
Surf Forecasts:
Flatrock surf forecast from 8 Sep 2026:
- Best quality surf: Thursday 10 Sep, 6AM (local time) - 11ft (3.5m), 16s period, SSW swell with offshore winds.
- Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,366 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 6AM (local time) - 11ft (3.5m), 16s 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 Thursday (Sep 10) at 6AM. The primary swell is predicted to be 3.5m and 16s 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 19s and forecast to arrive on Wednesday (Sep 09) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Thursday (Sep 10) at 3PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 10th Sep) | 11ft (3.5m) 16s |
| Best Surf | 6AM (Thu 10th Sep) | 11ft (3.5m) 16s |
| Most Powerful | 9AM (Wed 9th Sep) | 13ft (4.0m) 19s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get into it.
We've got a big, long period SSW groundswell on the way to Flatrock, a reef break that's built for this kind of energy. The water temp is sitting at 60°, which is pretty much what you'd expect for this time of year, no weird anomaly to worry about.
The first real action kicks off the morning of Wednesday the 9th. We're looking at a solid 13ft swell from the SSW, with a very long 19-second period. The wave energy is strong (10366), but the wind is a cross-off from the SE at 25 mph. It's surfable, but that wind is cranking. It's a bit of a battle to get out, but the wave quality is there for the advanced crew.
Thursday the 10th and Friday the 11th are where it really starts to clean up. The swell drops slightly to 12ft on Thursday, but the wind swings to the east at 16 mph, going offshore. That's the ticket. Clean, lined-up walls. By Friday afternoon, the wind drops to a gentle 9 mph offshore, and the swell is a still-punchy 8ft with a 16-second period. That's a standout session for the experienced crowd – the energy is still strong (3062), and the conditions are glassy.
The weekend takes a bit of a turn. Saturday the 12th sees the swell dropping to 6ft, but the wind goes cross and the energy drops. Sunday is a write-off with cross-onshore winds. Monday the 14th is a full-on mess with onshore winds and poor surf.
Now, look ahead. This is the good stuff. The following Tuesday, the 15th, we get a new pulse of 10ft SW swell, and the wind is offshore again. Clean and powerful. The real standout, though, is the morning of Monday the 21st. The forecast is showing a 13ft SSW swell, a 17-second period, and the wind is glassy light from the south at 3 mph. The energy is extreme (8483), and the comment says "exceptional" for experts. That is the morning to circle on your calendar. It's a full two weeks out, so it's a long-range promise, but if it holds, it's going to be a day to remember.
Keep an eye on the 24th as well. The swell is predicted to hit 16ft, which is absolutely massive. The energy reading is through the roof (21528). For a reef break, that's expert territory only, and even then, it might be too big for the spot to hold its shape.
Overall, there's a few days of iffy wind in the middle, but the first week and the second week both have some absolute gems. For the advanced surfer, the Thursday morning the 10th and Friday the 11th are the early standouts. For the true, big-wave, expert level, keep your eyes on Monday the 21st.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Fri afternoon, min 10°C on Wed night). Winds decreasing (strong winds from the SE on Wed morning, light winds from the ENE by Fri morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Sat afternoon, min 10°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
AM | 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) | SSW 19 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 16 | SW 15 | SW 16 | SW 16 | SW 14 | SW 14 | SW 18 | SW 11 | SW 14 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||||
10366 | 8608 | 7109 | 5386 | 4056 | 2661 | 2305 | 3062 | 2856 | 1417 | 1829 | 836 | 1240 | 1068 | 746 | 632 | 1470 | 728 | 3558 | 3013 | 3099 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | cross-off | cross | cross-off | cross-on | cross-on | on | on | cross-on | cross-off | off | cross-off | off |
High Tide | 12:22PM0.55m | 00:39AM0.29m | 12:41PM0.53m | 00:43AM0.36m | 12:56PM0.51m | 00:57AM0.43m | 1:08PM0.47m | 1:15AM0.49m | 1:19PM0.44m | 1:36AM0.53m | 1:28PM0.41m | 1:58AM0.55m | 1:35PM0.38m | 2:21AM0.55m | |||||||
Low Tide | 7:19PM0.07m | 5:58AM0.06m | 7:12PM0.07m | 6:29AM0.03m | 7:09PM0.06m | 6:58AM0.02m | 7:10PM0.04m | 7:25AM0.03m | 7:15PM0.01m | 7:50AM0.05m | 7:25PM-0.02m | 8:13AM0.08m | 7:36PM-0.03m | ||||||||
6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | |
— | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:17 | — | — | 6:19 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 12 | 11 | 12 | 13 | 12 | 16 | 17 | 16 | 19 | 21 | 20 | 18 | 16 | 15 | 15 | 14 | 12 | 13 | 13 | 11 |
Feels °C | 4 | 4 | 4 | 6 | 7 | 7 | 13 | 14 | 12 | 15 | 17 | 15 | 14 | 14 | 12 | 11 | 10 | 7 | 9 | 9 | 7 |
Swell 1 Height (m) Direction Period (s) | SSW 19 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 16 | SW 15 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 11 | SW 14 | SW 14 | SW 14 |
10366 | 8608 | 7109 | 5386 | 4056 | 2661 | 2305 | 3062 | 2856 | 1417 | 1829 | 836 | 1240 | 1068 | 746 | 632 | 1144 | 728 | 3558 | 3013 | 3099 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SW 26 | SSW 24 | — | — | — | SW 18 | — | SW 18 | S 10 | NW 5 | WNW 5 | SW 19 | SW 18 | SW 16 | — | — | — |
— | — | — | — | 26 | 58 | — | — | — | 735 | — | 799 | 8 | 11 | 4 | 179 | 307 | 653 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 12 | S 11 | S 11 | SW 13 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 10 | 9 | 45 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | ESE 4 | — | E 4 | — | E 4 | — | — | — | NW 5 | — | — | — | SW 18 | — | — | — | — |
— | — | — | — | 27 | — | 17 | — | 9 | — | — | — | 17 | — | — | — | 1470 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1352 | 1384 | 152 | 152 | 0 | 0 | 0 | 0 | 74 | 78 | 42 | 44 | 315 | 153 | 42 | 162 | 894 | 74 | 0 | 74 | 0 |
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.










