Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
56°F14°C & Mostly Cloudy

Wind is 7 mph12 km/h from the South, gusting to 16 mph25 km/h
August 28
4am58°F14°C9 mph14 km/h SouthMostly Cloudy
5am60°F16°C9 mph15 km/h SouthMostly Cloudy
6am63°F17°C11 mph17 km/h SouthMostly Cloudy
7am64°F18°C13 mph20 km/h SouthMostly Cloudy
8am65°F18°C14 mph22 km/h SouthMostly Cloudy
9am66°F19°C13 mph22 km/h SouthCloudy
10am65°F18°C13 mph21 km/h SouthwestCloudy
11am64°F18°C12 mph20 km/h SouthwestDrizzle
12pm64°F18°C12 mph20 km/h SouthwestCloudy
1pm63°F17°C10 mph16 km/h SouthwestCloudy
2pm62°F17°C10 mph17 km/h SouthwestCloudy
3pm60°F16°C9 mph15 km/h SouthwestCloudy
DateLowHighWindDayNight
August 2753°F12°C66°F19°C11 mph18 km/h from SouthDrizzleDrizzle
August 2852°F11°C66°F19°C9 mph14 km/h from SouthwestPartly CloudyMostly Clear
August 2953°F12°C65°F18°C13 mph20 km/h from SouthDrizzleDrizzle
August 3055°F13°C67°F20°C17 mph28 km/h from SouthWindyMostly Clear
August 3154°F12°C66°F19°C13 mph21 km/h from SouthwestDrizzlePartly Cloudy
September 151°F11°C64°F18°C8 mph12 km/h from SouthwestPartly CloudyMostly Clear
September 248°F9°C65°F18°C6 mph9 km/h from SoutheastRainDrizzle

Yes

Low of 53°F12°C, High of 66°F19°C
Wind: 9 mph14 km/h
Precipitation: 29% rain

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