Yes

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

Why? Because a jacket will keep you cozy, but you won't break a seat and it's fairly windy outside!
55°F13°C & Mostly Cloudy

Wind is 11 mph17 km/h from the South, gusting to 21 mph33 km/h
July 15
1am55°F13°C11 mph18 km/h SouthMostly Cloudy
2am56°F14°C13 mph20 km/h SouthMostly Cloudy
3am58°F15°C14 mph23 km/h SouthMostly Cloudy
4am61°F16°C16 mph25 km/h SouthwestWindy
5am62°F17°C17 mph27 km/h SouthwestWindy
6am62°F17°C15 mph25 km/h SouthwestDrizzle
7am62°F17°C16 mph26 km/h SouthwestRain
8am63°F17°C16 mph26 km/h SouthwestRain
9am63°F17°C17 mph28 km/h SouthwestDrizzle
10am63°F17°C18 mph29 km/h SouthwestDrizzle
11am63°F17°C18 mph28 km/h SouthwestDrizzle
12pm64°F18°C17 mph28 km/h SouthwestWindy
DateLowHighWindDayNight
July 1454°F12°C64°F18°C16 mph26 km/h from SouthwestRainDrizzle
July 1556°F13°C72°F22°C9 mph15 km/h from NorthwestMostly CloudyPartly Cloudy
July 1655°F13°C75°F24°C5 mph8 km/h from SouthMostly CloudyMostly Cloudy
July 1761°F16°C77°F25°C6 mph9 km/h from SouthwestPartly CloudyRain
July 1860°F16°C70°F21°C7 mph11 km/h from SoutheastRainDrizzle
July 1958°F14°C68°F20°C7 mph12 km/h from SouthRainDrizzle
July 2056°F13°C71°F21°C6 mph9 km/h from WestDrizzleMostly Clear

Yes

Low of 55°F13°C, High of 73°F23°C
Wind: 9 mph15 km/h
Precipitation: 5% rain

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