Surf Forecasts:
Flatrock surf forecast from 28 Aug 2026:
- Best quality surf: Sunday 30 Aug, 9PM (local time) - 7.5ft (2.3m), 17s period, SW swell with offshore winds.
- Most powerful swell: Monday 31 Aug, 9AM (local time) - 8ft (2.5m), 18s period, SW swell with 4,649 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 12AM (local time) - 6ft (1.8m), 14s period with SW swell.
Best Forecast Surf Conditions for Flatrock this week:
The surf forecast for Flatrock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 29) at 12AM. The primary swell is predicted to be 1.8m and 14s period with a secondary swell of 0.2m and 9s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 2.5m 18s and forecast to arrive on Monday (Aug 31) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sat 29th Aug) | 6ft (1.8m) 14s |
| Best Surf | 9PM (Sun 30th Aug) | 7.5ft (2.3m) 17s |
| Most Powerful | 9AM (Mon 31st Aug) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what’s coming our way for Flatrock. It’s a reef setup, strictly for advanced surfers, and we’ve got a real mixed bag of conditions over the next couple of weeks.
We start off with a bang. Friday afternoon, the 28th of August, sees a solid 8ft SW groundswell rumbling in with a very long 16-second period. The energy is pumping (2525), and with light SE cross-offshore winds, it’s going to be clean. The water temperature is right on average for the time of year at 59°F, so nothing unusual there. This is proper, powerful stuff for experienced surfers only – a real standout.
Saturday the 29th keeps the quality high. The morning is your best bet with a clean 5ft SW swell, 14-second period, and beautiful offshore E winds. It’s still a bit heavy, but the conditions are spot on. The afternoon drops off a touch, becoming marginal with a smaller 5ft swell and cross-offshore winds.
Sunday the 30th offers a tale of two sessions. The morning has a long-period, 20-second SSW groundswell at only 3ft, but it’s clean with offshore winds. That long period will make it a bit fat and straight at a beach, but on a reef like Flatrock, it’s got some serious shape. The afternoon brings a much better 7ft SSW swell with the same long 18-second period and clean offshore winds. This is another excellent window, but again, it’s big for a reason.
Then things get interesting. Monday the 31st brings a big 8ft SW swell, and the morning session with NE cross-offshore winds looks absolutely pumping (energy is a massive 7457). The catch? The data flags it as questionable for tide, and this size is firmly in the expert-only zone. A proper heavyweight session if you’re brave enough.
After that, we hit a long dry spell. From Tuesday the 1st of September right through to the 8th, the winds turn ugly. We’re looking at strong onshores, cross-shore gales, and generally blown-out, poor surf. The swell sticks around, often 8ft to 13ft, but with wind from the N, W, and WSW, it’s just a messy, dangerous wall of water. This stretch is a complete write-off for a paddle board; the setup might be more interesting for kite surfing.
The first glimmer of hope comes on Tuesday the 8th of September. The swell drops back to a manageable 7ft, and the wind eases right off to a light SSW cross-onshore. It’s still a bit questionable, but it’s a sign the weather is backing off.
Wednesday the 9th and Thursday the 10th remain marginal, with moderate to light winds and a steady 6ft to 7ft SW swell. Nothing to get too excited about, but the wind is improving.
Finally, we get another potential standout on Friday the 11th of September. A clean 8ft SW groundswell with an 18-second period and gentle N cross-shore winds. The energy is strong (4679), and this is another one for the big-wave crew, but the conditions look a lot more promising than anything we've seen in the past week.
The run continues into Saturday the 12th, but the wind picks up again, getting fresh and lumpy, so that Friday morning is clearly the best option in the second week. It’s still a long way off, so keep an eye on it.
All in all, the first few days are the real prize here. After that, it’s a waiting game for the wind to play nice.
Rusty
Short Range ForecastMostly dry. Warm (max 20°C on Fri afternoon, min 14°C on Sun morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Mon afternoon, min 12°C on Tue night). Winds increasing (calm on Mon afternoon, strong winds from the N by Tue morning). | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | ||||||||||||||||||||
Wave Height (m) Direction Period (s) | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SSW 18 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 |
Wave Graph | ||||||||||||||||||||
2516 | 1402 | 1033 | 690 | 519 | 664 | 2519 | 3003 | 4649 | 4138 | 2761 | 1933 | 1062 | 2453 | 2726 | 2577 | 2544 | 2667 | 2557 | 2448 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | cross-off | off | off | off | off | cross-off | cross-on | cross-off | cross | on | cross-on | on | cross-on | cross-on | cross-on | on | on |
High Tide | 1:11AM0.38m | 1:26PM0.55m | 1:32AM0.43m | 1:44PM0.51m | 1:55AM0.48m | 1:59PM0.46m | 2:20AM0.51m | 2:10PM0.40m | 2:46AM0.52m | 2:12PM0.35m | 3:15AM0.51m | 1:57PM0.31m | ||||||||
Low Tide | 7:35PM0.04m | 6:59AM0.01m | 7:43PM0.03m | 7:29AM0.01m | 7:53PM0.02m | 7:59AM0.02m | 8:02PM0.01m | 8:29AM0.06m | 8:11PM0.00m | 8:59AM0.12m | 8:18PM-0.00m | 9:27AM0.19m | 8:22PM-0.01m | |||||||
— | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | |
6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:09 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 19 | 19 | 17 | 17 | 17 | 14 | 17 | 19 | 18 | 17 | 16 | 13 | 12 | 13 | 14 | 15 | 15 | 14 |
Feels °C | 18 | 15 | 17 | 15 | 14 | 14 | 13 | 10 | 14 | 17 | 15 | 8 | 11 | 8 | 8 | 7 | 8 | 10 | 9 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SSW 18 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 |
2516 | 1402 | 1033 | 690 | 519 | 658 | 2519 | 3003 | 4649 | 4138 | 2761 | 1933 | 1062 | 2453 | 2726 | 2577 | 2544 | 2667 | 2557 | 2448 | |
Swell 2 Height (m) Direction Period (s) | S 10 | SSE 9 | SW 23 | SW 23 | SW 21 | SSW 20 | — | SW 22 | SW 18 | — | — | — | SW 18 | — | — | — | — | — | — | — |
9 | 8 | 21 | 130 | 458 | 664 | — | 372 | 2808 | — | — | — | 628 | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | NNW 5 | NW 6 | — | WSW 6 | W 5 | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | 56 | 118 | — | 47 | 64 | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 74 | 0 | 0 | 0 | 0 | 74 | 89 | 44 | 799 | 221 | 698 | 42 | 162 | 164 | 884 | 1341 | 1215 |
Best forecast wave conditions in Eyre Peninsula | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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Information about the Flatrock Surf forecast
The above surf forecast table for Flatrock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Flatrock can be found by selecting the local surf guide option on the grey menu. Our Flatrock surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Flatrock) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Flatrock may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Are you planning a holiday in Eyre Peninsula? If you are looking for accommodation near Flatrock, camping, hotels and holiday cottages in Eyre Peninsula, consider staying in Port Lincoln which is 49 km (30 miles) away.











