Heat wave and strong northerly winds forecast for Greece, June 20‑23 2026

A high‑pressure ridge will keep most of Greece under clear skies on Saturday, 20 June, with only occasional clouds that may thicken into local showers and brief thunderstorms in mountainous areas of the north and west. Temperatures will be typical for early summer, reaching 30‑33 °C on the Ionian islands and the mainland, while western interior valleys could peak at 35‑37 °C. Northerly breezes will dominate the Aegean, blowing from 4 to 7 bft and locally up to 8 bft, especially around the Cyclades and the Dodecanese. The same pattern will continue through Sunday and Monday, with slight increases in cloud cover and isolated rain in the central and northern highlands. Fire‑danger warnings will be issued for thirteen regions, including Attica, Argolis, Lesbos and Crete, as dry conditions combine with strong winds. By Tuesday, 23 June, the weather will remain generally sunny with only scattered clouds, while the wind will stay north‑easterly at 6‑7 bft across the Aegean. Overall, the period will feature warm, dry weather punctuated by localised rain and heightened fire risk.