Based on the weather in Custer, Washington, United States Of America as of September 3, 2015 10:09am local time

Why? Because it's not very warm out.
Current Conditions
Mostly Cloudy
Temp: 56.3°F • 13.5°C
Wind: 5.2 MPH • 8.38 KPH
Precip: 1% rain

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes