It’s way too hot in Texas to do much of anything outside right now. It’s been 105ºF with the heat index each day this week and the weekend will be even hotter. That means if you want to go out hunting Pokémon, you better do it at night when it’s a cooler 80ºF, but you’ll still enjoy the lovely 98% humidity.
If you want to get a headstart on the available Pokémon in the area, what you can do is use Pokevision to find them, then drive to the area so you can go hunt them down on foot.
Pokévision offers a map that allows you to drop a marker in your area and then see all the remaining Pokémon around it in real time. The timers countdown to when they will disappear, and if the timer is not at zero, the Pokémon should be exactly where it’s marked on the map.
The catch is that with the game being so popular, the servers are constantly overloaded, and after waiting for two hours, the map still has no update for me on my area.