By Utah standards, it's quite humid out there. The dewpoint last night at KSLC topped off at 65F and remains in the low 60s.
The highest dewpoint I can recall seeing at KSLC is 68F and I assume anytime we are in the 60s we're in rarified air. Perhaps someone can grab the hourly data from NCDC and get a better handle on the frequency of 65F dewpoints and the highest dewpoint observed at KSLC.
I'm on the road and haven't had a chance to dig into this, but did notice that the Phoenix National Weather Service Office mentioned in their forecast discussion this morning that the remnants of Tropical Storm Don are moving across eastern Arizona today, as we speculated might happen.