I got my first Non-Immigrant O Multiple-Entry Visa (based on Marriage) last year.

This visa expires 10 August 2015, while my latest 90 day extension expires this week.

I would appreciate if someone could confirm that, when I make a border run this week, Thai border police will, as a matter of course, grant me another 90 day extension when re-entering Thailand (i.e. allowing me to stay almost 3 months beyond the duration of the Non-Immigrant O Visa.)

Many Thanks.

As long as you re enter before the expiration date you will get another 90 days yes.

You can also extend that by 60 days at immigration within the kingdom.

Any entry before 10th August will get you 90 days.

Thanks stoneyboy & Lite Beer!

Great to know I can defer a few headaches for a few months!