Meteorologist Thodoris Kolydas has shared a new weather update on social media, outlining how conditions are expected to evolve over the coming weeks. According to his latest analysis, a new experimental 15-day ensemble forecast for Athens indicates that high temperatures will persist through the first days of July, with daytime highs reaching around or slightly above 35°C (95°F). A gradual cooling trend is expected to begin after July 4–5.
As he explains, “The wind forecast indicates strengthening northerly winds over the Aegean Sea and eastern mainland Greece after July 5, signaling a strengthening of the Meltemi”—the seasonal dry northerly winds that typically blow across the Aegean during the summer. “This change acts to suppress temperatures in Athens, preventing further warming and leading to a gradual decline in daytime highs.”
Kolydas’ Full Post
The new experimental 15-day ensemble forecast for Athens clearly shows that temperatures will remain at high levels through the first days of July, with maximum temperatures hovering around or slightly above 35°C (95°F). After that, and especially after July 4–5, the trend gradually begins to change.
The most interesting element emerges when this forecast is combined with the new ensemble wind product. The wind forecast shows strengthening northerly winds over the Aegean and eastern mainland Greece after July 5, indicating a stronger Meltemi. This change suppresses temperatures in Athens by limiting any further increase and gradually lowering daytime highs.
In simple terms, the temperature ensemble points to an initially hot period, while the wind ensemble explains why temperatures do not continue climbing afterward: the strengthening Meltemi after July 5 favors lower daytime highs, particularly across eastern and coastal parts of Attica.
Forecast for Tuesday, June 30, 2026
Generally sunny weather is expected. Temporary afternoon cloud cover will develop over the mainland, bringing localized showers and possibly isolated thunderstorms to Epirus, western and central Macedonia, and mainly the mountainous areas of western Central Greece and the western Peloponnese.
Winds will blow from the north at 3–5 Beaufort, reaching locally up to 6 Beaufort over the Aegean.
Temperatures will remain largely unchanged. Highs will reach 34–36°C (93–97°F), locally 37°C (99°F) across the mainland, while the rest of the islands will see temperatures of 30–33°C (86–91°F).
Forecast for Wednesday, July 1, 2026
Generally sunny conditions will continue. Temporary afternoon clouds will develop over the mainland, bringing localized showers and possibly isolated thunderstorms in the northern mountains.
Winds will blow from the north at 3–5 Beaufort, reaching locally 6 Beaufort over the Aegean.
Temperatures will rise slightly.
Forecast for Thursday, July 2, 2026
Generally sunny weather is forecast. Temporary afternoon cloud cover over the mainland will produce localized showers and possibly isolated thunderstorms in northern Greece and mountainous areas elsewhere.
Winds will be northwesterly at 3–5 Beaufort, reaching locally 6 Beaufort over the southern Aegean.
Temperatures are not expected to change significantly.
Forecast for Friday, July 3, 2026
Generally sunny weather will prevail. Temporary afternoon clouds over the mainland will bring localized showers and isolated thunderstorms, mainly across central and northern Greece and mountainous regions elsewhere.
Winds will be northwesterly at 3–5 Beaufort, reaching locally 6 Beaufort over the seas.
Temperatures are expected to decline slightly.
