Yes

you do need a jacket based on the weather in Devizes SN10, UK 1 second ago

Why? Because it's so windy, you’re practically horizontal just trying to walk!
60°F16°C & Windy

Wind is 15 mph24 km/h from the West, gusting to 26 mph42 km/h
June 6
11am60°F16°C15 mph24 km/h WestMostly Cloudy
12pm60°F15°C13 mph21 km/h WestCloudy
1pm59°F15°C12 mph19 km/h WestCloudy
2pm57°F14°C10 mph16 km/h WestCloudy
3pm56°F13°C8 mph12 km/h WestCloudy
4pm54°F12°C6 mph10 km/h SouthwestCloudy
5pm53°F11°C5 mph8 km/h SouthwestCloudy
6pm52°F11°C5 mph8 km/h SouthwestDrizzle
7pm51°F10°C5 mph8 km/h SouthDrizzle
8pm50°F10°C5 mph8 km/h SouthDrizzle
9pm50°F10°C5 mph8 km/h SouthwestDrizzle
10pm50°F10°C5 mph8 km/h SouthwestDrizzle
DateLowHighWindDayNight
June 550°F10°C61°F16°C12 mph19 km/h from WestDrizzleDrizzle
June 648°F9°C60°F15°C13 mph21 km/h from WestDrizzleMostly Clear
June 745°F7°C62°F17°C14 mph22 km/h from WestPartly CloudyMostly Clear
June 848°F9°C67°F20°C10 mph16 km/h from WestPartly CloudyPartly Cloudy
June 949°F9°C70°F21°C8 mph14 km/h from WestPartly CloudyMostly Clear
June 1051°F11°C75°F24°C9 mph14 km/h from SoutheastPartly CloudyMostly Cloudy
June 1158°F14°C70°F21°C11 mph18 km/h from SoutheastRainDrizzle

Yes

Low of 48°F9°C, High of 60°F16°C
Wind: 13 mph21 km/h
Precipitation: 65% rain

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