
Surf Forecasts:
Flatrock surf forecast from 13 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 9AM (local time) - 10ft (3.0m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Sunday 20 Sep, 6PM (local time) - 13ft (4.0m), 13s period, SW swell with 5,432 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 9AM (local time) - 10ft (3.0m), 15s period with SSW 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 (Sep 16) at 9AM. The primary swell is predicted to be 3.0m and 15s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 4.0m 13s and forecast to arrive on Sunday (Sep 20) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Saturday (Sep 19) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Best Surf | 9AM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Most Powerful | 6PM (Sun 20th Sep) | 13ft (4.0m) 13s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, let's break down what Flatrock has in store for us. The next couple of weeks are a proper mixed bag, with some real quality on the horizon if you're willing to wait and pick your moments. There's a bit of a slow start, but the swell machine gets fired up eventually.
The early part of the run is pretty average. Sunday afternoon kicks things off with a clean 5ft SW groundswell, but a stiff 19 mph onshore west wind makes it a write-off. The water temp is sitting at 60°, which is pretty much what you'd expect for this time of year, nothing weird there.
Monday stays marginal with onshore WSW winds and a building 6ft SW swell, but the conditions just aren't there. Then Tuesday sees the size jump to 10ft from the SW, with a long 15-second period and a cross-offshore wind from the SSE. That's a lot of water moving, and while the wind is clean, this is getting into the "experts only" zone for sure. The wave energy is very strong (3665).
Now, Wednesday the 16th is where it starts to get interesting. The morning session at Flatrock is the first real standout. You've got a solid 10ft SSW groundswell with a very long 15-second period, and a clean offshore breeze from the ESE at 16 mph. The combined energy is pumping at (4257). This is a proper, powerful reef break swell, but the period is so long it might wall up and race. For the crew that knows this place, this is the call. It's a heavy wave, though – this is advanced territory, and crowds are sometimes a thing here.
The rest of that week is a bit of a rollercoaster. Thursday morning drops to 7ft but stays clean with a cross-offshore wind, still good for experienced surfers. But then things get messy again through the weekend with strong winds and lumpy seas, even as the swell size fluctuates.
Looking further ahead, Monday the 28th morning shapes up as another serious highlight, if you can wait that long. We're looking at a huge 13ft SSW swell with a 16-second period. The real kicker is a gentle offshore breeze from the ENE. The numbers on the combined energy are massive (7339). This is big, powerful, and clean. But at 13ft, this is strictly for the top-tier crew at Flatrock. It's a promising call, but it's a long way out, so keep an eye on it.
All up, there are two proper windows: the morning of the 16th, and then the morning of the 28th. The rest is a lot of wind-affected or just plain blown-out surf. There are big gaps of nothing between those standout sessions.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Mon afternoon, min 9°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sat afternoon, min 9°C on Wed night). Winds increasing (light winds from the NNW on Fri afternoon, fresh winds from the N by Sat morning). | ||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 15 | SW 13 | SW 12 | SW 16 | SW 15 | SW 14 | SW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 18 | SSW 16 | SW 14 | SW 13 | W 8 | SW 12 |
Wave Graph | |||||||||||||||||||
757 | 1021 | 736 | 3211 | 3918 | 3710 | 3873 | 4201 | 4222 | 3241 | 1906 | 1222 | 722 | 1415 | 843 | 412 | 261 | 350 | 1655 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | on | cross-off | cross | cross-on | cross-off | cross | cross-on | on |
High Tide | 1:36AM0.53m | 1:28PM0.41m | 1:58AM0.55m | 1:35PM0.38m | 2:21AM0.55m | 1:40PM0.36m | 2:44AM0.52m | 1:41PM0.34m | 3:08AM0.48m | 1:32PM0.33m | 3:32AM0.43m | 1:00PM0.33m | |||||||
Low Tide | 7:50AM0.05m | 7:25PM-0.02m | 8:13AM0.08m | 7:36PM-0.03m | 8:33AM0.13m | 7:49PM-0.03m | 8:52AM0.17m | 8:02PM-0.02m | 9:06AM0.22m | 8:11PM0.00m | 9:08AM0.28m | 8:12PM0.03m | |||||||
— | 6:30 | — | — | 6:28 | — | — | 6:28 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | |
6:16 | — | 6:17 | — | — | 6:19 | — | — | 6:20 | — | — | 6:20 | — | — | 6:21 | — | — | 6:22 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 13 | 15 | 15 | 12 | 12 | 10 | 12 | 12 | 11 | 13 | 14 | 15 | 18 | 20 | 21 | 23 | 26 | 25 |
Feels °C | 11 | 10 | 11 | 11 | 6 | 5 | 4 | 7 | 7 | 7 | 10 | 12 | 12 | 11 | 17 | 16 | 16 | 19 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 13 | SW 12 | SW 16 | SW 15 | SW 14 | SW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 18 | SSW 16 | SW 14 | SW 13 | SW 13 | SW 16 |
757 | 1021 | 736 | 3211 | 3918 | 3710 | 3873 | 4201 | 4222 | 3241 | 1906 | 1222 | 722 | 1415 | 843 | 412 | 261 | 208 | 581 | |
Swell 2 Height (m) Direction Period (s) | S 11 | SW 19 | SW 18 | — | — | — | — | — | — | — | — | — | SSW 16 | SSW 18 | — | WNW 6 | SW 19 | SW 18 | — |
21 | 177 | 375 | — | — | — | — | — | — | — | — | — | 458 | 547 | — | 23 | 95 | 258 | — | |
Swell 3 Height (m) Direction Period (s) | — | S 11 | SW 18 | — | — | — | — | — | — | — | — | — | SSW 20 | — | — | — | S 10 | E 6 | — |
— | 20 | 442 | — | — | — | — | — | — | — | — | — | 261 | — | — | — | 2 | 1 | — | |
Wind waves Height (m) Direction Period (s) | WSW 6 | — | — | SW 16 | — | — | — | — | — | — | — | — | — | NNW 4 | NW 5 | NNW 3 | NW 6 | W 8 | SW 12 |
85 | — | — | 1953 | — | — | — | — | — | — | — | — | — | 29 | 22 | 11 | 237 | 350 | 1655 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 224 | 360 | 315 | 153 | 153 | 153 | 153 | 0 | 152 | 0 | 74 | 151 | 74 | 294 | 42 | 44 | 204 | 78 | 317 |
Best forecast wave conditions in Eyre Peninsula | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










