Yes

you do need a jacket based on the weather in Portsmouth, NH 03801, USA 1 second ago

Why? Because the rain is just enough to ruin your hairstyle but not your mood and it's cool. Pleasantly cool, but cool!
55°F13°C & Rain

Wind is 7 mph12 km/h from the East, gusting to 12 mph20 km/h
May 6
2pm54°F12°C8 mph13 km/h EastRain
3pm54°F12°C8 mph13 km/h EastDrizzle
4pm54°F12°C8 mph13 km/h EastDrizzle
5pm53°F12°C7 mph12 km/h EastHaze
6pm53°F11°C8 mph12 km/h EastHaze
7pm52°F11°C7 mph11 km/h EastHaze
8pm53°F11°C6 mph10 km/h EastRain
9pm53°F12°C6 mph10 km/h EastRain
10pm53°F11°C6 mph9 km/h SoutheastRain
11pm53°F12°C6 mph10 km/h SoutheastDrizzle
May 7
12am53°F12°C6 mph9 km/h SoutheastFoggy
1am53°F12°C6 mph9 km/h SoutheastFoggy
DateLowHighWindDayNight
May 647°F8°C55°F13°C6 mph10 km/h from EastHeavy RainRain
May 753°F12°C65°F18°C7 mph11 km/h from SouthRainMostly Clear
May 852°F11°C67°F20°C5 mph9 km/h from NorthwestMostly CloudyRain
May 946°F8°C53°F11°C13 mph20 km/h from NortheastRainRain
May 1047°F8°C61°F16°C11 mph18 km/h from NorthwestRainMostly Clear
May 1149°F9°C66°F19°C10 mph16 km/h from NorthwestClearClear
May 1245°F7°C69°F21°C7 mph12 km/h from SouthwestMostly ClearClear

Yes

Low of 54°F12°C, High of 64°F18°C
Wind: 7 mph11 km/h
Precipitation: 46% rain

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