Surf Forecasts:
Flatrock surf forecast from 7 Sep 2026:
- Best quality surf: Thursday 10 Sep, 6AM (local time) - 11ft (3.5m), 16s period, SSW swell with offshore winds.
- Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,156 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 6AM (local time) - 8ft (2.5m), 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 Tuesday (Sep 08) at 6AM. The primary swell is predicted to be 2.5m and 17s 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 4.0m 19s and forecast to arrive on Wednesday (Sep 09) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Sep 09) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 8th Sep) | 8ft (2.5m) 17s |
| Best Surf | 6AM (Thu 10th Sep) | 11ft (3.5m) 16s |
| Most Powerful | 9AM (Wed 9th Sep) | 13ft (4.0m) 19s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s headed our way for Flatrock. We’ve got a big, long period groundswell on the radar, but it’s not a week for beginners—this is serious water.
The action kicks off on Tuesday, the 8th of September. Early morning we’re looking at a solid 8ft swell from the SW, with a very long 17-second period. This is proper energy (4043), but it’s an advanced-only affair. The wind is light offshore from the ESE, just 3 mph, so it’ll be glassy and clean. This is a standout moment—the vibe is excellent for those who can handle it. The water temperature is about average for this time of year.
Come Tuesday afternoon, things go south quick. The wind swings onshore from the S at 16 mph, turning it into a cross-shore mess.
Wednesday, the 9th, the swell jumps to a massive 13ft from the SSW, with an even longer 19-second period. The energy reading is a whopping (10340). This is heavy-duty power. Early morning is clear with a cross-offshore breeze from the SE at 22 mph, keeping it surprisingly clean for such a big day. This is the other standout—huge, powerful waves for experts only. The afternoon stays similar size but the wind is still full.
Thursday the 10th still has a solid 12ft to 10ft SSW swell. Morning brings a fresh offshore from the E at 19 mph, leaving the surf clean. Afternoon eases a touch to 10ft with a lighter offshore breeze—still a great session for the advanced crew.
From Friday the 11th onward, the swell starts to dip. Friday morning is 8ft from the SSW, but with a cross-offshore wind. The energy is still moderate (2178). By the weekend, the swell drops to around 5ft to 6ft, but the winds get messy. Saturday morning is a cross-offshore, but the surf is small and the quality is marginal.
Sunday the 13th and Monday the 14th are pretty poor. The swell fades a little, but the wind is cross-shore or onshore and choppy. Not worth paddling out.
Tuesday the 15th sees a bit of a rebound. Morning offers a clean 7ft SW groundswell with a gentle offshore breeze from the E. The energy (2124) is moderate, and the conditions are clean. This is a nice window for experienced surfers again.
Wednesday the 16th morning is another highlight: a clean 10ft from the SW, very light offshore wind, and strong energy (3842). That will be a clean, powerful morning.
After that, the outlook gets blustery. Thursday the 17th is small and average. Friday the 18th is a write-off: strong winds up to 28 mph from the NNW blow it out. The weekend of the 19th and 20th has more size (12ft to 7ft), but near-gale force onshore winds ruin it. Not for paddle surfing—this looks like a kite session.
The final days, from the 21st to the 23rd of September, see the swell hang around 7ft to 8ft, but the winds are either cross-shore or onshore with rain. Energy is moderate, but the quality is poor for a surfer.
So, if you’re a grommet or a weekend warrior, stay home this week. The big winners are Tuesday morning, the 8th of September, and Wednesday morning, the 9th of September, for expert surfers only.
Stay safe out there.
Rusty.
Short Range ForecastMostly dry. Very mild (max 13°C on Thu morning, min 10°C on Tue night). Winds increasing (light winds from the ESE on Tue morning, strong winds from the SSE by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Sat afternoon, min 11°C on Thu night). Winds increasing (light winds from the NNW on Fri morning, strong winds from the N by Sat night). | ||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 18 | SW 17 | SW 16 | SSW 16 | SSW 19 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 |
Wave Graph  | |||||||||||||||||||
 kJ | 4373 | 4043 | 3543 | 4523 | 10156 | 8608 | 7109 | 5319 | 4056 | 2445 | 2178 | 2731 | 2535 | 1187 | 1707 | 1858 | 1256 | 1082 | 685 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross | cross-off | cross-off | cross-on | cross-off | cross | cross-on | on |
High Tide | 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 | 1:08PM0.47m | 1:15AM0.49m | 1:19PM0.44m | 1:36AM0.53m | ||||||
Low Tide | 4:35AM0.18m | 7:30PM0.05m | 5:23AM0.12m | 7:19PM0.07m | 5:58AM0.06m | 7:12PM0.07m | 6:29AM0.03m | 7:09PM0.06m | 6:58AM0.02m | 7:10PM0.04m | 7:25AM0.03m | 7:15PM0.01m | |||||||
 |  | | |  | |  | | | | |  | | | | | | | | |
 | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — |
 | 6:13 | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 12 | 12 | 12 | 11 | 12 | 11 | 13 | 13 | 12 | 16 | 17 | 17 | 19 | 21 | 21 | 19 | 18 | 17 |
Feels °C | 8 | 8 | 7 | 5 | 3 | 5 | 4 | 7 | 7 | 7 | 14 | 15 | 12 | 14 | 17 | 17 | 11 | 14 | 17 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 17 | SW 16 | SSW 16 | SSW 19 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 16 | SW 15 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 |
| kJ | 4373 | 4043 | 3543 | 4523 | 10156 | 8608 | 7109 | 5319 | 4056 | 2445 | 2178 | 2731 | 2535 | 1187 | 1707 | 1858 | 1256 | 1082 | 685 |
Swell 2 Height (m) Direction Period (s) | SW 13 | — | — | — | — | — | — | — | SW 26 | SSW 24 | — | — | — | SW 18 | S 10 | SW 18 | S 10 | — | — |
| kJ | 1286 | — | — | — | — | — | — | — | 26 | 58 | — | — | — | 743 | 50 | 891 | 8 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | S 11 | — | SSE 9 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 85 | — | 29 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | SSE 6 | SE 6 | — | — | — | E 5 | — | E 4 | — | — | N 4 | NNW 4 | NNW 4 | NW 5 | NW 6 | W 6 |
| kJ | — | — | — | 122 | 184 | — | — | — | 27 | — | 14 | — | — | 16 | 17 | 16 | 111 | 135 | 73 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 698 | 153 | 1373 | 1736 | 152 | 152 | 0 | 0 | 74 | 74 | 74 | 44 | 42 | 44 | 624 | 151 | 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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