Yes

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

Why? Because too cold for just a hoodie, too warm for a parka and it's really really huffing out there!
45°F7°C & Windy

Wind is 22 mph36 km/h from the Southwest, gusting to 44 mph71 km/h
November 24
8pm45°F7°C23 mph36 km/h SouthwestDrizzle
9pm45°F7°C23 mph37 km/h SouthwestWindy
10pm45°F7°C23 mph37 km/h SouthwestWindy
11pm45°F7°C23 mph36 km/h SouthwestWindy
November 25
12am44°F7°C22 mph36 km/h WestWindy
1am44°F6°C21 mph34 km/h WestWindy
2am43°F6°C21 mph33 km/h WestWindy
3am43°F6°C20 mph32 km/h WestWindy
4am42°F6°C19 mph31 km/h WestWindy
5am43°F6°C19 mph31 km/h WestWindy
6am44°F7°C19 mph30 km/h WestWindy
7am44°F7°C19 mph30 km/h WestWindy
DateLowHighWindDayNight
November 2440°F4°C46°F8°C17 mph27 km/h from WestWindyPartly Cloudy
November 2534°F1°C43°F6°C6 mph10 km/h from WestMostly ClearPartly Cloudy
November 2632°F0°C42°F5°C4 mph6 km/h from NorthwestMostly ClearMostly Clear
November 2732°F0°C46°F8°C11 mph18 km/h from SoutheastMostly CloudyWindy
November 2845°F7°C51°F10°C17 mph28 km/h from SoutheastDrizzleCloudy
November 2947°F8°C51°F11°C13 mph21 km/h from SoutheastCloudyDrizzle
November 3047°F8°C52°F11°C12 mph19 km/h from SouthMostly CloudyPartly Cloudy

Yes

Low of 34°F1°C, High of 43°F6°C
Wind: 6 mph10 km/h
Precipitation: None

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