Yes

you do need a jacket based on the weather in Lancing BN15, UK 1 second ago

Why? Because it's not very warm out.
55°F13°C & Mostly Clear

Wind is 4 mph7 km/h from the W, gusting to 6 mph9 km/h
July 14
1am56°F13°C5 mph8 km/h WMostly Clear
2am58°F14°C6 mph9 km/h WMostly Clear
3am60°F15°C6 mph10 km/h WPartly Cloudy
4am62°F16°C8 mph12 km/h SWPartly Cloudy
5am64°F18°C8 mph13 km/h SWPartly Cloudy
6am65°F18°C9 mph15 km/h SWMostly Cloudy
7am66°F19°C11 mph17 km/h SWMostly Cloudy
8am66°F19°C11 mph18 km/h SWCloudy
9am66°F19°C11 mph18 km/h SWCloudy
10am66°F19°C11 mph18 km/h SWCloudy
11am67°F19°C11 mph18 km/h SWMostly Cloudy
12pm67°F20°C12 mph19 km/h SWPartly Cloudy
DateLowHighWindDayNight
July 1354°F12°C67°F20°C10 mph16 km/h from SWMostly CloudyMostly Clear
July 1454°F12°C68°F20°C9 mph14 km/h from SERainDrizzle
July 1558°F14°C70°F21°C14 mph23 km/h from SWDrizzlePartly Cloudy
July 1656°F13°C71°F22°C9 mph14 km/h from SWPartly CloudyMostly Cloudy
July 1759°F15°C72°F22°C11 mph17 km/h from SWMostly CloudyPartly Cloudy
July 1857°F14°C72°F22°C12 mph19 km/h from WPartly CloudyPartly Cloudy
July 1957°F14°C68°F20°C12 mph20 km/h from SWDrizzleDrizzle

Yes

Low of 55°F13°C, High of 68°F20°C
Wind: 9 mph14 km/h
Precipitation: 65% rain

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