
Surf Forecasts:
Flatrock surf forecast from 7 Sep 2026:
- Best quality surf: Thursday 10 Sep, 3AM (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 10,738 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 12AM (local time) - 8ft (2.5m), 18s 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 Tuesday (Sep 08) at 12AM. The primary swell is predicted to be 2.5m and 18s period with a secondary swell of 2.0m and 13s. 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 1.0m 5s period and expected on Friday (Sep 11) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 8th Sep) | 8ft (2.5m) 18s |
| Best Surf | 3AM (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 folks, Rusty here. Let’s have a look at what’s coming our way.
We’ve got a solid run of surf ahead, but it’s not all clean and easy. The first few days are a bit of a mixed bag with some serious size and wind to deal with, but the real standout sessions are waiting for those who are patient and know what they’re doing.
Monday 7th September kicks things off with a building SW swell coming in around 5ft to 6ft. The energy is moderate (1082) and there’s a cross-off wind, but the report says it’s marginal. It’s a bit of a warm-up, not the best. The water temp is 60°, which is about average for this time of year.
Then Tuesday 8th September is where it gets interesting. The morning brings a solid 8ft SW swell with a very long period of 17 seconds. The energy jumps right up to strong (4043). The wind is light and cross-off, making it clean. This is a serious session for experienced surfers only – that size is too much for beginners. The long period means the waves will have real power and shape, but it’s a reef break, so that’s where it shines.
Wednesday 9th September sees the swell crank up to a massive 13ft, with energy soaring into the very strong range (10738). The wind is strong from the SE, but it’s cross-off, so the waves will be clean. This is big, powerful, and not for the faint of heart. Only for experts, and even then, you need to be on your game.
The highlight of the first week is Thursday 10th September. The morning has a 12ft SSW swell, energy is still very strong (5319), and we get offshore E winds at 25 km/h. That’s the magic combination – clean, offshore conditions on a big, powerful swell. This is exceptional for experts. The afternoon drops slightly to 10ft but stays offshore clean.
Friday 11th September offers a bit of a breather with a 7ft to 8ft swell, and the afternoon is a hidden gem. Light SSE winds at just 5 km/h make for glassy, clean conditions. The energy is still strong (3158), so the waves will have punch. Excellent for experienced surfers.
The weekend takes a turn for the worse. Saturday 12th and Sunday 13th September see the swell drop and the wind swing onshore or cross, making for choppy, poor conditions. Not worth paddling out.
Monday 14th September is a write-off with onshore wind and dropping swell.
Things start to look up again on Tuesday 15th September with a clean 7ft SW swell and offshore E winds. The energy is moderate (1684). This is a solid, fun day for experienced surfers.
Wednesday 16th September brings back the size with a 10ft SW swell and offshore ESE winds. Very strong energy (3417). Another one for the experts on a clean, powerful wave.
After that, the wind gets messy again until we hit the real standout period at the end of the run.
Sunday 20th September is a beauty. The afternoon goes flat calm, glassy, with a 8ft SW swell. The energy is strong (2949). Absolutely clean conditions. This is a top pick for experienced surfers.
But the best of the entire forecast, the one to circle on the calendar, is Monday 21st September. The morning already has a huge 13ft SW swell with massive energy (14216). The wind is strong cross-off. The afternoon, however, is where it gets wild. The swell hits 15ft, the energy is off the charts at 16168, but the wind is a fresh cross-onshore. The report says the swell is too big for this break. That’s a monster, and it’s only for the bravest and most skilled. The true standout, though, is Tuesday 22nd September. The morning has a 12ft SW swell, very long period of 17 seconds, and near-calm NNE winds. The energy is very strong (7367). The afternoon is glassy with the same swell. The reports call this exceptional for experts. This is your target. The water will be clean, the waves will have immense power and shape, and if you can handle it, you’ll score the session of the month.
So, to sum it up: the big, clean, offshore days are for experts. The standouts are Thursday 10th September for the offshore wind on a big swell, and Tuesday 22nd September for the glassy, long-period perfection. The rest of the time is either too big, too windy, or too small. Get out there if you’ve got the skills.
- Rusty
Short Range ForecastMostly dry. Very mild (max 13°C on Mon morning, min 10°C on Mon night). Winds increasing (light winds from the E on Mon night, strong winds from the SE by Tue night). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Sat afternoon, min 10°C on Thu morning). Winds increasing (calm on Fri morning, fresh winds from the N by Sat night). | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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) | SW 13 | SSW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 19 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 15 | SW 18 | SW 16 | SW 16 | SW 15 |
Wave Graph | |||||||||||||||||||||
841 | 990 | 4104 | 4043 | 3543 | 5720 | 10738 | 9006 | 7304 | 5319 | 4056 | 2625 | 2015 | 2697 | 2290 | 1118 | 1331 | 1761 | 1256 | 1082 | 767 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | cross | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-off | cross | cross-on | cross-on |
High Tide | 11:40AM0.50m | 1:53AM0.20m | 12:02PM0.53m | 00:52AM0.23m | 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 | |||||||
Low Tide | 7:45PM0.03m | 4:35AM0.18m | 7:30PM0.05m | 5:23AM0.12m | 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 | ||||||||
6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | |
— | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 12 | 12 | 12 | 13 | 12 | 12 | 11 | 12 | 13 | 12 | 15 | 16 | 16 | 19 | 21 | 21 | 22 | 21 | 18 |
Feels °C | 9 | 8 | 9 | 8 | 7 | 5 | 3 | 4 | 4 | 7 | 8 | 7 | 15 | 15 | 12 | 15 | 17 | 14 | 14 | 15 | 16 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SSW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 19 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 15 | SW 18 | SW 16 | SW 16 | SW 15 |
841 | 990 | 4104 | 4043 | 3543 | 5720 | 10738 | 9006 | 7304 | 5319 | 4056 | 2625 | 2015 | 2697 | 2290 | 1118 | 1331 | 1761 | 1256 | 1082 | 767 | |
Swell 2 Height (m) Direction Period (s) | SW 21 | SSW 20 | SW 13 | — | — | — | — | — | — | — | SW 26 | SSW 24 | — | S 12 | — | SW 18 | S 10 | SW 18 | S 10 | — | W 7 |
224 | 705 | 1286 | — | — | — | — | — | — | — | 26 | 58 | — | 461 | — | 642 | 49 | 546 | 8 | — | 43 | |
Swell 3 Height (m) Direction Period (s) | S 10 | S 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | S 11 | — | SSE 8 | — | — | — |
17 | 40 | — | — | — | — | — | — | — | — | — | — | — | — | — | 110 | — | 23 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SSW 16 | — | — | — | E 4 | E 4 | E 5 | E 5 | — | — | N 4 | NNW 4 | NNW 5 | NNW 5 | WNW 6 | — |
— | — | — | — | — | 4789 | — | — | — | 19 | 20 | 43 | 11 | — | — | 15 | 12 | 17 | 64 | 149 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 126 | 152 | 0 | 0 | 198 | 153 | 1373 | 1703 | 152 | 0 | 0 | 0 | 74 | 0 | 74 | 44 | 42 | 44 | 204 | 156 | 42 |
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.










