Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
56°F13°C & Cloudy

Wind is 2 mph3 km/h from the West, gusting to 7 mph11 km/h
April 23
10am56°F13°C2 mph4 km/h WestCloudy
11am56°F13°C4 mph7 km/h SouthCloudy
12pm55°F13°C4 mph7 km/h SouthCloudy
1pm55°F13°C3 mph6 km/h SouthwestMostly Cloudy
2pm55°F13°C2 mph4 km/h SouthwestMostly Cloudy
3pm53°F12°C2 mph4 km/h SouthwestMostly Cloudy
4pm51°F11°C2 mph4 km/h SouthwestMostly Cloudy
5pm50°F10°C2 mph3 km/h WestMostly Cloudy
6pm50°F10°C2 mph3 km/h NorthPartly Cloudy
7pm49°F9°C2 mph3 km/h NortheastMostly Cloudy
8pm48°F9°C2 mph4 km/h NortheastMostly Cloudy
9pm48°F9°C3 mph4 km/h EastMostly Cloudy
DateLowHighWindDayNight
April 2246°F8°C57°F14°C5 mph8 km/h from NorthMostly CloudyMostly Cloudy
April 2346°F8°C58°F14°C7 mph12 km/h from SoutheastMostly CloudyMostly Cloudy
April 2447°F9°C57°F14°C13 mph22 km/h from SoutheastCloudyDrizzle
April 2547°F8°C58°F14°C7 mph11 km/h from SouthwestPartly CloudyPartly Cloudy
April 2645°F7°C57°F14°C12 mph19 km/h from SouthwestCloudyCloudy
April 2749°F10°C65°F18°C10 mph16 km/h from SoutheastMostly CloudyPartly Cloudy
April 2852°F11°C68°F20°C16 mph26 km/h from SoutheastWindyDrizzle

Yes

Low of 46°F8°C, High of 58°F15°C
Wind: 7 mph12 km/h
Precipitation: None

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