Amtrak Cascades train 509 has a clear indication on the cantilever signal at Vader, WA on a beautiful September evening. 509 was the last of 14 trains passing this spot in a 4 hour period on September 12th 2013.
Some of the best weather we have in the Pacific Northwest happens in September. The sun starts down after 7pm but with the warm days the temperatures are still comfortable enough to be outside after sunset. Early September usually remains dry so the skies are clear and the bugs are few. All this adds up to some great September nights outside!