Yes

you do need a jacket based on the weather in Westminster, London SW1, UK 1 second ago

Why? Because it's on the windy side!
66°F19°C & Mostly Cloudy

Wind is 9 mph14 km/h from the West, gusting to 21 mph33 km/h
May 23
10am66°F19°C9 mph15 km/h WestMostly Cloudy
11am67°F19°C10 mph16 km/h WestMostly Cloudy
12pm65°F18°C11 mph17 km/h SouthwestMostly Cloudy
1pm64°F18°C10 mph15 km/h SouthwestMostly Cloudy
2pm62°F17°C10 mph17 km/h SouthwestCloudy
3pm60°F16°C10 mph16 km/h SouthwestCloudy
4pm58°F15°C9 mph14 km/h SouthwestCloudy
5pm57°F14°C9 mph14 km/h SouthwestCloudy
6pm56°F13°C8 mph13 km/h SouthwestCloudy
7pm56°F13°C8 mph12 km/h SouthwestCloudy
8pm55°F13°C7 mph11 km/h SouthwestCloudy
9pm55°F13°C7 mph11 km/h SouthwestCloudy
DateLowHighWindDayNight
May 2243°F6°C67°F19°C6 mph10 km/h from WestPartly CloudyRain
May 2354°F12°C71°F22°C11 mph18 km/h from WestDrizzleCloudy
May 2454°F12°C66°F19°C14 mph22 km/h from WestPartly CloudyMostly Clear
May 2551°F10°C63°F17°C12 mph19 km/h from SouthwestMostly CloudyCloudy
May 2655°F13°C64°F18°C12 mph20 km/h from SouthwestDrizzleDrizzle
May 2755°F13°C67°F20°C12 mph19 km/h from WestRainMostly Cloudy
May 2853°F12°C69°F20°C9 mph15 km/h from WestMostly CloudyMostly Cloudy

Yes

Low of 54°F12°C, High of 71°F22°C
Wind: 11 mph18 km/h
Precipitation: 56% rain

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