Yes

you do need a jacket based on the weather in London SW6, UK 1 second ago

Why? Because the wind makes walking forward feel like moonwalking in reverse!
60°F16°C & Mostly Clear

Wind is 12 mph19 km/h from the Southwest, gusting to 26 mph42 km/h
September 12
7am62°F17°C12 mph19 km/h SouthwestPartly Cloudy
8am63°F17°C12 mph20 km/h SouthwestPartly Cloudy
9am64°F18°C12 mph20 km/h SouthwestMostly Cloudy
10am62°F17°C14 mph22 km/h SouthwestDrizzle
11am61°F16°C12 mph19 km/h SouthwestMostly Cloudy
12pm62°F17°C12 mph19 km/h SouthwestMostly Cloudy
1pm60°F16°C11 mph17 km/h SouthwestPartly Cloudy
2pm59°F15°C9 mph15 km/h SouthwestPartly Cloudy
3pm58°F14°C8 mph13 km/h SouthwestPartly Cloudy
4pm57°F14°C7 mph11 km/h SouthwestMostly Cloudy
5pm56°F13°C7 mph11 km/h SouthwestMostly Cloudy
6pm55°F13°C7 mph12 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
September 1152°F11°C64°F18°C11 mph17 km/h from SouthwestRainDrizzle
September 1253°F12°C63°F17°C10 mph17 km/h from SouthwestDrizzlePartly Cloudy
September 1349°F9°C65°F19°C9 mph14 km/h from SouthRainDrizzle
September 1455°F13°C64°F18°C17 mph28 km/h from SouthwestWindyMostly Clear
September 1552°F11°C64°F18°C11 mph18 km/h from WestMostly CloudyDrizzle
September 1653°F12°C67°F20°C15 mph25 km/h from SouthwestDrizzlePartly Cloudy
September 1754°F12°C67°F19°C8 mph13 km/h from WestMostly CloudyMostly Cloudy

Yes

Low of 53°F12°C, High of 63°F17°C
Wind: 10 mph17 km/h
Precipitation: 60% rain

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