Yes

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

Why? Because it's pretty chilly!
51°F10°C & Mostly Clear

Wind is 4 mph7 km/h from the W, gusting to 12 mph19 km/h
October 17
8pm51°F10°C5 mph8 km/h WMostly Clear
9pm51°F10°C4 mph7 km/h WMostly Clear
10pm49°F9°C3 mph5 km/h WClear
11pm47°F8°C3 mph4 km/h SMostly Clear
October 18
12am46°F8°C3 mph5 km/h SWMostly Clear
1am45°F7°C3 mph5 km/h SWPartly Cloudy
2am45°F7°C3 mph4 km/h SWPartly Cloudy
3am46°F8°C3 mph5 km/h SPartly Cloudy
4am49°F10°C4 mph6 km/h SPartly Cloudy
5am54°F12°C5 mph9 km/h SPartly Cloudy
6am57°F14°C10 mph15 km/h SMostly Cloudy
7am60°F15°C14 mph22 km/h SWMostly Cloudy
DateLowHighWindDayNight
October 1745°F7°C61°F16°C10 mph16 km/h from SMostly CloudyRain
October 1851°F10°C60°F16°C8 mph13 km/h from WMostly ClearRain
October 1953°F12°C63°F17°C16 mph26 km/h from SWRainMostly Cloudy
October 2049°F10°C60°F15°C9 mph15 km/h from WMostly ClearPartly Cloudy
October 2148°F9°C61°F16°C11 mph18 km/h from SWPartly CloudyPartly Cloudy
October 2246°F8°C62°F16°C7 mph11 km/h from SPartly CloudyMostly Cloudy
October 2350°F10°C59°F15°C12 mph20 km/h from SEMostly CloudyDrizzle

Yes

Low of 51°F11°C, High of 61°F16°C
Wind: 8 mph13 km/h
Precipitation: None

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