- window
- tide
- shelter
- hazard
- access
Mainland rock banks, 3–8 m, by boat; often murky water. Coords approximate, check your water entry.
Google MapsToday — right on the edge — wave, wind and surge pounding.
Sources & confidence
Compiled by the spearo sea-state engine
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.
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: 1152 spots across 189 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 mapMainland rock banks, 3–8 m, by boat; often murky water. Coords approximate, check your water entry.
Google MapsIsland reef, 5–20 m — no-take — dive/info only.
Google MapsRocky reef, 3–12 m — legal (outside reserves). Cabrilla, pez fuerte, barracuda, grouper.
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.
Rules change. Before heading out, check with CONAPESCA/SADER (E5CINCO permit), CONANP (no-take marine ANPs) and NOM-059; apnea only.
Spearfishing in San Blas depends on finding clean water away from the mangrove-tinted shoreline. The practical mainland options are Bancos de San Blas, shallow rock banks in 3-8 m by boat, and Las Islitas/Matanchén, a 3-12 m rocky reef outside reserves. Isla Isabel is not a spearfishing recommendation here: it is listed as an island park and protected reference, so treat it as no-shoot. Mexico requires a CONAPESCA/SADER permit, apnea only, one allowed speargun and a five-fish daily limit.
Keep the plan on mainland rock and cancel if visibility is not enough to identify fish, reef and exit.
| Spot | Type | Depth | Level | Access | Notes |
|---|---|---|---|---|---|
| Bancos de San Blas | Mainland rock banks | 3-8 m | Intermediate; boat-based | Local boat, approximate coordinates | Shallow, but often turbid. Works only with settled sea and a skipper who knows the bank. |
| Las Islitas / Matanchén | Shallow rocky reef | 3-12 m | Intermediate | Confirm local entry or boat support | Legal reef outside reserves, with cabrilla, pez fuerte, barracuda and grouper noted. |
Visibility is the main filter. San Blas has mangroves and often turbid nearshore water, so wait for settled sea and choose rock away from dirty runoff. Isla Isabel stays off the capture list because it is a protected island-park reference.
Do not treat Isla Isabel as a capture spot. It is handled here as protected and no-shoot.
Yes. Mexico requires an individual recreational sport-fishing permit.
No. Spearfishing is apnea only.
This guide uses the national five-fish daily limit.
Not always. Mangroves and turbid coastal water make visibility the deciding condition.
Leave your email — and the moment a window opens at San Blas, we'll send the go / no-go verdict. Email is all we need.
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transparency ~2 m · satellite, 2 days agosatellite estimate · may differ right at the shore