Yes

you do need a jacket based on the weather in Baku, Azerbaijan 1 second ago

Why? Because it's not very warm out.
58°F14°C & Mostly Clear

Wind is 14 mph23 km/h from the N, gusting to 27 mph43 km/h
April 19
11pm59°F15°C15 mph24 km/h NMostly Clear
April 20
12am63°F17°C15 mph24 km/h NClear
1am67°F19°C15 mph25 km/h NWindy
2am70°F21°C16 mph26 km/h NWindy
3am73°F23°C16 mph25 km/h NWindy
4am74°F24°C15 mph23 km/h NClear
5am75°F24°C13 mph22 km/h NClear
6am76°F25°C12 mph19 km/h NClear
7am77°F25°C10 mph17 km/h NClear
8am76°F25°C9 mph14 km/h NClear
9am75°F24°C7 mph11 km/h NEPartly Cloudy
10am73°F23°C6 mph9 km/h NEMostly Cloudy
DateLowHighWindDayNight
April 1958°F14°C77°F25°C12 mph19 km/h from NMostly ClearMostly Clear
April 2056°F14°C76°F24°C12 mph20 km/h from SClearPartly Cloudy
April 2158°F14°C70°F21°C21 mph33 km/h from NWindyMostly Clear
April 2260°F15°C75°F24°C16 mph25 km/h from NWindyMostly Clear
April 2357°F14°C73°F23°C11 mph17 km/h from SMostly ClearMostly Clear
April 2456°F13°C73°F23°C13 mph21 km/h from SClearMostly Clear
April 2557°F14°C75°F24°C11 mph18 km/h from SMostly ClearPartly Cloudy

Yes

Low of 56°F14°C, High of 76°F25°C
Wind: 12 mph20 km/h
Precipitation: None

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