Perth Marine Forecast
Updated Tue Oct 27, 2026
Thursday is the clear pick; Tue and Wed need timing
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Marine Forecast for Perth Oct 27–29, 2026
📋 Thursday is the clear pick; Tue and Wed need timing
CAUTION: steep chop and a cross-sea from a WSW swell and SE wind-wave. Lull from 9:00 AM to 2:00 PM, then 22 kt south winds gusting to 30 kts build. Not suited to a 12 hour trip.
CAUTION: best 12 hour stretch is 1:00 AM to 7:00 PM, but expect chop and a SW swell crossing an ESE wind-wave. Gusts reach 28 kts after 7:00 PM, so be ashore by then.
GO: light 2-12 kt winds and a gentle 2.8-3.1 ft SW swell at 10-12 seconds. Any time works for a 12 hour trip, calmest from 3:00 AM to 9:00 AM. High confidence.
It depends on the day: Thursday, October 29 is a clean GO with light winds and long-period SW swell, while Tuesday and Wednesday are CAUTION days with steep wind-wave chop and crossed seas from the south and southeast. Forecast confidence is moderate on Tuesday (72%) and Wednesday (66%), with wind and gust models disagreeing, but high on Thursday (92%).
Recent days at Perth
Today’s Water at Perth
Sea surface temperature and chlorophyll around Perth, imaged fresh every morning. Water at the star is 19.1°C today, and chlorophyll of 0.48 mg/m³ reads as green shelf water at the spot.
Imagery: Oct 27, 2026 · rebuilt every morning
These charts show you the breaks. DeepCast reads them. A zone-by-zone AI fishing report for these exact waters — temperature edges, color changes, and structure, analyzed together.
Get the AI fishing reportSST and chlorophyll from the SeaLegs AI DeepCast satellite pipeline. Charts are a planning aid — always check the official marine forecast before making the run.
About Perth
Boating out of Perth runs on a clock. Through the warmer months the morning is usually the calm part of the day and the afternoon belongs to the Fremantle Doctor — the southwesterly sea breeze that arrives with near-daily reliability and turns the water over.
The outlook below updates every morning from the latest marine model data, and each day gets an honest GO, CAUTION, or NO-GO call — the same AI rating used in the SeaLegs AI app.
Reading the Fremantle Doctor
The Doctor is a southwesterly sea breeze that commonly blows 15 to 20 knots and typically sets in somewhere between late morning and mid-afternoon — often around the early afternoon — and it is at its strongest in December and January, when the temperature difference between land and sea is greatest. It is welcome relief ashore. On the water it means a short, building chop through the afternoon.
The practical consequence is that Perth days are usually decided by timing rather than the daily average. A forecast that reads moderate across the day can still offer a genuinely calm morning window and a difficult afternoon one. If you're heading offshore, plan to be well on your way back before the breeze fills in, and read the hour-by-hour trend below rather than the day's headline number.
Perth forecast FAQ
How is the sea at Perth today?
As of Oct 27, 2026, the SeaLegs AI verdict for Perth is CAUTION. CAUTION, so timing and tolerance matter. Seas stay steep, short-period wind-wave chop for much of the day, and a confused cross-sea develops as a WSW swell crosses a SE wind-wave: two wave trains arrive from different directions, making for awkward, uncomfortable motion with no single good heading. Winds start at 18-19 kts from the south-southeast with gusts to 27 kts, ease to 8-11 kts by mid-morning, then rebuild from the south-southwest to 22 kts with gusts near 30 kts from the afternoon into the evening, with 3.5-3.7 ft seas at only 6 seconds. The comfortable lull is roughly 9:00 AM to 2:00 PM, shorter than a 12 hour trip. Model confidence is moderate at 72%, with wind speed models disagreeing.
What is the Fremantle Doctor?
It's the southwesterly sea breeze that blows into Perth on most warm-season afternoons, commonly at 15 to 20 knots. It usually arrives somewhere between late morning and mid-afternoon and is strongest in December and January. For boaties it's the main reason mornings are typically the calmer part of a Perth summer day.
How accurate is this Perth marine forecast?
The outlook is generated from the latest marine model data and rated GO, CAUTION, or NO-GO by the same AI engine used in the SeaLegs AI app. It's a planning aid, not a substitute for the Bureau of Meteorology's coastal waters forecast and marine warnings — always check those before heading out.
How often is this forecast updated?
The page is rebuilt every morning from the latest model run, and the SpotCast card refreshes live in your browser. The date stamp above the outlook shows when it was last generated.
What do GO, CAUTION, and NO-GO mean?
GO means conditions are favourable for most recreational boats. CAUTION means marginal — manageable for experienced crews in capable vessels, but check the wind and sea timing closely. NO-GO means conditions are hazardous for small craft and the trip is best postponed.
What is the water temperature at Perth today?
As of Oct 27, 2026, the satellite-derived sea surface temperature at Perth is about 19.1°C, with chlorophyll around 0.48 mg/m³ (green shelf water). The SST and chlorophyll charts on this page are rebuilt every morning from the SeaLegs AI DeepCast satellite pipeline.
More offshore forecasts
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