Yes

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

Why? Because it's cold. simple as that.
49°F9°C & Cloudy

Wind is 11 mph18 km/h from the W, gusting to 24 mph39 km/h
April 19
12am49°F9°C11 mph18 km/h WCloudy
1am49°F10°C11 mph18 km/h WCloudy
2am50°F10°C11 mph18 km/h WCloudy
3am51°F10°C12 mph20 km/h NWMostly Cloudy
4am51°F11°C14 mph22 km/h NWMostly Cloudy
5am52°F11°C13 mph21 km/h NWMostly Cloudy
6am54°F12°C14 mph23 km/h NWMostly Cloudy
7am55°F13°C15 mph24 km/h NWMostly Cloudy
8am56°F14°C14 mph22 km/h NWMostly Cloudy
9am57°F14°C13 mph21 km/h NWMostly Cloudy
10am57°F14°C13 mph21 km/h NWMostly Cloudy
11am56°F14°C12 mph20 km/h NMostly Cloudy
DateLowHighWindDayNight
April 1843°F6°C57°F14°C13 mph21 km/h from NWMostly CloudyMostly Clear
April 1938°F3°C52°F11°C10 mph16 km/h from NMostly CloudyMostly Clear
April 2038°F3°C53°F12°C10 mph16 km/h from NMostly CloudyPartly Cloudy
April 2139°F4°C53°F11°C9 mph14 km/h from NMostly CloudyMostly Cloudy
April 2241°F5°C52°F11°C8 mph13 km/h from NEMostly CloudyMostly Cloudy
April 2339°F4°C53°F12°C10 mph15 km/h from NMostly CloudyMostly Cloudy
April 2441°F5°C54°F12°C7 mph11 km/h from NMostly CloudyMostly Cloudy

Yes

Low of 38°F4°C, High of 52°F11°C
Wind: 10 mph16 km/h
Precipitation: None

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