Hon Son (Lai Son) spearfishing forecast — wind, swell, visibility, tides & live cameras

spearo.app / Vietnam / Hon Son (Lai Son)
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◈Hon Son (Lai Son) · Vietnam
5.3
wave 0.1 m
visibility~3m

Marginal

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

Sources: Open-Meteo · Copernicus — high confidence · data 21:01

Sources & confidence

Sources
Open-Meteo · Copernicus
Method
spearo sea-state engine: consensus of up to 6 models + satellite clarity (ZSD) + buoy-bias checks
Freshness
Re-read every hour, per coast

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.

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.

01
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.
02
Wind & gusts
Speed and gusts, hour by hour — wind speed and an onshore push chop the surface and cut visibility.
03
Tide phase
Timing and range of the tide, calibrated per coast — big spring tides pull the verdict toward caution.
04
Water temperature
Sea-surface temperature — sharply cold water vetoes a green verdict.
05
Currents & outflow
Direction and drift of the current — it pushes you, and it drags turbid coastal water across where you dive.
06
Rain runoff & air clarity
Rain muddies the water inshore through land runoff, while fog and haze cut visibility at the surface.
07
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 — where night spearfishing is banned by law the window is forced red; where it is legal (Australia outside NSW, New Zealand, South Africa) it is capped at yellow, never green.

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.

Entry pointsNo-take zones

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.

Download on theApp StoreGET IT ONGoogle Play
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point your camera
0 m

Surface

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

spearo.app
updated 21:01
Hon Son (Lai Son) — solo, off the rocks
BORDERLINE
caution — solo off the rocks is risky, check on site · wind 15 km/h
wave 0.1 mwind 15 km/hvisibility ~3 mwindow 06:00–18:00
today, best window 06:00–09:00
fish · Visibility 3 m · Water 30.7°C
confidence medium · verdict for the selected day
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.

Tuesday · today2026-10-13
05:49–17:45 · waxing crescent
▲ 04:00▼ 12:00▲ 18:00▼ 22:00mid-range tides · 0.6 m
Hours (06→20)
06
09
12
15
18
Day's trends
Tide0.79 m
Wave0.16 m
Wind10 km/h
Water31 °C
fish activity: moon underfoot 01:20 · high · moonrise 07:46 · moderate · moon overhead 13:40 · high · moonset 19:35 · moderate
Conditions window06:00–09:00
caution — solo off the rocks is risky, check on site fish
Hs 0.14 m · calmperiod 3.1 swind 15→23surge 0viz 3 m
0.14 mcalm · up to ~0.28 · 210° at an angle
3.1 sswell moderate
15→23gusts 23 km/h
0weak surge
0.17m/s
3 mrain and mountain runoff
30.7°C5 mm + hood
▼12:00tide falling
Atmosphere6 kmprecip 0.4 mm
moderatemoonrise
  • wind 15 km/h
  • ebb — weaker inshore
confidence mediumtwilight
Open the seafloor map with entry points →
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More spots

Spots in Vietnam

🇻🇳Vietnam

Vietnam map →

Nearby towns

  • Nam Du islands
  • Phu Quoc
  • Con Dao
  • Vung Tau
  • Ko Kood

Southeast Vietnam

  • Ho Coc (Ho Tram)
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  • Phu Quy

South Central Coast

  • Vinh Hy (Phan Rang)
  • Cam Ranh
  • Nha Trang
  • Van Phong Bay (Dam Mon)

Central Vietnam

  • Tuy Hoa (Phu Yen)
  • Quy Nhon
  • Ly Son
  • Hoi An (Cu Lao Cham)
  • Da Nang
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spearo.app · a private marine instrument · Hon Son (Lai Son) · a planner, not a safety guaranteePrivacy
Today
Notify me
Map
Best window · next 3 days
borderlinetoday · 06:00–09:00
you can see ~3 m ahead fish

Tell me when it's on

Just your email — nothing else needed.

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

Download on theApp StoreGET IT ONGoogle Play
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point your camera
−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: 3016 spots across 406 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 →
Hon Son east coastHon Son (Lai Son)
borderline
No named marine park found here. Fisheries Law 2017 (art. 7): no explosives, poison, electric shock or banned gear; never take protected species; treat compressor/scuba hunting as banned. Check provincial rules locally.
exposed head-on to the swell today
window
—

Rocky point, 2–10 m, by boat. Coords approx.

Google Maps
Hon Son south isletsHon Son (Lai Son)
borderline
No named marine park found here. Fisheries Law 2017 (art. 7): no explosives, poison, electric shock or banned gear; never take protected species; treat compressor/scuba hunting as banned. Check provincial rules locally.
exposed head-on to the swell today
window
—

Islet reef and rocks, 2–12 m, by boat. Coords approx.

Google Maps
Hon Son west capeHon Son (Lai Son)
borderline
No named marine park found here. Fisheries Law 2017 (art. 7): no explosives, poison, electric shock or banned gear; never take protected species; treat compressor/scuba hunting as banned. Check provincial rules locally.
exposed head-on to the swell today
window
—

Rocky point, 2–10 m, from shore. Coords approx.

Google Maps
Hon Son — Bai BangHon Son (Lai Son)
borderline
No named marine park found here. Fisheries Law 2017 (art. 7): no explosives, poison, electric shock or banned gear; never take protected species; treat compressor/scuba hunting as banned. Check provincial rules locally.
exposed head-on to the swell today
window
—

Fringing reef, 1–8 m, from shore. Coords approx.

Google Maps

SOLO 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.

One morning glance — and you know.

Download on theApp StoreGET IT ONGoogle Play
Google Play — QR code
point your camera
≈

Surfacing

Cameras, map and reference — to hand as you come up.

Live cameras, map & reference
Open the seafloor map →
Reference

What's in season,
what the law says.

In season now
  • no targets this month
Law

    Vietnam has no national speargun ban: spearguns and compressors are not on the banned-gear list (Circular 19/2018 as replaced by Circular 01/2022), but the Fisheries Law 2017 (art. 7) bans all fishing in the strict and restoration zones of marine protected areas. Nha Trang Bay (Hon Mun), Cu Lao Cham, Ly Son, Con Dao and Nui Chua are closed to spearfishing in those zones; never take protected species. Check provincial rules locally.

    Safety protocol
    • Sets: watch the wave trains ≥15 min before entering; Hmax ≈ 2×Hs, the wash can run 50 m past the foam line. A lull >10 min with period >12 s = a big set «overdue», do NOT enter; enter right after a full set passes and re-check at minute 30.
    • Exit FIRST: find your exit AND a backup before entering. On a rocky/boulder shore a 0.5 m rise in swell can make the exit impossible — getting pinned/unable to climb out is the main killer.
    • Headland rip: prominent points often have a permanent topographic rip regardless of the model — locate it, enter/exit on the windward side, never swim against it.
    • Cold: wetsuit per the SST chip; the first shiver = a metabolic surge and a drop in breath-hold → get out at the first steady shiver. Cap the session at 45–60 min below 15 °C.
    • Solo discipline: buoy up; tell someone the spot and exit time; conservative breath-hold (never push it in cold/murky/surfy water); visibility <3 m — don't enter.
    • Afternoon wind: on many coasts the wind builds from midday — plan to be out of the water by midday; the chop builds — get out.
    • UV 11:00–15:00 (UVI ≥6): sunscreen and cover up on the surface interval.
    • Solo is a fundamental risk (hypoxic blackout with no buddy). Any doubt = No-go.

    FAQ — spearfishing in Hon Son (Lai Son)

    Where can I spearfish in Hon Son (Lai Son)?

    Hon Son (Lai Son) has rock entry points such as Hon Son — Bai Bang, Hon Son west cape and Hon Son east coast. Hon Son (Lai Son): Hon Son (Lai Son). Below you'll find each spot (access, shelter and hazards) and today's forecast.

    When is the best season in Hon Son (Lai Son)?

    November–April; from May to October the southwest monsoon makes the west coast rough.

    How cold is the water in Hon Son (Lai Son)?

    About 27–30 °C; visibility 5–10 m in the dry season.

    Is Hon Son (Lai Son) good for a beginner?

    Easy: shallow warm reefs; spearfishing banned in the strict zones of the Phu Quoc MPA.

    Do I need a licence in Hon Son (Lai Son)?

    Hon Son (Lai Son): Vietnam has no national speargun ban: spearguns and compressors are not on the banned-gear list (Circular 19/2018 as replaced by Circular 01/2022), but the Fisheries Law 2017 (art. 7) bans all fishing in the strict and restoration zones of marine protected areas. Nha Trang Bay (Hon Mun), Cu Lao Cham, Ly Son, Con Dao and Nui Chua are closed to spearfishing in those zones; never take protected species. Check provincial rules locally.

    Northern Vietnam (Gulf of Tonkin)

    • Cat Ba
    • Co To

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