Yes

you do need a jacket based on the weather in Holsworthy EX22, UK 1 second ago

Why? Because it's cold. simple as that.
40°F5°C & Partly Cloudy

Wind is 7 mph11 km/h from the S, gusting to 14 mph22 km/h
March 28
7pm40°F4°C7 mph11 km/h SPartly Cloudy
8pm40°F4°C7 mph12 km/h SPartly Cloudy
9pm40°F5°C7 mph12 km/h SPartly Cloudy
10pm41°F5°C9 mph14 km/h SMostly Cloudy
11pm42°F5°C9 mph14 km/h SPartly Cloudy
March 29
12am42°F6°C8 mph13 km/h SPartly Cloudy
1am42°F5°C8 mph13 km/h SMostly Clear
2am42°F5°C9 mph14 km/h SMostly Clear
3am43°F6°C10 mph17 km/h SMostly Clear
4am45°F7°C14 mph22 km/h SMostly Clear
5am47°F9°C18 mph29 km/h SWindy
6am49°F9°C20 mph33 km/h SWindy
DateLowHighWindDayNight
March 2734°F1°C49°F10°C18 mph29 km/h from SWRainPartly Cloudy
March 2840°F4°C51°F10°C17 mph28 km/h from SWDrizzleMostly Clear
March 2939°F4°C53°F12°C11 mph18 km/h from SPartly CloudyRain
March 3043°F6°C54°F12°C16 mph26 km/h from EWindyCloudy
March 3142°F6°C52°F11°C7 mph12 km/h from SDrizzleMostly Cloudy
April 143°F6°C54°F12°C12 mph20 km/h from SRainDrizzle
April 247°F8°C53°F11°C20 mph32 km/h from WWindyDrizzle

Yes

Low of 40°F5°C, High of 51°F11°C
Wind: 17 mph28 km/h
Precipitation: 34% rain

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