I wouldn't be surprised if we go the rest of August with little to no rain. As Ntxw says, we need to look towards the Pacific off the west coast of Mexico rather than the Gulf of Mexico. Of course this isn't the time of year that we would see moisture plums being drawn up. Will need to wait at least another month.
As far as why we don't get as much relief as other areas along the gulf, several valid points have already been made so I won't get into it too much but latitude also plays a role as well as our location relative to the gulf. The 30th Parallel cuts right through Texas, just a tiny bit south of Austin. As we all know most of the northern hemisphere deserts ring around the planet along the 30th due to sinking air. The I-35 corridor is lucky enough to be fairly close to the gulf plus the Balcones Escarpment helps to enhance rainfall along the corridor. The farther west, the drier it gets.... <----See what I did there

Our location relative to the gulf is not as conducive as areas along the northern and eastern sides mainly because the dominant winds across the gulf are generally out of the south. Since this is the western side, our southern winds aren't straight off the water. We need southesterly and easterly winds to be dominant, then we would have much more moisture moving in and get heavier sea breezes.