Yes

you do need a jacket based on the weather in Brighton and Hove (Brighton), England, United Kingdom 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
53°F11°C & Clear

Wind is 6 mph9 km/h from the West, gusting to 11 mph18 km/h
September 13
10pm52°F11°C5 mph8 km/h WestClear
11pm52°F11°C5 mph8 km/h WestPartly Cloudy
September 14
12am51°F11°C4 mph6 km/h WestMostly Cloudy
1am52°F11°C3 mph5 km/h WestPartly Cloudy
2am52°F11°C3 mph5 km/h SouthwestMostly Cloudy
3am56°F13°C4 mph6 km/h SouthCloudy
4am59°F15°C8 mph13 km/h SouthCloudy
5am61°F16°C11 mph17 km/h SouthCloudy
6am62°F17°C13 mph20 km/h SouthCloudy
7am63°F17°C14 mph22 km/h SouthCloudy
8am63°F17°C15 mph24 km/h SouthWindy
9am64°F18°C16 mph26 km/h SouthWindy
DateLowHighWindDayNight
September 1351°F11°C66°F19°C15 mph24 km/h from SouthRainRain
September 1456°F13°C63°F17°C29 mph47 km/h from WestWindyWindy
September 1553°F12°C63°F17°C18 mph29 km/h from WestWindyRain
September 1656°F13°C66°F19°C25 mph40 km/h from SouthwestDrizzleWindy
September 1757°F14°C65°F19°C16 mph25 km/h from SouthwestDrizzlePartly Cloudy
September 1851°F11°C66°F19°C7 mph12 km/h from SouthwestPartly CloudyPartly Cloudy
September 1958°F14°C68°F20°C13 mph22 km/h from SouthMostly CloudyMostly Cloudy

Yes

Low of 56°F14°C, High of 64°F18°C
Wind: 29 mph47 km/h
Precipitation: 26% rain

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