Yes

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

Why? Because too cold for just a hoodie, too warm for a parka!
49°F10°C & Mostly Clear

Wind is 4 mph6 km/h from the West, gusting to 6 mph10 km/h
November 9
12am49°F10°C4 mph7 km/h WestClear
1am49°F10°C3 mph6 km/h WestMostly Clear
2am49°F9°C3 mph5 km/h WestMostly Clear
3am49°F9°C3 mph5 km/h WestPartly Cloudy
4am50°F10°C3 mph6 km/h WestPartly Cloudy
5am50°F10°C4 mph6 km/h SouthwestMostly Clear
6am51°F10°C5 mph8 km/h SouthwestMostly Clear
7am52°F11°C5 mph9 km/h SouthwestPartly Cloudy
8am53°F12°C7 mph11 km/h SouthwestMostly Cloudy
9am55°F13°C10 mph17 km/h SouthwestMostly Cloudy
10am56°F13°C13 mph21 km/h SouthwestMostly Cloudy
11am57°F14°C14 mph23 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
November 849°F10°C59°F15°C4 mph6 km/h from WestPartly CloudyMostly Clear
November 949°F9°C57°F14°C13 mph21 km/h from SouthMostly CloudyRain
November 1051°F10°C57°F14°C18 mph28 km/h from SouthwestRainPartly Cloudy
November 1151°F10°C59°F15°C19 mph31 km/h from SouthWindyDrizzle
November 1255°F13°C59°F15°C15 mph23 km/h from SouthMostly CloudyCloudy
November 1356°F13°C60°F15°C8 mph13 km/h from SouthDrizzleRain
November 1454°F12°C60°F16°C11 mph17 km/h from SoutheastDrizzleDrizzle

Yes

Low of 49°F10°C, High of 57°F14°C
Wind: 13 mph21 km/h
Precipitation: None

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