Yes, it's hot, but what you plant and maintain now, will be beautiful for fall. It will be well worth the minimal effort and you'll be able to relax and enjoy it all when the cool season arrives.
Petunia 'Picobella White' White flowers bloom on a lovely compact, mounding form. Perect for containers. Heat tolerant. Beautiful and blooming until first frost. Annual color.
Caesalpinia gillesii Native, heat tolerant plant with striking yellow and red blooms in fall. Perennial.
Chasmanthium latifolium – Inland Sea Oats Native – grass that grows in partial shade. Delicate, breezy, cascading seed heads summer through fall. Very striking. Perennial.
Salvia 'Mystic Spires' Very heat tolerant. Spikes of blue flowers bloom heavily all summer. Perennial.
Hosta 'Honeybells' Shiny green leaves and fragrant, pale lavender flowers attract butterflies, bees and hummingbirds now through fall. Excellent for partial shade.