Yes

you do need a jacket based on the weather in İstanbul, Türkiye 1 second ago

Why? Because it's pretty chilly!
54°F12°C & Mostly Clear

Wind is 6 mph10 km/h from the Southeast, gusting to 16 mph26 km/h
December 23
7am55°F13°C6 mph10 km/h SoutheastMostly Clear
8am55°F13°C5 mph9 km/h SoutheastMostly Clear
9am54°F12°C5 mph8 km/h SoutheastMostly Clear
10am53°F12°C5 mph8 km/h SoutheastMostly Clear
11am52°F11°C6 mph9 km/h SoutheastMostly Clear
12pm51°F10°C6 mph9 km/h SoutheastPartly Cloudy
1pm50°F10°C6 mph10 km/h SoutheastMostly Cloudy
2pm50°F10°C7 mph11 km/h SoutheastMostly Cloudy
3pm50°F10°C7 mph12 km/h SoutheastMostly Cloudy
4pm50°F10°C8 mph12 km/h SoutheastMostly Cloudy
5pm50°F10°C8 mph12 km/h SoutheastMostly Cloudy
6pm50°F10°C7 mph12 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
December 2244°F6°C55°F13°C6 mph10 km/h from SoutheastMostly ClearMostly Cloudy
December 2348°F9°C55°F13°C5 mph8 km/h from SoutheastDrizzleRain
December 2447°F8°C56°F13°C6 mph10 km/h from NortheastCloudyDrizzle
December 2547°F8°C53°F11°C13 mph21 km/h from NortheastRainDrizzle
December 2644°F7°C49°F10°C17 mph27 km/h from NorthDrizzleCloudy
December 2745°F7°C49°F9°C14 mph22 km/h from NorthCloudyCloudy
December 2843°F6°C47°F8°C12 mph19 km/h from NortheastCloudyCloudy

Yes

Low of 48°F9°C, High of 55°F13°C
Wind: 5 mph8 km/h
Precipitation: 73% rain

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