Based on the weather in Glasgow, Glasgow City, United Kingdom as of October 27, 2016 9:37pm local time

Why? Because it's not very warm out.
Current Conditions
Light Rain
Temp: 55.4°F13°C
Wind: 12.8 MPH20.7 KPH
Precipitation: 100% rain

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes