Yes

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

Why? Because the wind could blow a wig clean off your head!
64°F18°C & Partly Cloudy

Wind is 8 mph13 km/h from the Southeast, gusting to 19 mph31 km/h
September 6
11pm63°F17°C8 mph13 km/h SoutheastMostly Cloudy
September 7
12am62°F17°C6 mph10 km/h SoutheastMostly Cloudy
1am62°F16°C7 mph11 km/h SoutheastMostly Cloudy
2am62°F17°C8 mph12 km/h SoutheastMostly Cloudy
3am64°F18°C9 mph14 km/h SoutheastPartly Cloudy
4am67°F19°C9 mph14 km/h SoutheastPartly Cloudy
5am71°F21°C10 mph16 km/h SoutheastPartly Cloudy
6am74°F23°C11 mph17 km/h SoutheastMostly Cloudy
7am75°F24°C12 mph19 km/h SouthMostly Cloudy
8am76°F25°C11 mph18 km/h SouthCloudy
9am77°F25°C12 mph20 km/h SouthCloudy
10am76°F25°C12 mph20 km/h SouthCloudy
DateLowHighWindDayNight
September 662°F16°C77°F25°C11 mph17 km/h from SouthMostly CloudyPartly Cloudy
September 755°F13°C69°F20°C7 mph12 km/h from SouthwestMostly ClearMostly Clear
September 851°F10°C68°F20°C6 mph10 km/h from SouthPartly CloudyPartly Cloudy
September 955°F13°C66°F19°C10 mph16 km/h from SouthDrizzleMostly Cloudy
September 1054°F12°C63°F17°C12 mph19 km/h from SouthwestDrizzleMostly Clear
September 1150°F10°C63°F17°C11 mph18 km/h from SouthwestDrizzlePartly Cloudy
September 1248°F9°C64°F18°C10 mph15 km/h from SouthwestDrizzleDrizzle

Yes

Low of 55°F13°C, High of 69°F21°C
Wind: 7 mph12 km/h
Precipitation: 6% rain

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