Surf Forecasts:
Flatrock surf forecast from 20 Aug 2026:
- Best quality surf: Sunday 23 Aug, 6AM (local time) - 10ft (3.0m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 3PM (local time) - 10ft (3.0m), 19s period, SW swell with 6,300 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 8ft (2.4m), 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 2.4m 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 3.0m 19s and forecast to arrive on Thursday (Aug 27) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Aug 27) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 22nd Aug) | 8ft (2.4m) 15s |
| Best Surf | 6AM (Sun 23rd Aug) | 10ft (3.0m) 17s |
| Most Powerful | 3PM (Thu 27th Aug) | 10ft (3.0m) 19s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's look at what's coming up for Flatrock, a reef break that's fairly consistent. The water temp is about average for this time of year, nothing unusual there.
We've got a solid run of swell on the cards, but it's not all smooth sailing. The first few days are a bit of a write-off with messy cross-onshore winds and questionable conditions, so don't bother paddling out until later in the week. Things start to look up on Sunday the 23rd. The morning is clean with a NNE cross-offshore breeze and an 8.2ft SW groundswell running at 16 seconds. That's a long period, which means the reef here will be handling it well, shaping up some nice lines. The combined energy is strong (3721), so there's plenty of power.
The real standout, though, is without a doubt Friday the 28th of August. The morning session is an absolute gem. We've got a 10.0ft SW swell with a 16-second period, and a clean, gentle offshore from the ESE. That's a recipe for perfection at this spot. The combined energy is pumping (5022), and while it's big, it's a top-tier window for those with the skills. It's the best the forecast has to offer, hands down.
After that, the swell sticks around but the winds get tricky again. There's a notable pulse on Tuesday the 1st of September with an 8.2ft SW swell and 17-second period, but the cross-onshore winds will keep it from being pristine. Then another big one rolls in on Friday the 4th of September with an 11.5ft SW swell and 18-second period. It's a powerhouse (7026), but the cross-shore wind will put a chop on it. That one's for the experts only.
Short Range ForecastMostly dry. Very mild (max 15°C on Fri night, min 12°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Mon morning. Very mild (max 15°C on Sun night, min 11°C on Tue night). Winds decreasing (fresh winds from the S on Mon night, calm by Tue night). | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 3402 | 2668 | 3865 | 4084 | 3330 | 2880 | 2449 | 3721 | 2726 | 1446 | 902 | 661 | 4066 | 6288 | 3713 | 2557 | 1430 | 864 | 1248 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | cross-on | cross-on | cross-off | cross-off | cross-on | cross-off | cross-on | cross-off | cross | cross | cross | cross | cross-on | cross-on | cross |
High Tide | 4:32AM0.40m | 1:32PM0.34m | 5:45AM0.35m | 11:40AM0.42m | 11:50AM0.47m | 1:03AM0.20m | 12:07PM0.52m | 00:38AM0.23m | 12:27PM0.55m | 00:40AM0.28m | |||||||||
Low Tide | 9:44AM0.30m | 9:08PM0.04m | 8:29AM0.35m | 8:57PM0.06m | 8:21PM0.08m | 7:44PM0.09m | 4:42AM0.16m | 7:27PM0.08m | 5:25AM0.10m | 7:24PM0.07m | |||||||||
 |  | |  |  | | | |  | |  | |  | | | | | | | |
 | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — |
 | 6:00 | — | 6:00 | — | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:05 | — |
mm | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — | — | — |
Temp °C | 14 | 12 | 14 | 15 | 13 | 13 | 13 | 14 | 15 | 15 | 15 | 13 | 14 | 13 | 12 | 12 | 11 | 11 | 11 |
Feels °C | 10 | 9 | 10 | 11 | 10 | 11 | 13 | 10 | 12 | 12 | 11 | 9 | 10 | 5 | 5 | 7 | 8 | 7 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 16 |
| kJ | 3402 | 2668 | 3865 | 4084 | 3330 | 2880 | 2449 | 3721 | 2726 | 1446 | 902 | 661 | 4066 | 6288 | 3713 | 2557 | 1430 | 864 | 1248 |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 18 | — | S 26 | SW 23 | SW 21 | SW 19 | — | — | SW 21 | SW 20 | SW 18 | SW 13 | — | — | — | SW 18 | SSW 17 | SW 24 |
| kJ | 392 | 1019 | — | 13 | 140 | 664 | 1268 | — | — | 18 | 60 | 159 | 990 | — | — | — | 152 | 184 | 144 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | NW 4 | — | — | — | — | — | — | SW 24 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — | — | — | 198 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NW 5 | — | SW 16 | SW 16 | — | — | — | NW 4 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 53 | — | 2527 | 4405 | — | — | — | 17 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 198 | 153 | 316 | 126 | 126 | 153 | 0 | 151 | 42 | 0 | 42 | 0 | 152 | 198 | 153 | 126 | 42 | 42 | 42 |
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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