Yes

you do need a jacket based on the weather in London, UK 6 minutes ago

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
49°F9°C & Clear

Wind is 7 mph12 km/h from the East, gusting to 19 mph30 km/h
April 3
3am49°F10°C8 mph13 km/h EastClear
4am52°F11°C9 mph14 km/h EastClear
5am56°F13°C9 mph15 km/h EastClear
6am60°F15°C10 mph16 km/h EastClear
7am62°F17°C11 mph17 km/h EastClear
8am64°F18°C11 mph18 km/h EastMostly Clear
9am65°F18°C11 mph18 km/h EastMostly Clear
10am65°F18°C11 mph18 km/h EastPartly Cloudy
11am64°F18°C11 mph18 km/h EastMostly Cloudy
12pm63°F17°C11 mph17 km/h EastCloudy
1pm62°F16°C10 mph16 km/h EastCloudy
2pm60°F16°C9 mph14 km/h EastMostly Cloudy
DateLowHighWindDayNight
April 248°F9°C65°F18°C10 mph16 km/h from EastMostly ClearMostly Cloudy
April 350°F10°C69°F21°C10 mph16 km/h from EastPartly CloudyClear
April 444°F6°C64°F18°C11 mph17 km/h from NortheastClearClear
April 543°F6°C58°F14°C11 mph18 km/h from EastClearClear
April 640°F4°C60°F16°C7 mph11 km/h from EastClearMostly Clear
April 737°F3°C60°F16°C5 mph8 km/h from NortheastMostly ClearPartly Cloudy
April 840°F5°C63°F17°C7 mph11 km/h from NortheastPartly CloudyPartly Cloudy

Yes

Low of 50°F10°C, High of 69°F21°C
Wind: 10 mph16 km/h
Precipitation: None

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