Yes

you do need a jacket based on the weather in İstanbul, Türkiye 3 minutes ago

Why? Because it's fairly windy outside!
81°F27°C & Clear

Wind is 12 mph19 km/h from the Northeast, gusting to 23 mph37 km/h
July 12
6am82°F28°C13 mph21 km/h NortheastClear
7am82°F28°C14 mph22 km/h NortheastClear
8am82°F28°C14 mph23 km/h NortheastClear
9am82°F28°C15 mph23 km/h NortheastClear
10am81°F27°C15 mph23 km/h NortheastClear
11am80°F27°C14 mph23 km/h NortheastClear
12pm79°F26°C14 mph22 km/h NortheastClear
1pm77°F25°C12 mph20 km/h NortheastClear
2pm75°F24°C10 mph17 km/h NortheastClear
3pm74°F23°C9 mph15 km/h NortheastClear
4pm73°F23°C8 mph13 km/h NortheastClear
5pm72°F22°C7 mph12 km/h NortheastClear
DateLowHighWindDayNight
July 1171°F22°C82°F28°C13 mph20 km/h from NortheastClearClear
July 1269°F21°C84°F29°C13 mph21 km/h from NortheastClearClear
July 1369°F21°C84°F29°C13 mph21 km/h from NortheastClearMostly Clear
July 1471°F22°C85°F30°C13 mph21 km/h from NortheastClearClear
July 1571°F22°C87°F30°C11 mph18 km/h from NortheastClearMostly Clear
July 1670°F21°C87°F30°C8 mph12 km/h from NortheastClearClear
July 1772°F22°C85°F30°C8 mph13 km/h from NortheastClearMostly Clear

No

Low of 70°F21°C, High of 84°F29°C
Wind: 13 mph21 km/h
Precipitation: None

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