Yes

you do need a jacket based on the weather in Brunswick Square, London WC1N 1AQ, UK 1 second ago

Why? Because a jacket will keep you cozy, but you won't break a seat and it's so windy, your hat will probably launch into orbit!
54°F12°C & Mostly Cloudy

Wind is 12 mph19 km/h from the North, gusting to 26 mph42 km/h
May 4
2pm54°F12°C12 mph19 km/h NorthPartly Cloudy
3pm52°F11°C12 mph19 km/h NorthPartly Cloudy
4pm50°F10°C10 mph17 km/h NorthPartly Cloudy
5pm49°F9°C9 mph15 km/h NorthPartly Cloudy
6pm47°F8°C9 mph15 km/h NorthPartly Cloudy
7pm46°F8°C9 mph15 km/h NorthPartly Cloudy
8pm45°F7°C9 mph14 km/h NorthPartly Cloudy
9pm44°F6°C9 mph14 km/h NorthPartly Cloudy
10pm43°F6°C8 mph14 km/h NorthPartly Cloudy
11pm43°F6°C9 mph14 km/h NorthPartly Cloudy
May 5
12am42°F6°C8 mph13 km/h NorthPartly Cloudy
1am42°F6°C8 mph13 km/h NorthCloudy
DateLowHighWindDayNight
May 346°F8°C57°F14°C8 mph12 km/h from NortheastMostly CloudyPartly Cloudy
May 442°F6°C57°F14°C13 mph20 km/h from NortheastMostly CloudyMostly Clear
May 543°F6°C60°F16°C9 mph14 km/h from NortheastPartly CloudyPartly Cloudy
May 644°F7°C61°F16°C9 mph15 km/h from NortheastCloudyMostly Cloudy
May 746°F8°C63°F17°C9 mph15 km/h from NortheastMostly CloudyClear
May 847°F8°C65°F19°C11 mph17 km/h from EastClearClear
May 948°F9°C68°F20°C9 mph15 km/h from EastMostly ClearMostly Clear

Yes

Low of 42°F6°C, High of 57°F14°C
Wind: 13 mph20 km/h
Precipitation: None

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