No

you don't need a jacket based on the weather in Wembley, UK 17 minutes ago

69°F20°C & Partly Cloudy

Wind is 5 mph8 km/h from the Southwest, gusting to 12 mph20 km/h
May 31
6am71°F21°C6 mph10 km/h SouthwestMostly Clear
7am73°F23°C7 mph11 km/h SouthwestPartly Cloudy
8am75°F24°C8 mph12 km/h SouthwestPartly Cloudy
9am76°F25°C8 mph13 km/h SouthwestMostly Cloudy
10am77°F25°C9 mph14 km/h SouthwestMostly Cloudy
11am77°F25°C10 mph16 km/h SouthwestCloudy
12pm76°F24°C11 mph18 km/h SouthwestCloudy
1pm74°F23°C11 mph18 km/h SouthwestCloudy
2pm72°F22°C11 mph18 km/h SouthwestCloudy
3pm70°F21°C10 mph16 km/h SouthwestCloudy
4pm67°F19°C9 mph14 km/h SouthwestMostly Cloudy
5pm65°F18°C8 mph13 km/h WestMostly Cloudy
DateLowHighWindDayNight
May 3060°F15°C77°F25°C7 mph12 km/h from SouthwestMostly CloudyPartly Cloudy
May 3155°F13°C69°F21°C12 mph20 km/h from WestPartly CloudyMostly Clear
June 151°F10°C69°F21°C7 mph11 km/h from WestMostly ClearMostly Cloudy
June 251°F11°C65°F18°C14 mph22 km/h from SouthwestDrizzlePartly Cloudy
June 349°F9°C64°F18°C10 mph16 km/h from SouthwestPartly CloudyMostly Cloudy
June 449°F10°C63°F17°C11 mph18 km/h from SouthwestDrizzleDrizzle
June 551°F11°C66°F19°C10 mph17 km/h from WestRainMostly Cloudy

Yes

Low of 55°F13°C, High of 69°F21°C
Wind: 12 mph20 km/h
Precipitation: None

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