If you also have an International Driving Permit (get it from the Irish authorities) , yes you can drive as a visitor in the USA. You must carry your Ireland driver's license and your IDP when you are behind the wheel.
To convert a foreign license, you will be required to pass a vision test and a written knowledge test, with a valid, unexpired, foreign license you may not be required to take the road skills test. Only foreign license that the DMV can authenticate will be accepted.
5. What if my out-of-state license expires before I can get it transferred to Texas? As a new Texas resident, you may drive with a valid, unexpired driver license from another U.S. state, U.S. territory, Canadian province, or qualifying country for up to 90 days after moving to Texas.
If your foreign driver's license was issued by a country with which Texas has a reciprocity agreement, you can simply exchange it for a Texas driver's license at your local Department of Public Safety office without having to go through the application process.
Driving privilege reciprocity allows a person to use a valid, unexpired foreign license to operate a motor vehicle in Texas for up to one year or until a person becomes a Texas resident, whichever date is sooner.
For European residents, a Class B license is required in order to rent a car in the U.S. You must also have your original license in your possession AT ALL TIMES.
International Students and Scholars may drive with a valid, unexpired driver's license from another state or country for up to 90 days after moving to Texas. You can also use an International Driver's Permit (IDP) to drive up to 90 days as well.
You may drive a car in the United States for one year using an International Driver's Permit (IDP) and a driver's license from your home country. Getting an IDP is the simplest way to be licensed to drive in the United States. You must get your IDP in your home country before arriving in the United States.
If you have a valid driver license from another U.S. state, U.S. territory, you must surrender the license and you are not required to take the knowledge or skills exam. Texas also has license issuance reciprocity with Canada, France, Germany, South Korea, and Taiwan only.