Today — sit it out — wave, wind and surge pounding.
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 Manazuru, 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 mapEntry down a concrete slipway with a guide rope that leads over cobbles, sand, rocky reef and sunken caissons. The bay is calm on most days of the year. Spearing not permitted in Kanagawa — check local rules.
Google MapsEntry from a small cove formed by tetrapods, then out onto flat rippled sand with a large rock at about 9–10 m. Average 7–8 m and up to 15 m, with little current in the inner bay. Spearing not permitted in Kanagawa — 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.
Roped entry down a cobble slope that runs about 100 m out to a wide sandy plain. Average 10 m and up to 20 m, with almost no current. Old cut stones lie on the bottom. Spearing not permitted in Kanagawa — check local rules.
Google MapsEntry straight off the small sandy Iwa beach. The bottom is sand all the way out, so the site is used for training and night dives. Spearing not permitted in Kanagawa — check local rules.
Google MapsThe second Iwa shore entry, reaching a flat sandy bottom down to about 13 m. Easy conditions, often used for courses. Spearing not permitted in Kanagawa — check local rules.
Google MapsReef, rocky reef, 2–15 m, from shore. Spearing not permitted in Kanagawa — check local rules. Coords approx.
Google MapsReef, rocky point, 3–20 m, from shore. Spearing not permitted in Kanagawa — check local rules. Coords approx.
Google MapsSingle entry down a slope with a guide rope in front of the dive centre. Sand with scattered artificial reefs in front and a cobble zone with old platform remains to the east, down to 14 m. Spearing not permitted in Kanagawa — 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.
Manazuru has rock entry points such as Mitsuishi, Iwa Beach and Kotogahama. A small cape at the corner of Sagami Bay where Izu begins — Mitsuishi rocks, Iwa beach and Kotogahama, a classic Kanagawa shore-dive and freediving training coast. 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.
Manazuru: 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.
