Yes

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

Why? Because looks like it's raining!
61°F16°C & Rain

Wind is 4 mph6 km/h from the Northwest, gusting to 8 mph13 km/h
October 25
4am61°F16°C4 mph6 km/h NorthRain
5am62°F16°C4 mph7 km/h NortheastDrizzle
6am62°F17°C4 mph7 km/h NortheastDrizzle
7am63°F17°C5 mph8 km/h NortheastDrizzle
8am64°F18°C7 mph11 km/h NortheastCloudy
9am64°F18°C8 mph13 km/h NortheastCloudy
10am64°F18°C9 mph15 km/h NortheastCloudy
11am64°F18°C10 mph16 km/h NortheastCloudy
12pm63°F17°C10 mph15 km/h NortheastCloudy
1pm63°F17°C9 mph14 km/h NortheastCloudy
2pm63°F17°C8 mph12 km/h NortheastCloudy
3pm62°F17°C7 mph11 km/h NortheastMostly Cloudy
DateLowHighWindDayNight
October 2458°F14°C64°F18°C7 mph11 km/h from NortheastRainPartly Cloudy
October 2557°F14°C69°F20°C7 mph11 km/h from SouthPartly CloudyPartly Cloudy
October 2658°F15°C72°F22°C14 mph23 km/h from SouthwestRainRain
October 2755°F13°C68°F20°C7 mph11 km/h from SouthwestDrizzleDrizzle
October 2851°F11°C61°F16°C4 mph7 km/h from NorthwestClearMostly Clear
October 2950°F10°C64°F18°C4 mph6 km/h from SoutheastMostly ClearClear
October 3053°F12°C64°F18°C3 mph5 km/h from SouthMostly ClearPartly Cloudy

Yes

Low of 57°F14°C, High of 69°F21°C
Wind: 7 mph11 km/h
Precipitation: None

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