Yes

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

Why? Because this drizzle is just a polite way of saying, “Get ready, the big stuff's coming.” and too cold for just a hoodie, too warm for a parka and it's really really huffing out there!
49°F9°C & Drizzle

Wind is 18 mph29 km/h from the Northwest, gusting to 35 mph56 km/h
October 23
2pm49°F10°C17 mph28 km/h NorthwestDrizzle
3pm50°F10°C17 mph28 km/h NorthwestWindy
4pm50°F10°C16 mph26 km/h NorthwestWindy
5pm49°F9°C14 mph22 km/h NorthwestPartly Cloudy
6pm48°F9°C13 mph22 km/h NorthwestPartly Cloudy
7pm47°F8°C12 mph20 km/h NorthwestMostly Clear
8pm46°F8°C12 mph20 km/h NorthwestClear
9pm46°F8°C11 mph18 km/h NorthwestMostly Clear
10pm46°F8°C12 mph20 km/h NorthwestClear
11pm46°F8°C11 mph18 km/h WestMostly Clear
October 24
12am46°F8°C11 mph18 km/h WestMostly Clear
1am46°F8°C12 mph19 km/h WestPartly Cloudy
DateLowHighWindDayNight
October 2244°F7°C50°F10°C12 mph19 km/h from NorthwestRainMostly Clear
October 2346°F8°C54°F12°C15 mph24 km/h from WestRainPartly Cloudy
October 2445°F7°C50°F10°C15 mph23 km/h from NorthwestPartly CloudyDrizzle
October 2543°F6°C53°F12°C13 mph20 km/h from NorthwestDrizzleDrizzle
October 2747°F8°C55°F13°C16 mph26 km/h from NorthwestWindyPartly Cloudy
October 2848°F9°C57°F14°C12 mph19 km/h from WestMostly CloudyMostly Cloudy
October 2948°F9°C58°F14°C10 mph16 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 46°F8°C, High of 55°F13°C
Wind: 15 mph24 km/h
Precipitation: 75% rain

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