I 2nd the Glock 26. If you already have looked at the G19 and you like it, it probably won't take much for the G26 to win you over. The G19 can easily be concealed with a proper belt, holster, and clothing. A polo shirt , in one size larger than I normally wear, is one of my preferred hot weather cover garments with a IWB holster.
Your weather is much like my weather, hot and humid......just plain miserable most of the time. This means sweat. Sweat and humidity can lead to rust , if your pistol is not protected in some way. Even worse if you live near or on the coast. Glock's tenifer finish is probably one of the best at corrosion resistance. Several coastal PD's down in FLA chose Glock for the same reason. The Coast Guard chose to carry Sigs, which is another one that does well against corrosion.
If you do not choose a pistol that has some sort of protective coating or tenifer, then you will have to keep the pistol rubbed down with oil or protectant.