Western Australia Surf Forecast by Craig Brokensha (issued Wednesday 18th September)

Best Days: Protected spots tomorrow and Friday in the South West, cleaner to the north, Saturday morning, Sunday and Monday mornings in the South West

Recap

Light winds and clean conditions for a period yesterday morning across the South West with 3-4ft of swell, a fun 1-2ft to the north.

Today the swell is still small and the winds onshore across Perth and Mandurah, lifting a little in size across the South West with a new S/SW groundswell though below forecast expectations.

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This week and weekend (Sep 19 - 22)

The onshore winds currently seen across the state are due to a strong polar front pushing up and towards us, though this is now looking a little weaker than forecast on Monday, with a slight downgrade in the expected size.

Tomorrow will consist of mostly windswell and mid-period energy with the groundswell energy from the front arriving Friday.

Size wise, the South West looks to be around a messy 8ft+ tomorrow, 3ft in Mandurah and Perth along with strong but easing S/SW winds.

Friday should see more power to the swell with Margs easing from 8ft to possibly 10ft, 3ft in Mandurah and 2-3ft Perth with S/SE winds in the South West, better and E/SE in Perth and Mandurah ahead of sea breezes.

Saturday will be much cleaner across the South West with an E/SE offshore and easing S/SW swell from 5-6ft, 2ft in Mandurah and 1-2ft Perth.

Sunday looks smaller again, but a small to modrate sized reinforcing S/SW groundswell is due through the day, produced by a less than favourably aligned pre-frontal fetch of strong to gale-force NW winds around the Heard Island region over the coming days.

Sets to 4-6ft should persist across the South West into Sunday afternoon, tiny in Perth and Mandurah, easing Monday. Conditions look great each morning with E/SE offshores, giving into afternoon sea breezes.

Longer term there's nothing too significant on the cards into next week with the Southern Ocean entering a quiet period, but we'll have a closer look at this on Friday.