Yes

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

Why? Because it's on the windy side!
61°F16°C & Mostly Cloudy

Wind is 10 mph16 km/h from the Southwest, gusting to 19 mph31 km/h
September 10
5pm61°F16°C10 mph16 km/h SouthwestMostly Cloudy
6pm60°F15°C11 mph18 km/h WestPartly Cloudy
7pm58°F15°C11 mph17 km/h WestMostly Clear
8pm57°F14°C10 mph16 km/h WestMostly Clear
9pm56°F13°C10 mph16 km/h SouthwestMostly Clear
10pm55°F13°C9 mph15 km/h SouthwestMostly Clear
11pm54°F12°C9 mph15 km/h SouthwestPartly Cloudy
September 11
12am54°F12°C9 mph14 km/h SouthwestMostly Clear
1am53°F12°C8 mph13 km/h SouthwestPartly Cloudy
2am53°F12°C8 mph14 km/h SouthwestPartly Cloudy
3am55°F13°C9 mph14 km/h SouthwestMostly Clear
4am57°F14°C11 mph17 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 957°F14°C63°F17°C8 mph13 km/h from SouthRainDrizzle
September 1053°F12°C64°F18°C13 mph20 km/h from SouthwestDrizzleMostly Clear
September 1151°F11°C65°F18°C12 mph19 km/h from SouthwestDrizzleDrizzle
September 1253°F12°C64°F18°C11 mph17 km/h from SouthwestDrizzlePartly Cloudy
September 1352°F11°C66°F19°C15 mph23 km/h from SouthRainThunderstorms
September 1455°F13°C64°F18°C20 mph32 km/h from SouthwestDrizzlePartly Cloudy
September 1553°F12°C63°F17°C14 mph22 km/h from WestMostly CloudyPartly Cloudy

Yes

Low of 54°F12°C, High of 64°F18°C
Wind: 13 mph20 km/h
Precipitation: 65% rain

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