Yes

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

Why? Because it's on the windy side!
64°F18°C & Cloudy

Wind is 12 mph19 km/h from the Northeast, gusting to 23 mph37 km/h
November 5
1pm63°F17°C13 mph20 km/h NortheastCloudy
2pm62°F17°C13 mph20 km/h NortheastCloudy
3pm61°F16°C13 mph21 km/h NortheastCloudy
4pm61°F16°C12 mph20 km/h NortheastCloudy
5pm60°F16°C12 mph19 km/h NortheastCloudy
6pm60°F16°C12 mph19 km/h NortheastCloudy
7pm60°F16°C11 mph18 km/h NortheastCloudy
8pm60°F15°C11 mph17 km/h NortheastMostly Cloudy
9pm59°F15°C10 mph16 km/h NortheastMostly Cloudy
10pm59°F15°C10 mph16 km/h NortheastCloudy
11pm59°F15°C10 mph16 km/h NortheastCloudy
November 6
12am59°F15°C10 mph16 km/h NortheastCloudy
DateLowHighWindDayNight
November 459°F15°C64°F18°C10 mph17 km/h from NortheastMostly CloudyCloudy
November 559°F15°C65°F18°C11 mph17 km/h from NortheastCloudyMostly Cloudy
November 659°F15°C66°F19°C5 mph8 km/h from NortheastPartly CloudyMostly Cloudy
November 757°F14°C67°F20°C3 mph5 km/h from EastMostly CloudyPartly Cloudy
November 856°F13°C68°F20°C3 mph5 km/h from SouthPartly CloudyPartly Cloudy
November 959°F15°C69°F21°C4 mph6 km/h from SouthPartly CloudyMostly Cloudy
November 1057°F14°C64°F18°C6 mph10 km/h from WestRainRain

Yes

Low of 58°F15°C, High of 65°F19°C
Wind: 11 mph17 km/h
Precipitation: None

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