Surf Forecasts:
Flatrock surf forecast from 26 Aug 2026:
- Best quality surf: Thursday 27 Aug, 9PM (local time) - 8ft (2.5m), 18s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 28 Aug, 12AM (local time) - 10ft (3.0m), 18s period, SW swell with 4,570 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 9PM (local time) - 4.5ft (1.4m), 15s 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 Wednesday (Aug 26) at 9PM. The primary swell is predicted to be 1.4m and 15s period with a secondary swell of 0.1m and 24s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 3.0m 18s and forecast to arrive on Friday (Aug 28) at 12AM. 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+) | 9PM (Wed 26th Aug) | 4.5ft (1.4m) 15s |
| Best Surf | 9PM (Thu 27th Aug) | 8ft (2.5m) 18s |
| Most Powerful | 12AM (Fri 28th Aug) | 10ft (3.0m) 18s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s talk Flatrock. It’s a reef break built for a SW swell, and only the advanced crew should be looking at it. The water temp is 59°, which is pretty normal for this time of year.
The first few days are a lost cause. Wednesday and Thursday this week are junk with messy wind and weak surf. The first real chance comes on Friday the 28th of August. The morning is clean: 8ft SW swell, 16-second period, and a light cross-offshore breeze from the NE. The combined energy is a solid 3354, so there’s plenty of power. This is a top window for the experts – clean and strong. The afternoon glass off is even smoother, but the swell drops to 8ft. Still a beauty.
Saturday the 29th is smaller in the morning at 5ft, but the offshore E wind keeps it tidy. The period drops to 14 seconds, but it’s still a groundswell with moderate energy (1054). A fun morning session.
Sunday the 30th is a strange one. The morning is only 3ft, but the period is a massive 20 seconds – real long-period groundswell. That’s going to wrap around the reef perfectly, and the offshore E wind makes it glassy. The energy reads 1291, surprising for such a small wave. The afternoon jumps to 7ft, still clean, with cross-off wind.
Monday the 31st is a big one: 8ft in the morning, 18-second period, and clean cross-off wind. The energy is huge at 3999. Another top day for the experts. The afternoon stays the same size but gets choppy with cross-on wind.
The first week of September is rough. Tuesday the 1st is a total washout. Wednesday the 2nd has a clean morning with 7ft, but the window is short.
Into the second week, Friday the 5th of September is a no-go: 13ft swell with howling cross-on wind. That’s blown out and way too big for a paddle. This setup is more for kite surfing.
The next standout is Monday the 7th of September. The morning sees 10ft SW swell, 14-second period, and light cross-off wind. The energy is 3431, and it’s clean. A powerful wave for the experienced surfer.
The real gem in the long-range is Tuesday the 8th of September. The morning offers 10ft SW swell, 18-second period, and a clean offshore E wind. The energy is massive at 5366. This is a proper groundswell, very long period, and it’s going to unload perfectly on the reef. The afternoon stays clean but the wind shifts. If it holds, this is the session to wait for.
After that, the 9th and 10th get blown out, with the 10th afternoon showing a ridiculous 18ft swell and strong cross-on wind. That’s a hard pass.
So, the ones to lock in: Friday the 28th of August morning for the first clean big swell, and Tuesday the 8th of September morning for the real deal. Get on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Fri morning, min 12°C on Wed afternoon). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Sat afternoon, min 13°C on Sat night). Winds increasing (light winds from the NE on Sun night, strong winds from the NNW by Tue morning). | |||||||||||||||||||
Wed 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | ||||||||||||||
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 13 | SW 14 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 20 | SSW 18 | SW 17 | SW 16 | SW 18 | SW 16 | SW 16 | SW 15 | SW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 865 | 833 | 992 | 1597 | 4570 | 3345 | 2668 | 1505 | 1033 | 690 | 519 | 664 | 2490 | 3003 | 2413 | 3753 | 2610 | 1983 | 1788 | 2080 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross | cross-on | cross-off | cross-off | on | off | off | cross-off | off | off | off | cross-off | cross-off | cross-on | cross-off | cross | cross-on | cross |
High Tide | 00:40AM0.28m | 12:47PM0.57m | 00:53AM0.33m | 1:06PM0.57m | 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 | |||||||
Low Tide | 7:24PM0.07m | 5:58AM0.06m | 7:28PM0.05m | 6:29AM0.02m | 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 | |||||||
 |  | | | |  | |  | | | | | | | | | | | | | |
 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — |
 | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 13 | 16 | 18 | 19 | 20 | 20 | 18 | 18 | 19 | 16 | 16 | 17 | 15 | 17 | 19 | 19 | 17 | 16 | 13 |
Feels °C | 9 | 9 | 11 | 16 | 16 | 17 | 18 | 14 | 15 | 15 | 13 | 13 | 13 | 10 | 13 | 15 | 15 | 9 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 14 | SW 14 | SW 15 | SW 18 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SSW 18 | SW 17 | SW 16 | SW 18 | SW 16 | SW 16 | SW 15 | SW 16 |
| kJ | 865 | 833 | 992 | 1326 | 4570 | 3345 | 2668 | 1505 | 1033 | 690 | 519 | 627 | 2490 | 3003 | 2413 | 3753 | 2610 | 1983 | 1788 | 2080 |
Swell 2 Height (m) Direction Period (s) | SSW 16 | SSW 23 | SW 21 | SW 19 | — | S 11 | S 10 | SSE 9 | SW 24 | SW 23 | SW 21 | SSW 20 | — | SW 22 | SSW 19 | — | — | — | — | W 6 |
| kJ | 175 | 53 | 508 | 1597 | — | 9 | 9 | 8 | 22 | 130 | 458 | 664 | — | 227 | 1004 | — | — | — | — | 31 |
Swell 3 Height (m) Direction Period (s) | — | SW 23 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 82 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | NNW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 5 | WNW 6 | — |
| kJ | — | — | 16 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 76 | 90 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 42 | 44 | 44 | 42 | 0 | 0 | 152 | 0 | 0 | 74 | 0 | 0 | 0 | 0 | 44 | 151 | 44 | 1339 | 294 | 152 |
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.
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