Yes

you do need a jacket based on the weather in (Clapham), England, United Kingdom 1 second ago

Why? Because it's pretty chilly!
53°F12°C & Mostly Cloudy

Wind is 6 mph9 km/h from the Northeast, gusting to 14 mph22 km/h
May 10
10pm52°F11°C6 mph9 km/h NortheastPartly Cloudy
11pm52°F11°C5 mph8 km/h NortheastPartly Cloudy
May 11
12am51°F11°C5 mph8 km/h EastPartly Cloudy
1am52°F11°C6 mph9 km/h NortheastPartly Cloudy
2am54°F12°C6 mph10 km/h EastPartly Cloudy
3am57°F14°C7 mph11 km/h EastPartly Cloudy
4am62°F16°C8 mph12 km/h EastPartly Cloudy
5am65°F18°C9 mph14 km/h EastPartly Cloudy
6am69°F20°C10 mph16 km/h EastMostly Clear
7am71°F22°C11 mph17 km/h EastMostly Clear
8am72°F22°C11 mph18 km/h EastPartly Cloudy
9am73°F23°C11 mph18 km/h EastMostly Clear
DateLowHighWindDayNight
May 1051°F11°C73°F23°C9 mph15 km/h from EastMostly ClearMostly Cloudy
May 1156°F13°C72°F22°C7 mph11 km/h from SoutheastMostly CloudyMostly Clear
May 1253°F12°C72°F22°C8 mph14 km/h from EastMostly ClearClear
May 1351°F10°C72°F22°C9 mph15 km/h from NortheastMostly ClearMostly Clear
May 1448°F9°C70°F21°C9 mph15 km/h from NorthPartly CloudyMostly Clear
May 1549°F10°C71°F22°C9 mph15 km/h from NortheastClearClear
May 1649°F9°C72°F22°C6 mph10 km/h from NortheastMostly ClearMostly Clear

Yes

Low of 56°F14°C, High of 72°F22°C
Wind: 7 mph11 km/h
Precipitation: 25% rain

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