Surf Forecasts:
Flatrock surf forecast from 12 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 9AM (local time) - 10ft (3.0m), 15s period, SSW swell with offshore winds.
- Most powerful swell: Wednesday 16 Sep, 12PM (local time) - 10ft (3.0m), 15s period, SSW swell with 4,487 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 9AM (local time) - 10ft (3.0m), 15s 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 Wednesday (Sep 16) at 9AM. The primary swell is predicted to be 3.0m and 15s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 3.0m 15s and forecast to arrive on Wednesday (Sep 16) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Thursday (Sep 17) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Best Surf | 9AM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Most Powerful | 12PM (Wed 16th Sep) | 10ft (3.0m) 15s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, listen up. We’re only looking at Flatrock for this whole stretch, a reef break that’s for the advanced crew. There’s surf on the way, but plenty of days where the wind or the size will mess with you. Let’s sort the wheat from the chaff.
Sunday the 13th kicks off with 5ft to 6ft from the SW, a long 16-second period, and heaps of energy (1273 to 1513). But the wind is howling onshore from the west at 15 mph, making it messy. Monday the 14th is still onshore and choppy. Not worth it yet.
Tuesday the 15th is the first real turn. Swell jumps to 10ft from the SW, 15-second period, energy at (3466). Wind swings to a cross-off from the SSE at 15 mph, keeping it clean. That’s serious, but 10ft is expert territory. Wednesday the 16th is even better: light offshore from the ESE at 15 mph, swell at 10ft from the SSW, energy roaring at (4372). That’s a standout morning for the brave.
Thursday the 17th drops to 7ft, still clean in the morning, energy at (1746). Fun, but not the highlight. Then Friday the 18th and Saturday the 19th are washed out with lumpy wind and dropping swell. Sunday the 20th is a mess with 25 mph cross-onshore.
Now, Monday the 21st is pure gold. Glassy morning, light offshore from the east at 6 mph, 8ft from the SW, energy (2187). Clean, powerful. That’s a session to remember.
Tuesday the 22nd of September is the absolute king. Morning has 12ft from the SW, 16-second period, energy at (6901). Then the afternoon goes dead calm – glassy, 0 mph wind, same 12ft swell, energy (5335). Exceptional for experts. Perfect, heavy waves.
Wednesday the 23rd stays clean with 8ft to 8ft, and Thursday the 24th is another monster: 12ft from the SW with an 18-second period, the longest of the forecast, and a massive energy of (8536) in the morning. Very long period groundswell – on this reef, it’s a dream. Light offshore from the NNE at 9 mph. That’s another standout.
Friday the 25th gets lumpy again, but Saturday the 26th afternoon brings a late gem: offshore wind from the ESE at 15 mph, 8ft from the WSW, clean. Sunday the 27th is huge – 13ft to 18ft from the SW and SSW, offshore winds, energy at (12433) and (27069). But that 18ft is likely too big for this break, even for experts. Only for the mad ones.
Monday the 28th closes strong with 12ft from the SSW, 16-second period, light offshore from the east, energy (7518). Exceptional for experts.
Water temps are about average for this time of year.
The real standouts are Tuesday the 22nd (glassy, 12ft, SW) and Thursday the 24th (12ft, 18-second period, clean offshore). Those are the days to mark on the calendar.
Rusty.
Short Range ForecastMostly dry. Very mild (max 16°C on Mon night, min 9°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Fri night, min 9°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 13 | SW 12 | SW 16 | SW 15 | SW 14 | SW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 17 | SW 16 | SW 15 | SW 13 | SW 17 | WSW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1852 | 1513 | 757 | 1021 | 736 | 3171 | 3419 | 3372 | 3820 | 4372 | 4278 | 3156 | 1735 | 1204 | 888 | 1626 | 1115 | 685 | 299 | 354 | 1739 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | on | cross | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-on | cross-off | cross | cross-on | cross-off | cross | cross-on | on |
High Tide | 1:19PM0.44m | 1:36AM0.53m | 1:28PM0.41m | 1:58AM0.55m | 1:35PM0.38m | 2:21AM0.55m | 1:40PM0.36m | 2:44AM0.52m | 1:41PM0.34m | 3:08AM0.48m | 1:32PM0.33m | 3:32AM0.43m | 1:00PM0.33m | ||||||||
Low Tide | 7:15PM0.01m | 7:50AM0.05m | 7:25PM-0.02m | 8:13AM0.08m | 7:36PM-0.03m | 8:33AM0.13m | 7:49PM-0.03m | 8:52AM0.17m | 8:02PM-0.02m | 9:06AM0.22m | 8:11PM0.00m | 9:08AM0.28m | 8:12PM0.03m | ||||||||
 | |  |  |  |  | | | | | | | | | | | | | | | | |
 | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:28 | — | — | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — |
 | — | 6:16 | — | — | 6:17 | — | — | 6:19 | — | — | 6:20 | — | — | 6:20 | — | — | 6:21 | — | — | 6:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 13 | 13 | 15 | 16 | 13 | 12 | 10 | 11 | 11 | 11 | 13 | 13 | 15 | 18 | 19 | 20 | 21 | 24 | 24 |
Feels °C | 10 | 9 | 10 | 10 | 12 | 12 | 6 | 5 | 4 | 5 | 5 | 7 | 11 | 10 | 12 | 12 | 14 | 15 | 13 | 16 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 15 | SW 13 | SW 12 | SW 16 | SW 15 | SW 14 | SW 15 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 17 | SW 16 | SW 15 | SW 13 | SW 17 | WNW 8 |
| kJ | 1852 | 1513 | 757 | 1021 | 736 | 3171 | 3419 | 3372 | 3820 | 4372 | 4278 | 3156 | 1735 | 1204 | 888 | 1626 | 1115 | 685 | 299 | 354 | 370 |
Swell 2 Height (m) Direction Period (s) | — | — | SSW 11 | SW 19 | SW 18 | S 9 | — | — | — | — | — | — | S 24 | SSW 22 | SSW 18 | — | — | NW 5 | SW 19 | SW 13 | SW 15 |
| kJ | — | — | 23 | 177 | 375 | 2 | — | — | — | — | — | — | 11 | 46 | 431 | — | — | 10 | 123 | 168 | 733 |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 11 | SW 18 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 12 |
| kJ | — | — | — | 20 | 442 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 212 |
Wind waves Height (m) Direction Period (s) | — | — | WSW 6 | — | — | SW 16 | — | — | — | — | — | E 4 | — | — | — | N 4 | NNW 4 | NNW 5 | NNW 5 | NW 7 | WSW 15 |
| kJ | — | — | 100 | — | — | 1953 | — | — | — | — | — | 10 | — | — | — | 14 | 16 | 18 | 80 | 253 | 1739 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 162 | 523 | 315 | 360 | 294 | 153 | 153 | 153 | 153 | 0 | 152 | 0 | 74 | 78 | 0 | 44 | 42 | 42 | 204 | 78 | 822 |
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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