Yes

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

Why? Because some drizzle out there and it's not very warm out and the wind is harsh and biting!
59°F15°C & Drizzle

Wind is 12 mph20 km/h from the West, gusting to 21 mph33 km/h
June 7
2pm58°F15°C10 mph17 km/h WestRain
3pm57°F14°C9 mph15 km/h WestPartly Cloudy
4pm56°F13°C10 mph16 km/h WestPartly Cloudy
5pm54°F12°C10 mph16 km/h WestMostly Clear
6pm53°F12°C10 mph15 km/h WestMostly Clear
7pm52°F11°C10 mph15 km/h WestMostly Clear
8pm51°F10°C9 mph15 km/h WestMostly Clear
9pm50°F10°C9 mph15 km/h NorthwestMostly Clear
10pm49°F9°C9 mph14 km/h NorthwestMostly Clear
11pm48°F9°C8 mph13 km/h NorthwestMostly Clear
June 8
12am48°F9°C8 mph13 km/h NorthwestClear
1am48°F9°C8 mph13 km/h WestClear
DateLowHighWindDayNight
June 652°F11°C61°F16°C8 mph13 km/h from WestRainRain
June 748°F9°C63°F17°C13 mph21 km/h from WestPartly CloudyMostly Clear
June 849°F9°C64°F18°C10 mph16 km/h from SouthwestMostly CloudyMostly Cloudy
June 954°F12°C69°F20°C10 mph15 km/h from WestMostly CloudyMostly Clear
June 1054°F12°C75°F24°C9 mph15 km/h from SoutheastMostly ClearMostly Cloudy
June 1160°F16°C71°F22°C9 mph15 km/h from SouthMostly CloudyPartly Cloudy
June 1259°F15°C72°F22°C9 mph15 km/h from SouthwestPartly CloudyMostly Clear

Yes

Low of 47°F9°C, High of 63°F17°C
Wind: 13 mph21 km/h
Precipitation: 6% rain

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