Yes

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

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it!
47°F9°C & Mostly Clear

Wind is 3 mph5 km/h from the Northeast, gusting to 4 mph7 km/h
May 23
12am46°F8°C3 mph5 km/h NortheastMostly Clear
1am47°F8°C3 mph4 km/h NortheastMostly Clear
2am50°F10°C1 mph2 km/h EastMostly Clear
3am54°F12°C2 mph3 km/h SouthMostly Clear
4am56°F13°C4 mph7 km/h SouthwestMostly Clear
5am58°F14°C6 mph9 km/h SouthwestPartly Cloudy
6am59°F15°C7 mph11 km/h SouthwestMostly Cloudy
7am60°F15°C8 mph13 km/h SouthwestMostly Cloudy
8am60°F16°C10 mph16 km/h SouthwestCloudy
9am60°F16°C11 mph18 km/h SouthwestCloudy
10am61°F16°C11 mph18 km/h SouthwestCloudy
11am62°F16°C12 mph19 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
May 2246°F8°C62°F16°C8 mph14 km/h from SouthwestMostly CloudyRain
May 2355°F13°C67°F19°C16 mph25 km/h from SouthwestDrizzleWindy
May 2454°F12°C65°F19°C18 mph29 km/h from WestWindyMostly Clear
May 2552°F11°C62°F17°C17 mph27 km/h from SouthwestWindyDrizzle
May 2655°F13°C62°F17°C21 mph33 km/h from SouthwestRainRain
May 2756°F13°C65°F18°C17 mph28 km/h from WestWindyCloudy
May 2855°F13°C69°F21°C12 mph19 km/h from WestCloudyMostly Cloudy

Yes

Low of 55°F13°C, High of 67°F20°C
Wind: 16 mph25 km/h
Precipitation: 42% rain

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