Florianópolis, Santa Catarina tide times

The hero block shows the next high tide at the Florianópolis gauge in local Brasília time (BRT, UTC-3, no DST since 2019). The 7-day table covers all the highs and lows. High water on the open eastern beaches arrives a few minutes ahead of the inner bay; on the protected western side at Sambaqui the timing matches the central gauge closely.

Mean range is about 0.5 metres, climbing past 0.8 metres on the largest spring tides and dropping close to flat on neaps. The pattern is mixed semidiurnal — two highs and two lows of unequal size most days. The astronomical signal is small at this latitude; wind setup from south-quadrant frentes and the steady summer NE trade can shift apparent water level 30 to 50 cm above or below predicted.

The South Atlantic at this latitude is broad and the continental shelf relatively narrow, so the tide propagates as a near-progressive wave rather than amplifying through resonance the way it does in the Bay of Fundy or the Bristol Channel. The astronomical forcing is small everywhere in the South Atlantic outside of a few specific resonant basins (the Patos Lagoon mouth at Rio Grande and the Amazon estuary at Macapá being the obvious counter-examples).

Open-Meteo Marine, a gridded global ocean model. Useful for daily planning around the bay and the open eastern coast. For authoritative Brazilian tide data, Marinha do Brasil's Centro de Hidrografia da Marinha (CHM) operates the gauge network at Florianópolis and across the southern coast, and publishes the official tide tables for navigation.

No. For piloting in or out of the bay, transiting the Hercílio Luz bridge area, or working the open eastern coast use CHM's authoritative tide tables, the Brazilian Navy's notices to mariners, and the local pilotage guidance for the Itajaí approach further north. South-quadrant frentes can build heavy swell on the open eastern beaches with little astronomical-tide warning.