Unofficial Taylor Guitar Forum - UTGF

Thanks so much for your thoughts and advice! That's very helpful and reassuring!

Mary had a little lamb — Stevie Ray Vaughan

Dust in the Wind - Kansas

You've Got Another Thing Comin' — Judas Priest

I would not want to be without my guitar on vacation for weeks or months.  First of all, don't panic.  You and your guitar will likely be fine in those moderate temperatures.  Temps of 20-30°C (68-86°F) are perfectly fine for a wood guitar.  If you are worried about leaving it in the van on a hot day, you can wrap the Aero Case in extra clothing, blankets, sleeping bag, and so forth to moderate the heat uptake.  Place the guitar on the floor where the temperature will be coolest, and in the shade.

The case padding is probably impervious to moisture absorption, likely being closed-cell foam of some kind.  However, moisture will transmit through the zipper of the Aero Case.  I have found that humidity devices (water beads in a perforated soap dish in my case) last about 3X as long in a hard case than in a gig bag.  You will have to recharge them more often if it is too dry -- but that sounds unlikely.  Exposure to 60% and even 80% RH will not automatically kill your guitar.  Heat is more the enemy than humidity.  Download the "symptoms of a wet guitar" info from the Taylor website and get familiar with what to watch for. 
https://www.taylorguitars.com/support/spot-fix-over-humidified-guitar
https://www.taylorguitars.com/support/spot-fix-dry-guitar

Although they recommend the two-way Humidipak system, the conventional wisdom is that those are actually poor absorbers of excess moisture.  Packs of silica gel, as used in electronics, can be used to soak up excess moisture.