No

you don't need a jacket based on the weather in Katerini 601 00, Greece 1 second ago

60°F16°C & Cloudy

Wind is 4 mph6 km/h from the NE, gusting to 10 mph16 km/h
April 23
1pm60°F15°C4 mph6 km/h NEMostly Cloudy
2pm59°F15°C3 mph6 km/h NWMostly Cloudy
3pm58°F15°C3 mph6 km/h NWPartly Cloudy
4pm58°F14°C4 mph6 km/h NWPartly Cloudy
5pm57°F14°C3 mph6 km/h NWPartly Cloudy
6pm56°F14°C3 mph5 km/h NWPartly Cloudy
7pm56°F13°C3 mph5 km/h NWMostly Clear
8pm55°F13°C3 mph5 km/h NWPartly Cloudy
9pm54°F12°C3 mph4 km/h NWMostly Clear
10pm54°F12°C2 mph4 km/h NWMostly Clear
11pm53°F12°C2 mph4 km/h NWMostly Clear
April 24
12am54°F12°C2 mph4 km/h WClear
DateLowHighWindDayNight
April 2251°F10°C61°F16°C3 mph5 km/h from NERainPartly Cloudy
April 2353°F12°C71°F22°C5 mph7 km/h from EClearPartly Cloudy
April 2453°F12°C66°F19°C5 mph7 km/h from NDrizzleClear
April 2547°F8°C67°F19°C5 mph8 km/h from EMostly ClearPartly Cloudy
April 2650°F10°C68°F20°C4 mph6 km/h from EMostly CloudyMostly Clear
April 2752°F11°C74°F23°C5 mph7 km/h from SEClearClear
April 2855°F13°C75°F24°C4 mph6 km/h from EClearClear

Yes

Low of 54°F12°C, High of 71°F22°C
Wind: 5 mph7 km/h
Precipitation: None

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