Yes

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

Why? Because it's pretty chilly!
54°F12°C & Mostly Clear

Wind is 7 mph11 km/h from the South, gusting to 16 mph26 km/h
September 2
12am53°F12°C7 mph11 km/h SouthPartly Cloudy
1am53°F12°C7 mph11 km/h SouthPartly Cloudy
2am53°F12°C6 mph10 km/h SouthPartly Cloudy
3am55°F13°C7 mph11 km/h SouthMostly Clear
4am57°F14°C7 mph11 km/h SouthMostly Clear
5am60°F15°C8 mph13 km/h SouthPartly Cloudy
6am62°F16°C8 mph13 km/h SouthMostly Cloudy
7am62°F17°C8 mph13 km/h SouthCloudy
8am62°F17°C8 mph13 km/h SouthDrizzle
9am63°F17°C8 mph13 km/h SoutheastDrizzle
10am63°F17°C8 mph13 km/h SoutheastDrizzle
11am63°F17°C8 mph12 km/h SoutheastDrizzle
DateLowHighWindDayNight
September 153°F12°C63°F17°C7 mph12 km/h from SouthDrizzleRain
September 256°F14°C65°F18°C15 mph24 km/h from SouthwestRainDrizzle
September 353°F12°C65°F18°C9 mph14 km/h from SouthwestRainMostly Clear
September 451°F11°C68°F20°C7 mph11 km/h from SouthwestPartly CloudyMostly Cloudy
September 553°F12°C71°F22°C11 mph17 km/h from SouthMostly CloudyCloudy
September 659°F15°C69°F20°C11 mph18 km/h from SouthDrizzlePartly Cloudy
September 754°F12°C68°F20°C13 mph20 km/h from SouthPartly CloudyPartly Cloudy

Yes

Low of 56°F14°C, High of 64°F18°C
Wind: 15 mph24 km/h
Precipitation: 75% rain

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