Yes

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

Why? Because a jacket will keep you cozy, but you won't break a seat and it's so windy, your hat will probably launch into orbit!
51°F10°C & Windy

Wind is 15 mph24 km/h from the Southwest, gusting to 27 mph44 km/h
September 11
11pm51°F10°C15 mph24 km/h SouthwestWindy
September 12
12am50°F10°C15 mph24 km/h SouthwestWindy
1am50°F10°C15 mph24 km/h SouthwestMostly Clear
2am50°F10°C15 mph24 km/h SouthwestPartly Cloudy
3am51°F10°C15 mph25 km/h SouthwestWindy
4am52°F11°C16 mph26 km/h SouthwestWindy
5am54°F12°C17 mph27 km/h SouthwestWindy
6am56°F13°C17 mph28 km/h SouthwestWindy
7am57°F14°C16 mph26 km/h SouthwestWindy
8am58°F14°C16 mph25 km/h SouthwestWindy
9am59°F15°C15 mph25 km/h SouthwestWindy
10am60°F15°C15 mph25 km/h SouthwestWindy
DateLowHighWindDayNight
September 1150°F10°C60°F15°C15 mph25 km/h from SouthwestDrizzleDrizzle
September 1248°F9°C59°F15°C15 mph24 km/h from SouthwestDrizzleMostly Clear
September 1349°F10°C61°F16°C17 mph28 km/h from SoutheastRainDrizzle
September 1453°F12°C59°F15°C19 mph31 km/h from WestDrizzleDrizzle
September 1553°F12°C61°F16°C13 mph20 km/h from WestDrizzleDrizzle
September 1652°F11°C61°F16°C18 mph29 km/h from SouthwestDrizzleDrizzle
September 1750°F10°C61°F16°C11 mph18 km/h from WestDrizzleMostly Cloudy

Yes

Low of 48°F9°C, High of 59°F15°C
Wind: 15 mph24 km/h
Precipitation: 60% rain

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