Yes

you do need a jacket based on the weather in Wantage OX12, UK 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and the wind could blow a wig clean off your head!
57°F14°C & Cloudy

Wind is 11 mph18 km/h from the Southeast, gusting to 20 mph32 km/h
October 18
4pm57°F14°C11 mph19 km/h SoutheastCloudy
5pm55°F13°C11 mph17 km/h SoutheastCloudy
6pm54°F12°C10 mph16 km/h SoutheastCloudy
7pm54°F12°C10 mph16 km/h SoutheastCloudy
8pm53°F12°C10 mph16 km/h SoutheastCloudy
9pm53°F11°C10 mph16 km/h SoutheastCloudy
10pm52°F11°C11 mph17 km/h SoutheastCloudy
11pm53°F11°C11 mph18 km/h SoutheastCloudy
October 19
12am53°F11°C10 mph17 km/h SoutheastCloudy
1am53°F11°C11 mph17 km/h SoutheastCloudy
2am53°F12°C10 mph17 km/h SoutheastCloudy
3am53°F12°C11 mph17 km/h SoutheastCloudy
DateLowHighWindDayNight
October 1750°F10°C58°F14°C10 mph17 km/h from SoutheastCloudyDrizzle
October 1853°F11°C60°F16°C16 mph25 km/h from SoutheastRainMostly Cloudy
October 1953°F11°C58°F14°C16 mph26 km/h from SouthRainDrizzle
October 2050°F10°C58°F14°C13 mph22 km/h from SouthwestDrizzlePartly Cloudy
October 2147°F8°C56°F13°C9 mph14 km/h from SouthRainRain
October 2246°F8°C53°F12°C22 mph36 km/h from SouthwestDrizzleWindy
October 2342°F5°C51°F11°C17 mph27 km/h from WestWindyMostly Cloudy

Yes

Low of 53°F12°C, High of 60°F16°C
Wind: 16 mph25 km/h
Precipitation: 87% rain

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