Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
51°F11°C & Clear

Wind is 5 mph8 km/h from the Southwest, gusting to 12 mph20 km/h
September 13
9pm50°F10°C5 mph8 km/h SouthwestClear
10pm50°F10°C5 mph7 km/h SouthwestClear
11pm49°F10°C4 mph7 km/h SouthwestMostly Clear
September 14
12am49°F9°C4 mph6 km/h SouthwestPartly Cloudy
1am48°F9°C3 mph5 km/h SouthwestPartly Cloudy
2am48°F9°C3 mph4 km/h SouthMostly Cloudy
3am50°F10°C3 mph4 km/h SouthCloudy
4am53°F12°C3 mph5 km/h SouthCloudy
5am56°F14°C4 mph7 km/h SouthCloudy
6am59°F15°C6 mph10 km/h SouthCloudy
7am61°F16°C8 mph12 km/h SouthCloudy
8am62°F17°C9 mph14 km/h SouthCloudy
DateLowHighWindDayNight
September 1348°F9°C65°F18°C8 mph13 km/h from SouthRainRain
September 1455°F13°C64°F18°C19 mph30 km/h from SouthwestWindyMostly Clear
September 1552°F11°C64°F18°C12 mph20 km/h from WestMostly CloudyDrizzle
September 1654°F12°C68°F20°C15 mph23 km/h from SouthwestDrizzleCloudy
September 1756°F13°C67°F19°C9 mph14 km/h from SouthwestDrizzlePartly Cloudy
September 1851°F11°C67°F20°C5 mph9 km/h from SouthwestPartly CloudyPartly Cloudy
September 1955°F13°C69°F21°C9 mph14 km/h from SouthMostly CloudyMostly Cloudy

Yes

Low of 55°F13°C, High of 64°F18°C
Wind: 19 mph30 km/h
Precipitation: 26% rain

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