Surf Forecasts:
Flatrock surf forecast from 21 Aug 2026:
- Best quality surf: Thursday 27 Aug, 6PM (local time) - 13ft (4.0m), 17s period, WSW swell with onshore winds.
- Most powerful swell: Thursday 27 Aug, 6PM (local time) - 13ft (4.0m), 17s period, WSW swell with 9,736 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 8ft (2.5m), 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 Saturday (Aug 22) at 9PM. The primary swell is predicted to be 2.5m and 15s period with a secondary swell of 1.4m and 19s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 4.0m 17s and forecast to arrive on Thursday (Aug 27) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Tuesday (Aug 25) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 22nd Aug) | 8ft (2.5m) 15s |
| Best Surf | 6PM (Thu 27th Aug) | 13ft (4.0m) 17s |
| Most Powerful | 6PM (Thu 27th Aug) | 13ft (4.0m) 17s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
G'day, Rusty here. Alright, let’s get into it for the Flatrock region. We’ve got a classic late-winter run of solid SW groundswells coming through, but the wind is going to be the major player here. It’s a reef break that loves a proper SW swell, which we’re getting in spades, but for the most part, the wind is going to be fighting us, making it a real game of picking the right sessions.
The first real window to look at is Sunday, August 23rd. We’ll have a 8ft SW groundswell rolling in with a long 16-second period, and the wind swings around to a clean, cross-offshore from the NNE at 12 mph. The wave energy is in the moderate-to-strong range (3721). That’s going to make for some well-shaped, powerful lines at Flatrock. It’s an advanced wave to start with, so that size and power is for experienced crew only.
Now, for the standout. Keep your eyes locked on Sunday, August 30th afternoon. The wind eases back to a moderate breeze, and we get a clean, cross-offshore flow from the SSE at 16 mph. The swell jumps right up to a chunky 12ft from the SSW with a very long 19-second period, and the combined energy is massive at 8755. This is proper, heavy groundswell. For a reef break like Flatrock, that long period will unload some beautiful, deep barrels for the experts. It’s going to be a big, raw, and incredibly powerful session, but it’s only for the very best. Expect crowds to be a problem here, as it’s a spot that draws a crew when it’s on.
There’s a promising run towards the end of the window, too. Friday, September 4th morning is looking glassy. We have zero wind and a solid 8ft SW swell with a moderate 14-second period and 2670 combined energy. The conditions are described as "excellent." That kind of glassy, clean, overhead reef surf is about as good as it gets. It should be a proper session.
The first week is full of lumpy, cross-onshore winds that will make the big swells messy and challenging. A lot of those days are best left to the kite crew. There’s a long gap of poor conditions from the 23rd to the 30th, with only that Sunday morning session offering a real clean chance before the big one on the 30th.
Keep in mind, the water temp is about average for this time of year.
Stay stoked, check the charts, and I’ll see you out there.
Rusty
Short Range ForecastHeavy rain (total 29mm), heaviest during Mon morning. Very mild (max 17°C on Sun afternoon, min 11°C on Mon morning). Winds increasing (calm on Sat night, fresh winds from the ENE by Mon morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Mon night. Very mild (max 17°C on Thu morning, min 11°C on Tue night). Winds decreasing (fresh winds from the SSW on Mon night, calm by Tue night). | ||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 13 | SSW 16 | SSW 14 | SW 14 | SW 13 | SW 12 | SW 15 | SW 20 | SW 19 | SW 17 |
Wave Graph  | |||||||||||||||||||
 kJ | 4084 | 3330 | 2919 | 2383 | 3721 | 2726 | 1446 | 1002 | 671 | 784 | 4056 | 3338 | 2618 | 1067 | 748 | 1011 | 2047 | 7523 | 8543 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | cross-off | cross-off | cross-on | cross-off | off | off | cross | cross | cross-on | cross-on | cross | cross-on | cross-off | cross | cross-on | cross |
High Tide | 5:45AM0.35m | 11:40AM0.42m | 11:50AM0.47m | 1:03AM0.20m | 12:07PM0.52m | 00:38AM0.23m | 12:27PM0.55m | 00:40AM0.28m | 12:47PM0.57m | 00:53AM0.33m | |||||||||
Low Tide | 8:29AM0.35m | 8:57PM0.06m | 8:21PM0.08m | 7:44PM0.09m | 4:42AM0.16m | 7:27PM0.08m | 5:25AM0.10m | 7:24PM0.07m | 5:58AM0.06m | 7:28PM0.05m | |||||||||
 |  | | |  | |  |  | |  | | |  | | | | | | | |
 | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — |
 | 6:00 | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:05 | — | — | 6:05 | — |
mm | — | — | — | — | — | — | 2 | 16 | 11 | 1 | — | — | — | — | — | — | — | — | 6 |
Temp °C | 15 | 13 | 13 | 13 | 15 | 17 | 16 | 12 | 12 | 14 | 14 | 13 | 13 | 12 | 13 | 13 | 17 | 16 | 13 |
Feels °C | 11 | 11 | 11 | 12 | 12 | 15 | 12 | 6 | 6 | 9 | 7 | 7 | 10 | 8 | 9 | 10 | 11 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 13 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 15 | SW 14 | SW 19 | SW 17 |
| kJ | 4084 | 3330 | 2919 | 2383 | 3721 | 2726 | 1446 | 1002 | 671 | 784 | 3911 | 2763 | 2618 | 1067 | 748 | 1011 | 1077 | 7523 | 8543 |
Swell 2 Height (m) Direction Period (s) | S 26 | SW 23 | SW 21 | SW 19 | — | — | — | SW 20 | SW 18 | SW 17 | — | — | SSW 13 | SW 18 | SW 16 | SSW 24 | SW 20 | — | S 12 |
| kJ | 13 | 140 | 664 | 1696 | — | — | — | 60 | 159 | 553 | — | — | 131 | 154 | 310 | 55 | 2047 | — | 11 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | N 5 | — | — | WSW 20 | SW 18 | SSW 10 | SW 23 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 4 | — | — | 37 | 111 | 139 | 86 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NE 4 | ESE 5 | SSW 16 | SSW 14 | SW 14 | — | — | — | NNW 5 | WNW 6 | SW 17 |
| kJ | — | — | — | — | — | — | — | — | 15 | 49 | 4056 | 3338 | 1886 | — | — | — | 50 | 223 | 5876 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 316 | 74 | 153 | 0 | 151 | 42 | 0 | 0 | 74 | 153 | 782 | 830 | 153 | 42 | 42 | 44 | 204 | 151 | 315 |
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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