spearo sea-state engine: consensus of up to 6 models + satellite clarity (ZSD) + buoy-bias checks
Freshness
Re-read every hour, per coast
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.
How we score the water
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.
01
Swell & wave memory
Height, period and direction of the swell, plus the wake of recent storms — an old storm still stirs the water, and the engine remembers.
02
Wind & gusts
Speed and gusts, hour by hour — wind speed and an onshore push chop the surface and cut visibility.
03
Tide phase
Timing and range of the tide, calibrated per coast — big spring tides pull the verdict toward caution.
04
Water temperature
Sea-surface temperature — sharply cold water vetoes a green verdict.
05
Currents & outflow
Direction and drift of the current — it pushes you, and it drags turbid coastal water across where you dive.
06
Rain runoff & air clarity
Rain muddies the water inshore through land runoff, while fog and haze cut visibility at the surface.
07
Coast shape & exposure
How the coast faces the swell — a sheltered cove keeps the water clean; an exposed, head-on point takes a penalty.
Safety gates
Thunderstorm forecast — an instant red, no exceptions.
An official warning (MeteoAlarm / IPMA) — yellow, or red for the higher ranks.
Missing input data — a would-be green is capped to yellow rather than overstated.
Strong disagreement between forecast models — a green day is pulled back to yellow.
Night hours — where night spearfishing is banned by law the window is forced red; where it is legal (Australia outside NSW, New Zealand, South Africa) it is capped at yellow, never green.
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
Entry points with coordinates
Seabed relief — promising ground
This verdict — in your pocket. Open the app for the week's window.
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0 m
Surface
Wind, wave and the swell windows — when to go and the best hours.
spearo.app
yellowupdated 03:32
Muros — solo, off the rocks
DON'T GO
don't go · wave 2.2 m (occasionally up to ~4.4 m)
wave 2.2 mwind 12, gusts 25 km/hsurge pounding the rocksvisibility ~1 m
today, best window 06:00–09:00
fish · Visibility 1 m · Water 14.2°C
confidence low · verdict for the selected day
Whole week — tap a day. is driving swell right now.
›
Solo risk: carry a float · tell someone your plan and exit time · doubt = don't go. A model-based planner; the call is made on site.
Selected day
Windows, hours and the day's trends.
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.
Sunday · today2026-10-25
08:01–18:38 · full moon
▲ 02:00▼ 08:00▲ 15:00▼ 21:00 · 3.1 m
Hours (06→20)
06
09
12
15
18
Day's trends
Tide-1.16 m
Wave2.34 m
Wind8 km/h
Water14 °C
fish activity: moonset 07:10 · moderate · moon underfoot 12:30 · high · moonrise 17:57 · moderate · moon overhead 00:00 · high
Conditions window06:00–09:00
don't go fish
Hs 2.22 m · roughperiod 8.4 swind 12→25surge 37.8viz 1 m
What's missing? Tell us what you'd like to see — new spots, species, data or features. We read everything.
Your best window — with you. Forecast in your pocket.
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−10 m
The water column
Visibility and what drives it — post-storm clearing, river plume, temperature and the thermocline.
What it is
A marine instrument, go / no-go for solo hunting.
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.
The Galician day restriction applies in here as well: weekdays closed, except for the period from 1 May to 30 September and the days between Holy Thursday and Easter; the rest of the year, weekends and public holidays. Pick a morning flood tide too, which is when the inner water looks most presentable.
tide
The tide is the engine of this corner: almost three and a half metres on springs uncover mudflats and weedy stone, then fill them again in a few hours. On the flood, clearer salt water arrives from the mouth and the bottom improves a lot; on the ebb everything clouds over and an outgoing current appears.
shelter
Tucked inside the ría of Muros e Noia, this corner is sheltered from the 280° west that hammers the mouth: what reaches here is short chop, not groundswell. What does spoil it is a long southwesterly, which blows down the axis of the ría and raises dirty chop in no time.
conditions
This is ría water: two to four metres is normal and five on a dry summer day with the tide coming in. Everything that comes down the Tambre and the streams after rain ends up here, and then visibility drops to half a metre. It is the fallback for when there is sea outside, not the pretty spot.
hazard
People work here: there are mussel rafts, shellfish beds and guild boats, and you must keep 300 metres from any working vessel and not disturb the beds. Annex VI of the 2009 Order closes inner ría lines that we do not have drawn: check the Muros e Noia one before you go out. At night, prohibited.
access
Park on the Muros promenade and get in from any of the ramps or small beaches along the inner edge; there is almost no walking. The bottom shelves slowly, so you have to swim a fair while to find stone; come out at the same ramp and watch the slippery weed at low water.
More sheltered inner part of the ría; mixed bottom, shelter from W swell.
Before you look at the swell chart, look at the calendar: Saturdays, Sundays and official public holidays (state and Galician) all year, any day from 1 May to 30 September, and daily in Holy Week from Thursday to Easter Sunday. Here the good window is usually the morning, with the sea still asleep.
tide
With three and a half metres of range on springs, the water moves fast over the Punta Insua slabs and the break shifts position with every hour of tide. The prudent plan is to get in shortly after low water, when the surge is smallest, and to be out before the flood covers the entry ledge.
shelter
The Carnota rocky ground between Lira and Punta Insua faces the open Atlantic: the 215°–300° sector comes right in and the 280° west makes it unworkable for days. Only with a continental easterly, and groundswell under a metre, can the coast be worked along sensibly.
conditions
Rich ground and clean water when the sea allows: eight or nine metres over the rock on a good day. Summer upwelling chills it and turns it green during nordés spells, and any leftover west groundswell keeps the rock wrapped in bubbles with sand held in suspension.
hazard
The Os Miñarzos marine reserve covers waters off Lira and Carnota and its boundary is not drawn on our map: ask at the Lira fishermen's guild or the Xunta whether this point falls inside before you enter, because inside a reserve you do not spearfish without specific authorisation. Add a very exposed coast and the night ban.
access
You get there via Lariño and Portocubelo, park near the harbour and walk the track out to the rocky ground; the last stretch is loose stone. Get in at a low ledge with sea under a metre and decide your exit point beforehand, because here the spot you entered by may be breaking when you come back.
Carnota rocky ground; rich grounds, very exposed, only enter in calm seas.
Working days are prohibited in Galicia. You go on a Saturday, Sunday or official public holiday (state or Galician); and daily in Holy Week from Holy Thursday to Sunday, plus the whole block from 1 May to 30 September. It pays to head out at first light and be back before the westerly gets up in the afternoon.
tide
Three and a half metres of spring tide move a lot of water through the mouth and the current squeezes right as you round Queixal, especially when it runs against the wind. At low water heads appear that are covered at high water and break without warning; slack is the quiet moment to round the point.
shelter
Punta Queixal is the granite foot of Monte Louro, on the southern lip of the ría mouth, facing west-southwest (245°). The 215°–300° sector reaches it with nothing in the way and 280° is the heading that shuts it down completely; in a nordés, though, the mount casts a lee and the north face of the cape works.
conditions
Over the western drop-offs the water is oceanic and on a good day you get eight or ten metres. The trap here is upwelling: with a nordés holding for several days, cold green water rises from below, the temperature drops sharply and visibility shrinks even though the surface is like a plate.
hazard
This is an open cape: the surge against the granite does not forgive and there is no easy exit for several hundred metres of coast. With the mouth current, one lapse and you are carried into the ría. A float is compulsory and must stay within 25 metres, never a loaded gun out of the water, and night is banned nationwide.
access
Leave the car in the beach car park at the foot of the mount and walk across to the west side on the path that skirts the lagoon; it is a few minutes with gear on. Climb down to the rock at the lowest ledge you can find, and only if the sea is clearly under a metre.
Granite cape to the SW; drop-offs to the west with grouper and sea bream, very exposed to NW swell.
Outside summer only weekends and public holidays fit, because the Galician rule closes Monday to Friday. Between May and September, and on the days running from Holy Thursday to Easter, that limitation does not apply. The best light on the southern rocks falls mid-morning, with the tide still low.
tide
At spring low water, with more than three metres of range, the strand grows enormously and rocks appear to the south that let you get in without getting wet past the waist. At high water those rocks break and the entry gets awkward; on top of that the ebb pulls north along the whole beach.
shelter
This strand looks west-southwest with Monte Louro closing it off to the south, and that granite block takes some of the 280° edge off, leaving the southern end much calmer than the northern one. With an offshore easterly the beach flattens and the southern rocks come into their own.
conditions
The sand at San Francisco lifts with almost nothing, so the honest numbers are three to five metres beside the rocks and rather less in the middle of the strand. After two or three days without sea and an easterly it climbs to six; with west groundswell you cannot see the tip of your fin.
hazard
This is a surf beach with obvious rip currents: never get in through the middle of the strand when there is sea running, use the southern corner. In summer there are swimmers and you must keep well away from them with the float clearly visible. Night is banned, and pollack (Pollachius pollachius) cannot be kept from 1 January to 30 April.
access
Parking beside the lagoon behind the dune, then a few minutes of sand to the southern end; you get in over the rocks at the foot of the mount with the tide half falling. The exit is the sand itself: if the south end is breaking, swim in with the wave and do not try to climb the granite.
Sand with rock at both ends; entry over the south rocks, semi-sheltered from the W.
SOLO 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.
One morning glance — and you know.
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≈
Surfacing
Cameras, map and reference — to hand as you come up.
✓Spearfishing licence mandatory; the AUTONOMOUS COMMUNITY issues it (not the State) and it is valid in the exterior waters of the whole coast. Free-diving only — scuba is banned (, art. 3).
✓Spearfishing catch may not be sold or traded — it is non-commercial fishing ().
✓Night prohibited: spearfishing only in daylight (sunset to sunrise not allowed) — , art. 16.d.
✓Marker buoy MANDATORY: mark your position with a clearly visible buoy and stay within 25 m of it — , art. 15.
✓Never keep the speargun loaded out of the water — , art. 16.a.
✓Keep at least 300 m from professional fishing vessels that are working — , art. 12.b.
✓The state act (, art. 16) bans, for spearfishing: a loaded gun out of the water; explosive/electric points and lamps (hand torches excepted); underwater scooters; night — from sunset to sunrise. Plus art. 12 b), d), e): 300 m from professional fishing vessels, light as an attractant, poisons/explosives. A ban in a PARTICULAR reserve, port or beach comes from that place's OWN instrument (the reserve's order, the autonomous community's rules, the port authority) — see the no-take zones on the map and your community's rules.
✓Min. sizes by ( + + EU 2019/1241): sea bass 42 cm (rec.) / 36 cm / 25 cm Mediterranean / 22 cm Canaries; gilthead bream 20 cm and white seabream 23 cm in the Mediterranean (EU 2019/1241); grouper 45 cm. See your zone's species card.
✓Only species in Annex I of may be taken; keeping, landing or transporting undersized specimens is prohibited.
✓The licence needs a medical fitness certificate for free-diving and civil-liability insurance (or a federative licence, which includes it). Mandatory in the Basque Country/Murcia/Asturias/Galicia; the federative licence covers it in Galicia/Balearics/Cantabria; the Canaries and Andalusia do NOT require it for the individual licence (a responsible health declaration). Minimum age generally 16 (14 in Andalusia).
Safety protocol
Sets: watch the wave trains ≥15 min before entering; Hmax ≈ 2×Hs, the wash can run 50 m past the foam line. A lull >10 min with period >12 s = a big set «overdue», do NOT enter; enter right after a full set passes and re-check at minute 30.
Exit FIRST: find your exit AND a backup before entering. On a rocky/boulder shore a 0.5 m rise in swell can make the exit impossible — getting pinned/unable to climb out is the main killer.
Headland rip: prominent points often have a permanent topographic rip regardless of the model — locate it, enter/exit on the windward side, never swim against it.
Cold: wetsuit per the SST chip; the first shiver = a metabolic surge and a drop in breath-hold → get out at the first steady shiver. Cap the session at 45–60 min below 15 °C.
Solo discipline: buoy up; tell someone the spot and exit time; conservative breath-hold (never push it in cold/murky/surfy water); visibility <3 m — don't enter.
Afternoon wind: on many coasts the wind builds from midday — plan to be out of the water by midday; the chop builds — get out.
UV 11:00–15:00 (UVI ≥6): sunscreen and cover up on the surface interval.
Solo is a fundamental risk (hypoxic blackout with no buddy). Any doubt = No-go.
FAQ — spearfishing in Muros
Where can I spearfish in Muros?
Muros has rock entry points such as Monte Louro (Punta Queixal), Praia de Louro / San Francisco and Lira / Punta Insua. Muros sits inside a ría facing south-west, with Monte Louro guarding the mouth. Below you'll find each spot (access, shelter and hazards) and today's forecast.
When is the best season in Muros?
Mostly summer (June–September), with rich marine life. But upwelling and the nortada can chill and cloud the water suddenly, and the Atlantic tides are big — factor in the tide and current.
How cold is the water in Muros?
Cold: ~13–19 °C, with upwelling dropping it in summer when the nortada blows. Expect a 7 mm suit + hood, gloves and boots for much of the year.
Is Muros good for a beginner?
Demanding: a cold Atlantic coast with big tides that set up current and rocky entries. The rías offer sheltered corners, but reading the tide and current is a must — not a place to start when there's swell running.
Do I need a licence in Muros?
Yes — in Muros you need a recreational sea-fishing licence (issued by the autonomous community); breath-hold only (no scuba), with a marker buoy and no night diving. See the guide.
✓There is no fixed national catch cap (, art. 5 delegates it to the communities); the standard is 5 kg/person/day, with 1 specimen allowed not to count (Canaries — Decreto 182/2004, art. 38.3; Murcia; Galicia; Basque Country). Protected species have per-piece quotas.
✓Only a harpoon is allowed — hand-held or mechanically propelled, with one or several points (, art. 14.1). Carrying spearfishing gear and underwater breathing equipment aboard AT THE SAME TIME is prohibited (art. 14.2) — an offence in itself, even if you dived on a breath hold.
✓Spain is not one jurisdiction. The licence is issued by a coastal autonomous community, and you must comply with the rules of the administration on whose littoral you are in the water: «debiendo cumplir la normativa establecida por la administración en cuyo litoral se realice la actividad» (, art. 13). Interior waters — inside the straight baselines: bays, coves, rías, the whole coastal strip — are the community's competence; exterior waters are the State's. So the age, the days of the week, the distances and the are found in your community's act, not in the state one.
✓Galicia: «Clase C» licence (submarina), procedure PE405A on the Xunta portal; minimum age 16, medical certificate required. Galicia recognises spearfishing licences from other communities and the EU. sede.xunta.gal (PE405A).
✓No-take zone: Atlantic Islands National Park (Cíes, Ons, Sálvora, Cortegada) — spearfishing banned (see zones on the map).
✓Galicia is the only community that closes weekdays: spearfishing is allowed only on Saturdays, Sundays and state or regional holidays, and from Maundy Thursday to Easter Sunday and from 1 May to 30 September, every day (Orden 17.09.2009, art. 13.2). Daylight only, orto to ocaso (art. 13.3). The cap is 5 kg per licence per day, and 2 octopus per fisher per day (art. 12.3). The zones closed to spearfishing are listed in (art. 11.2). The licence needs an official medical fitness certificate, insurance and an arms licence or a federation card (art. 3.b).
⛔ Seahorses (Hippocampus) — protected (RPE).
Rules change and are REGIONAL. Before heading out, check with the competent autonomous community (licence) and the min-size table in force.
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