Yes

you do need a jacket based on the weather in Southend-on-Sea, UK 19 minutes ago

Why? Because it's cold. simple as that.
46°F8°C & Cloudy

Wind is 4 mph7 km/h from the N, gusting to 5 mph8 km/h
April 25
4pm45°F7°C5 mph9 km/h NCloudy
5pm45°F7°C6 mph10 km/h NECloudy
6pm44°F7°C6 mph10 km/h NECloudy
7pm43°F6°C6 mph10 km/h NECloudy
8pm42°F6°C6 mph10 km/h NECloudy
9pm42°F5°C7 mph10 km/h NCloudy
10pm41°F5°C6 mph10 km/h NMostly Cloudy
11pm40°F4°C6 mph10 km/h NMostly Cloudy
April 26
12am39°F4°C7 mph11 km/h NCloudy
1am38°F3°C7 mph11 km/h NMostly Cloudy
2am38°F3°C7 mph11 km/h NMostly Cloudy
3am40°F4°C6 mph10 km/h NMostly Cloudy
DateLowHighWindDayNight
April 2437°F3°C53°F12°C11 mph18 km/h from SWRainRain
April 2538°F3°C52°F11°C6 mph10 km/h from EMostly CloudyRain
April 2643°F6°C58°F14°C7 mph12 km/h from SEDrizzleRain
April 2745°F7°C55°F13°C13 mph21 km/h from SWDrizzleMostly Clear
April 2842°F6°C59°F15°C10 mph15 km/h from SPartly CloudyMostly Cloudy
April 2946°F8°C60°F15°C9 mph15 km/h from SECloudyDrizzle
April 3053°F12°C66°F19°C6 mph9 km/h from NEMostly CloudyCloudy

Yes

Low of 37°F3°C, High of 53°F12°C
Wind: 6 mph10 km/h
Precipitation: None

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