Yes

you do need a jacket based on the weather in Heslington, York YO10 5DD, UK 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's on the windy side!
56°F13°C & Partly Cloudy

Wind is 13 mph21 km/h from the West, gusting to 24 mph39 km/h
August 5
3am58°F14°C15 mph25 km/h WestWindy
4am59°F15°C18 mph29 km/h WestWindy
5am61°F16°C19 mph31 km/h WestWindy
6am62°F17°C20 mph32 km/h WestWindy
7am64°F18°C21 mph34 km/h WestWindy
8am65°F18°C22 mph35 km/h WestWindy
9am66°F19°C22 mph35 km/h WestWindy
10am67°F19°C22 mph35 km/h WestWindy
11am67°F19°C22 mph35 km/h WestWindy
12pm67°F20°C21 mph33 km/h WestWindy
1pm67°F19°C19 mph31 km/h WestWindy
2pm65°F18°C17 mph28 km/h WestWindy
DateLowHighWindDayNight
August 455°F13°C67°F20°C20 mph32 km/h from WestWindyClear
August 553°F11°C71°F22°C11 mph17 km/h from WestPartly CloudyMostly Cloudy
August 654°F12°C71°F22°C15 mph24 km/h from SouthwestWindyPartly Cloudy
August 755°F13°C71°F22°C11 mph18 km/h from WestPartly CloudyMostly Clear
August 854°F12°C71°F22°C10 mph17 km/h from WestPartly CloudyPartly Cloudy
August 954°F12°C77°F25°C10 mph17 km/h from SouthPartly CloudyPartly Cloudy
August 1057°F14°C67°F19°C13 mph21 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 53°F12°C, High of 72°F22°C
Wind: 11 mph17 km/h
Precipitation: None

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