Yes

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

Why? Because it's pretty chilly and it's so gusty, you’re basically doing accidental parkour!
55°F13°C & Mostly Clear

Wind is 11 mph18 km/h from the Southwest, gusting to 21 mph34 km/h
September 10
8pm55°F13°C11 mph18 km/h SouthwestMostly Clear
9pm54°F12°C11 mph18 km/h SouthwestMostly Clear
10pm53°F12°C11 mph17 km/h SouthwestPartly Cloudy
11pm53°F12°C11 mph18 km/h SouthwestMostly Clear
September 11
12am52°F11°C11 mph17 km/h SouthwestPartly Cloudy
1am52°F11°C11 mph17 km/h SouthwestMostly Cloudy
2am53°F11°C10 mph17 km/h SouthwestPartly Cloudy
3am54°F12°C11 mph18 km/h SouthwestPartly Cloudy
4am56°F13°C13 mph21 km/h SouthwestPartly Cloudy
5am58°F15°C15 mph24 km/h SouthwestPartly Cloudy
6am60°F16°C15 mph24 km/h SouthwestPartly Cloudy
7am62°F17°C16 mph26 km/h SouthwestWindy
DateLowHighWindDayNight
September 1052°F11°C62°F17°C15 mph23 km/h from SouthwestDrizzleDrizzle
September 1150°F10°C62°F17°C13 mph22 km/h from SouthwestDrizzleRain
September 1251°F11°C63°F17°C12 mph19 km/h from SouthwestDrizzlePartly Cloudy
September 1349°F9°C65°F18°C16 mph26 km/h from SouthThunderstormsThunderstorms
September 1454°F12°C62°F16°C23 mph36 km/h from SouthwestThunderstormsWindy
September 1551°F11°C62°F17°C16 mph25 km/h from WestWindyMostly Cloudy
September 1649°F10°C65°F18°C15 mph24 km/h from SouthwestThunderstormsMostly Cloudy

Yes

Low of 50°F10°C, High of 63°F17°C
Wind: 13 mph22 km/h
Precipitation: 41% rain

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