The National Weather Service upgraded its previous Extraordinary Weather Advisory to an Extraordinary Hazardous Weather Advisory at noon on Thursday, July 24, due to the persistence and intensification of extremely high temperatures across the country.

Temperatures are expected to remain at dangerously high levels through the weekend, with some areas exceeding 44°C. The heatwave is forecast to ease only in northwestern Greece by Sunday afternoon (July 27), with a more general decrease in temperatures expected from Monday (July 28) across most regions.

Key Concerns:

• High minimum temperatures, particularly in urban areas, are forecast to remain around 28°C to 29°C, offering little nighttime relief.

• Strong northerly winds, reaching up to 6 to 7 Beaufort, are expected from Friday afternoon (July 25) and into Saturday (July 26), especially in the Aegean Sea.

Detailed Forecast Through Sunday (27/07/2025):

Thursday, July 24

• Mainland: 39–41°C, locally up to 42–43°C in Thessaly, eastern Sterea, and eastern Peloponnese.

• Athens: 41–42°C

• Thessaloniki: 39–40°C

• Eastern Aegean & Dodecanese: 39–41°C

• Ionian Islands & Crete: 37–39°C

Friday, July 25

• Mainland: 40–42°C, reaching 43–44°C in western regions.

• Athens: 41–42°C

• Thessaloniki: 38–39°C

• Eastern Aegean & Dodecanese: 38–40°C

• Ionian Islands & Southern Crete: 39–41°C

Saturday, July 26

• Mainland: 40–41°C, locally up to 42°C and 43–44°C in the west.

• Athens: 41–42°C

• Thessaloniki: 38–39°C

• Eastern Aegean & Dodecanese: 38–40°C

• Ionian Islands & Southern Crete: 38–40°C

Sunday, July 27

• Mainland: 38–40°C, locally 41°C in eastern regions.

• Athens: 40–41°C

• Thessaloniki: 37–38°C

• Eastern Aegean & Dodecanese: 36–38°C

• Ionian Islands & Crete: 35–37°C

Weather Conditions

Skies will remain mostly clear nationwide, with some cloud development in mountainous areas during midday and afternoon hours. Northerly winds will prevail at 3–5 Beaufort on land and 6–7 Beaufort in the Aegean Sea from Friday onward. Despite the intense heat, no significant change in weather patterns is anticipated before Sunday evening.

Public Advisory

Authorities warn of extreme heat stress, especially in central and northern Greece, as well as the islands of the eastern Aegean. The prolonged duration of the heatwave increases the risk to public health and infrastructure. Citizens are advised to:

• Stay hydrated and avoid direct sunlight.

• Refrain from strenuous outdoor activities during peak hours.

• Check on vulnerable populations such as the elderly and infants.

  >Related articles

  Weather: Mild first ten days of March with temperatures above normal levels

  Weather: High-pressure system brings sunshine and mild conditions in the first week of March

  Contrasting weather ahead: Winter conditions in the Aegean – Spring-like temperatures in the Ionian

• Follow updates from the Civil Protection Agency and National Meteorological Service.

This latest advisory emphasizes the seriousness of the heatwave affecting Greece, with Friday expected to be the peak of the extreme temperatures. A live map of the heatwave’s progress is available through official meteorological platforms.