The highest-rainfall months are late summer, from August to October with peak annual precipitation in September.

[2] The characteristic vegetation is dry forest, composed of low trees and shrubs with an herbaceous understory.

[3] Herbaceous plants are less prominent and include caribe (Cnidoscolus angustidens), buena mujer (Chloracantha spinosa), Solanum spp., and biznaga (Ferocactus spp).

[4] Other native animals include the peninsular mule deer (Odocoileus hemionus peninsulae), white-tailed antelope squirrel (Ammospermophilus leucurus), acorn woodpecker (Melanerpes formicivorus), red-spotted toad (Anaxyrus punctatus), and Baja California chorus frog (Pseudacris hypochondriaca).

The San Lucan gecko (Phyllodactylus unctus) is restricted to the southern peninsula and adjacent islands in the gulf.