Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived.

Model-derived from a global ocean grid. Useful indication; expect about ±45 minutes on average vs. a local harmonic gauge, individual stations vary widely. See /methodology for per-region detail. Not for navigation.

Conditions as of 13:00 local time. Refreshes daily.

Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived. · Not for navigation.

The angler tradition that rates each day for fish-bite likelihood using moon transits and rise/set. One to five stars, not a scientific forecast.

• Mon
  ★★★★★
• Tue
  ★★★★★
• Wed
  ★★★★★
• Thu
  ★★★★★
• Fri
  ★★★★★
• Sat
  ★★★★★
• Sun
  ★★★★★

Next spring tide on Sat 02 May (range 0.7m). Last neap on Sun 26 Apr.

Spring tides cluster around new and full moons (biggest swings). Neap tides land on quarter moons (smallest swings). See the spring tide and neap tide glossary entries for the why.

Florianópolis sits on the long Ilha de Santa Catarina on the southern Brazilian coast, with the open Atlantic on its eastern shore and the protected bay between the island and the mainland on its western. The city centre crosses the bay on the Hercílio Luz bridge, with the working ferry crossing at Itacorubi and the long sand beaches of the eastern coast running from Praia da Joaquina south to Praia Mole, Praia da Galheta, and the Lagoa da Conceição at the centre. The tide signature here is small and mixed semidiurnal — mean range at the Florianópolis gauge is about 0.5 metres, with two highs and two lows of unequal size each day, climbing past 0.8 metres on the largest spring tides and dropping close to flat on neaps. The astronomical forcing is small because 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. What matters more on a day-to-day basis is wind setup from the south-quadrant frentes that sweep up from the Roaring Forties — sustained 25-knot south winds can lift apparent water level 30 to 50 cm above predicted, and the same wind builds the surf on the open eastern coast. Florianópolis sits at the centre of one of Brazil's strongest surf cultures; the breaks at Joaquina, Praia Mole, and Praia da Galheta read the swell more than the tide, while the protected western coast on the bay side at Sambaqui and Santo Antônio de Lisboa hosts the local oyster-farming industry where tide does set the working hours. Lowest spring lows around new and full moons open the bay-side mudflats at Tapera and the inner reaches of the Saco dos Limões. Open-Meteo Marine drives the gridded predictions on this page; for authoritative Brazilian tide data, Marinha do Brasil's Centro de Hidrografia da Marinha (CHM) operates the gauge network and publishes the official tide tables.