Yes

you do need a jacket based on the weather in Glasgow, UK 5 minutes ago

Why? Because some drizzle out there and it's not very warm out and it's windy enough to give you a brand new hairdo!
53°F12°C & Drizzle

Wind is 9 mph14 km/h from the East, gusting to 20 mph32 km/h
September 17
5am54°F12°C8 mph12 km/h EastDrizzle
6am56°F13°C6 mph10 km/h EastDrizzle
7am58°F14°C5 mph8 km/h SoutheastDrizzle
8am61°F16°C6 mph10 km/h SouthwestDrizzle
9am63°F17°C11 mph17 km/h SouthwestMostly Cloudy
10am64°F18°C13 mph21 km/h SouthwestMostly Cloudy
11am64°F18°C14 mph22 km/h SouthwestMostly Cloudy
12pm63°F17°C14 mph23 km/h SouthwestPartly Cloudy
1pm62°F17°C14 mph23 km/h SouthwestMostly Cloudy
2pm61°F16°C14 mph23 km/h SouthwestPartly Cloudy
3pm59°F15°C14 mph23 km/h SouthwestPartly Cloudy
4pm58°F15°C15 mph24 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 1651°F10°C64°F18°C10 mph16 km/h from SouthDrizzleWindy
September 1754°F12°C61°F16°C13 mph22 km/h from SouthwestDrizzleRain
September 1853°F12°C63°F17°C8 mph13 km/h from SouthwestRainCloudy
September 1946°F8°C61°F16°C6 mph10 km/h from NortheastRainRain
September 2041°F5°C56°F13°C11 mph18 km/h from NorthMostly CloudyMostly Clear
September 2139°F4°C55°F13°C5 mph9 km/h from NortheastPartly CloudyPartly Cloudy
September 2239°F4°C56°F14°C5 mph8 km/h from NortheastMostly CloudyMostly Cloudy

Yes

Low of 54°F12°C, High of 62°F17°C
Wind: 13 mph22 km/h
Precipitation: 33% rain

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