Surf Forecasts:
Flatrock surf forecast from 4 Sep 2026:
- Best quality surf: Saturday 5 Sep, 6PM (local time) - 16ft (5.0m), 14s period, SW swell with cross-onshore winds.
- Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 13ft (4.0m), 18s period, SSW swell with 10,070 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 6PM (local time) - 16ft (5.0m), 14s 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 (Sep 05) at 6PM. The primary swell is predicted to be 5.0m and 14s period with a secondary swell of 4.0m and 14s. 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 4.0m 18s and forecast to arrive on Wednesday (Sep 09) 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 0.5m 3s period and expected on Monday (Sep 07) at 3PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sat 5th Sep) | 16ft (5.0m) 14s |
| Best Surf | 6PM (Sat 5th Sep) | 16ft (5.0m) 14s |
| Most Powerful | 12PM (Wed 9th Sep) | 13ft (4.0m) 18s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it. We’ve only got one spot on the radar for this stretch, and it’s a proper reef set-up that’s gonna take some serious respect.
The outlook starts with a bit of a shaky start. Saturday the 5th is a total write-off – strong winds and a big, ugly swell at 13ft from the SW. That’s 4473 in the water (combined energy), and with the wind howling, it’s just a mess. Don’t even think about it. Sunday the 6th is still a bit iffy, with a 10ft SW swell on the morning, but the wind drops right off to nearly nothing, going straight offshore. That’s a huge positive – glassy conditions on a 10ft reef break. The period is 14 seconds, which is proper groundswell, but on a reef that’s a good thing. It’s a big day for experienced surfers only though, this is not for the faint-hearted.
The real standout, the one you’re waiting for, starts to build from Monday the 8th and then peaks on Thursday the 10th. Tuesday morning the 8th is a beauty: 8ft of SW swell with a 17-second period (that’s a very long period groundswell), and a light offshore breeze. The combined energy is 4043, so it’s got some serious push. That reef (Flatrock) is going to be handling that perfectly. The water is 59°, which is about average for this time of year, so no surprises there.
But the absolute best of this run is Thursday the 10th. Clear skies, 12ft of SSW swell, 16-second period, and a clean, moderate offshore wind out of the ESE. The energy is pumping at 7393. This is proper, heavy, lined-up surf for the experts. The crowd situation is “sometimes” here, so you might have a few others in the know, but it’s not gonna be a circus.
Following that, we get a bit of a drop-off. Friday the 11th is still clean, but the swell eases to 8ft. The second week gets a bit more mixed. There’s a promising window on the 16th and 17th of September. Wednesday the 16th brings a clean 10ft SW swell with a 17-second period and offshore winds, 5063 energy. Then Thursday the 17th looks even better on paper: 12ft SW swell, 17-second period, 6549 energy, with a light offshore breeze. That is a long-range standout and it looks promising, but we’re a week and a half out, so keep an eye on it. After that, the wind turns nasty on the 18th and the swell drops, so the run fizzles out.
Overall, this is a strike mission for the experts. The 10th of September is your best bet, with the 17th as a long-range potential. The rest of the time, it’s either too big and windy, or just messy. If you’re not comfortable on a heavy reef with 10ft+ swell, give it a miss.
- Rusty
Short Range ForecastMostly dry. Very mild (max 13°C on Sat morning, min 11°C on Mon night). Winds decreasing (strong winds from the WSW on Sat morning, light winds from the WSW by Sat night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 13°C on Tue morning, min 10°C on Tue night). Winds increasing (light winds from the SE on Tue morning, strong winds from the SSE by Tue night). | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
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 12 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4473 | 5095 | 4835 | 3369 | 2570 | 1367 | 841 | 990 | 4104 | 4043 | 3427 | 6551 | 10049 | 9319 | 8698 | 7393 | 5848 | 3574 | 2445 | 2412 | 2731 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | cross-on | cross-off | cross-off | cross-off | off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | off | off | off | cross-off | cross-off | cross-off |
High Tide | 11:34AM0.36m | 11:20AM0.44m | 11:40AM0.50m | 1:53AM0.20m | 12:02PM0.53m | 00:52AM0.23m | 12:22PM0.55m | 00:39AM0.29m | 12:41PM0.53m | 00:43AM0.36m | 12:56PM0.51m | 00:57AM0.43m | |||||||||
Low Tide | 8:15PM-0.00m | 8:01PM0.01m | 7:45PM0.03m | 4:35AM0.18m | 7:30PM0.05m | 5:23AM0.12m | 7:19PM0.07m | 5:58AM0.06m | 7:12PM0.07m | 6:29AM0.03m | 7:09PM0.06m | ||||||||||
 |  |  | |  |  | | | | | | | | |  | | | | | | | |
 | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — |
 | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 13 | 13 | 13 | 12 | 13 | 13 | 12 | 13 | 13 | 13 | 11 | 12 | 11 | 12 | 13 | 12 | 16 | 16 | 16 |
Feels °C | 2 | 5 | 7 | 10 | 10 | 8 | 8 | 8 | 9 | 10 | 9 | 7 | 3 | 4 | 4 | 6 | 8 | 8 | 14 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SSW 19 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 16 |
| kJ | — | — | 4835 | 3369 | 2570 | 1367 | 841 | 990 | 4104 | 4043 | 3427 | 6551 | 10049 | 9319 | 8698 | 7393 | 5848 | 3574 | 2445 | 2412 | 2731 |
Swell 2 Height (m) Direction Period (s) | — | — | — | WSW 16 | — | SW 22 | SW 21 | SSW 20 | SW 13 | — | — | — | SSW 20 | — | — | — | SW 26 | SSW 24 | SSW 24 | — | — |
| kJ | — | — | — | 691 | — | 20 | 224 | 705 | 1191 | — | — | — | 3882 | — | — | — | 26 | 58 | 55 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | S 8 | S 9 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 1 | 14 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 12 | SW 14 | — | — | — | — | — | SE 3 | — | — | — | SW 16 | SSE 6 | — | — | — | — | — | — | — | — |
| kJ | 4473 | 5095 | — | — | — | — | — | 5 | — | — | — | 4588 | 329 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1215 | 1339 | 198 | 74 | 153 | 74 | 126 | 152 | 0 | 0 | 198 | 153 | 1373 | 1736 | 884 | 152 | 0 | 0 | 74 | 0 | 74 |
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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