Moab Utah

Either destination will be fine in October, any storm will just be passing through quickly as it is too early for anything severe.

I've lived in Moab off and on for 20 years. You're going at the prime time. Fewer tourists and no bugs and nice cooler weather. Even if you get some weather, it's usually nice enough to do whatever you want. I've camped there in Nov and Dec and the nights can be chilly (40s) but the days are often in the 60s, sometimes the 70s.

Our normal time to go to Moab is the end of October. Chilly at night, sometimes a little rainy during the day. Perfect t shirt and shorts hiking weather most years we have been there. Not crowded, plenty of camping available. We think it is the perfect time.

If you go to Wunderground.com or Weather.com, you can see what the historical weather is for a period of time. This is probably even better than peoples isolated experiences.

I went to the GC in October - it was lovely, cool and not crowded. No rain, but that was that year.