Yes

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

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and it's really really huffing out there!
66°F19°C & Drizzle

Wind is 19 mph30 km/h from the South, gusting to 34 mph54 km/h
August 30
1pm66°F19°C19 mph31 km/h SouthDrizzle
2pm66°F19°C18 mph29 km/h SouthDrizzle
3pm65°F19°C17 mph28 km/h SouthwestDrizzle
4pm65°F18°C16 mph25 km/h SouthwestDrizzle
5pm63°F17°C13 mph21 km/h SouthwestPartly Cloudy
6pm61°F16°C12 mph20 km/h SouthwestMostly Clear
7pm59°F15°C12 mph19 km/h SouthwestMostly Clear
8pm57°F14°C11 mph18 km/h SouthwestMostly Clear
9pm57°F14°C11 mph17 km/h SouthwestMostly Clear
10pm56°F13°C11 mph17 km/h SouthwestPartly Cloudy
11pm56°F13°C10 mph16 km/h SouthwestClear
August 31
12am55°F13°C10 mph16 km/h SouthClear
DateLowHighWindDayNight
August 2954°F12°C66°F19°C13 mph22 km/h from SouthRainDrizzle
August 3055°F13°C66°F19°C17 mph27 km/h from SouthDrizzleDrizzle
August 3155°F13°C65°F18°C14 mph23 km/h from SouthwestRainMostly Clear
September 153°F11°C63°F17°C9 mph15 km/h from SoutheastRainDrizzle
September 255°F13°C68°F20°C13 mph21 km/h from SouthwestDrizzleRain
September 356°F13°C65°F18°C14 mph23 km/h from SouthwestDrizzleThunderstorms
September 454°F12°C66°F19°C12 mph19 km/h from WestDrizzlePartly Cloudy

Yes

Low of 55°F13°C, High of 66°F19°C
Wind: 17 mph27 km/h
Precipitation: 36% rain

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