Great run for the South Coast with smaller options on the Mid

Craig Brokensha picture
Craig Brokensha (Craig)

South Australian Surf Forecast by Craig Brokensha (issued Monday September 6th)

Best Days: South Coast tomorrow, Wednesday, Thursday, Friday and Saturday morning, beginners on the Mid tomorrow and early Wednesday, Friday morning on the Mid

Features of the Forecast (tl;dr)

  • Mod-large SW groundswell building tomorrow, peaking in the PM with an additional S/SW groundswell late in the day, but more so Wed, easing throught the day. Light W/NW tending S/SW winds down South, E/SE tending W on the Mid
  • Great N tending N/NW winds with the easing S/SW groundswell Wed (N/NE early on the Mid)
  • Easing S/SW swell Thu with fresh to strong N/NW winds
  • New mix of W/SW and SW swells for Fri with NE tending freshern N/NW winds on the Mid, N/NE tending N/NW down South
  • Easing mix of swells Sat with strengthening W/NW winds
  • Building S/SW groundswell Sun, peaking Mon with strong SW tending S winds, more variable Mon AM


Onshore winds moved in just before dawn on Saturday down South creating poor conditions with a small swell, better on the Mid Coast for the keen with bumpy 1-2ft waves. Sunday was similar on the Mid and the South Coast was a touch better with more size and workable winds for protected spots.

Today winds are lighter but with a drop in W/SW swell energy leaving tiny waves on the Mid Coast, workable for the keen down South.

This week and weekend (Sep 7 - 12)

We've got a great week of surf ahead before things go a little pear shaped into the weekend.

Firstly, there's no change to the SW groundswell that's due to fill in tomorrow, generated by a strong, slow moving polar low that developed around the Heard Island island region last Thursday evening.

The low pushed east while generating slowly weakening winds from the severe-gale range, and there's been no change to the expected size with it due to build through tomorrow, from 3ft across Middleton, to 4-5ft into the afternoon with 1-1.5ft sets on the Mid Coast through the afternoon.

There's been an upgrade in a reinforcing pulse of S/SW groundswell due in the mix late tomorrow but more so Wednesday morning, generated by a deepening, significant low south of us today.

Ahead of the low, pre-frontal severe-gales will be followed by post-front severe-gale to storm-force W/SW-SW winds, and these secondary winds will be the main source of swell for us.

Size wise, Wednesday morning should see strong 4-5ft+ waves across Middleton (5-6ft sets deep water reefs), easing through the day, with the swell not being favourable for the Mid Coast leaving easing 1-1.5ft sets.

Conditions tomorrow will be clean ahead of the bulk of the swell with a light W/NW breeze down South, light E/SE on the Mid, with weak S/SW sea breezes down South, W/NW on the Mid. With winds being light into the afternoon and with the strong new, building swell there'll still be quality options down South.

Wednesday looks the day though with N tending N/NW winds (N/NE in the AM on the Mid), creating excellent conditions all day with the strong S/SW groundswell.

Thursday will also be good but windier with a fresh to strong N/NW breeze and easing sets from 2-3ft across Middleton, tiny on the Mid Coast.

Moving into Friday and a fun, new, mid-period SW swell is due, generated by a strengthening, broad polar frontal progression firing up under the country Wednesday afternoon.

Strong to gale-force W-W/SW winds are forecast and this should produce a moderate sized swell, peaking through Friday. Middleton should see 3ft+ waves, while the Mid Coast will actually see an inconsistent W/SW groundswell filling in at the same time. This is being generated by a strong mid-latitude low that's west-southwest of Western Australia, with a fetch of patchy gale to severe-gales being projected through our medium-long range swell window.

The swell will be inconsistent but 1-2ft sets are likely on the Mid and with favourable (early) light NE tending stronger N/NW winds. The South Coast will be clean all day and great fun again.

Come Saturday the swell will be on the way out and with a strengthening W/NW breeze ahead of a trough which will move through Sunday bringing strong SW tending S winds. This trough will be attached to a stronger polar frontal system, generating a large S/SW groundswell for Sunday/Monday, but we'll have a closer look at this Wednesday.


MMylechreest's picture
MMylechreest's picture
MMylechreest Wednesday, 8 Sep 2021 at 11:46am

The knights webcam is down how long till she’s back up & online?

Craig's picture
Craig's picture
Craig Wednesday, 8 Sep 2021 at 12:05pm

Back now, we had a streaming issue. Enjoy.