
Surf Forecasts:
Flatrock surf forecast from 7 Aug 2026:
- Best quality surf: Monday 10 Aug, 6AM (local time) - 18ft (5.5m), 17s period, SW swell with cross-onshore winds.
- Most powerful swell: Thursday 13 Aug, 12AM (local time) - 21ft (6.5m), 15s period, SW swell with 20,544 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 6AM (local time) - 18ft (5.5m), 17s 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 Monday (Aug 10) at 6AM. The primary swell is predicted to be 5.5m and 17s period with a secondary swell of 4.0m and 17s. The wind is predicted to be cross-onshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 6.5m 15s and forecast to arrive on Thursday (Aug 13) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 6s period and expected on Sunday (Aug 09) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 10th Aug) | 18ft (5.5m) 17s |
| Best Surf | 6AM (Mon 10th Aug) | 18ft (5.5m) 17s |
| Most Powerful | 12AM (Thu 13th Aug) | 21ft (6.5m) 15s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
G’day, it’s Rusty here.
We’ve got a wild 16-day stretch coming up for Flatrock, so let’s break it down.
Right out of the gate, the first few days are a mess. Friday the 7th and Saturday the 8th are rideable but ugly – think 8ft of SW swell hitting a lumpy cross-chop. It’s not going to be pretty, and the energy numbers are weak to moderate, around 3709 to 2309. Not worth stressing about.
Then things get properly nasty. From Sunday the 9th through Wednesday the 12th, we’ve got gale-force winds and a building swell. This is full-blown blown-out chaos. Swell heights jump to 13ft and energy spikes into the thousands, but it’s all for nothing – completely unsurfable. If you’re a kite surfer, this is your window, but for paddle surfing, forget it.
Now, the first real standout of the window is Thursday the 13th. We see an 18ft SW swell pumping in with a 16 second period, and the energy is massive – 23373. But here’s the catch: the comment says it's too big for this reef break. This is expert-only territory, and even then, it’s a big ask.
After that, the surf settles down, but it’s still not ideal. Friday and Saturday the 14th and 15th bring some cleaner conditions. Saturday morning the 15th is a highlight – 12ft of SW with 16 seconds, and the wind is dead glassy. That’s the kind of session you dream about, even if it’s a bit heavy. The energy is 5540, which is strong, but the quality should be there.
Sunday the 16th drops off in size to 6-6ft, but it’s clean with cross-off winds. It’s a smaller, more user-friendly wave, good for experienced surfers.
There’s a lull around Monday the 17th, nothing special. But then Tuesday the 18th morning – that’s the second standout. 10ft of SW swell with a 17 second period, clean, and the wind is cross-off. Energy’s at 4491. This is a proper groundswell, point-break style. It’s going to be well-shaped and have some power.
The rest of that week stays rideable – Wednesday and Thursday the 19th and 20th are in the 8-10ft range, with clean conditions in the mornings and some lumpiness in the afternoons.
We end the second week strong. Friday the 21st is another cracker: 10ft with a 15-second period, moderate offshore wind in the morning, and then glassy in the afternoon. The energy is moderate to strong. The 22nd fades out with smaller, choppier surf.
So overall, we’ve got two true standouts: Saturday the 15th for the glassy, big-swell perfection, and Tuesday the 18th for a proper clean groundswell. The long-range stuff is promising but not as certain, so keep an eye on it. It’s an exposed reef, SW is the money direction, and the water temp is 59°, right around average for this time of year.
Take care out there.
Rusty
Short Range ForecastHeavy rain (total 23mm), heaviest during Sun morning. Very mild (max 17°C on Fri afternoon, min 11°C on Sun morning). Winds increasing (moderate winds from the NNW on Fri afternoon, gales from the SW by Sun afternoon). | Days 4-6 Weather SummaryModerate rain (total 15mm), heaviest on Tue afternoon. Very mild (max 15°C on Tue morning, min 11°C on Tue night). Winds decreasing (near gales from the WNW on Tue afternoon, moderate winds from the WSW by Wed night). | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 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 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | SW 16 | SW 15 | SW 18 | SW 17 | SW 16 | SW 16 | WSW 14 | WSW 10 | SW 17 | SW 19 | SW 16 | SW 15 | SW 16 | SW 16 | SW 15 |
Wave Graph | |||||||||||||||||||||
3678 | 3597 | 2676 | 2768 | 2309 | 1580 | 6849 | 6834 | 10814 | 8307 | 6394 | 4645 | 3224 | 2216 | 9209 | 11907 | 8990 | 20544 | 15675 | 6604 | 4334 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross | cross-on | on | on | cross-on | cross-on | on | on | on |
High Tide | 10:26AM0.43m | 11:28AM0.50m | 12:06PM0.56m | 1:39AM0.14m | 12:38PM0.60m | 1:07AM0.18m | 1:05PM0.60m | 1:06AM0.23m | 1:27PM0.58m | 1:18AM0.29m | |||||||||||
Low Tide | 9:16PM0.04m | 8:51PM0.03m | 8:33PM0.03m | 8:25PM0.03m | 4:35AM0.12m | 8:22PM0.05m | 5:35AM0.07m | 8:19PM0.08m | 6:18AM0.04m | 8:14PM0.09m | |||||||||||
7:18 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — | 7:11 | — | — | |
— | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | |
mm | — | — | — | — | 2 | 7 | 9 | 5 | — | — | — | 2 | — | 7 | 3 | 2 | 1 | — | — | — | — |
Temp °C | 14 | 17 | 14 | 16 | 17 | 14 | 12 | 12 | 13 | 13 | 14 | 14 | 15 | 12 | 13 | 14 | 14 | 13 | 14 | 14 | 15 |
Feels °C | 8 | 12 | 9 | 12 | 11 | 7 | 0 | -1 | 1 | 7 | 8 | 8 | 4 | 1 | 2 | 4 | 5 | 5 | 9 | 9 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 14 | — | — | — | SW 17 | SW 16 | SW 16 | WSW 14 | SSW 18 | — | — | — | SW 15 | SW 16 | SW 16 | SW 15 |
3678 | 3597 | 2676 | 2768 | 2309 | 1580 | — | — | — | 8307 | 6394 | 4645 | 3224 | 553 | — | — | — | 20544 | 15675 | 6604 | 4334 | |
Swell 2 Height (m) Direction Period (s) | SSE 8 | — | — | — | — | — | — | — | — | — | — | — | — | SSW 15 | — | — | — | — | — | — | — |
6 | — | — | — | — | — | — | — | — | — | — | — | — | 294 | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | NNW 4 | NNW 5 | NNW 5 | NNW 6 | — | NNW 5 | SW 16 | SW 15 | SW 18 | — | — | NW 6 | NW 8 | WSW 10 | SW 17 | SW 19 | SW 16 | SW 16 | SW 16 | — | — |
25 | 35 | 62 | 36 | — | 85 | 6849 | 6834 | 10814 | — | — | 293 | 1052 | 2216 | 9209 | 11907 | 8990 | 7619 | 7698 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 204 | 44 | 42 | 189 | 204 | 204 | 294 | 761 | 1125 | 162 | 317 | 882 | 884 | 1250 | 884 | 884 | 1385 | 871 | 162 | 316 |
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.











