Yes

you do need a jacket based on the weather in London Borough of Sutton, UK 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
53°F12°C & Cloudy

Wind is 7 mph12 km/h from the East, gusting to 17 mph27 km/h
March 20
6pm53°F12°C8 mph12 km/h EastCloudy
7pm52°F11°C8 mph12 km/h EastCloudy
8pm51°F11°C7 mph12 km/h EastCloudy
9pm51°F11°C7 mph12 km/h EastCloudy
10pm51°F10°C7 mph11 km/h EastCloudy
11pm50°F10°C8 mph12 km/h EastCloudy
March 21
12am50°F10°C8 mph13 km/h EastCloudy
1am50°F10°C8 mph12 km/h EastCloudy
2am50°F10°C8 mph14 km/h EastCloudy
3am50°F10°C9 mph15 km/h EastCloudy
4am52°F11°C10 mph15 km/h EastCloudy
5am54°F12°C10 mph17 km/h EastCloudy
DateLowHighWindDayNight
March 1944°F7°C67°F19°C4 mph7 km/h from SoutheastMostly ClearMostly Cloudy
March 2050°F10°C61°F16°C11 mph18 km/h from SoutheastRainRain
March 2148°F9°C57°F14°C7 mph11 km/h from SouthDrizzleDrizzle
March 2246°F8°C57°F14°C6 mph9 km/h from NorthRainPartly Cloudy
March 2344°F7°C56°F13°C7 mph11 km/h from NorthMostly CloudyMostly Cloudy
March 2442°F6°C55°F13°C5 mph8 km/h from NorthwestMostly CloudyMostly Cloudy
March 2542°F6°C55°F13°C5 mph8 km/h from NorthMostly CloudyPartly Cloudy

Yes

Low of 50°F10°C, High of 62°F17°C
Wind: 11 mph18 km/h
Precipitation: 36% rain

Support This Page