Yes

you do need a jacket based on the weather in Eastport, ME, USA 1 second ago

Why? Because it's not very warm out!
52°F11°C & Cloudy

Wind is 7 mph11 km/h from the Southwest, gusting to 14 mph22 km/h
September 22
4am53°F11°C7 mph12 km/h SouthwestMostly Cloudy
5am52°F11°C7 mph11 km/h SouthwestMostly Cloudy
6am52°F11°C6 mph10 km/h SouthwestPartly Cloudy
7am52°F11°C6 mph10 km/h SouthwestPartly Cloudy
8am54°F12°C6 mph10 km/h SouthwestPartly Cloudy
9am56°F13°C7 mph11 km/h SouthwestPartly Cloudy
10am58°F15°C6 mph10 km/h SouthwestPartly Cloudy
11am60°F15°C8 mph13 km/h SouthMostly Clear
12pm60°F16°C9 mph15 km/h SouthPartly Cloudy
1pm61°F16°C11 mph18 km/h SouthPartly Cloudy
2pm61°F16°C12 mph19 km/h SouthMostly Clear
3pm61°F16°C12 mph20 km/h SouthMostly Clear
DateLowHighWindDayNight
September 2251°F11°C61°F16°C10 mph15 km/h from SouthMostly ClearPartly Cloudy
September 2356°F13°C62°F16°C6 mph9 km/h from SouthwestDrizzleDrizzle
September 2456°F13°C60°F16°C9 mph14 km/h from EastPartly CloudyPartly Cloudy
September 2554°F12°C61°F16°C7 mph12 km/h from SoutheastDrizzleRain
September 2657°F14°C63°F17°C9 mph15 km/h from SouthwestRainMostly Cloudy
September 2757°F14°C62°F17°C6 mph9 km/h from EastPartly CloudyPartly Cloudy
September 2855°F13°C65°F19°C11 mph18 km/h from WestPartly CloudyMostly Clear

Yes

Low of 55°F13°C, High of 62°F17°C
Wind: 6 mph9 km/h
Precipitation: 37% rain

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