Western Australia Surf Forecast by Craig Brokensha (issued Wednesday December 7th)

Best Days: Now, Saturday morning, Sunday morning in the South West

Features of the Forecast (tl;dr)

• Easing SW groundswell with early S/SE tending S/SW-W/SW winds tomorrow AM
• Small Fri, with a building mid-period SW swell with S/SW-W/SW winds (possibly variable S in the South West early)
• Moderate sized + SW swell Sat AM, easing with S/SE tending strong S/SW winds
• Easing surf Sun with SE tending strong S/SW winds
• Fading surf early next week with morning E winds

Recap

Windy conditions and building surf through yesterday across the South West, consisting mostly of windswell in Perth and Mandurah through the afternoon and groundswell in the South West.

Today is the pick though with offshore winds and clean conditions across all locations, 5-6ft on the sets in the South West and glassy right now, 1-2ft in Mandurah and 1.5ft across Perth. Make the most of the current clean conditions before winds change into the end of the week.

This week and next (Dec 8 - 16)

The current swell will continue to ease into tomorrow and an inland heat low will drop south and then south-east, bringing a shift in winds from E/SE-SE pre-dawn in the South West, to the S/SE at dawn and then S/SW-W/SW from mid-late morning.

With the smaller swell and dicey window of winds in the South West, it's not worth worrying too much about.

Onshore winds will unfortunately linger into Friday out of the S/SW in Perth and Mandurah, shifting W/SW through the day, while Margs may see a period of more variable S'ly winds early.

Swell wise, a new mid-period SW swell is due Friday morning ahead of a stronger and better pulse Saturday.

Both swells are being generated by a broad, healthy low that's south-west of us, with a pre-frontal fetch of strong W/NW winds due to be followed by a better aligned fetch of W/SW-SW winds, projecting north-east.

Friday's isn't expected to provide any real size, but Saturday's should offer 5-6ft sets in the South West, 2ft waves across Mandurah and 1-2ft sets in Perth. Winds should improve slowly on the weekend, with protected spots fairing best Saturday morning under a S/SE breeeze, better Sunday with a SE offshore but smaller, easing sets from 3-4ft, tiny in Perth and Mandurah.

Unfortunately we'll see the surf bottoming out into next week as winds swing more E'ly and a strong blocking high sits to our south-west.

There's nothing major due at all unfortunately with a mid-latitude low possibly bringing building, onshore surf next weekend. More on this Friday though.