No

you don't need a jacket based on the weather in Essex, UK 1 second ago

59°F15°C & Clear

Wind is 9 mph14 km/h from the Northeast, gusting to 19 mph30 km/h
May 19
3pm59°F15°C9 mph14 km/h NortheastClear
4pm56°F14°C7 mph12 km/h NortheastClear
5pm54°F12°C6 mph10 km/h NortheastClear
6pm52°F11°C6 mph9 km/h NortheastClear
7pm50°F10°C6 mph10 km/h NortheastClear
8pm49°F9°C6 mph10 km/h NortheastClear
9pm48°F9°C6 mph10 km/h NorthClear
10pm47°F8°C6 mph10 km/h NorthClear
11pm47°F8°C6 mph10 km/h NorthClear
May 20
12am47°F8°C6 mph10 km/h NorthClear
1am47°F9°C6 mph10 km/h NorthClear
2am50°F10°C6 mph10 km/h NorthClear
DateLowHighWindDayNight
May 1848°F9°C65°F19°C9 mph14 km/h from EastPartly CloudyClear
May 1946°F8°C69°F20°C6 mph10 km/h from NortheastPartly CloudyCloudy
May 2050°F10°C66°F19°C6 mph9 km/h from NorthwestMostly CloudyMostly Clear
May 2145°F7°C59°F15°C7 mph11 km/h from NorthMostly CloudyMostly Clear
May 2242°F6°C62°F17°C7 mph12 km/h from WestPartly CloudyMostly Cloudy
May 2350°F10°C63°F17°C12 mph19 km/h from SouthwestDrizzleRain
May 2454°F12°C64°F18°C14 mph23 km/h from WestRainPartly Cloudy

Yes

Low of 46°F8°C, High of 69°F21°C
Wind: 6 mph10 km/h
Precipitation: None

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