Yes

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

Why? Because it's cold. simple as that.
40°F5°C & Windy

Wind is 17 mph27 km/h from the NW, gusting to 28 mph45 km/h
April 24
3am41°F5°C18 mph29 km/h NWindy
4am42°F6°C20 mph32 km/h NWindy
5am44°F6°C20 mph32 km/h NWindy
6am45°F7°C20 mph32 km/h NWindy
7am46°F8°C19 mph31 km/h NWindy
8am46°F8°C19 mph30 km/h NWindy
9am47°F8°C18 mph30 km/h NWindy
10am47°F8°C18 mph29 km/h NWindy
11am46°F8°C17 mph27 km/h NWindy
12pm46°F8°C16 mph26 km/h NWindy
1pm45°F7°C15 mph24 km/h NMostly Cloudy
2pm44°F7°C14 mph22 km/h NMostly Cloudy
DateLowHighWindDayNight
April 2339°F4°C47°F8°C18 mph29 km/h from NDrizzleMostly Cloudy
April 2438°F3°C48°F9°C12 mph19 km/h from NWRainPartly Cloudy
April 2536°F2°C49°F9°C8 mph14 km/h from EMostly CloudyMostly Cloudy
April 2643°F6°C54°F12°C14 mph22 km/h from ERainMostly Cloudy
April 2748°F9°C58°F15°C15 mph24 km/h from SDrizzleMostly Cloudy
April 2848°F9°C61°F16°C15 mph24 km/h from SPartly CloudyMostly Clear
April 2945°F7°C59°F15°C12 mph20 km/h from SEPartly CloudyMostly Cloudy

Yes

Low of 37°F3°C, High of 47°F9°C
Wind: 12 mph19 km/h
Precipitation: 31% rain

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