Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's windy enough to give you a brand new hairdo!
58°F15°C & Cloudy

Wind is 12 mph20 km/h from the South, gusting to 24 mph38 km/h
November 4
3pm58°F15°C13 mph21 km/h SouthCloudy
4pm59°F15°C15 mph23 km/h SouthDrizzle
5pm59°F15°C15 mph24 km/h SouthCloudy
6pm59°F15°C15 mph24 km/h SouthWindy
7pm59°F15°C15 mph24 km/h SouthCloudy
8pm59°F15°C14 mph22 km/h SouthCloudy
9pm59°F15°C15 mph24 km/h SouthCloudy
10pm59°F15°C15 mph24 km/h SouthCloudy
11pm59°F15°C15 mph24 km/h SouthCloudy
November 5
12am59°F15°C14 mph22 km/h SouthCloudy
1am58°F15°C13 mph20 km/h SouthCloudy
2am58°F15°C12 mph19 km/h SouthCloudy
DateLowHighWindDayNight
November 457°F14°C59°F15°C11 mph18 km/h from SouthDrizzleCloudy
November 558°F14°C61°F16°C11 mph17 km/h from SoutheastCloudyCloudy
November 656°F13°C60°F16°C7 mph11 km/h from SouthDrizzleMostly Cloudy
November 754°F12°C58°F14°C9 mph14 km/h from SouthDrizzleDrizzle
November 849°F10°C58°F14°C5 mph8 km/h from SouthMostly ClearPartly Cloudy
November 948°F9°C56°F13°C4 mph6 km/h from SoutheastMostly CloudyDrizzle
November 1050°F10°C55°F13°C8 mph12 km/h from SouthDrizzleMostly Cloudy

Yes

Low of 58°F15°C, High of 61°F16°C
Wind: 11 mph17 km/h
Precipitation: None

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