Yes

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

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and a jacket will keep you cozy, but you won't break a seat!
55°F13°C & Drizzle

Wind is 6 mph9 km/h from the Southwest, gusting to 15 mph24 km/h
May 23
8pm54°F12°C7 mph11 km/h SouthwestDrizzle
9pm53°F12°C8 mph13 km/h SouthwestDrizzle
10pm53°F12°C9 mph15 km/h SouthwestDrizzle
11pm54°F12°C9 mph15 km/h SouthwestDrizzle
May 24
12am55°F13°C9 mph15 km/h SouthwestDrizzle
1am56°F13°C9 mph15 km/h SouthwestDrizzle
2am57°F14°C9 mph15 km/h SouthwestCloudy
3am59°F15°C10 mph15 km/h SouthwestCloudy
4am60°F16°C11 mph17 km/h WestCloudy
5am62°F17°C12 mph19 km/h WestCloudy
6am64°F18°C12 mph20 km/h WestCloudy
7am66°F19°C13 mph20 km/h WestCloudy
DateLowHighWindDayNight
May 2353°F12°C69°F20°C13 mph21 km/h from SouthwestDrizzleDrizzle
May 2451°F10°C61°F16°C16 mph26 km/h from WestWindyMostly Clear
May 2548°F9°C60°F16°C14 mph22 km/h from SouthwestMostly CloudyDrizzle
May 2652°F11°C62°F17°C14 mph22 km/h from SouthwestDrizzleDrizzle
May 2752°F11°C64°F18°C14 mph22 km/h from WestDrizzleMostly Cloudy
May 2851°F11°C65°F18°C13 mph20 km/h from WestDrizzleMostly Cloudy
May 2951°F11°C68°F20°C10 mph16 km/h from WestDrizzlePartly Cloudy

Yes

Low of 51°F11°C, High of 62°F17°C
Wind: 16 mph26 km/h
Precipitation: 24% rain

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