Based on the weather in Abbotsford, British Columbia, Canada as of September 4, 2015 9:29am local time

Why? Because it's not very warm out.
Current Conditions
Partly Cloudy
Temp: 52.7°F • 11.5°C
Wind: 1.9 MPH • 3.01 KPH
Precip: 0%

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes