Surf Forecasts:
Flatrock surf forecast from 9 Aug 2026:
- Best quality surf: Monday 10 Aug, 9AM (local time) - 16ft (5.0m), 17s period, SW swell with cross-onshore winds.
- Most powerful swell: Monday 10 Aug, 9AM (local time) - 16ft (5.0m), 17s period, SW swell with 14,444 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 9AM (local time) - 16ft (5.0m), 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 9AM. The primary swell is predicted to be 5.0m 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 5.0m 17s and forecast to arrive on Monday (Aug 10) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 10th Aug) | 16ft (5.0m) 17s |
| Best Surf | 9AM (Mon 10th Aug) | 16ft (5.0m) 17s |
| Most Powerful | 9AM (Mon 10th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
We got a flat spell to start. The first few days are a total loss for Flatrock. The swell’s maxing out at over 16 feet, and the wind is all over the place—cross-onshore and strong. It’s a full-on washing machine, not a surfable wave. We’re looking at a solid four-day gap of nothing.
Then around Thursday the 13th, the swell backs down to a still-sizable 12 feet, but the wind is still on it, making it lumpy and poor. Friday’s the same. It ain’t until Saturday the 15th that we get a real window. The wind swings cross-offshore, the ocean cleans up, and we’ve got 10 feet of SW swell with a 16-second period. That’s proper groundswell, and at a reef like Flatrock, that long period is going to line up nicely. It’s still big, so this is for the experienced crew only. The energy is strong, with values of 4181, but the tide and conditions are finally working together. Sunday the 16th eases off a touch to 7 feet, still clean with that cross-off wind, and the energy is moderate at 1945. That’s a good, solid day.
The start of the next week, Monday the 17th and Tuesday the 18th, have some nice clean mornings with the swell dropping to 6-6 feet. The period is still long, 16-19 seconds, and the wind is light or cross-off. These are the days that will be the most user-friendly for the advanced surfer, though it’s still a reef and the sets will be powerful. The energy is moderate, around 1595-2528. The water temp is about average for this time of year, which is fine.
But the surf gods take it away again. From Wednesday the 19th, the wind picks up and turns onshore, and the conditions get messy. There’s a couple of days of junky surf, then a spike of bigger, 10-13 foot swell on the 20th that’s just cross-shore and lumpy. We get a brief reprieve on Friday the 21st with a clean, cross-off morning and 10 feet of swell, but the wind shifts onshore by the afternoon.
The last few days of the window are a write-off. From Saturday the 22nd through to the 25th, it’s strong winds, onshore and cross-onshore, with rain and blown-out conditions. The swell is there, but it’s just messy and hopeless. The best of the run is definitely the clean, cross-off mornings from the 15th through to the 18th, with the standout being Saturday the 15th—big, clean, and powerful. Just don’t bring your soft-top.
Rusty
Short Range ForecastModerate rain (total 13mm), heaviest on Tue afternoon. Very mild (max 14°C on Sun night, min 11°C on Tue night). Winds decreasing (near gales from the SSW on Sun night, moderate winds from the NNW by Mon night). | Days 5-7 Weather SummaryMostly dry. Very mild (max 15°C on Thu night, min 12°C on Sat morning). Wind will be generally light. | ||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||
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 19 | SW 17 | SW 16 | SW 16 | WSW 14 | SW 18 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SSW 15 | SSW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 11712 | 14444 | 5896 | 3631 | 3380 | 2960 | 8240 | 13199 | 11861 | 6207 | 6647 | 5394 | 5445 | 7895 | 6465 | 4645 | 4181 | 3903 | 2577 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | on | cross-on | cross-on | cross | cross-off | cross-off | off |
High Tide | 12:06PM0.56m | 1:39AM0.14m | 12:38PM0.60m | 1:07AM0.18m | 1:05PM0.60m | 1:06AM0.23m | 1:27PM0.58m | 1:18AM0.29m | 1:44PM0.55m | 1:37AM0.36m | 1:57PM0.50m | 2:01AM0.41m | |||||||
Low Tide | 8:25PM0.03m | 4:35AM0.12m | 8:22PM0.05m | 5:35AM0.07m | 8:19PM0.08m | 6:18AM0.04m | 8:14PM0.09m | 6:55AM0.02m | 8:11PM0.09m | 7:28AM0.03m | 8:12PM0.07m | ||||||||
 |  | |  |  |  | |  |  |  | | |  | | |  | | | | |
 | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — | 7:11 | — | — | 7:09 | — | — | 7:09 | — | — |
 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:57 | — |
mm | 3 | — | — | 2 | — | 5 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 12 | 13 | 14 | 14 | 14 | 12 | 14 | 14 | 13 | 14 | 14 | 15 | 15 | 14 | 14 | 13 | 13 | 13 |
Feels °C | 5 | 5 | 8 | 9 | 5 | 5 | 2 | 7 | 8 | 8 | 11 | 10 | 12 | 11 | 10 | 11 | 9 | 8 | 10 |
Swell 1 Height (m) Direction Period (s) | — | SW 17 | SW 16 | SW 16 | SW 14 | SW 18 | — | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SSW 15 | SSW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 14 |
| kJ | — | 14444 | 5896 | 3631 | 2643 | 2960 | — | 13199 | 11861 | 6207 | 6647 | 5394 | 5445 | 7895 | 6465 | 4645 | 4181 | 3903 | 2577 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 19 | SW 17 | — | — | WSW 14 | WNW 8 | SW 17 | SW 17 | SW 17 | — | — | — | — | — | — | — | — | — | — |
| kJ | 11712 | 8405 | — | — | 3380 | 727 | 8240 | 8463 | 7935 | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 485 | 871 | 1099 | 162 | 881 | 692 | 1189 | 894 | 871 | 316 | 238 | 316 | 151 | 74 | 153 | 74 | 0 | 152 | 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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