Yes

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

Why? Because rain's coming down and it's cool enough your breath is visible, but your nose isn’t red yet and it's close to hurricane level winds!
48°F9°C & Rain

Wind is 25 mph40 km/h from the South, gusting to 52 mph84 km/h
January 24
1am48°F9°C25 mph41 km/h SouthRain
2am49°F9°C25 mph40 km/h SouthwestDrizzle
3am50°F10°C23 mph37 km/h SouthwestDrizzle
4am51°F10°C20 mph33 km/h SouthwestWindy
5am51°F11°C17 mph27 km/h SouthwestWindy
6am51°F11°C16 mph26 km/h SouthwestWindy
7am51°F10°C16 mph26 km/h SouthwestWindy
8am50°F10°C16 mph25 km/h SouthwestWindy
9am50°F10°C14 mph23 km/h SouthwestCloudy
10am49°F9°C12 mph20 km/h SouthwestCloudy
11am48°F9°C11 mph18 km/h SouthwestCloudy
12pm47°F8°C9 mph15 km/h SouthwestCloudy
DateLowHighWindDayNight
January 2343°F6°C51°F11°C15 mph24 km/h from SouthwestDrizzleRain
January 2435°F2°C43°F6°C5 mph8 km/h from WestRainPartly Cloudy
January 2535°F2°C48°F9°C14 mph23 km/h from SouthRainRain
January 2643°F6°C48°F9°C14 mph22 km/h from SouthwestRainDrizzle
January 2741°F5°C46°F8°C13 mph20 km/h from SouthwestDrizzleMostly Cloudy
January 2839°F4°C45°F7°C8 mph14 km/h from SoutheastRainDrizzle
January 2938°F3°C46°F8°C9 mph14 km/h from NorthPartly CloudyMostly Clear

Yes

Low of 35°F2°C, High of 43°F6°C
Wind: 5 mph8 km/h
Precipitation: 69% rain

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