Yes

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

Why? Because it's pretty chilly.
55°F13°C & Windy

Wind is 15 mph24 km/h from the NE, gusting to 28 mph45 km/h
September 20
4am56°F14°C16 mph25 km/h NEWindy
5am59°F15°C16 mph26 km/h NEWindy
6am61°F16°C16 mph25 km/h NEWindy
7am65°F18°C14 mph23 km/h NEMostly Cloudy
8am67°F19°C13 mph21 km/h NEPartly Cloudy
9am68°F20°C13 mph20 km/h NEPartly Cloudy
10am69°F20°C11 mph18 km/h NEMostly Cloudy
11am68°F20°C11 mph17 km/h NERain
12pm66°F19°C9 mph15 km/h NERain
1pm64°F18°C10 mph16 km/h NEMostly Cloudy
2pm63°F17°C10 mph16 km/h NEMostly Clear
3pm61°F16°C10 mph16 km/h NEPartly Cloudy
DateLowHighWindDayNight
September 1953°F12°C69°F20°C13 mph21 km/h from NERainDrizzle
September 2056°F13°C68°F20°C10 mph16 km/h from NERainRain
September 2158°F14°C67°F19°C6 mph10 km/h from ERainDrizzle
September 2256°F13°C63°F17°C5 mph8 km/h from NWDrizzleMostly Cloudy
September 2352°F11°C62°F17°C6 mph10 km/h from SWMostly CloudyRain
September 2456°F13°C62°F17°C14 mph23 km/h from SWRainRain
September 2551°F10°C58°F14°C14 mph22 km/h from WPartly CloudyDrizzle

Yes

Low of 56°F14°C, High of 68°F20°C
Wind: 10 mph16 km/h
Precipitation: 60% rain

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