I'm 18 and I'm traveling alone but I have no ID?

I'm going to Southwest airlines in Oakland to travel to Arizona. My mom is sending me there but I don't have an ID and I'm 18. I'd get one right away but doesnt the DMV take a couple weeks to issue an ID? I'm leaving on the 29th of June. Help! What do I do? Am I able to get a temporary ID from the DMV? Will the airport accept that?