Today — right on the edge — 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
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 Portsmouth, 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 mapRocky point at the Piscataqua mouth beside the historic fort, 1–8 m. Sheltered ledges with tautog and cunner, but the river pushes hard — dive the slack and stay clear of the shipping channel. Pinned at the shore access, not in the water: the entry point is still unchecked.
Google MapsGranite ledge and old fort rubble at Jerry's Point on the southeast corner of New Castle Island, 2-12 m. Cunner, pollock and tautog in the rock; the Piscataqua tide sweeps the point hard, so work the slack and stay inside the point. Pin: shore access; water entry unverified.
Google MapsCobble and ledge shore of the New Castle town common looking out on the harbour mouth, 2-9 m. Cunner, pollock and flounder over rock and sand; an easy park entry with parking, but the same Piscataqua current applies. Pin: shore access; water entry unverified.
Google MapsCharted ledge at the mouth of Gosport Harbor between Star and Smuttynose Islands, 3–12 m, marked by a bell buoy. Clean water — cunner and pollock. A NH licence is required and is also honoured in Maine and Massachusetts.
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.
Check the cam BEFORE you leave. Foam, brown/green murk, or waves washing the entry rocks = No-go. At night/in fog the cam is useless — treat it as «unknown», NOT «green».
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.
Portsmouth has rock entry points such as Isles of Shoals — Gosport Harbor Entrance Ledges, Fort Constitution / New Castle Harbor-Mouth Ledges and Fort Stark (Jerry's Point). Portsmouth fronts the Piscataqua and the Isles of Shoals — clear-water ledges for cunner, pollock and tautog. Below you'll find each spot (access, shelter and hazards) and today's forecast.
Tiny coast, a Jul–Sep window in the summer calms.
Cold, 10–16 °C in summer; viz best on flat days.
Intermediate–advanced: cold, short season, dive the calms.
Yes — in Portsmouth 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.
