Temperatures will rise in the coming days, with the heatwave peaking on Friday, according to meteorologists. Heatwave conditions will prevail mainly in mainland areas, with temperatures reaching 40 to 41°C in typically hot parts of the country.

Ξεκινά τριήμερο ζέστης από την Τετάρτη με κορύφωση την Παρασκευή . Αναλυτικά στο κεντρικό Δελτίο Ειδήσεων του @Starchannelnew1 pic.twitter.com/vWso7babTC

— Theodoros Kolydas (@KolydasT) June 23, 2025

As Theodoros Kolydas notes in a post: “A three-day heatwave starts on Wednesday, peaking on Friday.”

Tsatrafyllias warns of very high fire risk
“A devil’s week with a very high risk of fires,” warns meteorologist Giorgos Tsatrafyllias from Alpha TV. He states that fire-weather conditions will become even more adverse in the coming days, as after the heatwave (Wednesday–Friday), gale-force north winds will follow (Saturday–Sunday).

In a previous post, Tsatrafyllias mentioned the seven regions of the country that will be most affected by the heatwave, where temperatures will rise dangerously:

• Thessaly
• Kilkis
• Serres
• Peloponnese
• Boeotia
• Aetolia-Acarnania
• Attica

Express heatwave approaching – What Kallianos says
Temperatures will start rising gradually from today (June 24, 2025), reaching up to 37°C. On Wednesday, it will get even hotter, according to Giannis Kallianos in a social media post about the coming heatwave.

His forecast indicates that hot air masses from North Africa will cover the entire Mediterranean, leading to a heatwave lasting 3 to 4 days.

Predicting temperatures in major Greek cities, he notes that Attica will scorch at 40°C on Friday, while Larissa will hit 42°C.

Indicative temperatures:
Attica

• Tue: 36°C
• Wed: 37-38°C
• Thu: 38-39°C
• Fri: 39-40°C

Thessaloniki

• Tue: 34°C
• Wed: 37°C
• Thu: 38-39°C
• Fri: 37-38°C

Patras

• Tue: 33°C
• Wed: 35°C
• Thu: 37-38°C
• Fri: 37-38°C

Heraklion

• Tue: 31°C
• Wed: 33°C
• Thu: 36°C
• Fri: 36°C

Larissa

• Tue: 36-37°C
• Wed: 38-39°C
• Thu: 40-41°C
• Fri: 41-42°C

Today’s weather
Clear skies are expected, with some local cloud development at noon and in the afternoon, mainly in mountainous mainland areas.

Temperatures:

• Western Macedonia: 13-31°C
• Rest of Macedonia, Thrace, Thessaly: 19-36°C
• Epirus: 17-33°C
• Central Greece, Peloponnese: 16-35°C
• Ionian islands: 18-34°C
• North & East Aegean islands: 17-36°C
• Cyclades: 19-33°C
• Dodecanese: 16-32°C
• Crete: 17-33°C

Winds:

• North Aegean: N 2-4 Beaufort
• Thermaikos & Sporades: Variable up to 3 Beaufort by midday
• Central Aegean: N 2-4 Beaufort
• South Aegean: Initially N 3-5, shifting to W 2-4 Beaufort
• Ionian: NW 2-4 Beaufort

Attica: Clear skies, N winds 2-4 Beaufort, variable midday-afternoon up to 3 Beaufort, 23-35°C
Thessaloniki: Clear skies, variable winds up to 3 Beaufort, 24-34°C

Wednesday, June 25 weather
Generally clear. Temporary clouds over mountainous Macedonia and Epirus in the afternoon.
N winds 3-5, up to 6 Beaufort in the eastern Aegean.
Temperature up to 37-39°C inland, 35-37°C Ionian/eastern Aegean/south Crete, 31-33°C other islands.

Thursday, June 26 weather
Generally clear. Some local clouds in mainland mountains in the afternoon.
N winds 3-5, locally 6 Beaufort central/southern Aegean.
Temperatures slightly higher, reaching very high levels.

Friday, June 27 weather
Generally clear. Afternoon clouds inland, with possible local showers or storms in central/northern mountains.
N winds 3-5, up to 6 Beaufort in the seas.
Temperatures remain high for the season.

Saturday, June 28 weather
Generally clear.
N winds 4-5, 6-7 Beaufort at sea.
Temperatures drop by 2-3°C.