Virginia Key and Miami both have summer-like weather all year-round! There are definitive wet and dry seasons with more rainfall, storms, and potential for hurricanes in the late summer and early fall. Winter and spring months, however, are still warm but you'll definitely experience less humidity.
Virginia Key is located in Biscayne Bay. It is immediately south of Fisher Island and South Beach. To access Virginia Key, traffic and pedestrians must use the Rickenbacker Causeway which connects to the Brickell neighborhood of Miami as well as I-95. Additionally, Rickenbacker Causeway is the only major roadway through Virginia Key and only parts have maintained sidewalks, so pedestrians will need to exercise caution while out walking Fido!
However, Hobie Island Beach Park is not only open to pets, but dogs are allowed to run free in the sand and the waves! Hobie Island Beach Park is located immediately off of the Rickenbacker Causeway and sits on the bayside of the Key. This means the water is shallow and the waves should not be overwhelming, even for smaller pups. As one of the few authorized dog beaches in Miami, this is a great option for you and Fido on a hot summer day.