Yes

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

Why? Because it's cold. simple as that.
42°F5°C & Cloudy

Wind is 7 mph11 km/h from the NE, gusting to 11 mph18 km/h
April 26
12am41°F5°C7 mph12 km/h NECloudy
1am41°F5°C8 mph13 km/h NECloudy
2am41°F5°C9 mph14 km/h NECloudy
3am43°F6°C10 mph15 km/h NECloudy
4am44°F7°C10 mph16 km/h NECloudy
5am47°F8°C10 mph16 km/h NECloudy
6am50°F10°C10 mph16 km/h ECloudy
7am51°F11°C10 mph15 km/h ECloudy
8am52°F11°C9 mph15 km/h ECloudy
9am53°F12°C9 mph15 km/h ECloudy
10am53°F12°C9 mph15 km/h ECloudy
11am52°F11°C9 mph15 km/h SECloudy
DateLowHighWindDayNight
April 2541°F5°C53°F12°C9 mph15 km/h from EDrizzleRain
April 2642°F6°C56°F13°C8 mph12 km/h from EDrizzleRain
April 2744°F7°C54°F12°C11 mph17 km/h from NWRainMostly Clear
April 2842°F5°C58°F15°C12 mph19 km/h from SPartly CloudyMostly Clear
April 2946°F8°C61°F16°C11 mph18 km/h from SEDrizzleMostly Cloudy
April 3049°F10°C64°F18°C7 mph11 km/h from EMostly CloudyCloudy
May 152°F11°C61°F16°C8 mph13 km/h from NMostly CloudyDrizzle

Yes

Low of 42°F6°C, High of 55°F13°C
Wind: 8 mph12 km/h
Precipitation: 59% rain

Support This Page