Today — sit it out — wave, wind and surge pounding. 💧 Water should clear by Thursday (~2d)
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 Ito, 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 mapBeach point at the Akazawa dive centre with a handrail at the entry; wide sand bottom to a maximum of about 12 m with almost no current, protected by breakwaters from north-easterlies. Spearing not permitted in Shizuoka — check local rules.
Google MapsShore entry at Futo harbour beaches (Yokobama) over rock and boulders; sand starts around 6–8 m and the reef runs to about 30 m. Futo Hole is only reachable at high tide; this is a managed dive area with boat traffic from the harbour. Spearing not permitted in Shizuoka — check local rules.
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.
Second Futo beach just north of Yokobama; enter over boulders onto sand that begins around 6–8 m. Rays and squid spawning in early summer; boat traffic from Futo harbour nearby. Spearing not permitted in Shizuoka — check local rules.
Google MapsLong white-sand beach dive at Inatori, average about 5 m and maximum 15 m with no notable current. Calmest when north-easterlies blow. Spearing not permitted in Shizuoka — check local rules.
Google MapsEntry from the small harbour in front of the Ginsuiso hotel; guide rope over white sand, average about 5 m, maximum 15–17 m. Current is occasional. Spearing not permitted in Shizuoka — check local rules.
Google MapsBeach entry at the Izu Ocean Park dive centre onto lava boulders that drop to sand; the sheltered Okuridashi cove is 3–6 m, the main 1-no-ne pinnacle runs 5–26 m and outer pinnacles reach 30–35 m. Current can pick up on the outer reefs; the site is a paid, managed dive centre and closes in big swell. Spearing not permitted in Shizuoka — check local rules.
Google MapsWall / drop-off, lava cliffs, 3–25 m, from shore. Spearing not permitted in Shizuoka — check local rules. Coords approx.
Google MapsBeach entry down a slope with handrail at Kawana harbour; rocky reef on the right, sand and sandy mud on the left, average about 8 m and maximum around 18 m. Little current inside the bay; sea turtles are resident. Spearing not permitted in Shizuoka — check local rules.
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.
Ito has rock entry points such as Izu Ocean Park (IOP), Futo and Kawana. East Izu's hub on Sagami Bay — Izu Ocean Park, Futo and the Jogasaki lava coast are Tokyo's go-to shore dives, soft corals and big schools within a few fins. Below you'll find each spot (access, shelter and hazards) and today's forecast.
June–November; the Kuroshio keeps the water warm into late autumn, winter brings the north-west monsoon, and typhoons come August–October.
14–17 °C in February–March, 26–28 °C in August — 5–7 mm in winter, 3 mm in summer.
Rocky capes and reefs, Pacific swell and currents off the points. 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.
Ito: 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.
