Las Grutas spearfishing forecast — Argentina

Q: Where can you spearfish in Las Grutas?

Piedras Coloradas, El Sótano, Isla Mejillón, Restinga Oliveira and Lado Bueno are the main names. The Underwater Park is diving, not hunting.

Q: What is the underwater visibility in Las Grutas today?

It can be very clear, but tide and sea state decide. Check camera, wind and tide table; enter near slack.

Q: What fish can you spear in Las Grutas?

Sea salmon, grouper, chernia, pez palo, sargo and besugo appear in the local grounds.

Q: When is the best season to spearfish in Las Grutas?

Summer brings 18-22 °C water. Autumn and winter can still give very good visibility on some reefs.

Q: Do you need a permit to spearfish in Argentina?

Yes, and it is provincial. In Las Grutas you check Río Negro and Ley 5.706/2024.

Las Grutas · Argentina

5.4

wave 0.4 m

visibility5m

Today — right on the edge — wave, wind and visibility.

Sources: IPMA · NDBC · Copernicus — high confidence · data 16:33

Sources & confidence

Sources: IPMA · NDBC buoys · Copernicus Marine
Method: Model consensus, read per window
Freshness: Re-read every hour, per coast

Compiled by the spearo sea-state engine

The verdict comes from seven water factors and hard safety gates — not ten tabs. Go or stay.

How we score the water

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.

Swell & wave memory: Height, period and direction of the swell, plus the wake of recent storms — an old storm still stirs the water, and the engine remembers.
Wind & gusts: Speed and gusts, hour by hour — wind speed and an onshore push chop the surface and cut visibility.
Tide phase: Timing and range of the tide, calibrated per coast — big spring tides pull the verdict toward caution.
Water temperature: Sea-surface temperature — sharply cold water vetoes a green verdict.
Currents & outflow: Direction and drift of the current — it pushes you, and it drags turbid coastal water across where you dive.
Rain runoff & air clarity: Rain muddies the water inshore through land runoff, while fog and haze cut visibility at the surface.
Coast shape & exposure: How the coast faces the swell — a sheltered cove keeps the water clean; an exposed, head-on point takes a penalty.

Safety gates

Thunderstorm forecast — an instant red, no exceptions.
An official warning (MeteoAlarm / IPMA) — yellow, or red for the higher ranks.
Missing input data — a would-be green is capped to yellow rather than overstated.
Strong disagreement between forecast models — a green day is pulled back to yellow.
Night hours — forced red; the window is closed after dark.

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

Entry points with coordinates

Seabed relief — promising ground

This verdict — in your pocket. Open the app for the week's window.

Android: the public release is in Google Play review — leave your email and we'll send beta access today.

Android beta — QR code — point your camera

0 m

Surface

Wind, wave and the swell windows — when to go and the best hours.

spearo.app

calmupdated 16:33

Las Grutas — solo, off the rocks

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caution — solo off the rocks is risky, check on site · wind-wave — choppy surface

wave 0.4 mwind 17, gusts 26 km/hvisibility ~7 mwindow 15:00–21:00

today, best window 15:00–18:00

fish · Visibility 7 m · Water 9.1°C

confidence low · verdict for the selected day

Before entering, check the camera and the surge

Whole week — tap a day. is driving swell right now.

Solo risk: carry a float · tell someone your plan and exit time · doubt = don't go. A model-based planner; the call is made on site.

Selected day

Windows, hours
and the day's trends.

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.

Wednesday · today2026-07-22

08:35–18:18 · first quarter

▲ 05:00▼ 12:00▲ 18:00mid-range tides · 5.8 m

Hours (06→20)

Day's trends

Tide-2.70 m

Wave0.42 m

Wind13 km/h

Water9 °C

fish activity: moonset 02:45 · moderate · moon underfoot 07:40 · high · moonrise 12:40 · moderate · moon overhead 20:10 · high

Conditions window15:00–18:00

caution — solo off the rocks is risky, check on site fish

Hs 0.40 mperiod 7.4 swind 17→26surge 0.4viz 5 m

0.40 mup to ~0.80 · 123° at an angle

7.4 sswell moderate

17→26gusts 26 km/h

0.4weak surge

0.11m/s

5 mrecent swell

9.1°Cthicker suit + hood

▲18:00tide turn near

Atmosphere25 kmovercast

lowoff the lunar peaks

wind-wave — choppy surface
wind 17 km/h
flood toward high water

confidence lowtwilight

Open the seafloor map with entry points

Your best window — with you. Forecast in your pocket.

Android: the public release is in Google Play review — leave your email and we'll send beta access today.

−10 m

The water column

Visibility and what drives it — post-storm clearing, river plume, temperature and the thermocline.

What it is

A marine instrument,
go / no-go for solo hunting.

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: 1152 spots across 189 stretches of coast — mainland Portugal, Madeira and the Azores.

See all spots

−20 m

The seabed

Relief and bottom type, tides, and the depths of each spot.

On the rock

The forecast is the plan.
The call is on the rock.

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.

Entry points

Where to get in
off the rocks.

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 map

El BuqueLas Grutas

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