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
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 Boston, 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 mapYou can walk into the water at Castle Island (Fort Independence); the town of Boston is 2.7 km away. Access type in the Massachusetts CZM data: waterfront park. The pin sits at 42.335 N / 71.023 W on the chart. Maximum depth is around 3 m.
Google MapsAbout 3.6 km from Boston, L Street Beach is reached on foot from the shore. Access type in the Massachusetts CZM data: beach. Coordinates of the entry: 42.328 N, 71.035 W. Expect no more than about 4 m of water.
Google MapsShore access point M Street Beach, roughly 3.3 km from Boston. Access type in the Massachusetts CZM data: beach. The pin sits at 42.330 N / 71.031 W on the chart. Depths reach about 3 m.
Google MapsOrchard Beach: you go in from the shore, some 3.3 km from Boston. Mapped by Massachusetts CZM as a beach. Marker position: 42.300° N, 71.005° W. The marked spot lies about 70 m from the waterline. Expect no more than about 1.0 m of water.
Google MapsSquaw Rock: you go in from the shore, some 3.1 km from Boston. Access type in the Massachusetts CZM data: waterfront park. Marker position: 42.304° N, 71.013° W. Maximum depth is around 2.0 m.
Google MapsAbout 3.3 km from Boston, Thomas J. Butler Memorial Park is reached on foot from the shore. Mapped by Massachusetts CZM as a waterfront park. Coordinates of the entry: 42.340 N, 71.030 W. Expect no more than about 14 m of water.
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.
US spearfishing law is state-by-state. License, spearable species, powerhead rules and distances vary; federal sanctuaries (Gray's Reef, the Keys, Flower Garden Banks) ban spearfishing. Always confirm with the state agency and local ordinances.
Boston has rock entry points such as Castle Island (Fort Independence), Squaw Rock and M Street Beach. On the Massachusetts coast of United States, Boston looks south-east: the local shoreline measures 113°. Below you'll find each spot (access, shelter and hazards) and today's forecast.
Jun–Oct; Cape Cod and the islands, tautog and black sea bass.
Cool, 12–18 °C; moderate viz, best off the islands.
Intermediate: cool with headland current, best off the islands.
Yes — in Boston almost certainly, but the licence is the STATE's, not a federal one: nearly every coastal state requires its own saltwater fishing licence, and several add a free registration or an extra endorsement on top (Florida's free State Reef Fish Survey for reef fish, Texas's saltwater endorsement, California's Ocean Enhancement Validation). Hawaii asks nothing of residents and charges visitors the NRMFL. What may be speared, and with what gear, is state law too — the price and the details depend on the state, so read the «Law» block below.
