A wave of severe weather moving in from the Balkans is set to disrupt conditions across Greece starting early Wednesday, bringing rain, thunderstorms, and a noticeable temperature drop, according to meteorologist Klearchos Marousakis.
Cold air masses descending from the northern Balkans will trigger increasingly unstable conditions, initially affecting northern Greece before spreading southward through the rest of the country. The weather system is expected to reach even the southernmost regions by Friday.
Storms intensify from north to south
Rain and thunderstorms are forecast to begin in northern Greece within the next few hours, gradually moving into central and western regions and eventually reaching the southern Aegean. Weather phenomena are expected to intensify during midday and afternoon hours, with the potential for hail and strong lightning activity.
From Thessaly northward, conditions will take on an autumn-like feel, with thickening cloud cover across Epirus, Macedonia, Thrace, and the northern Aegean leading to heavy showers and storms.
In contrast, southern areas will initially experience milder, spring-like weather with limited cloud cover. However, shifting westerly winds—reaching 5 to 6 Beaufort and up to 7 Beaufort near the Kythira Sea—will play a key role in the changing conditions. These winds are also expected to temporarily push temperatures higher in eastern mainland areas, with highs reaching 27°C.
Impact on major cities
In Athens, weather conditions will remain mostly favorable, with sunshine dominating. However, there is a chance of rain on Wednesday and Thursday. Temperatures are expected to reach up to 26°C, particularly in eastern and northwestern parts of the region.
In Thessaloniki, rain showers and storms are expected from midday into the afternoon. The “Vardaris” northerly wind will strengthen overnight, keeping temperatures lower, with highs not expected to exceed 22°C to 23°C.
Outlook through the week
On Wednesday, the cold air mass will continue its southward movement, bringing intense rain and thunderstorms from the Peloponnese northward, especially during the afternoon.
By Thursday, the weather system will shift further south, affecting central, eastern, and southern parts of the Aegean Sea.
Conditions will begin to improve on Friday from north to south. However, a secondary disturbance in southern maritime areas may trigger renewed instability in the southern and southeastern Aegean.
Temperatures are expected to drop significantly from Thursday into Friday, falling from around 26°C to between 18°C and 22°C.
By Saturday, the unstable weather will subside, with conditions gradually returning to a more typical spring pattern across most of Greece. Remaining instability will be limited mainly to the eastern Aegean, as temperatures begin to rise again nationwide.
