No

you don't need a jacket based on the weather in London, UK 20 minutes ago

70°F21°C & Partly Cloudy

Wind is 7 mph12 km/h from the North, gusting to 19 mph30 km/h
August 21
12pm70°F21°C8 mph14 km/h NorthPartly Cloudy
1pm68°F20°C9 mph14 km/h NorthPartly Cloudy
2pm67°F19°C9 mph14 km/h NorthPartly Cloudy
3pm65°F18°C7 mph12 km/h NortheastMostly Cloudy
4pm63°F17°C7 mph11 km/h NortheastMostly Cloudy
5pm62°F17°C6 mph10 km/h NortheastPartly Cloudy
6pm61°F16°C6 mph9 km/h NortheastMostly Clear
7pm59°F15°C5 mph8 km/h NortheastMostly Clear
8pm58°F15°C4 mph7 km/h NortheastClear
9pm57°F14°C3 mph5 km/h NortheastClear
10pm56°F14°C2 mph4 km/h NorthClear
11pm56°F13°C2 mph4 km/h NorthwestClear
DateLowHighWindDayNight
August 2058°F14°C70°F21°C6 mph10 km/h from NorthMostly CloudyMostly Clear
August 2154°F12°C72°F22°C4 mph6 km/h from WestPartly CloudyMostly Cloudy
August 2258°F14°C69°F20°C5 mph7 km/h from NortheastCloudyPartly Cloudy
August 2356°F13°C72°F22°C5 mph8 km/h from EastMostly ClearMostly Clear
August 2454°F12°C74°F23°C5 mph8 km/h from SoutheastPartly CloudyMostly Clear
August 2558°F14°C77°F25°C7 mph12 km/h from SouthMostly CloudyPartly Cloudy
August 2660°F16°C72°F22°C7 mph11 km/h from SouthwestMostly CloudyMostly Cloudy

Yes

Low of 55°F13°C, High of 73°F23°C
Wind: 4 mph6 km/h
Precipitation: None

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