Western Australia Surf Forecast by Craig Brokensha (issued Friday 1st September)

Best Days: Perth and Mandurah Saturday and Sunday mornings, all locations Monday morning and Tuesday morning, swell magnets each morning for the rest of the week

Recap

Poor conditions across all locations yesterday with no major size and onshore wind. Today there was a bit more swell but conditions remained very average.

This weekend and next week (Sep 2 - 8)

A weakening cold front is currently pushing up past us, with it forming earlier this week around Heard Island, projecting a great fetch of SW gales towards us, generating a large SW groundswell for tomorrow morning.

There's been no change to the expected size from this system with exposed breaks in the South West due to come in around 10ft with 3-4ft sets further north around Mandurah, 3ft in Perth.

With the front pushing up past our coast instead of across us and to the east, winds will remain onshore and from the S/SW across Margs, favouring protected spots. Perth and Mandurah are now expected to see morning S/SE winds, creating good conditions in protected spots.

The swell should ease into Sunday from 6ft to occasionally 8ft around Margs but another vigorous polar front pushing towards the Bight will keep SW winds blowing across the coast.

Mandurah and Perth should be clean with E/SE offshores and easing 2-3ft sets.

Monday's S/SW groundswell is looking excellent, with a vigorous and broad polar frontal progression firing up towards the Bight under the influence of a strengthening node of the Long Wave Trough due to generate an elongated fetch of SW gales through our southern swell window.

A large long-period S/SW groundswell will result, peaking Monday morning to 8-10ft across exposed breaks in the South West and 2-3ft in Mandurah, 2ft+ around Perth.

Winds look excellent as a ridge of high pressure moves in from the west, bringing morning E/SE offshores to the South West and morning E'ly offshores around Perth and Mandurah.

The swell will start to ease into the afternoon, dropping rapidly Tuesday from the 6ft range across the South West and 2ft to the north. Conditions look to remain great with light E/NE offshores and afternoon sea breezes.

There's no major swells due for the rest of the week, with small SW swells due to spread off pre-frontal W/NW fetches.

Conditions will be clean each morning with sets likely to hang around 3-4ft at magnets in the South West, 1ft further north. More on this Monday, have a great weekend!