Yes

you do need a jacket based on the weather in Medmerry Hill, Brighton, Brighton and Hove, Brighton BN2 4TQ, UK 1 second ago

Why? Because it's pretty chilly and there are strong winds blowing out there!
52°F11°C & Windy

Wind is 17 mph28 km/h from the West, gusting to 30 mph48 km/h
October 27
2am51°F11°C18 mph28 km/h WestWindy
3am50°F10°C18 mph29 km/h WestWindy
4am50°F10°C18 mph28 km/h WestWindy
5am49°F9°C18 mph28 km/h WestWindy
6am49°F9°C18 mph29 km/h WestWindy
7am49°F9°C19 mph30 km/h WestWindy
8am50°F10°C20 mph32 km/h WestWindy
9am51°F11°C20 mph31 km/h WestWindy
10am53°F12°C20 mph32 km/h WestWindy
11am54°F12°C20 mph33 km/h NorthwestWindy
12pm55°F13°C20 mph31 km/h NorthwestWindy
1pm56°F13°C18 mph29 km/h NorthwestWindy
DateLowHighWindDayNight
October 2749°F9°C56°F14°C17 mph27 km/h from WestWindyWindy
October 2852°F11°C59°F15°C17 mph27 km/h from WestWindyDrizzle
October 2946°F8°C57°F14°C12 mph19 km/h from WestDrizzlePartly Cloudy
October 3042°F6°C58°F14°C13 mph22 km/h from SoutheastMostly CloudyRain
October 3153°F12°C59°F15°C16 mph26 km/h from SouthwestWindyRain
November 152°F11°C59°F15°C24 mph38 km/h from SouthwestRainDrizzle
November 250°F10°C55°F13°C19 mph31 km/h from SouthwestRainWindy

Yes

Low of 53°F12°C, High of 59°F15°C
Wind: 17 mph27 km/h
Precipitation: None

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