Yes

you do need a jacket based on the weather in Bristol, UK 11 minutes ago

Why? Because it's cold. simple as that.
49°F10°C & Mostly Cloudy

Wind is 13 mph21 km/h from the SE, gusting to 25 mph40 km/h
April 30
1am49°F10°C13 mph22 km/h SEMostly Cloudy
2am50°F10°C14 mph23 km/h SECloudy
3am51°F11°C16 mph26 km/h SEWindy
4am52°F11°C17 mph28 km/h SEWindy
5am54°F12°C18 mph28 km/h SWindy
6am56°F13°C18 mph29 km/h SWindy
7am58°F14°C18 mph30 km/h SWindy
8am58°F15°C19 mph30 km/h SWindy
9am57°F14°C17 mph27 km/h SWindy
10am57°F14°C16 mph26 km/h SWindy
11am56°F13°C16 mph26 km/h SDrizzle
12pm55°F13°C14 mph23 km/h SRain
DateLowHighWindDayNight
April 2949°F10°C58°F15°C16 mph26 km/h from SRainDrizzle
April 3048°F9°C61°F16°C4 mph6 km/h from NRainRain
May 152°F11°C62°F16°C9 mph14 km/h from NRainRain
May 250°F10°C57°F14°C11 mph18 km/h from WRainMostly Cloudy
May 348°F9°C61°F16°C9 mph14 km/h from SDrizzleMostly Cloudy
May 450°F10°C60°F16°C10 mph16 km/h from SDrizzleDrizzle
May 550°F10°C62°F17°C8 mph13 km/h from SWPartly CloudyMostly Cloudy

Yes

Low of 47°F9°C, High of 61°F16°C
Wind: 4 mph6 km/h
Precipitation: 36% rain

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