No

you don't need a jacket based on the weather in London, UK 3 minutes ago

61°F16°C & Cloudy

Wind is 4 mph7 km/h from the Southwest, gusting to 11 mph18 km/h
August 27
8pm61°F16°C5 mph8 km/h SouthwestMostly Cloudy
9pm60°F16°C4 mph7 km/h SouthwestMostly Cloudy
10pm59°F15°C4 mph6 km/h SouthwestPartly Cloudy
11pm58°F14°C3 mph5 km/h SouthwestMostly Clear
August 28
12am57°F14°C3 mph5 km/h SouthwestClear
1am56°F13°C3 mph5 km/h SouthwestClear
2am56°F13°C4 mph6 km/h SouthwestClear
3am58°F14°C4 mph7 km/h SouthwestMostly Clear
4am60°F16°C7 mph11 km/h SouthwestMostly Clear
5am63°F17°C9 mph14 km/h SouthwestPartly Cloudy
6am64°F18°C10 mph16 km/h SouthwestMostly Cloudy
7am65°F18°C11 mph18 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
August 2756°F13°C67°F19°C10 mph16 km/h from SouthwestDrizzleRain
August 2858°F14°C68°F20°C8 mph12 km/h from WestRainMostly Clear
August 2956°F13°C69°F20°C11 mph18 km/h from SouthwestDrizzleDrizzle
August 3058°F14°C67°F20°C13 mph21 km/h from SouthwestMostly ClearPartly Cloudy
August 3157°F14°C66°F19°C9 mph14 km/h from SouthwestDrizzleDrizzle
September 154°F12°C66°F19°C8 mph13 km/h from SouthwestDrizzleDrizzle
September 257°F14°C66°F19°C8 mph12 km/h from SouthDrizzleThunderstorms

Yes

Low of 58°F15°C, High of 68°F20°C
Wind: 8 mph12 km/h
Precipitation: 69% rain

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