Greece forecasts fair Sunday weather with mountain showers before midweek storms

Sunday conditions across Greece

Greece experiences predominantly fair weather on Sunday, 20 September 2026, accompanied by light cloud cover and localized rainfall in inland mountain ranges. Forecasts from the Hellenic National Meteorological Service (EMY) and meteo indicate that sunshine will dominate most regions throughout the morning. During midday and afternoon hours, cloud cover will thicken across mainland areas, generating brief showers and isolated thunderstorms over elevated terrain in Epirus, Macedonia, Thessaly, Central Greece, the Peloponnese, and sections of the Ionian Sea.

Wind patterns and regional temperatures

Wind directions across the country remain predominantly northerly. In western Greece and the Ionian Sea, winds blow between 2 and 4 Beaufort, with local gusts reaching 5 Beaufort. In eastern regions, winds range between 4 and 6 Beaufort, while the Aegean Sea sees stronger gusts reaching up to 7 Beaufort locally according to EMY. In northern Aegean waters, winds initially blow from north-northeasterly directions at 3 to 4 Beaufort before shifting north-northwesterly in the afternoon.

Temperatures show a slight downward trend in eastern areas while remaining typical for late September. Maximum temperatures across mainland Greece will reach between 27 and 32 degrees Celsius. EMY forecasts peak values of 32 degrees Celsius in Eastern Sterea and Evia, 31 degrees Celsius in Central Macedonia, Thessaly, Western Sterea, and Eastern Peloponnese, and 30 degrees Celsius in Western Peloponnese, the Dodecanese, and the Eastern Aegean islands. Minimum temperatures will drop to 14 degrees in Western Macedonia, 16 degrees in Thrace and Thessaly, and 17 degrees in Epirus and Central Greece. Coastal and island locations remain milder overnight, with lows of 21 degrees Celsius across the Cyclades, the Ionian Islands, and the Eastern Aegean.

Conditions in Athens and Thessaloniki

In Attica, Sunday brings sunny conditions with transient clouds. Temperatures in the capital region will range from 17 to 31 degrees Celsius according to meteo, while EMY records an expected range of 19 to 30 degrees Celsius. Northerly winds across Attica will maintain speeds between 3 and 4 Beaufort.

Thessaloniki will also see fair weather punctuated by temporary cloud cover. Light winds will blow primarily from south-southeasterly directions. Temperatures in the northern port city are forecast to fluctuate between 17 and 32 degrees Celsius according to meteo, with EMY projecting a range of 18 to 29 degrees Celsius.

Outlook for the week ahead

Monday, 21 September 2026, will continue the pattern of mostly fair weather with afternoon cloud buildup over the mainland. Mountainous areas in the west and north will experience brief showers and isolated thunderstorms, with unsettled conditions persisting overnight in northern districts. Temperatures on Monday will remain largely unchanged, reaching 27 to 30 degrees Celsius generally and 31 to 32 degrees Celsius locally on the mainland, while Aegean winds ease slightly to 6 Beaufort.

A broader weather change begins on Tuesday, 22 September 2026, bringing scattered rain, thunderstorms, and a noticeable temperature drop across Greece. Northeastern regions will see rainfall and storms that will gradually ease from midday. Elsewhere, clouds will thicken by afternoon, triggering local storms across mainland regions and the mountains of Crete. Conditions are forecast to stabilize starting Wednesday, 23 September 2026, as the system clears.