Yes

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

Why? Because it's quite chilly!
44°F7°C & Mostly Cloudy

Wind is 3 mph5 km/h from the South, gusting to 6 mph9 km/h
January 20
11am43°F6°C3 mph5 km/h SouthwestMostly Cloudy
12pm42°F6°C3 mph5 km/h SouthwestMostly Cloudy
1pm41°F5°C3 mph5 km/h SouthwestPartly Cloudy
2pm40°F5°C3 mph4 km/h SouthPartly Cloudy
3pm40°F4°C3 mph4 km/h SouthMostly Cloudy
4pm39°F4°C3 mph4 km/h SouthPartly Cloudy
5pm38°F3°C3 mph4 km/h SouthPartly Cloudy
6pm38°F3°C3 mph4 km/h SouthPartly Cloudy
7pm37°F3°C2 mph4 km/h SouthPartly Cloudy
8pm36°F2°C2 mph3 km/h SoutheastPartly Cloudy
9pm36°F2°C2 mph3 km/h SoutheastMostly Cloudy
10pm36°F2°C2 mph3 km/h EastMostly Cloudy
DateLowHighWindDayNight
January 1935°F1°C44°F7°C2 mph3 km/h from SouthwestMostly CloudyMostly Cloudy
January 2035°F1°C44°F7°C5 mph8 km/h from EastCloudyCloudy
January 2135°F2°C43°F6°C5 mph9 km/h from NorthCloudyPartly Cloudy
January 2234°F1°C48°F9°C13 mph21 km/h from SouthwestRainRain
January 2345°F7°C52°F11°C20 mph32 km/h from SouthwestRainDrizzle
January 2442°F6°C47°F9°C7 mph12 km/h from SouthwestRainMostly Cloudy
January 2541°F5°C49°F9°C19 mph30 km/h from SouthThunderstormsThunderstorms

Yes

Low of 35°F2°C, High of 45°F7°C
Wind: 5 mph8 km/h
Precipitation: None

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