Yes

you do need a jacket based on the weather in Conway (North Conway), New Hampshire, United States 1 second ago

Why? Because it's cold. simple as that.
48°F9°C & Drizzle

Wind is 4 mph7 km/h from the S, gusting to 11 mph17 km/h
April 24
11am49°F10°C6 mph9 km/h SDrizzle
12pm50°F10°C6 mph9 km/h SWDrizzle
1pm52°F11°C6 mph9 km/h SWCloudy
2pm54°F12°C7 mph11 km/h WCloudy
3pm53°F12°C8 mph13 km/h WCloudy
4pm50°F10°C12 mph19 km/h NWMostly Cloudy
5pm47°F8°C12 mph19 km/h NWPartly Cloudy
6pm44°F7°C12 mph19 km/h NWMostly Clear
7pm40°F5°C11 mph18 km/h NWMostly Clear
8pm37°F3°C10 mph16 km/h NWClear
9pm35°F1°C9 mph15 km/h NWClear
10pm33°F0°C9 mph15 km/h NWClear
DateLowHighWindDayNight
April 2430°F-1°C54°F12°C7 mph11 km/h from WDrizzleClear
April 2524°F-5°C51°F10°C5 mph9 km/h from NWClearClear
April 2627°F-3°C57°F14°C2 mph4 km/h from SMostly ClearClear
April 2730°F-1°C63°F17°C6 mph9 km/h from SPartly CloudyCloudy
April 2842°F6°C69°F20°C5 mph8 km/h from SWMostly CloudyMostly Cloudy
April 2950°F10°C70°F21°C3 mph5 km/h from SEMostly CloudyMostly Cloudy
April 3050°F10°C69°F20°C6 mph9 km/h from SDrizzleRain

Yes

Low of 24°F-5°C, High of 51°F11°C
Wind: 5 mph9 km/h
Precipitation: None

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