The weather outlook across Greece is set for a dramatic shift starting tomorrow, Friday, 24 July 2026. Following an intense heatwave, a powerful cold front will trigger widespread severe thunderstorms, strong gusts (known locally as bourinies), frequent lightning, and localized hail — prompting emergency warnings from the Hellenic National Meteorological Service (EMY).
Red and Orange Warnings Issued Nationwide
EMY has issued an urgent weather bulletin forecasting deteriorating conditions from Friday afternoon through Saturday midday — with some areas experiencing autumn-like weather in midsummer. The most intense activity is expected over central and eastern mainland Greece, as well as several island groups.
A red warning — the highest level — is in effect for parts of the Sporades and northern and central Evia, as well as coastal and marine zones of eastern Thessaly (Larissa and Magnesia). An orange warning covers much of Central Macedonia (Pieria, Imathia, Chalkidiki, and Thessaloniki), eastern Sterea Ellada — including Attica — and northeastern Aegean islands (Lemnos, Thasos, Samothrace).
Timeline and Regional Outlook
Friday, 24 July:
• Central Macedonia: From late morning until late evening.
• Eastern Thessaly: From noon until late night — red warning for coastal and marine areas.
• Sporades and Evia (central/northern): From noon — red warning.
• Eastern Sterea Ellada & Attica: From afternoon until late evening — orange warning.
• Northeastern Aegean islands: From late evening — orange warning.
Saturday, 25 July:
• Sporades: Until early morning — red warning.
• Evia (central/northern): Until midday — red warning.
• Northeastern Aegean islands: Until early morning — orange warning.
• Magnesia (eastern coastal/marine zones): Until early morning — orange warning.
Authorities have placed emergency response mechanisms on high alert, particularly in red-warning zones where flash flooding, downed trees, and power outages are possible. Residents are advised to avoid unnecessary travel during peak storm hours and stay informed via official EMY updates.