I felt ok when I got up, but my wakeup HR was 53, about 10% high. As soon as I started running I could tell I didn't have the "zip" of energy that means I'll have a great run. When I got to 2 1/4 miles, I started to feel tired, and I turned around and came back, giving me 4.5 miles instead of 5 miles. I ran a slow pace around 12:15 - 12:30.
The sky was cloudy during my run, and the relief from direct sunshine was great! The temperature was 76 (F) when I left home and 78 (F) when I returned.