From very low to comfortably high. Rates depends on the kind of work, the location of the customer, and the experience and savvy of the freelancer.

I lived overseas while working for US companies. I met nomads making $20/hr and others charging $150-$300 per hour. A few with specialized skills claimed to charge even more than that.

If you have a full-time job that allows you to live anywhere you should make whatever you make now. If you freelance you charge based on the value of your work to the customer, which has nothing to do with your location.