Q.Gardening in Fl., zone9
Is it possible to grow succulents in a garden with our rainy summers?

Soil and location will be key to success, but yes, Succulents can be grown.
A rock garden area, or even pots are great areas to tuck in succulents.
Sedums and stonecrop are also great choices for you.
Here are some links to help you get started.
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/outdoor-succulent-garden.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/succulent-plant-info.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/exotic-showstoppers-beautiful-succulents.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/aeonium/growing-aeonium-plants.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/echeveria/caring-for-echeveria-plants.htm
https://www.gardeningknowhow.com/ornamental/cacti-succulents/sedum/sedums-plants.htm