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Long sand beach in Aharen village known for coral and reef fish close in, facing uninhabited Hanare Island. Lifeguards late April to October. Marine park zone — take nothing.
Google MapsToday — right on the edge — 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 Zamami, 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 mapLong sand beach in Aharen village known for coral and reef fish close in, facing uninhabited Hanare Island. Lifeguards late April to October. Marine park zone — take nothing.
Google MapsShallow, gently shelving sand beach west of Zamami village where green turtles feed close in; best at high tide. Lifeguards from late April to October. Marine park zone — take nothing.
Google MapsReef, coral heads, 5–20 m, by boat. Marine park zone — take nothing.
Google MapsZamami's main beach east of the port; the bottom drops off fairly quickly so coral and reef fish start close to the waterline. Lifeguards late April to October. Marine park zone — take nothing.
Google MapsStraight white-sand beach on the north of Aka Island with shallow water over varied coral; the reef further out is a known dive site. Lifeguards late April to October. Marine park zone — take nothing.
Google MapsTopography site off Zamami with intricate caves and tunnels lit by light shafts; suited to intermediate divers. Marine park zone — take nothing.
Google MapsReef, coral slope, 5–25 m, by boat. Marine park zone — take nothing.
Google MapsReef, coral slope, 5–20 m, by boat. Marine park zone — take nothing.
Google MapsSheltered 800 m sand beach on Tokashiki's west side; shallow water with seagrass where green turtles often feed. Swimming outside lifeguard hours is at your own risk. Marine park zone — take nothing.
Google MapsReef, coral slope, 5–25 m, by boat. 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.
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.
Zamami has rock entry points such as Nita Cave, Ama Beach and Ama Ushiji. The Kerama Islands, 35 km west of Naha — famous 'Kerama blue' water, coral gardens and turtles around Zamami, Aka and Geruma. 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.
Zamami: 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.
transparency ~32 m · satellite, yesterdaysatellite estimate · may differ right at the shore