Western Australia Surf Forecast by Craig Brokensha (issued Monday 8th July)

Best Days: Perth and Mandurah every day, Margs Friday, Saturday, Sunday morning, selected spots Monday morning

Recap

Large, poor and onshore easing waves across the South West Saturday, lumpier and smaller Sunday for keen surfers. Mandurah and Perth were better Saturday morning and to a clean 3ft on the former, lumpy and 2-3ft in the later, with a reversal of conditions yesterday, cleanest in Perth.

Today onshore winds were into the South West with cleaner small fun 2ft waves to the north. This afternoon we should see a new large and long-period W/SW groundswell building, and looking at the cams and buoys, it's filling in.

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This week and weekend (Jul 9 – 14)

This afternoon's increase in large W/SW groundswell should reach 10-12ft across the South West by dark, 3-4ft in Mandurah and 3ft in Perth, easing back from a similar size tomorrow morning.

Conditions will be best across Mandurah and Perth with winds now due to be onshore out of the W/SW in Margaret River which is a real shame. To the north light E/NE breezes are expected, variable ahead of late sea breezes, more so Mandurah.

Wednesday looks dicey across all locations as the large swell continues to ease along with SW breezes in the South West and variable winds in Perth and Mandurah with easing 2ft and 2-3ft waves respectively.

Our new long-range and inconsistent W/SW groundswell for Thursday is still on track, with a strong low forming south-east of South Africa generating a fetch of severe-gale to storm-force W'ly winds. The storm has since weakened and we should see Margs offering inconsistent 6-8ft+ waves when it peaks, 2-3ft in Mandurah and 2ft+ in Perth.

Winds look to still be onshore across the South West on Thursday which is frustrating, out of the W/SW, with offshore E/NE winds to the north. Friday looks to finally swing offshore with a light E/NE breeze (variable afternoon) and easing sets slowly from 6-8ft.

The weekend will be fun as the swell continues to slowly back off Saturday with an E/NE offshore breeze (variable afternoon), while a new fun W/SW groundswell is due to move in on Sunday. This swell will be the first and smallest of a progression of long-period W/SW groundswells due into next week, generated by strong lows forming south-east of South Africa, under the influence of the Long Wave Trough.

The first low will be tight and small, with a pulse to 6ft+ due across the South West Sunday afternoon, 2ft to maybe 3ft in Mandurah and 2ft in Perth. Winds look to take a NE-N/NE bias on Sunday limiting surfing options, even less favourable and fresher Monday.

These N'ly winds look to persist through Tuesday and shift NW on Wednesday/Thursday as some larger long-period W/SW groundswell fills in. A very strong low forming south-east of South Africa behind Sunday's swell generator will produce a fetch of severe-gale to storm-force W/SW winds, projecting north of our swell window and weakening in the southern Indian Ocean.

A large long-period and inconsistent W/SW groundswell is due off this source, filling in Tuesday and building to 8ft to maybe 10ft later in the day in the South West, 3ft in Mandurah and 2-3ft in Perth. Winds will be N/NW though, cleaner in Perth and Mandurah.

Another large swell is on the cards for later week, but we'll have a closer look at this on Wednesday.