Margaret River Mouth Surf Forecast and Surf Report

G’day, Rusty here. Look, I’ve been staring at the charts for Margaret River Mouth, and honestly, the next sixteen days are a mixed bag. We’ve got a solid run of groundswell coming in, but the wind is going to mess with us more than a few times. The river mouth is a sheltered setup, so it’s always worth a look, but we’ve got to pick the windows right.

The water temp is sitting pretty average for this time of year, nothing weird going on there.

Alright, rolling into it. The first real fun kicks off this Saturday, August 29. Saturday morning, we’ve got a clean 4ft SSW groundswell with a super long 16-second period, and a light offshore breeze from the ESE at 12 mph. The combined energy is moderate at 917, and it’s going to be glassy and clean. That’s a proper beginner-friendly wave for the morning. Saturday afternoon gets even better as the swell bumps up to 5ft from the same SSW direction, period stretches to 17 seconds, and the wind drops to a light offshore at 6 mph. The energy jumps to 1432, and conditions are clean. This is a sweet spot for the weekend.

Sunday morning the 30th still holds with 6ft from the WSW, 17-second period, and a light cross-offshore breeze. The energy is strong at 1644, and the surf is clean. But Sunday afternoon, the wind swings cross-onshore and it gets a bit choppy, so morning sessions are the go.

Monday the 31st is a write-off with onshore wind and poor conditions. That lumpy, messy stuff lasts right through to Wednesday the 2nd of September. There’s a rough patch of onshore winds and rain, with waves around 5ft to 6ft but blown out. Not worth paddling out.

We get a slight reprieve on Thursday, September 3. Morning shows 6ft SW groundswell at 14 seconds with a light cross-onshore breeze. The energy is moderate (1150) and it’s only got small wind ripples. It’s marginal but a lot better than the days before. Afternoon is similar, 5ft and light onshore wind, still okay for a patient surfer.

Friday the 4th is a complete no-go. Strong to gale-force winds and rain squalls, 5ft to 6ft but completely messy. Saturday the 5th isn’t much better, with 7ft to 7ft WSW swell and moderate cross-shore winds creating a cross-chop. It’s powerful (energy around 1612) but ugly. That’s more of a kite-surfing setup than a paddle session.

Sunday the 6th settles a bit with 5ft to 6ft from the WSW and a cross-offshore breeze, keeping things clean. It’s marginal but rideable, especially in the afternoon when the energy is stronger (1313).

Now, here’s the real standout. Monday, September 7 morning. The wind goes absolutely glassy—dead calm. Swell is 4ft from the SW with a 13-second period, and the energy is moderate (896). It’s going to be smooth as butter. A true gem for a quiet Monday session. Tuesday the 8th morning is also clean with a light offshore from the east, 4ft SW swell and a long 16-second period. Nice and clean.

But the absolute best of the whole run is Thursday, September 10 afternoon. We’ve got 7ft of SW groundswell with a 17-second period, and the wind goes glassy again. The combined energy is massive at 2559. This is big, powerful, clean swell. Now, 7ft is getting up there—this is for experienced surfers only. That’s the one to circle on your calendar.

The week after that is a bit of a letdown. Friday the 11th has 7ft waves but with a cross-shore breeze chopping it up. Saturday and Sunday the 12th and 13th fade, with the wind turning onshore and the swell dropping. Sunday the 13th is back to 5ft onshore slop. There’s a gap of a few days with no recommendations.

So, to sum it up: this weekend (Sat 29 and Sun 30) mornings are solid, but the absolute best is Thursday, September 10 afternoon—7ft glassy groundswell for the experienced crew. Monday the 7th morning is the hidden gem for a peaceful, clean session.

Rusty.

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