Yes

you do need a jacket based on the weather in St. John's, NL, Canada 1 second ago

Why? Because it's cool. Pleasantly cool, but cool and it's really really huffing out there!
58°F15°C & Windy

Wind is 16 mph26 km/h from the Southwest, gusting to 32 mph51 km/h
June 1
8pm57°F14°C16 mph26 km/h SouthwestWindy
9pm56°F14°C15 mph24 km/h SouthwestCloudy
10pm56°F13°C14 mph23 km/h SouthwestMostly Cloudy
11pm55°F13°C14 mph23 km/h SouthwestMostly Cloudy
June 2
12am54°F12°C13 mph21 km/h SouthwestMostly Cloudy
1am53°F12°C13 mph20 km/h SouthwestMostly Cloudy
2am53°F11°C12 mph19 km/h SouthwestMostly Cloudy
3am52°F11°C11 mph18 km/h SouthwestMostly Cloudy
4am52°F11°C11 mph18 km/h SouthwestCloudy
5am52°F11°C10 mph17 km/h SouthwestCloudy
6am53°F12°C10 mph16 km/h SouthwestCloudy
7am55°F13°C10 mph16 km/h SouthwestCloudy
DateLowHighWindDayNight
May 3154°F12°C68°F20°C10 mph16 km/h from SouthwestDrizzleMostly Cloudy
June 152°F11°C65°F18°C11 mph17 km/h from SouthwestMostly CloudyMostly Cloudy
June 247°F9°C65°F18°C9 mph14 km/h from SouthwestMostly CloudyPartly Cloudy
June 347°F8°C65°F18°C7 mph11 km/h from SouthwestMostly CloudyMostly Clear
June 450°F10°C71°F22°C11 mph18 km/h from SouthwestMostly ClearMostly Cloudy
June 553°F11°C68°F20°C9 mph15 km/h from SouthMostly CloudyMostly Cloudy
June 649°F9°C60°F16°C8 mph13 km/h from SouthwestCloudyCloudy

Yes

Low of 52°F11°C, High of 64°F18°C
Wind: 11 mph17 km/h
Precipitation: None

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