Yes

you do need a jacket based on the weather in Croydon, UK 15 minutes ago

Why? Because it's cool. Pleasantly cool, but cool.
54°F12°C & Windy

Wind is 15 mph24 km/h from the NW, gusting to 32 mph51 km/h
April 19
7am54°F12°C16 mph25 km/h NWDrizzle
8am55°F13°C15 mph24 km/h NWMostly Cloudy
9am56°F13°C14 mph22 km/h NWMostly Cloudy
10am57°F14°C14 mph22 km/h NWMostly Cloudy
11am56°F14°C13 mph22 km/h NMostly Cloudy
12pm55°F13°C13 mph21 km/h NMostly Cloudy
1pm53°F12°C12 mph20 km/h NMostly Cloudy
2pm51°F11°C11 mph17 km/h NMostly Cloudy
3pm49°F9°C10 mph17 km/h NEMostly Cloudy
4pm47°F8°C10 mph16 km/h NEMostly Cloudy
5pm46°F8°C9 mph14 km/h NPartly Cloudy
6pm44°F7°C8 mph13 km/h NMostly Clear
DateLowHighWindDayNight
April 1842°F6°C57°F14°C14 mph22 km/h from NWDrizzleMostly Clear
April 1937°F3°C52°F11°C11 mph17 km/h from NPartly CloudyMostly Clear
April 2036°F2°C52°F11°C11 mph17 km/h from NPartly CloudyPartly Cloudy
April 2138°F3°C52°F11°C9 mph15 km/h from NMostly CloudyMostly Cloudy
April 2240°F5°C51°F11°C9 mph14 km/h from NEMostly CloudyMostly Cloudy
April 2339°F4°C53°F12°C10 mph16 km/h from NMostly CloudyPartly Cloudy
April 2439°F4°C54°F12°C7 mph11 km/h from NMostly CloudyMostly Cloudy

Yes

Low of 37°F3°C, High of 52°F11°C
Wind: 11 mph17 km/h
Precipitation: None

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