Yes

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

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
49°F9°C & Clear

Wind is 5 mph8 km/h from the Southeast, gusting to 9 mph14 km/h
September 9
1am48°F9°C5 mph8 km/h SoutheastClear
2am49°F9°C5 mph9 km/h SoutheastClear
3am51°F11°C6 mph9 km/h SoutheastClear
4am55°F13°C6 mph10 km/h SouthMostly Clear
5am58°F15°C7 mph11 km/h SouthClear
6am62°F17°C8 mph13 km/h SouthClear
7am64°F18°C9 mph14 km/h SouthMostly Clear
8am66°F19°C10 mph16 km/h SouthMostly Clear
9am68°F20°C11 mph18 km/h SouthMostly Clear
10am68°F20°C12 mph19 km/h SouthMostly Clear
11am69°F20°C11 mph18 km/h SouthPartly Cloudy
12pm68°F20°C11 mph17 km/h SouthPartly Cloudy
DateLowHighWindDayNight
September 848°F9°C69°F20°C9 mph14 km/h from SouthMostly ClearMostly Cloudy
September 954°F12°C67°F19°C13 mph22 km/h from SouthRainRain
September 1050°F10°C62°F17°C14 mph23 km/h from SouthwestDrizzlePartly Cloudy
September 1149°F9°C62°F17°C13 mph20 km/h from SouthwestDrizzlePartly Cloudy
September 1250°F10°C62°F17°C13 mph21 km/h from SouthwestDrizzleMostly Clear
September 1347°F8°C62°F17°C14 mph22 km/h from SouthDrizzleDrizzle
September 1454°F12°C64°F18°C23 mph37 km/h from SouthwestDrizzleWindy

Yes

Low of 55°F13°C, High of 66°F19°C
Wind: 13 mph22 km/h
Precipitation: 44% rain

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