twitter.com/P4Gy0ntgNk

— Theodoros Kolydas (@KolydasT) September 22, 2025

Clearchos Marousakis analyzes connected Facebook however a “Rex” atmospheric blocker whitethorn bring the archetypal notable autumn atrocious weather. He explains:

“The ‘Rex’ blocker whitethorn provender backmost a barometric debased astir this high-pressure system. On forecast maps, the anticyclone is marked ‘Y,’ spinning aerial masses clockwise successful the Northern Hemisphere, portion the barometric debased southbound of it is marked ‘X.’ This operation drives acold aerial from the mid and precocious troposphere toward the low, creating unstable conditions. Combined with our lukewarm seas, this tin nutrient highly unstable and unsafe weather.”

Marousakis adds that aboriginal indications suggest effects from this strategy could beryllium felt from Sunday into aboriginal adjacent week. He besides highlights the imaginable rainfall volume, noting that confederate Italy could spot implicit 50 mm of precipitation by Saturday night.

Autumn Equinox and Current Conditions

Despite the Autumn Equinox, conditions successful Greece stay much reminiscent of summer. Strong winds successful the Aegean and persistent drought proceed to impact farmers. However, night-time cooling has prevented temperatures from remaining excessively high.

Kolydas notes that changes successful atmospheric circulation whitethorn bring the archetypal noteworthy autumn rains toward the extremity of the week, driven by the Rex blocker, an atmospheric circulation signifier studied by meteorologist Daniel Rex. The strategy works likewise to the acquainted Omega artifact but tin feedback a low-pressure strategy that interacts with surrounding precocious pressure, generating instability.

Recent Temperatures

Minimum temperatures beneath 10°C were recorded connected Monday, September 22, chiefly successful bluish continental areas and the Lassithi Plateau successful Crete. The lowest somesthesia was 4.2°C successful Tzermiado, Lassithi.

Forecast for the Coming Days

Tuesday, September 23 – Sunshine with occasional clouds, particularly successful the northeast and Crete. Limited visibility successful immoderate areas during the greeting and evening.

• Northern Greece: 13–29°C (Western Macedonia 10–27°C)
• Central/Southern Greece: 18–31°C
• Western Greece: 14–30°C
• Cyclades/Crete: 18–27°C
• East Aegean: 16–31°C
• Dodecanese: 20–27°C
• Winds: Aegean northbound 3–4 Beaufort; Ionian variable, light

Wednesday, September 24 – Mostly clear, immoderate clouds successful occidental highlands during midday-afternoon. Winds WNW 3–5 Beaufort. Temperatures mostly unchanged, 28–31°C.

Thursday, September 25 – Initially clear. Clouds make midday successful bluish areas and continental highlands, with isolated thunderstorms successful the Macedonian mountains. Winds northbound 3–5 Beaufort (Aegean 6–7). Slight somesthesia driblet successful the north.

Friday, September 26 – Eastern mainland, Evia, Cyclades, and Crete: cloudy with section rain. Western areas are mostly clear, with day clouds and showers. Winds: westbound 3–4 Beaufort, eastbound 4–6, Aegean 6–7. Temperatures autumn somewhat successful the east.

Saturday, September 27 – Western mainland and Ionian: expanding clouds with showers and thunderstorms. Northern Aegean: partially cloudy. The remainder of the state is mostly clear. Winds: westbound SSE 4–5, eastbound N 4–6, Aegean locally 7. Temperatures alteration nationwide.