I would highly recommend contacting a department head at either a local community college, trade school, or university to see about being a guest speaker for a class. They are almost always looking for people to speak for their classes, and it'd be a great way to scratch that "itch" without having to leave your current position.
It really depends on what you want to teach and where:
Anything K-12 you will need an appropriate teaching degree.
At a university, you will almost certainly need a degree. It can happen that they hire industry specialists, but they tend to be more guest lecturers than actual professors and teachers.
At a community college, things are often more grey. At the college I attended, a lot of the early courses were taught by a professor who did not have any degree, but worked in the field for about 15 years and had a proven track record. The College pressured him a lot to finish his Bachelor's degree, but he never did. However, he was an outlier, and was the only professor I knew of who did not have an advanced degree (Masters+), and he was near retirement when I was there. Further, the department head noted that the classes he taught were not transferable to four year universities, and focused primarily on industry certifications, which were then tested by independent third parties.