Yes

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

Why? Because it's so windy, your hat will probably launch into orbit!
60°F15°C & Windy

Wind is 17 mph27 km/h from the Northeast, gusting to 27 mph43 km/h
April 4
12pm59°F15°C17 mph27 km/h NortheastWindy
1pm57°F14°C16 mph26 km/h NortheastWindy
2pm53°F12°C16 mph25 km/h NortheastWindy
3pm49°F10°C14 mph23 km/h NortheastClear
4pm47°F8°C13 mph21 km/h NortheastClear
5pm45°F7°C12 mph19 km/h NortheastClear
6pm44°F7°C11 mph18 km/h NortheastClear
7pm43°F6°C11 mph18 km/h NortheastClear
8pm42°F5°C11 mph18 km/h NortheastMostly Clear
9pm41°F5°C11 mph17 km/h NortheastMostly Clear
10pm41°F5°C11 mph17 km/h NortheastPartly Cloudy
11pm41°F5°C11 mph18 km/h NortheastMostly Cloudy
DateLowHighWindDayNight
April 342°F6°C65°F18°C12 mph20 km/h from NortheastMostly ClearMostly Clear
April 440°F5°C58°F15°C15 mph24 km/h from NortheastWindyClear
April 539°F4°C57°F14°C12 mph19 km/h from EastClearClear
April 634°F1°C58°F14°C4 mph7 km/h from EastClearClear
April 735°F2°C60°F15°C4 mph6 km/h from NortheastMostly ClearPartly Cloudy
April 837°F3°C54°F12°C11 mph18 km/h from NortheastMostly CloudyMostly Cloudy
April 939°F4°C62°F17°C6 mph10 km/h from NorthwestMostly ClearClear

Yes

Low of 40°F5°C, High of 58°F15°C
Wind: 15 mph24 km/h
Precipitation: None

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