Yes

you do need a jacket based on the weather in London, UK 11 minutes ago

Why? Because sorry, it's too cool for just a hoodie!
58°F14°C & Mostly Clear

Wind is 5 mph8 km/h from the Southwest, gusting to 12 mph20 km/h
September 8
1am57°F14°C6 mph9 km/h SouthwestMostly Clear
2am57°F14°C5 mph9 km/h SouthwestMostly Clear
3am58°F14°C6 mph10 km/h SouthwestMostly Clear
4am60°F15°C7 mph11 km/h SouthwestMostly Clear
5am62°F17°C7 mph11 km/h SouthwestMostly Clear
6am64°F18°C8 mph13 km/h SouthwestMostly Clear
7am66°F19°C9 mph14 km/h SouthwestMostly Clear
8am68°F20°C9 mph14 km/h SouthwestPartly Cloudy
9am69°F20°C9 mph14 km/h SouthwestPartly Cloudy
10am69°F21°C9 mph14 km/h SouthwestPartly Cloudy
11am69°F21°C9 mph14 km/h SouthwestPartly Cloudy
12pm69°F20°C9 mph14 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 757°F14°C69°F21°C8 mph13 km/h from SouthwestMostly ClearMostly Clear
September 853°F12°C68°F20°C6 mph10 km/h from SouthPartly CloudyMostly Cloudy
September 956°F13°C66°F19°C10 mph16 km/h from SouthDrizzleDrizzle
September 1053°F12°C65°F18°C12 mph19 km/h from SouthwestDrizzleDrizzle
September 1150°F10°C64°F18°C11 mph17 km/h from SouthwestDrizzlePartly Cloudy
September 1250°F10°C62°F17°C10 mph17 km/h from SouthwestRainDrizzle
September 1354°F12°C65°F18°C10 mph16 km/h from SouthRainRain

Yes

Low of 53°F12°C, High of 68°F20°C
Wind: 6 mph10 km/h
Precipitation: 14% rain

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