Yes

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

Why? Because it's not very warm out and it's really really huffing out there!
53°F12°C & Windy

Wind is 16 mph26 km/h from the South, gusting to 32 mph51 km/h
October 30
10pm53°F12°C17 mph28 km/h SouthWindy
11pm54°F12°C18 mph29 km/h SouthDrizzle
October 31
12am55°F13°C18 mph29 km/h SouthDrizzle
1am55°F13°C17 mph28 km/h SouthDrizzle
2am55°F13°C16 mph25 km/h SouthWindy
3am55°F13°C14 mph23 km/h SouthMostly Cloudy
4am55°F13°C14 mph22 km/h SouthMostly Cloudy
5am55°F13°C12 mph20 km/h SouthCloudy
6am55°F13°C12 mph19 km/h SouthCloudy
7am55°F13°C12 mph19 km/h SouthCloudy
8am55°F13°C13 mph21 km/h SouthCloudy
9am56°F14°C14 mph22 km/h SouthCloudy
DateLowHighWindDayNight
October 3039°F4°C55°F13°C4 mph6 km/h from SouthCloudyDrizzle
October 3155°F13°C59°F15°C16 mph25 km/h from SouthDrizzleRain
November 145°F7°C56°F13°C13 mph21 km/h from SouthwestDrizzleRain
November 244°F7°C52°F11°C11 mph17 km/h from WestRainDrizzle
November 347°F8°C58°F15°C18 mph29 km/h from SouthwestWindyDrizzle
November 454°F12°C58°F14°C15 mph24 km/h from SouthRainRain
November 552°F11°C56°F13°C12 mph19 km/h from SouthRainDrizzle

Yes

Low of 55°F13°C, High of 59°F15°C
Wind: 16 mph25 km/h
Precipitation: 76% rain

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