Yes

you do need a jacket based on the weather in London Borough of Hackney, London, UK 1 second ago

Why? Because too cold for just a hoodie, too warm for a parka!
44°F7°C & Mostly Clear

Wind is 4 mph7 km/h from the North, gusting to 11 mph18 km/h
September 23
1am44°F7°C5 mph8 km/h NorthMostly Clear
2am45°F7°C5 mph9 km/h NorthPartly Cloudy
3am47°F8°C6 mph10 km/h NorthMostly Clear
4am50°F10°C7 mph11 km/h NorthMostly Clear
5am54°F12°C8 mph13 km/h NorthMostly Clear
6am57°F14°C9 mph14 km/h NorthMostly Clear
7am59°F15°C9 mph15 km/h NorthPartly Cloudy
8am61°F16°C10 mph16 km/h NorthMostly Cloudy
9am62°F17°C10 mph16 km/h NortheastMostly Cloudy
10am62°F17°C10 mph17 km/h NortheastMostly Cloudy
11am61°F16°C10 mph17 km/h NortheastMostly Cloudy
12pm61°F16°C10 mph15 km/h NortheastMostly Cloudy
DateLowHighWindDayNight
September 2243°F6°C62°F17°C9 mph14 km/h from NorthPartly CloudyMostly Clear
September 2348°F9°C64°F18°C9 mph15 km/h from NortheastMostly CloudyMostly Cloudy
September 2448°F9°C64°F18°C10 mph17 km/h from NortheastMostly CloudyPartly Cloudy
September 2548°F9°C60°F16°C6 mph10 km/h from EastMostly CloudyMostly Cloudy
September 2650°F10°C63°F17°C6 mph9 km/h from SouthDrizzleMostly Cloudy
September 2752°F11°C64°F18°C5 mph8 km/h from SouthDrizzleMostly Clear
September 2849°F9°C66°F19°C5 mph8 km/h from EastPartly CloudyPartly Cloudy

Yes

Low of 48°F9°C, High of 64°F18°C
Wind: 9 mph15 km/h
Precipitation: None

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