Yes

you do need a jacket based on the weather in Antrim BT41, UK 1 second ago

Why? Because it's pretty chilly and it's so windy, you’re practically horizontal just trying to walk!
53°F12°C & Windy

Wind is 17 mph27 km/h from the Northwest, gusting to 30 mph48 km/h
October 21
12pm53°F12°C17 mph28 km/h NorthwestWindy
1pm53°F12°C17 mph28 km/h NorthwestWindy
2pm53°F12°C17 mph28 km/h NorthwestWindy
3pm53°F12°C16 mph26 km/h NorthwestWindy
4pm52°F11°C14 mph23 km/h NorthwestPartly Cloudy
5pm51°F11°C13 mph20 km/h WestPartly Cloudy
6pm50°F10°C11 mph18 km/h WestPartly Cloudy
7pm50°F10°C11 mph17 km/h WestPartly Cloudy
8pm49°F9°C10 mph16 km/h WestPartly Cloudy
9pm49°F9°C10 mph16 km/h WestPartly Cloudy
10pm48°F9°C9 mph14 km/h WestMostly Cloudy
11pm47°F9°C8 mph14 km/h WestPartly Cloudy
DateLowHighWindDayNight
October 2047°F9°C53°F12°C14 mph23 km/h from WestDrizzlePartly Cloudy
October 2142°F5°C51°F11°C8 mph14 km/h from SouthwestPartly CloudyMostly Cloudy
October 2241°F5°C48°F9°C15 mph24 km/h from WestWindyDrizzle
October 2343°F6°C51°F10°C13 mph21 km/h from NorthDrizzleWindy
October 2442°F6°C47°F8°C17 mph27 km/h from NorthwestWindyDrizzle
October 2541°F5°C49°F10°C12 mph20 km/h from WestMostly CloudyDrizzle
October 2746°F8°C51°F11°C16 mph25 km/h from NorthwestWindyMostly Cloudy

Yes

Low of 42°F6°C, High of 51°F11°C
Wind: 8 mph14 km/h
Precipitation: None

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