No

you don't need a jacket based on the weather in London W6 9AE, UK 1 second ago

65°F18°C & Mostly Cloudy

Wind is 7 mph11 km/h from the South, gusting to 16 mph25 km/h
September 9
1pm65°F18°C7 mph12 km/h SouthMostly Cloudy
2pm64°F18°C6 mph10 km/h SouthMostly Cloudy
3pm62°F17°C6 mph9 km/h SouthMostly Cloudy
4pm60°F16°C6 mph9 km/h SoutheastMostly Cloudy
5pm59°F15°C6 mph9 km/h SoutheastPartly Cloudy
6pm59°F15°C6 mph9 km/h SoutheastMostly Cloudy
7pm58°F15°C6 mph10 km/h SoutheastMostly Cloudy
8pm58°F14°C7 mph11 km/h SoutheastMostly Cloudy
9pm58°F14°C6 mph10 km/h SoutheastMostly Cloudy
10pm57°F14°C6 mph9 km/h SoutheastMostly Cloudy
11pm57°F14°C6 mph9 km/h SoutheastCloudy
September 10
12am57°F14°C6 mph10 km/h SoutheastCloudy
DateLowHighWindDayNight
September 850°F10°C70°F21°C5 mph9 km/h from SouthPartly CloudyMostly Cloudy
September 957°F14°C65°F18°C9 mph15 km/h from SouthDrizzleDrizzle
September 1054°F12°C65°F18°C11 mph18 km/h from SouthwestDrizzleMostly Clear
September 1151°F10°C64°F18°C11 mph18 km/h from SouthwestPartly CloudyRain
September 1252°F11°C64°F18°C10 mph16 km/h from SouthwestRainRain
September 1353°F12°C67°F19°C12 mph20 km/h from SouthRainDrizzle
September 1455°F13°C66°F19°C15 mph24 km/h from SouthwestWindyMostly Clear

Yes

Low of 57°F14°C, High of 64°F18°C
Wind: 9 mph15 km/h
Precipitation: 73% rain

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