Now that the weather is so iffy every.single.day., I'm always at a loss on what to wear when I run outside.
This super duper, awesome article from Runner's World, discusses dressing for runs. I've always heard to dress 10-20 degrees warmer outside than what it really is and that's exactly what these experts say:
above 70...lightweith/light-colored singlet and shorts
60 to 69...tank top or singlet and shorts
50 to 59...t-shirt and shorts
40 to 49....long-sleeve shirt and tights or shorts
30 to 39...long-sleeve shirt and tights
20 to 29...two upper-body layers and one lower-body layer
10 to 19...two upper-body layers and one lower-body layer
0 to 9...two/three upper-body layers, one/two lower-body layers
below 0...three upper-body layers, two lower-body layers
I hope this helps you as you get ready to set out on your runs this fall.