Today — right on the edge — wave, wind and noticeable surge.
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
Leave your email — and the moment a window opens at Ishigaki, 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.
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: 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 mapManta cleaning station off Kabira-Ishizaki reached by boat; 5–20 m. Currents can be strong; follow the local manta-viewing rules. Marine park zone — take nothing.
Google MapsSand-and-coral-head site south of Taketomi, 3–15 m, with shrimp gobies on the sand; boat only. Hand spear only — no speargun, no scuba.
Cameras, map and reference — to hand as you come up.
Japan: spearguns and scuba/hookah are banned for all recreational fishers nationwide (Fisheries Agency prefectural gear table); a hand spear (yasu) is allowed only in some prefectures (e.g. Okinawa, Kagoshima, Nagasaki, Kochi, Mie); abalone, lobster, octopus and sea urchin in fishery-right areas belong to the local co-op, and marine park zones are closed. Check current rules locally.
Dive sites in Nagura Bay are boat dives, 3–15 m, with coral heads, sand and some silty patches. Protected waters — take nothing.
Google MapsWest-coast beach known to divers; the Minokasago-palace reef lies about 300 m off the sand at 5–15 m. Hand spear only — no speargun, no scuba.
Google MapsBranching-coral reef with anthias schools off Osaki, 5–15 m, rubble and goby sand further out; dived from boats. Hand spear only — no speargun, no scuba.
Google MapsBlue-coral colonies lie 500 m–1 km off Shiraho beach — too far to swim; reached by local snorkel boats. Marine park zone — take nothing.
Google MapsReef starts right off Yonehara beach and the reef edge is about 200 m out. Rip currents form here and parts are closed to swimming — stay inside the reef. Marine park zone — take nothing.
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.
Ishigaki has rock entry points such as Manta Scramble (Kabira-Ishizaki), Yonehara reef and Osaki Hanagoi reef. Gateway to the Yaeyama Islands — manta rays at Kabira's cleaning stations, Yonehara's shore reef and the vast Sekisei Lagoon south-west towards Iriomote. Below you'll find each spot (access, shelter and hazards) and today's forecast.
April–November; July–October is typhoon season, and the winter northerly monsoon roughs up the sea.
21–22 °C in February, 29–30 °C in August — 3–5 mm in winter, 1.5 mm in summer.
Coral reefs and drop-offs, currents in the channels. Spearguns and scuba are banned nationwide — only a hand spear (yasu), where the prefecture allows it; shellfish, lobster, octopus and urchin in fishery-right areas belong to the co-op.
Ishigaki: Japan: spearguns and scuba/hookah are banned for all recreational fishers nationwide (Fisheries Agency prefectural gear table); a hand spear (yasu) is allowed only in some prefectures (e.g. Okinawa, Kagoshima, Nagasaki, Kochi, Mie); abalone, lobster, octopus and sea urchin in fishery-right areas belong to the local co-op, and marine park zones are closed. Check current rules locally.
