Yes

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

Why? Because it's colder than cold. Water will freeze.
31°F-1°C & Clear

Wind is 3 mph5 km/h from the S, gusting to 9 mph15 km/h
December 2
2pm30°F-1°C4 mph6 km/h SClear
3pm30°F-1°C4 mph6 km/h SClear
4pm30°F-1°C4 mph6 km/h SEClear
5pm31°F-0°C5 mph7 km/h SEMostly Clear
6pm32°F0°C6 mph10 km/h SEMostly Cloudy
7pm33°F1°C6 mph10 km/h SMostly Cloudy
8pm35°F2°C7 mph11 km/h SCloudy
9pm36°F2°C8 mph12 km/h SCloudy
10pm38°F3°C8 mph13 km/h SCloudy
11pm38°F3°C9 mph14 km/h SCloudy
December 3
12am38°F3°C9 mph15 km/h SDrizzle
1am38°F4°C10 mph16 km/h SDrizzle
DateLowHighWindDayNight
December 130°F-1°C33°F1°C3 mph4 km/h from SWPartly CloudyFreezingdrizzle
December 233°F1°C46°F8°C7 mph11 km/h from SDrizzleRain
December 340°F5°C47°F8°C8 mph14 km/h from NERainDrizzle
December 437°F3°C43°F6°C11 mph17 km/h from NWCloudyPartly Cloudy
December 533°F1°C42°F6°C5 mph8 km/h from SEDrizzleDrizzle
December 639°F4°C51°F10°C12 mph20 km/h from SDrizzleDrizzle
December 746°F8°C52°F11°C7 mph11 km/h from SMostly CloudyDrizzle

Yes

Low of 34°F1°C, High of 46°F8°C
Wind: 7 mph11 km/h
Precipitation: 82% rain

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