Yes

you do need a jacket based on the weather in Saint John, NB, Canada 1 second ago

Why? Because the air feels like the cozy middle ground between summer and winter!
56°F14°C & Clear

Wind is 4 mph6 km/h from the South, gusting to 5 mph8 km/h
September 15
10pm56°F13°C4 mph6 km/h SouthClear
11pm55°F13°C3 mph5 km/h SouthClear
September 16
12am55°F13°C2 mph3 km/h NorthwestClear
1am55°F13°C3 mph6 km/h NorthClear
2am54°F12°C4 mph7 km/h NorthClear
3am54°F12°C4 mph7 km/h NorthClear
4am53°F12°C4 mph7 km/h NorthClear
5am53°F12°C4 mph6 km/h NorthClear
6am54°F12°C4 mph6 km/h NorthClear
7am55°F13°C4 mph6 km/h NorthClear
8am59°F15°C4 mph6 km/h NorthClear
9am63°F17°C4 mph7 km/h NorthClear
DateLowHighWindDayNight
September 1449°F10°C72°F22°C6 mph9 km/h from WestClearClear
September 1553°F12°C73°F23°C4 mph6 km/h from NorthwestClearClear
September 1654°F12°C70°F21°C6 mph10 km/h from SouthwestMostly CloudyMostly Cloudy
September 1757°F14°C67°F20°C11 mph17 km/h from SouthwestMostly CloudyMostly Cloudy
September 1852°F11°C68°F20°C10 mph16 km/h from NorthwestPartly CloudyClear
September 1946°F8°C61°F16°C9 mph14 km/h from NorthwestClearClear
September 2046°F8°C64°F18°C10 mph15 km/h from SouthwestClearMostly Clear

Yes

Low of 53°F12°C, High of 73°F23°C
Wind: 4 mph6 km/h
Precipitation: None

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