Yes

you do need a jacket based on the weather in Whitstable CT5, UK 1 second ago

Why? Because it's not very warm out and there are strong winds blowing out there!
57°F14°C & Windy

Wind is 19 mph31 km/h from the West, gusting to 28 mph45 km/h
October 28
1pm57°F14°C19 mph30 km/h WestWindy
2pm58°F14°C19 mph30 km/h WestWindy
3pm57°F14°C16 mph26 km/h WestWindy
4pm56°F14°C15 mph24 km/h WestWindy
5pm55°F13°C15 mph24 km/h SouthwestMostly Cloudy
6pm54°F12°C14 mph22 km/h SouthwestPartly Cloudy
7pm53°F12°C13 mph20 km/h SouthwestMostly Cloudy
8pm53°F12°C12 mph19 km/h SouthwestMostly Cloudy
9pm53°F12°C11 mph18 km/h SouthwestMostly Cloudy
10pm53°F11°C12 mph19 km/h SouthwestCloudy
11pm52°F11°C12 mph19 km/h SouthwestMostly Cloudy
October 29
12am52°F11°C12 mph19 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
October 2852°F11°C58°F14°C18 mph28 km/h from WestWindyCloudy
October 2949°F9°C56°F13°C11 mph17 km/h from SouthwestRainMostly Clear
October 3046°F8°C56°F13°C10 mph16 km/h from SouthwestPartly CloudyWindy
October 3155°F13°C60°F15°C17 mph27 km/h from SouthDrizzleDrizzle
November 151°F10°C57°F14°C20 mph32 km/h from SouthwestRainDrizzle
November 247°F8°C53°F12°C16 mph25 km/h from SouthwestRainWindy
November 347°F8°C59°F15°C20 mph33 km/h from SouthwestDrizzleWindy

Yes

Low of 49°F10°C, High of 55°F13°C
Wind: 11 mph17 km/h
Precipitation: 74% rain

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