Dive today — 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 Hell-Ville (Nosy Be), 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 mapReef around a small island, from waist-deep off the beach to 12 m, boat to the island, then entry from its beach. Night diving is banned in the park. No hunting — inside Nosy Tanikely National Park. Coords from a dive-site database, approx.
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.
Madagascar: recreational and sport fishing require a protocol and a licence from the Fisheries Ministry (Loi 2015-053 art. 41–42; Décret 2016-1492 art. 27). Rules on spearfishing with scuba and at night are not confirmed. Marine national parks such as Nosy Tanikely and Nosy Hara ban all fishing, spearfishing included. Check locally before diving.
Hell-Ville (Nosy Be) has rock entry points such as Nosy Tanikely reef. Hell-Ville (Andoany) is the main town of Nosy Be, on the island's sheltered south coast, and the harbour for boats to Nosy Tanikely and Nosy Komba. Below you'll find each spot (access, shelter and hazards) and today's forecast.
Dry season May–October with the clearest water; NW swell and cyclones December–March.
Warm tropical water and large tides — time dives with them.
Easy to moderate: the lee of Nosy Be, most marks by boat; currents some days at Nosy Komba.
Hell-Ville (Nosy Be): Madagascar: recreational and sport fishing require a protocol and a licence from the Fisheries Ministry (Loi 2015-053 art. 41–42; Décret 2016-1492 art. 27). Rules on spearfishing with scuba and at night are not confirmed. Marine national parks such as Nosy Tanikely and Nosy Hara ban all fishing, spearfishing included. Check locally before diving.
