Yes

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

Why? Because the air feels like the cozy middle ground between summer and winter!
58°F14°C & Clear

Wind is 6 mph10 km/h from the Southwest, gusting to 13 mph21 km/h
September 4
4pm58°F14°C6 mph10 km/h SouthwestClear
5pm57°F14°C6 mph9 km/h SouthwestClear
6pm56°F13°C5 mph9 km/h SouthwestClear
7pm55°F13°C5 mph9 km/h SouthwestClear
8pm54°F12°C5 mph9 km/h SouthwestMostly Clear
9pm54°F12°C5 mph8 km/h SouthwestClear
10pm53°F12°C5 mph7 km/h SouthwestClear
11pm53°F12°C4 mph7 km/h SouthwestClear
September 5
12am52°F11°C4 mph7 km/h SouthwestClear
1am52°F11°C5 mph7 km/h SouthwestClear
2am53°F11°C4 mph7 km/h SouthwestClear
3am55°F13°C5 mph8 km/h SouthwestClear
DateLowHighWindDayNight
September 355°F13°C67°F20°C5 mph8 km/h from WestRainClear
September 452°F11°C68°F20°C8 mph12 km/h from SouthwestPartly CloudyCloudy
September 555°F13°C70°F21°C13 mph21 km/h from SoutheastCloudyWindy
September 658°F14°C70°F21°C14 mph23 km/h from SouthRainMostly Clear
September 755°F13°C68°F20°C17 mph27 km/h from SouthWindyDrizzle
September 855°F13°C67°F19°C14 mph22 km/h from SouthPartly CloudyDrizzle
September 954°F12°C64°F18°C11 mph18 km/h from SouthwestDrizzleRain

Yes

Low of 52°F11°C, High of 68°F20°C
Wind: 8 mph12 km/h
Precipitation: None

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