Southern Islands (Sisters' & Hantu) spearfishing forecast — wind, swell, visibility, tides & live cameras

spearo.app / Singapore / Southern Islands (Sisters' & Hantu)
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◈Southern Islands (Sisters' & Hantu) · Singapore
5.2
wave <0.1 m head-on
visibility~2m

Marginal

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

Sources: Open-Meteo · Copernicus — high confidence · data 23:16

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.

Coming soon

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Spots in Singapore

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  • Pulau Tioman
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spearo.app · a private marine instrument · Southern Islands (Sisters' & Hantu) · a planner, not a safety guaranteePrivacy
Today
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0 m

Surface

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

spearo.app
updated 23:16
Southern Islands (Sisters' & Hantu) — solo, off the rocks
BORDERLINE
caution — solo off the rocks is risky, check on site · current 0.42 m/s
wave <0.1 m head-onwind 8 km/hvisibility ~2 mwindow 18:00–21:00
today, best window 18:00–21:00
fish · Visibility 2 m · Water 30.3°C
confidence medium · verdict for the selected day
Best window · next 3 days
borderlinetoday · 18:00–21:00
you can see ~2 m ahead fish

Tell me when it's on

Just your email — nothing else needed.

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
06:48–18:53 · waxing crescent
▲ 00:00▼ 06:00▲ 12:00▼ 18:00 · 2.5 m
Hours (06→20)
06
09
12
15
18
Day's trends
Tide1.26 m
Wave0.08 m
Wind5 km/h
Water30 °C
fish activity: moon underfoot 02:20 · high · moonrise 08:35 · moderate · moon overhead 14:40 · high · moonset 20:54 · moderate
Conditions window09:00–12:00
don't go fish
Hs 0.04 m · calmperiod 2.7 s head-onwind 8→17surge 0viz 2 m
0.04 mcalm · up to ~0.08 · 110° head-on
2.7 sswell moderate
8→17gusts 17 km/h
0weak surge
1.06m/s
2 mrain and mountain runoff
30.2°C5 mm + hood
▲12:00tide turn near
Atmosphere5 kmovercast
moderatemoonrise
  • current 1.06 m/s
  • murky water (visibility ~2 m)
  • flood toward high water
confidence mediumday
Open the seafloor map with entry points →

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

Download on theApp StoreGET IT ONGoogle Play
Google Play — QR code
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 →
Kusu IslandSouthern Islands (Sisters' & Hantu)
borderline
⚠ Restrictions apply
exposed head-on to the swell today
window
—

Shore of a named islet/cape/beach, near shore. Point placed on the shore of a gazetteer feature; not a confirmed dive or hunting site — unverified.

Google Maps
Pulau Hantu SouthSouthern Islands (Sisters' & Hantu)
borderline
⚠ Restrictions apply
exposed head-on to the swell today
window
—

Listed dive site, typical depth 18 m, max 28 m, near shore. Coords from a dive-site database, approx.

Google Maps

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

    Singapore has no recreational spearfishing framework: discharging a spear gun is prohibited in all NParks parks including beach and marine parks (Parks and Trees Regulations, reg. 4(fa)), and coastal waters are busy port waters. Treat as no-hunting.

    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 Southern Islands (Sisters' & Hantu)

    Pulau SemakauSouthern Islands (Sisters' & Hantu)
    borderline
    ⚠ Restrictions apply
    exposed head-on to the swell today
    window
    —

    Shore of a named islet/cape/beach, near shore. Point placed on the shore of a gazetteer feature; not a confirmed dive or hunting site — unverified.

    Google Maps
    Raffles Lighthouse JettySouthern Islands (Sisters' & Hantu)
    borderline
    ⚠ Restrictions apply
    exposed head-on to the swell today
    window
    —

    Listed dive site, typical depth 12 m, max 20 m, near shore. Coords from a dive-site database, approx.

    Google Maps
    Sisters' IslandsSouthern Islands (Sisters' & Hantu)
    borderline
    ⛔ Banned here
    exposed head-on to the swell today
    window
    —

    Shore of a named islet/cape/beach, near shore. No hunting — Sisters' Islands Marine Park; freediving/visibility point. Point placed on the shore of a gazetteer feature; not a confirmed dive or hunting site — unverified.

    Google Maps
    St John's IslandSouthern Islands (Sisters' & Hantu)
    borderline
    ⚠ Restrictions apply
    exposed head-on to the swell today
    window
    —

    Shore of a named islet/cape/beach, near shore. Point placed on the shore of a gazetteer feature; not a confirmed dive or hunting site — unverified.

    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.

    Where can I spearfish in Southern Islands (Sisters' & Hantu)?

    Southern Islands (Sisters' & Hantu) has rock entry points such as Sisters' Islands, Pulau Hantu South and Raffles Lighthouse Jetty. The reefs south of the main island: Pulau Hantu, Kusu, St John's and the Sisters' Islands, reached from Marina South Pier. Below you'll find each spot (access, shelter and hazards) and today's forecast.

    When is the best season in Southern Islands (Sisters' & Hantu)?

    Year-round; best February–April and June–September between the monsoons; visibility 1–5 m.

    How cold is the water in Southern Islands (Sisters' & Hantu)?

    28–30 °C all year — a rashguard or 1.5–3 mm.

    Is Southern Islands (Sisters' & Hantu) good for a beginner?

    Busy port waters and the fringing reefs of the Southern Islands; discharging a spear gun is banned in all NParks parks and Sisters' Islands Marine Park is closed — treat as no-hunting.

    Do I need a licence in Southern Islands (Sisters' & Hantu)?

    Southern Islands (Sisters' & Hantu): Singapore has no recreational spearfishing framework: discharging a spear gun is prohibited in all NParks parks including beach and marine parks (Parks and Trees Regulations, reg. 4(fa)), and coastal waters are busy port waters. Treat as no-hunting.

    Data partners
    dive centres that send us real visibility readings
    Águas VivasMilfontes · Sagres