Yes

you do need a jacket based on the weather in Seaham SR7, UK 1 second ago

Why? Because it's not very warm out!
58°F14°C & Mostly Cloudy

Wind is 8 mph13 km/h from the West, gusting to 18 mph29 km/h
June 6
10am59°F15°C7 mph12 km/h WestDrizzle
11am60°F15°C9 mph14 km/h WestPartly Cloudy
12pm60°F15°C10 mph16 km/h WestPartly Cloudy
1pm59°F15°C9 mph15 km/h WestPartly Cloudy
2pm59°F15°C9 mph14 km/h SouthwestMostly Cloudy
3pm57°F14°C8 mph13 km/h SouthwestCloudy
4pm55°F13°C7 mph12 km/h SouthwestCloudy
5pm53°F11°C8 mph13 km/h SouthwestCloudy
6pm51°F11°C7 mph11 km/h SouthwestCloudy
7pm49°F10°C6 mph10 km/h SouthwestMostly Cloudy
8pm48°F9°C7 mph11 km/h SouthwestMostly Cloudy
9pm48°F9°C7 mph11 km/h SouthwestCloudy
DateLowHighWindDayNight
June 546°F8°C60°F15°C7 mph11 km/h from WestDrizzleCloudy
June 648°F9°C56°F14°C7 mph12 km/h from WestDrizzleRain
June 746°F8°C59°F15°C12 mph19 km/h from WestPartly CloudyMostly Clear
June 847°F8°C62°F17°C11 mph18 km/h from WestMostly CloudyDrizzle
June 953°F11°C64°F18°C9 mph14 km/h from WestCloudyPartly Cloudy
June 1053°F12°C67°F20°C8 mph13 km/h from SoutheastPartly CloudyPartly Cloudy
June 1154°F12°C68°F20°C12 mph20 km/h from SoutheastDrizzleRain

Yes

Low of 48°F9°C, High of 56°F14°C
Wind: 7 mph12 km/h
Precipitation: 65% rain

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