Yes

you do need a jacket based on the weather in London, UK 6 minutes ago

Why? Because it's not very warm out and it's on the windy side!
56°F13°C & Mostly Clear

Wind is 9 mph14 km/h from the Southwest, gusting to 20 mph32 km/h
September 10
11pm55°F13°C9 mph15 km/h SouthwestPartly Cloudy
September 11
12am55°F13°C9 mph14 km/h SouthwestMostly Clear
1am54°F12°C8 mph13 km/h SouthwestMostly Cloudy
2am55°F13°C8 mph13 km/h SouthwestPartly Cloudy
3am56°F13°C9 mph15 km/h SouthwestMostly Clear
4am58°F15°C10 mph17 km/h SouthwestPartly Cloudy
5am60°F16°C12 mph19 km/h SouthwestPartly Cloudy
6am62°F17°C12 mph20 km/h SouthwestPartly Cloudy
7am64°F18°C13 mph20 km/h SouthwestMostly Clear
8am64°F18°C14 mph22 km/h SouthwestPartly Cloudy
9am64°F18°C14 mph22 km/h SouthwestMostly Cloudy
10am64°F18°C14 mph23 km/h SouthwestRain
DateLowHighWindDayNight
September 1054°F12°C65°F18°C12 mph20 km/h from SouthwestRainMostly Clear
September 1152°F11°C65°F18°C11 mph18 km/h from SouthwestDrizzleDrizzle
September 1253°F12°C64°F18°C10 mph16 km/h from SouthwestDrizzlePartly Cloudy
September 1351°F10°C65°F19°C11 mph18 km/h from SouthRainThunderstorms
September 1456°F13°C64°F18°C18 mph29 km/h from SouthwestDrizzlePartly Cloudy
September 1554°F12°C63°F17°C12 mph20 km/h from WestMostly CloudyPartly Cloudy
September 1651°F10°C66°F19°C11 mph18 km/h from SouthwestDrizzleMostly Cloudy

Yes

Low of 52°F11°C, High of 64°F18°C
Wind: 11 mph18 km/h
Precipitation: 35% rain

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