Yes

you do need a jacket based on the weather in Falmouth, UK 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
53°F12°C & Mostly Cloudy

Wind is 5 mph8 km/h from the West, gusting to 8 mph13 km/h
June 9
1am53°F12°C5 mph8 km/h WestMostly Cloudy
2am55°F13°C5 mph8 km/h WestMostly Cloudy
3am57°F14°C5 mph9 km/h WestMostly Cloudy
4am58°F15°C7 mph11 km/h SouthwestCloudy
5am60°F15°C8 mph13 km/h SouthwestCloudy
6am60°F16°C9 mph14 km/h SouthwestCloudy
7am61°F16°C10 mph17 km/h SouthwestCloudy
8am61°F16°C11 mph18 km/h SouthwestCloudy
9am61°F16°C12 mph19 km/h SouthwestCloudy
10am61°F16°C12 mph19 km/h SouthwestMostly Cloudy
11am62°F17°C12 mph19 km/h SouthwestMostly Cloudy
12pm62°F16°C12 mph19 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
June 853°F12°C62°F17°C10 mph16 km/h from SouthwestMostly CloudyMostly Cloudy
June 956°F14°C64°F18°C10 mph16 km/h from WestCloudyMostly Cloudy
June 1053°F12°C65°F18°C14 mph22 km/h from EastMostly CloudyDrizzle
June 1158°F15°C65°F19°C14 mph23 km/h from SouthDrizzleCloudy
June 1257°F14°C66°F19°C13 mph20 km/h from SouthRainPartly Cloudy
June 1354°F12°C65°F18°C14 mph22 km/h from SouthwestMostly ClearMostly Clear
June 1453°F12°C65°F18°C12 mph19 km/h from WestPartly CloudyPartly Cloudy

Yes

Low of 56°F14°C, High of 64°F18°C
Wind: 10 mph16 km/h
Precipitation: 7% rain

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