
Surf Forecasts:
Flatrock surf forecast from 3 Sep 2026:
- Best quality surf: Monday 7 Sep, 9PM (local time) - 8ft (2.5m), 19s period, SSW swell with offshore winds.
- Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,651 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 9PM (local time) - 11ft (3.5m), 15s 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 Thursday (Sep 03) at 9PM. The primary swell is predicted to be 3.5m and 15s period. The wind is predicted to be glassy 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 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 1.5m 6s period and expected on Wednesday (Sep 09) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 3rd Sep) | 11ft (3.5m) 15s |
| Best Surf | 9PM (Mon 7th Sep) | 8ft (2.5m) 19s |
| Most Powerful | 12PM (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 get into it.
We’ve got one spot on the radar for the next couple of weeks: Flatrock, a reef break for the advanced crew. The water temp is sitting at 59.7°, which is only about 1.1° above the norm for this time of year, so pretty average – nothing to write home about there.
The first real action kicks off Thursday afternoon, September 3rd. We’re seeing a solid 11.5ft SW groundswell rolling in with a long period of 15 seconds, packing a massive punch (combined energy 4890). The wind is a cross-on shore though, making it a bit choppy and messy. It’s surfable if you’re desperate, but the quality is marginal. Not the best way to start.
Friday morning, September 4th, is where it gets interesting. The swell hangs in at 11.5ft from the SW, but the period jumps to 16 seconds. The wind swings to a cross-offshore from the NE, cleaning things up nicely. The energy is still huge (5722). This is a standout session for the experienced crew – big, clean, powerful groundswell on a reef. Expect a crowd out there, though.
Friday afternoon the wind turns nasty, and Saturday is a total write-off with onshore gales and lumpy, dangerous conditions. Skip it.
Sunday morning, September 6th, is another gem. The swell drops to a still-strong 10.0ft from the SW, period 14 seconds, and the wind is a light cross-offshore from the NNE. Clean as a whistle, with moderate energy (3556). This is the best of the first week – a classic, clean barrel session for the experts. Sunday afternoon is still rideable but gets a bit lumpy.
Monday and Tuesday morning the 8th are interesting. Tuesday morning sees a shift to a SSW swell with a massive 17-second period and very strong energy (5051). The wind is light cross-off, making it clean. This is a long-period groundswell, so it’ll be walling up nicely on the reef, but the sets will be spaced out. This is a second standout for the week.
The rest of the first week and into the second week is a mixed bag. Wednesday September 9th has huge SSW swell (13.0ft, 19 seconds, energy 10429) but with strong cross-offshore winds, making it challenging but clean. Thursday September 10th is the pick of the second week: an 11.5ft SSW swell at 17 seconds, with a fresh offshore E wind. Clean and powerful (energy 7282). This is a solid call for the experienced crew.
After that, the swell slowly fades through the weekend and into the next week. The conditions get sloppier, with onshore winds and rain returning by Monday September 14th. The swell bumps back up mid-week, but it’s accompanied by near gale-force winds, turning it into a blown-out mess. By Thursday September 17th, the wind eases but the swell is still big and choppy – looks more like a kite-surfing session than a paddle session.
The last window, Friday September 18th, is a fade-out with smaller, weaker swell and light onshore breezes. Not worth paddling out for.
Best on offer: Friday morning September 4th (clean, big, long-period SW groundswell) and Thursday morning September 10th (clean, offshore, big SSW groundswell). Both are for experts only.
Stay safe out there, and don't get caught inside on those big sets.
Short Range ForecastLight rain (total 4mm), mostly falling on Thu night. Very mild (max 18°C on Fri morning, min 11°C on Sun morning). Winds increasing (calm on Thu night, near gales from the WSW by Fri night). | Days 5-7 Weather SummarySome drizzle, heaviest during Tue afternoon. Very mild (max 14°C on Mon morning, min 11°C on Tue afternoon). Winds increasing (light winds from the S on Sun afternoon, strong winds from the SE by Tue night). | |||||||||||||||||||
Thu 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 13 | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 18 | SSW 19 | SSW 18 |
Wave Graph | ||||||||||||||||||||
4890 | 6236 | 5722 | 4885 | 3170 | 4913 | 6989 | 4332 | 3017 | 2439 | 1200 | 854 | 711 | 4839 | 5051 | 3832 | 3294 | 7484 | 10429 | 9319 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-off | cross-on | on | on | cross-on | on | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 3:47AM0.47m | 1:07PM0.31m | 4:29AM0.42m | 11:20AM0.44m | 11:40AM0.50m | 1:53AM0.20m | 12:02PM0.53m | 00:52AM0.23m | 12:22PM0.55m | 00:39AM0.29m | ||||||||||
Low Tide | 8:22PM-0.01m | 9:50AM0.27m | 8:21PM-0.01m | 9:26AM0.36m | 8:15PM-0.00m | 8:01PM0.01m | 7:45PM0.03m | 4:35AM0.18m | 7:30PM0.05m | 5:23AM0.12m | 7:19PM0.07m | |||||||||
— | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | |
6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | — | 6:15 | — | |
mm | — | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 14 | 13 | 18 | 18 | 16 | 13 | 13 | 13 | 12 | 13 | 12 | 14 | 14 | 13 | 13 | 12 | 12 | 12 | 12 | 10 |
Feels °C | 11 | 11 | 14 | 13 | 11 | 5 | 6 | 9 | 9 | 10 | 8 | 8 | 8 | 9 | 10 | 5 | 5 | 4 | 4 | 2 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | — | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 18 | SSW 19 | SSW 18 |
4890 | 6236 | 5722 | 4885 | 3170 | — | 6989 | 4332 | 3017 | 2439 | 1200 | 854 | 711 | 4839 | 5051 | 3832 | 3294 | 7484 | 10429 | 9319 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | WSW 16 | — | SW 22 | SSW 21 | SW 20 | SW 18 | — | — | SW 25 | SSW 22 | — | — |
— | — | — | — | — | — | — | — | 539 | — | 20 | 178 | 580 | 3462 | — | — | 658 | 2773 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | W 6 | SW 13 | SW 14 | — | — | — | — | — | S 7 | E 5 | — | — | SE 6 | SE 5 | — | — |
— | — | — | — | 181 | 4913 | 4873 | — | — | — | — | — | 232 | 51 | — | — | 143 | 122 | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 894 | 0 | 157 | 204 | 884 | 1215 | 1348 | 153 | 0 | 151 | 153 | 152 | 152 | 126 | 0 | 152 | 905 | 1373 | 1733 | 152 |
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.










