Yes

you do need a jacket based on the weather in Totnes TQ9, UK 1 second ago

Why? Because it's cool. Pleasantly cool, but cool and the wind is offering free, unsolicited face massages!
58°F14°C & Mostly Clear

Wind is 13 mph21 km/h from the West, gusting to 24 mph39 km/h
September 10
5pm58°F14°C13 mph21 km/h WestMostly Clear
6pm57°F14°C13 mph21 km/h WestMostly Clear
7pm56°F14°C12 mph20 km/h WestMostly Clear
8pm56°F13°C13 mph20 km/h WestMostly Clear
9pm56°F13°C13 mph20 km/h WestMostly Clear
10pm55°F13°C13 mph21 km/h WestPartly Cloudy
11pm55°F13°C13 mph22 km/h WestPartly Cloudy
September 11
12am55°F13°C13 mph20 km/h WestPartly Cloudy
1am55°F13°C14 mph22 km/h WestDrizzle
2am54°F12°C12 mph19 km/h WestDrizzle
3am55°F13°C14 mph22 km/h WestMostly Clear
4am57°F14°C14 mph22 km/h WestMostly Clear
DateLowHighWindDayNight
September 956°F13°C65°F18°C10 mph16 km/h from SouthwestRainMostly Clear
September 1054°F12°C61°F16°C17 mph27 km/h from WestDrizzleDrizzle
September 1153°F11°C62°F17°C16 mph25 km/h from SouthwestDrizzleRain
September 1252°F11°C62°F17°C15 mph24 km/h from WestMostly ClearRain
September 1353°F12°C66°F19°C23 mph37 km/h from SouthwestRainDrizzle
September 1455°F13°C62°F17°C25 mph40 km/h from WestDrizzleWindy
September 1552°F11°C61°F16°C15 mph23 km/h from WestMostly CloudyDrizzle

Yes

Low of 54°F12°C, High of 61°F16°C
Wind: 17 mph27 km/h
Precipitation: 71% rain

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