Yes

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

Why? Because it's pretty chilly.
55°F13°C & Windy

Wind is 19 mph30 km/h from the SW, gusting to 34 mph55 km/h
March 29
11am55°F13°C19 mph30 km/h SWWindy
12pm54°F12°C18 mph28 km/h SWWindy
1pm53°F11°C16 mph25 km/h SWWindy
2pm51°F10°C13 mph21 km/h SWPartly Cloudy
3pm49°F9°C11 mph17 km/h SWPartly Cloudy
4pm48°F9°C9 mph15 km/h SWPartly Cloudy
5pm47°F8°C8 mph13 km/h SWPartly Cloudy
6pm47°F8°C8 mph12 km/h SWPartly Cloudy
7pm47°F8°C7 mph11 km/h SWPartly Cloudy
8pm46°F8°C7 mph11 km/h SPartly Cloudy
9pm47°F8°C6 mph10 km/h SMostly Cloudy
10pm46°F8°C5 mph8 km/h SCloudy
DateLowHighWindDayNight
March 2845°F7°C55°F13°C16 mph25 km/h from SWRainMostly Cloudy
March 2944°F7°C55°F13°C6 mph10 km/h from SMostly CloudyPartly Cloudy
March 3045°F7°C57°F14°C15 mph24 km/h from EWindyRain
March 3145°F7°C52°F11°C8 mph13 km/h from NWRainDrizzle
April 145°F7°C54°F12°C9 mph15 km/h from SRainRain
April 245°F7°C54°F12°C21 mph33 km/h from WDrizzleMostly Cloudy
April 344°F7°C54°F12°C15 mph24 km/h from SDrizzleDrizzle

Yes

Low of 45°F7°C, High of 55°F13°C
Wind: 6 mph10 km/h
Precipitation: None

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