Surf Forecasts:
Flatrock surf forecast from 23 Aug 2026:
- Best quality surf: Thursday 27 Aug, 6PM (local time) - 10ft (3.0m), 18s period, SW swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 9PM (local time) - 10ft (3.0m), 18s period, SW swell with 5,430 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 6PM (local time) - 7ft (2.2m), 16s 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 Sunday (Aug 23) at 6PM. The primary swell is predicted to be 2.2m and 16s period. 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 Thursday (Aug 27) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Monday (Aug 24) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sun 23rd Aug) | 7ft (2.2m) 16s |
| Best Surf | 6PM (Thu 27th Aug) | 10ft (3.0m) 18s |
| Most Powerful | 9PM (Thu 27th Aug) | 10ft (3.0m) 18s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, this is Rusty comin' at ya from Flatrock. Let's have a look at what the next couple of weeks have in store for this exposed reef break.
We've got a bit of a wait on our hands. The first good surf window isn't until the morning of Sunday the 23rd. From there, it's a bit of a mixed bag, with some proper standouts and some real duds to sit out.
The standout session for the whole period is looking like Sunday the 30th of August. We've got a solid 8ft groundswell from the SSW, with a very long period of 16 seconds, and it's glassing up with a light offshore breeze out of the east. The water's sittin' at a pretty average 59°F, nothing unusual there for this time of year. The combined energy is a meaty 3552, so there's plenty of grunt. This is an advanced spot for a reason, and with that much power, it'll be a proper handful. Only for the experienced crew.
Another one to circle on the calendar is Sunday the 6th of September. The morning session is looking unreal – a 10ft SW groundswell, a very long 16-second period, and glassy conditions with a slight air from the NNE. The combined energy is massive at 4414. Again, this is expert territory with that size and power, but the conditions will be absolutely pristine.
Now, don't get too excited about the week in between. There are some sessions with good swell, like the 8ft on Friday the 28th, but the wind is often onshore or cross-onshore, putting a chop on the face. The Tuesday the 25th has a big 10ft swell, but a 19 mph cross-shore wind is going to make it lumpy and ugly.
Towards the very end, the 7th of September gets messy with strong onshore winds, so we'll give that a miss.
So, to boil it down: the absolute best bet for clean, powerful surf is the morning of Sunday the 30th of August. The morning of Sunday the 6th of September is a close second, but it's further out, so keep an eye on the forecasts. There's good swell running through the period, but you have to pick your windows carefully to avoid the chop. Expect some crowds at this spot, as it's a known quantity when it's good.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Sun night. Very mild (max 17°C on Sun afternoon, min 11°C on Tue night). Winds decreasing (fresh winds from the SSW on Mon night, calm by Tue night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Fri morning, min 10°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 15 | SW 21 | SW 19 | SW 18 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3721 | 2726 | 1576 | 902 | 671 | 1783 | 3729 | 2541 | 1587 | 1144 | 784 | 844 | 1063 | 2848 | 5308 | 3263 | 2829 | 1624 | 975 | 821 | 578 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | off | cross-off | glassy | cross | cross | cross-on | glassy | cross | cross-on | cross-off | cross | cross-on | cross-off | cross | on | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 1:06PM0.57m | 1:11AM0.38m | 1:26PM0.55m | 1:32AM0.43m | ||||||||
Low Tide | 8:21PM0.08m | 7:44PM0.09m | 4:42AM0.16m | 7:27PM0.08m | 5:25AM0.10m | 7:24PM0.07m | 5:58AM0.06m | 7:28PM0.05m | 6:29AM0.02m | 7:35PM0.04m | 6:59AM0.01m | 7:43PM0.03m | |||||||||
 |  |  |  | |  | |  |  | | | | | |  | | | | | | | |
 | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — |
 | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — |
mm | — | — | 5 | 4 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 16 | 13 | 14 | 14 | 13 | 12 | 12 | 11 | 13 | 14 | 16 | 18 | 18 | 19 | 19 | 17 | 16 | 16 | 13 |
Feels °C | 12 | 15 | 13 | 11 | 10 | 9 | 7 | 7 | 10 | 7 | 11 | 9 | 11 | 15 | 15 | 15 | 16 | 14 | 13 | 12 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 15 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 12 |
| kJ | 3721 | 2726 | 1576 | 902 | 671 | 774 | 3729 | 2541 | 1587 | 1144 | 784 | 844 | 1063 | 2848 | 5308 | 3263 | 2829 | 1624 | 975 | 821 | 555 |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 20 | SW 18 | — | — | — | SSW 13 | SSW 12 | SW 16 | SW 23 | SW 21 | SW 14 | — | — | S 11 | S 9 | — | SSW 23 | SSW 18 |
| kJ | — | — | — | 60 | 159 | — | — | — | 149 | 79 | 211 | 85 | 940 | 1220 | — | — | 9 | 7 | — | 50 | 578 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | NW 5 | — | — | — | — | — | — | SW 23 | — | — | — | — | — | — | — | SW 19 | — |
| kJ | — | — | — | — | 6 | — | — | — | — | — | — | 84 | — | — | — | — | — | — | — | 15 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 4 | — | SW 13 | SW 16 | — | — | — | — | — | N 4 | — | — | — | NW 5 | — | — | — | S 4 |
| kJ | — | — | — | 12 | — | 1783 | 3383 | — | — | — | — | — | 10 | — | — | — | 18 | — | — | — | 19 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 154 | 42 | 0 | 89 | 0 | 153 | 632 | 198 | 0 | 42 | 42 | 0 | 44 | 42 | 0 | 74 | 151 | 0 | 0 | 162 | 0 |
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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