Surf Forecasts:
Flatrock surf forecast from 23 Aug 2026:
- Best quality surf: Monday 31 Aug, 12AM (local time) - 10ft (3.0m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 28 Aug, 6PM (local time) - 13ft (4.0m), 15s period, WSW swell with 6,846 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 12PM (local time) - 5ft (1.5m), 14s 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 Monday (Aug 24) at 12PM. The primary swell is predicted to be 1.5m and 14s period with a secondary swell of 0.4m and 19s. 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 15s and forecast to arrive on Friday (Aug 28) 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 0.6m 4s period and expected on Sunday (Aug 30) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Mon 24th Aug) | 5ft (1.5m) 14s |
| Best Surf | 12AM (Mon 31st Aug) | 10ft (3.0m) 17s |
| Most Powerful | 6PM (Fri 28th Aug) | 13ft (4.0m) 15s |
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 down the line for Flatrock. We’ve got a solid run of SW groundswell on the way, but the wind is going to be the main character in this story. For a lot of the first week, it’s going to be a battle to find clean conditions, but there are a couple of windows where it all lines up.
The first few days, Monday the 24th through Wednesday the 26th, are a bit of a write-off for a good session. The swell is there, but the wind is messy—cross or cross-on—and the wave energy is moderate (1062). The water temp is about average for the time of year, nothing wild. Thursday the 27th has a bit more size, but the wind is still a factor, so it’s not the one.
The real standout is Saturday morning, August 29th. We’ve got clean offshore wind from the east, a solid 7ft SW swell, and the combined energy is strong (1698). The period is 11 seconds, which is nice groundswell power. This is your session for the week—clean, punchy, and well-shaped. It’s a reef break for advanced surfers, and it can get crowded sometimes, so get out early.
Keep an eye on Monday, August 31st, and Tuesday, September 1st. Both mornings have glassy offshore or light cross-off winds, with 8ft and 7ft SW groundswell respectively. The energy is strong (3761 and 2287). The waves are going to be clean and powerful, but at 8ft, this is expert territory. The period is a long 16 seconds, so the sets will be well-spaced with plenty of grunt—perfect for a reef setup like this.
The following week gets a bit messy again. By the 5th of September, we’re looking at a big, lumpy 10ft to 12ft SW swell, but the wind is onshore or cross, and the combined energy is very strong (up to 5180). That’s a lot of water moving, but the conditions aren’t going to be clean. It’s more of a big-wave grind than a smooth session. By the 8th of September, the swell peaks at 16ft, but that’s too big for this break, with onshore wind making it a no-go.
So, to sum it up: Saturday morning, August 29th, is your best bet for clean, fun surf. Monday the 31st and Tuesday the 1st are also great if you’ve got the experience for the size. Everything else is either wind-affected or too big.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Mon afternoon. Very mild (max 16°C on Sun night, min 11°C on Tue night). Winds decreasing (fresh winds from the S on Mon night, light winds from the WSW by Tue night). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Thu night. Warm (max 21°C on Thu afternoon, min 11°C on Fri night). Winds increasing (light winds from the NE on Wed night, fresh winds from the NNW by Thu night). | ||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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 14 | SW 14 | SW 13 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 15 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | WSW 14 | SW 11 | SW 13 | SW 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 1576 | 1002 | 754 | 1575 | 3729 | 2383 | 1564 | 1242 | 796 | 844 | 862 | 2118 | 4804 | 3438 | 5012 | 5318 | 996 | 545 | 760 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross | cross | cross | on | cross | cross-on | cross-off | cross-off | cross | cross | cross-on | on | cross-on | off | cross-off | cross-off |
High Tide | 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 | 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 | ||||||||
 |  | |  |  |  |  | | | | | | |  | | | | | | |
 | — | 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 | 4 | 5 | 4 | 1 | — | — | — | — | — | — | — | — | 4 | 3 | — | — | — | — | — |
Temp °C | 16 | 12 | 14 | 14 | 13 | 13 | 13 | 12 | 13 | 14 | 17 | 21 | 19 | 14 | 14 | 14 | 14 | 14 | 14 |
Feels °C | 13 | 7 | 9 | 7 | 7 | 9 | 11 | 8 | 9 | 10 | 11 | 17 | 12 | 10 | 9 | 9 | 10 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 14 | SW 13 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 15 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | WSW 14 | SW 11 | SW 10 | SW 13 |
| kJ | 1576 | 1002 | 754 | 1120 | 3729 | 2383 | 1564 | 1242 | 796 | 844 | 862 | 2118 | 4804 | 3438 | 5012 | 5318 | 996 | 499 | 760 |
Swell 2 Height (m) Direction Period (s) | — | SW 20 | SW 18 | SW 16 | — | — | SSW 13 | — | SSW 16 | SSW 23 | SW 21 | SW 14 | — | SSE 11 | S 11 | S 9 | SW 14 | SW 13 | SSW 21 |
| kJ | — | 60 | 159 | 966 | — | — | 189 | — | 175 | 53 | 728 | 1063 | — | 13 | 9 | 7 | 686 | 545 | 297 |
Swell 3 Height (m) Direction Period (s) | — | — | ENE 4 | — | — | — | — | — | — | SW 23 | — | — | — | — | — | — | SW 20 | SSW 23 | — |
| kJ | — | — | 4 | — | — | — | — | — | — | 83 | — | — | — | — | — | — | 16 | 53 | — |
Wind waves Height (m) Direction Period (s) | — | NE 3 | — | SW 13 | SW 16 | — | — | — | — | — | N 4 | NW 6 | — | W 6 | — | SW 14 | — | — | SE 3 |
| kJ | — | 5 | — | 1575 | 3383 | — | — | — | — | — | 41 | 32 | — | 99 | — | 3240 | — | — | 4 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 74 | 42 | 153 | 698 | 198 | 42 | 42 | 42 | 74 | 204 | 44 | 204 | 204 | 153 | 151 | 0 | 152 | 485 |
Best forecast wave conditions in Eyre Peninsula | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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