- window
- tide
- shelter
- hazard
- access
E-facing bay, rock/sand/posidonia margins 0–15 m, shore/boat; sheltered, the best clean shore option. Coords approx.
Google MapsToday — right on the edge — wave, wind and visibility.
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 mapE-facing bay, rock/sand/posidonia margins 0–15 m, shore/boat; sheltered, the best clean shore option. Coords approx.
Google MapsRocky W shore near Neorion; sea bream and saddled bream, boat traffic.
Google MapsRocky drop-offs on the open S side, boat; the real fish ground. Keep well clear of the protected Modi islet Mycenaean wreck to the SE. Area-centroid coords.
Google MapsSheltered W bay with the Daskalio chapel islet, rock/sand, shore/boat; calm and scenic. Coords approx.
Google MapsNorth-coast bay of Poros with rocky edges; sea bream and octopus, sheltered.
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».

National minimum sizes + a 150 g floor (in the table below); grouper 1/day. Spearfishing is closed all May (ΠΔ 373/1985).
Rules change, and the local Λιμεναρχείο (port authority) may impose local restrictions. Before heading out, check the current rules and the declared archaeological zones (ENALIA).
Poros has rock entry points such as Askeli (E coast), Russian Bay / Daskalio (W) and Poros south coast (toward Modi). A narrow channel town and Argo-Saronic reefs: calm, sheltered and ideal for learning, but the water is only fair (viz 8–15 m) and the good sites are archaeology-locked. Below you'll find each spot (access, shelter and hazards) and today's forecast.
Long season, June to October (May is the national closed month). The sheltered Saronic opens on most calm mornings; peak is high summer.
Warm mediterranean water (~24–26 °C in summer, ~15 °C in winter), tideless; clear over rock but murkier near Athens' shores.
Easy access and mostly sheltered water — a good place to start, with rocky capes and islets a short hop from the city.
No paid licence is needed in Poros — the amateur one was abolished (Law 4256/2014), but a free ΟΣΠΑ registration is being introduced (check gov.gr). Breath-hold only (no scuba), a mandatory «Υ.Δ.» buoy, 16+, daytime only, and the whole of May is closed. See the guide.
Leave your email — and the moment a window opens at Poros, we'll send the go / no-go verdict. Email is all we need.
Every covered town has its own live forecast, cameras and entry points. Choose where you're diving.
What's missing? Tell us what you'd like to see — new spots, species, data or features. We read everything.