Yes

you do need a jacket based on the weather in Holborn Viaduct, London EC1A 2BN, UK 1 second ago

Why? Because it's cool. Pleasantly cool, but cool and it's really really huffing out there!
58°F14°C & Windy

Wind is 15 mph24 km/h from the South, gusting to 34 mph55 km/h
November 1
12am58°F14°C15 mph25 km/h SouthDrizzle
1am58°F14°C16 mph26 km/h SouthDrizzle
2am57°F14°C15 mph24 km/h SouthRain
3am56°F13°C15 mph24 km/h SouthwestRain
4am55°F13°C13 mph21 km/h SouthwestRain
5am54°F12°C12 mph20 km/h SouthwestDrizzle
6am54°F12°C11 mph18 km/h SouthwestCloudy
7am53°F12°C11 mph17 km/h SouthwestCloudy
8am53°F12°C10 mph16 km/h SouthwestMostly Cloudy
9am54°F12°C11 mph18 km/h SouthwestMostly Clear
10am55°F13°C13 mph20 km/h SouthwestMostly Clear
11am56°F13°C14 mph22 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
October 3156°F13°C60°F16°C8 mph13 km/h from SouthDrizzleRain
November 147°F8°C58°F14°C11 mph18 km/h from SouthwestPartly CloudyRain
November 245°F7°C52°F11°C8 mph13 km/h from WestRainMostly Cloudy
November 346°F8°C60°F16°C13 mph21 km/h from SouthwestCloudyCloudy
November 454°F12°C58°F15°C11 mph18 km/h from SouthDrizzleDrizzle
November 555°F13°C61°F16°C10 mph17 km/h from SouthDrizzleDrizzle
November 650°F10°C58°F14°C10 mph16 km/h from SouthwestPartly CloudyPartly Cloudy

Yes

Low of 47°F9°C, High of 58°F15°C
Wind: 11 mph18 km/h
Precipitation: 29% rain

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