Yes

you do need a jacket based on the weather in Leigh-on-Sea, Southend-on-Sea, Leigh-on-Sea SS9, UK 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's super windy outside!
53°F12°C & Windy

Wind is 17 mph27 km/h from the Southwest, gusting to 30 mph49 km/h
October 28
5am53°F12°C17 mph27 km/h SouthwestWindy
6am53°F12°C17 mph28 km/h SouthwestWindy
7am53°F12°C17 mph27 km/h WestWindy
8am54°F12°C15 mph24 km/h WestMostly Cloudy
9am55°F13°C15 mph24 km/h WestPartly Cloudy
10am56°F13°C15 mph25 km/h WestWindy
11am56°F14°C16 mph26 km/h WestWindy
12pm57°F14°C16 mph26 km/h WestWindy
1pm58°F14°C16 mph25 km/h WestWindy
2pm58°F14°C16 mph25 km/h WestWindy
3pm58°F14°C14 mph22 km/h WestMostly Cloudy
4pm57°F14°C12 mph20 km/h WestMostly Cloudy
DateLowHighWindDayNight
October 2850°F10°C58°F14°C14 mph23 km/h from WestPartly CloudyCloudy
October 2946°F8°C57°F14°C9 mph14 km/h from SouthwestDrizzleMostly Clear
October 3043°F6°C56°F13°C8 mph13 km/h from SouthMostly CloudyDrizzle
October 3154°F12°C61°F16°C14 mph23 km/h from SouthDrizzleRain
November 148°F9°C56°F14°C18 mph30 km/h from SouthwestWindyRain
November 244°F7°C52°F11°C9 mph15 km/h from SouthwestRainDrizzle
November 342°F6°C56°F14°C14 mph23 km/h from SouthwestRainDrizzle

Yes

Low of 46°F8°C, High of 57°F14°C
Wind: 9 mph14 km/h
Precipitation: 75% rain

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