Yes

you do need a jacket based on the weather in (Nine Elms), England, United Kingdom 1 second ago

Why? Because it's cold enough that makes you wish you had a hat, but you're still too proud to admit it and it's so windy, your hat has officially retired from your head!
49°F9°C & Clear

Wind is 9 mph14 km/h from the West, gusting to 21 mph34 km/h
June 8
12am49°F9°C9 mph14 km/h WestClear
1am48°F9°C9 mph14 km/h WestClear
2am50°F10°C9 mph14 km/h WestClear
3am52°F11°C10 mph17 km/h WestClear
4am54°F12°C11 mph18 km/h WestMostly Clear
5am56°F14°C11 mph19 km/h WestMostly Clear
6am58°F15°C11 mph18 km/h WestPartly Cloudy
7am60°F16°C11 mph18 km/h WestPartly Cloudy
8am61°F16°C11 mph17 km/h WestMostly Cloudy
9am62°F17°C10 mph16 km/h WestMostly Cloudy
10am64°F18°C10 mph17 km/h WestMostly Cloudy
11am64°F18°C11 mph17 km/h WestMostly Cloudy
DateLowHighWindDayNight
June 748°F9°C64°F18°C11 mph17 km/h from WestPartly CloudyMostly Clear
June 850°F10°C67°F20°C7 mph11 km/h from SouthwestMostly CloudyMostly Cloudy
June 954°F12°C71°F22°C8 mph13 km/h from WestMostly CloudyMostly Clear
June 1055°F13°C77°F25°C6 mph9 km/h from SoutheastPartly CloudyMostly Cloudy
June 1161°F16°C76°F24°C7 mph12 km/h from SouthDrizzlePartly Cloudy
June 1261°F16°C80°F27°C7 mph12 km/h from SouthThunderstormsThunderstorms
June 1359°F15°C75°F24°C7 mph11 km/h from SouthwestRainMostly Clear

Yes

Low of 50°F10°C, High of 67°F20°C
Wind: 7 mph11 km/h
Precipitation: None

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