Yes

you do need a jacket based on the weather in Thessaloniki, Greece 1 second ago

Why? Because it's so windy, you’re practically horizontal just trying to walk!
78°F25°C & Windy

Wind is 15 mph24 km/h from the North, gusting to 29 mph47 km/h
September 17
1pm76°F25°C14 mph23 km/h NorthMostly Clear
2pm74°F23°C13 mph21 km/h NorthClear
3pm72°F22°C12 mph19 km/h NorthClear
4pm70°F21°C10 mph17 km/h NorthMostly Clear
5pm68°F20°C10 mph16 km/h NorthMostly Clear
6pm67°F20°C11 mph17 km/h NorthMostly Clear
7pm66°F19°C11 mph18 km/h NorthMostly Clear
8pm65°F18°C11 mph18 km/h NorthClear
9pm63°F17°C11 mph18 km/h NorthClear
10pm62°F17°C11 mph18 km/h NorthClear
11pm61°F16°C10 mph17 km/h NorthClear
September 18
12am60°F16°C10 mph16 km/h NorthClear
DateLowHighWindDayNight
September 1667°F20°C84°F29°C7 mph12 km/h from NorthMostly ClearClear
September 1760°F16°C79°F26°C9 mph14 km/h from NorthClearClear
September 1857°F14°C80°F27°C4 mph7 km/h from NorthwestClearClear
September 1958°F15°C81°F27°C4 mph7 km/h from WestClearClear
September 2060°F16°C83°F28°C4 mph6 km/h from SouthwestClearClear
September 2161°F16°C83°F28°C5 mph8 km/h from SouthwestClearClear
September 2262°F17°C84°F29°C5 mph7 km/h from SouthwestClearClear

No

Low of 60°F16°C, High of 79°F26°C
Wind: 9 mph14 km/h
Precipitation: None

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