Yes

you do need a jacket based on the weather in Southend-on-Sea, UK 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter and it's so windy, your hat is now someone else's problem, two cities away!
55°F13°C & Windy

Wind is 16 mph25 km/h from the Southwest, gusting to 27 mph43 km/h
September 11
9pm55°F13°C15 mph25 km/h SouthwestWindy
10pm54°F12°C15 mph25 km/h SouthwestWindy
11pm53°F12°C14 mph23 km/h SouthwestMostly Clear
September 12
12am53°F12°C14 mph22 km/h SouthwestMostly Clear
1am54°F12°C13 mph22 km/h SouthwestPartly Cloudy
2am54°F12°C13 mph21 km/h SouthwestPartly Cloudy
3am55°F13°C13 mph21 km/h SouthwestClear
4am57°F14°C14 mph22 km/h SouthwestMostly Clear
5am58°F15°C14 mph23 km/h SouthwestMostly Clear
6am61°F16°C15 mph25 km/h SouthwestWindy
7am63°F17°C17 mph27 km/h SouthwestWindy
8am64°F18°C17 mph27 km/h SouthwestWindy
DateLowHighWindDayNight
September 1153°F12°C65°F18°C15 mph25 km/h from SouthwestDrizzleDrizzle
September 1254°F12°C65°F18°C15 mph24 km/h from SouthwestDrizzleMostly Clear
September 1351°F10°C66°F19°C14 mph22 km/h from SouthRainDrizzle
September 1457°F14°C66°F19°C24 mph39 km/h from SouthwestWindyWindy
September 1555°F13°C65°F18°C17 mph28 km/h from WestWindyMostly Cloudy
September 1653°F11°C64°F18°C16 mph25 km/h from SouthwestDrizzleWindy
September 1755°F13°C65°F18°C15 mph24 km/h from WestWindyPartly Cloudy

Yes

Low of 55°F13°C, High of 64°F18°C
Wind: 15 mph24 km/h
Precipitation: 65% rain

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