The climate is tropical, warm and humid. Average rainfall is about annually, and average temperature is. The Ilha Comprida Environmental Protection Area is in the Atlantic Forest biome, and contains restinga forest, dunes, beaches and mangroves. It is one of the last complexes of such ecosystems on the coast, a nursery of South Atlantic marine and terrestrial species, used by over 30 species of migratory birds, and the location of archaeological remains. It is part of the Iguape-Cananéia-Paranaguá estuary lagoon complex.
History
The first settlements were made on the island in 1955. Since 1970 real estate speculation led to unplanned authorization of hundreds of lots, leading to disorderly occupation of land on the island. Most of the real estate development did not satisfy the infrastructure requirements that were a condition of their approval. There was growing concern about environmental damage. Federal decree 89.336 of 31 January 1984 declared that the Ilha Comprida was an area of relevant ecological interest and recommended that it be made a conservation unit. State decree 26.881 of 11 March 1987 made the island an environmental protection area. This was before the island had been made a municipality. The purpose was to conserve the environment while allowing some human occupation. Since then there has been ongoing occupation of the island by people, often without land titles, which has jeopardized the environmental balance. State decree 28.295 of 1988 suspended approval of land allocation until the APA regulations have been published. State decree 30.817 of 30 November 1989 defined zones within the APA and defined the allowed use and activities within each zone. It gave guidelines and standards to be followed to allow occupation without damaging the existing ecosystems. Since then the municipality has proposed revised zoning that would further reduce and fragment the wildlife protection areas and increase the urban areas. Starting in August 2015the Institute for Ecological Research has partnered with the São Paulo Foundation for Conservation and Forest Production to develop a management plan for the APA. The management plan, due to be completed in August 2016, would describe fauna, flora, physical environment and socioeconomic aspects. It would define land use and occupation rules, zoning and priority programs and actions. Preparation of the plan involved consultation with local residents, civil society organizations and government agencies.