Today — right on the edge — wave, wind and visibility.
Sources & confidence
Compiled by the spearo sea-state engine · How it works →
The verdict comes from seven water factors and hard safety gates — not ten tabs. Go or stay.
Our own model
Our own forecast engine — not a third-party widget. It weighs these water factors into one go-or-stay verdict for this coast; the 0–10 dial is that verdict, read out as a number.
Safety gates
It all folds into a single 0–10 score and one verdict: go or stay.
A forecast, not a guarantee — the sea has the last word.
Where to get in, where to hunt
Wind, wave and the swell windows — when to go and the best hours.
The day is picked above, in the hero. Here are that day's windows, the hour-by-hour map and the trends. Tap a window to break down the conditions.
Leave your email — and the moment a window opens at Guaratuba, we'll send the go / no-go verdict. Email is all we need.
What's missing? Tell us what you'd like to see — new spots, species, data or features. We read everything.
Visibility and what drives it — post-storm clearing, river plume, temperature and the thermocline.
spearo.app folds wind, wave, swell period, visibility, tides, water temperature and risk into a single verdict — go to the spot or not. It computes 7 days ahead from open marine models (Open-Meteo, IPMA), with no sign-up and no accounts. Built for solo spearfishing off the rocks, where any mistake costs dearly.
Now live: 3016 spots across 406 stretches of coast — mainland Portugal, Madeira and the Azores.
See all spotsRelief and bottom type, tides, and the depths of each spot.
The models set the window. Whether you go in is read only at the water: count the sets, watch the surge on the entry. If in doubt, you don't get in.
Scouted entries, coloured by today. The colour is the sea state at the spot, not a guarantee: the wash and a slippery entry you judge on site.
Open the seafloor mapThe only genuine granite headland on the seafront, dividing Praia Central from Praia Brava; walk in from the viewpoint. Rock-and-sand bottom, 0–6 m. The water is nearly always turbid from bay outflow: expect 1–3 m and only go on a calm day with no rain the day before. Signal buoy mandatory (IN MMA nº 21/2005 art. 5º). Coordinate computed on the OSM coastline, 51 m off the beach.
Google MapsExposed stretch just south of Morro do Cristo, known locally as Paraguaios: open sea, surf, loose rock at the point and sand beyond, 0–5 m. It is a surfers' and shore-anglers' beach; for a speargun it works only on slack tide and a flat sea — any south swell turns the water milky and sets a longshore current. Approximate coordinate on the coastline.
Google MapsNorth end of the seafront, close to the bay entrance: rock outcrops in the sand and, per local sources, the remains of an old wreck exposed at low water — not confirmed from a primary source. Shallow, 0–4 m. It sits in the direct influence of the bay mouth: turbid on the ebb, strong tidal current. Approximate coordinate and a weak place-name match.
Google MapsA fishing village at the Guaratuba Bay entrance; the inner side is sheltered, the outer one opens to the sea. It is one of two places the municipal sources name as a fishing area. For diving the bay mouth is the problem: strong ebb current and sediment-loaded water. Slack tide and a flat sea only. Mixed bottom, 1–8 m; coordinate 94 m off the shore.
Google MapsSOLO is the biggest risk: underwater you can black out from lack of oxygen silently and fatally, with no one around. Solo is never truly «safe». Below are the best weather windows; carry a buoy, tell someone your plan and exit time, and any doubt — don't go.
Cameras, map and reference — to hand as you come up.
Check the cam BEFORE you leave. Foam, brown/green murk, or waves washing the entry rocks = No-go. At night/in fog the cam is useless — treat it as «unknown», NOT «green».
Guaratuba has rock entry points such as Costão do Morro do Cristo, Praia Brava (Paraguaios) — pedras ao sul do Cristo and Praia das Pedras / Prainha (norte da orla). A town on the south bank of the Guaratuba Bay mouth: long sand beach, one real rocky headland (Morro do Cristo) and a scatter of rock at the north end of the seafront. Below you'll find each spot (access, shelter and hazards) and today's forecast.
Inside the Paranaguá and Guaratuba estuaries the water is turbid all year; clear days only happen on the outer rocks, in summer with a north wind.
Temperate, ~18–25 °C — a 3–5 mm suit. The only clean bottom is the outer Itacolomi rocks, to 16 m; inside the estuaries there is no visibility.
Advanced: the state's only clear mark is 7 nm off the bay mouth, boat only; everything else is turbid water.
Yes — in Guaratuba you need the Licença de Pesca Amadora (gov.br portal; the category follows boat use, per the MPA: «desembarcada» R$ 20/yr when you enter from shore, «embarcada» R$ 60/yr with a boat — Portaria 616/2022 itself sets no categories; 65+/pensioners exempt). Breath-hold only (no scuba tank — art. 4º §3º), licence on you (art. 17); take home at most 15 kg + 1 fish and never filleted or headless (arts. 8º and 12); don't sell the catch (art. 6º). A marker buoy is mandatory in Santa Catarina (IN MMA 21/2005, art. 5º) — there is no federal buoy rule. Goliath grouper (mero) is full no-take, dusky grouper has a 1 Nov–28 Feb closed season, badejo-mira and peroá close on 25/10/2026 (Portaria GM/MMA 1.666/2026, art. 12) and taking lobster while diving is banned all year (Portaria SAP/MAPA 221/2021, art. 6º III). See the guide.
Rules change and vary by state. Before heading out, check on gov.br (recreational licence, MPA) and the state closed seasons/sizes; apnea only, goliath grouper is banned.
