Yes

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

Why? Because the rain is just enough to ruin your hairstyle but not your mood and it's quite chilly and it's super windy outside!
49°F9°C & Rain

Wind is 16 mph25 km/h from the Southeast, gusting to 30 mph48 km/h
April 18
2am49°F9°C16 mph26 km/h SoutheastDrizzle
3am49°F10°C17 mph27 km/h SoutheastDrizzle
4am50°F10°C18 mph28 km/h SoutheastDrizzle
5am51°F11°C17 mph28 km/h SoutheastDrizzle
6am52°F11°C18 mph29 km/h SoutheastRain
7am52°F11°C18 mph28 km/h SoutheastRain
8am53°F12°C19 mph31 km/h SoutheastRain
9am53°F12°C19 mph30 km/h SoutheastDrizzle
10am53°F12°C19 mph30 km/h SoutheastDrizzle
11am53°F12°C18 mph29 km/h SoutheastDrizzle
12pm53°F11°C17 mph28 km/h SoutheastDrizzle
1pm52°F11°C17 mph28 km/h SoutheastDrizzle
DateLowHighWindDayNight
April 1748°F9°C53°F12°C18 mph29 km/h from SoutheastRainRain
April 1850°F10°C60°F16°C12 mph19 km/h from EastDrizzleMostly Cloudy
April 1943°F6°C60°F16°C5 mph8 km/h from SoutheastPartly CloudyRain
April 2047°F8°C57°F14°C8 mph13 km/h from SouthwestRainMostly Cloudy
April 2143°F6°C55°F13°C7 mph11 km/h from SouthwestMostly CloudyMostly Cloudy
April 2244°F7°C59°F15°C9 mph15 km/h from NorthMostly CloudyPartly Cloudy
April 2347°F8°C59°F15°C5 mph9 km/h from EastMostly CloudyCloudy

Yes

Low of 50°F10°C, High of 60°F16°C
Wind: 12 mph19 km/h
Precipitation: 79% rain

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