Yes

you do need a jacket based on the weather in Letchworth Garden City, UK 1 second ago

Why? Because it's not very warm out.
56°F13°C & Windy

Wind is 17 mph28 km/h from the SW, gusting to 32 mph52 km/h
March 29
12pm55°F13°C18 mph28 km/h SWWindy
1pm53°F12°C16 mph26 km/h SWWindy
2pm51°F11°C14 mph23 km/h SMostly Clear
3pm49°F9°C12 mph20 km/h SMostly Clear
4pm47°F8°C11 mph18 km/h SMostly Clear
5pm46°F8°C10 mph17 km/h SMostly Cloudy
6pm45°F7°C10 mph15 km/h SMostly Cloudy
7pm44°F7°C9 mph14 km/h SPartly Cloudy
8pm43°F6°C8 mph13 km/h SPartly Cloudy
9pm43°F6°C7 mph12 km/h SPartly Cloudy
10pm42°F6°C6 mph10 km/h SMostly Cloudy
11pm42°F5°C6 mph9 km/h SMostly Cloudy
DateLowHighWindDayNight
March 2842°F6°C56°F13°C15 mph24 km/h from SDrizzleMostly Cloudy
March 2940°F4°C56°F13°C5 mph7 km/h from SCloudyPartly Cloudy
March 3039°F4°C56°F13°C13 mph21 km/h from EMostly CloudyDrizzle
March 3143°F6°C53°F12°C9 mph14 km/h from NWDrizzleMostly Cloudy
April 141°F5°C56°F13°C8 mph12 km/h from SWMostly CloudyDrizzle
April 244°F6°C52°F11°C16 mph25 km/h from WRainMostly Cloudy
April 339°F4°C54°F12°C15 mph23 km/h from SCloudyDrizzle

Yes

Low of 39°F4°C, High of 56°F14°C
Wind: 5 mph7 km/h
Precipitation: None

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