There are some buildings that allow monthly rentals, although most stipulate a yearly lease.
Sometimes, agents or landlords do advertise weekly rentals as well.
You got to make sure that weekly rentals or month to month rentals are allowed by the condominium though (may not be allowed). How to make sure? You can call the condo association or have your agent verify this for you.
Most landlords prefer yearly leases. The annual leases are also cheaper than seasonal or short term rentals (which month to month is a short term).
However, you could definitely find what you are looking for - subject to your budget decision.
Hope this helps,
Beachfront Realty, Inc.