Surf Forecasts:
Flatrock surf forecast from 2 Sep 2026:
- Best quality surf: Thursday 3 Sep, 9PM (local time) - 11ft (3.5m), 15s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 13ft (4.0m), 20s period, SSW swell with 11,678 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 20s and forecast to arrive on Wednesday (Sep 09) at 12PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Wednesday (Sep 09) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 3rd Sep) | 11ft (3.5m) 15s |
| Best Surf | 9PM (Thu 3rd Sep) | 11ft (3.5m) 15s |
| Most Powerful | 12PM (Wed 9th Sep) | 13ft (4.0m) 20s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, let’s break down what Flatrock’s got in store. Water temp’s about 60°F, pretty much normal for now.
We’re startin’ off rough. Thursday the 3rd is a complete washout with onshore slop and rain. Don’t even think about it.
Friday the 4th morning is the first real chance. There’s a solid 10ft SW groundswell with a long 16-second period, and a clean cross-offshore breeze. The energy is massive (5722). This is serious, powerful surf. The afternoon gets wrecked by a strong onshore wind. Saturday the 5th is a total bust with howlin’ onshore gales.
Sunday the 6th morning is a beauty. Clean conditions again with a light offshore breeze and a 10ft SW swell (3521). That’s excellent, powerful stuff for the experienced crew. Monday the 7th drops off in size.
Now, the real standout is Tuesday morning the 8th. Classic Flatrock: an 8ft SW groundswell with a very long 17-second period, and clean offshore wind (4065). This is the day to circle on the calendar. Wednesday the 9th goes huge. A 12ft SW swell with a 21-second period (11021). That’s an enormous amount of energy, but with strong offshore winds, gettin’ out the back is a mission. This is for experts only. The afternoon cleans up a bit.
After that peak, the swell hangs around but the winds get stronger through Thursday the 10th and Friday the 11th. Saturday the 12th and Sunday the 13th are back to poor, onshore conditions with a strong onshore flow. Monday the 14th is just so-so.
Lookin’ further out, Tuesday the 15th and Wednesday the 16th show some hope. Wednesday afternoon the 16th is a real treat – glassy conditions, 7ft of SW swell (1891). That’s about as perfect as it gets. Then it looks like another patch of messy wind to finish things off.
So, the absolute best on offer is Tuesday morning the 8th. The combination of a long-period groundswell, clean offshore wind, and that 8ft swell is the full package. The Wednesday the 9th morning is a close second for the brave.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Fri morning. Very mild (max 18°C on Fri morning, min 12°C on Thu night). Winds increasing (calm on Thu night, strong winds from the W by Fri night). | Days 4-6 Weather SummarySome drizzle, heaviest during Tue afternoon. Very mild (max 14°C on Mon morning, min 11°C on Mon night). Winds increasing (light winds from the NNW on Sun morning, fresh winds from the ESE by Tue night). | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 14 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 13 | SSW 18 | SW 17 | SW 16 | SSW 16 | SW 21 | SSW 19 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3859 | 4890 | 5962 | 5722 | 4645 | 2978 | 5713 | 7245 | 3981 | 2982 | 2201 | 1200 | 690 | 950 | 4676 | 4065 | 3238 | 3035 | 10936 | 10763 | 7350 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-off | cross-off | cross-on | on | on | on | on | cross-off | cross | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | off | off | off |
High Tide | 1:57PM0.31m | 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 | ||||||||||
 |  |  | | | |  |  |  | | | | | | | |  |  | | |  | |
 | 6:46 | — | — | 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 | 1 | — | 2 | 3 | — | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 14 | 14 | 13 | 18 | 18 | 16 | 13 | 13 | 13 | 12 | 13 | 13 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 13 | 11 |
Feels °C | 10 | 11 | 12 | 14 | 13 | 10 | 3 | 7 | 9 | 9 | 10 | 9 | 9 | 8 | 9 | 10 | 7 | 7 | 4 | 6 | 3 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | — | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 13 | SSW 18 | SW 17 | SW 16 | SSW 16 | SW 21 | SSW 19 | SSW 18 |
| kJ | 3859 | 4890 | 5962 | 5722 | 4645 | 2978 | — | 7245 | 3981 | 2982 | 2201 | 1200 | 690 | 950 | 4676 | 4065 | 3238 | 3035 | 10936 | 10763 | 7350 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | WSW 16 | — | SW 23 | SW 21 | SW 20 | SW 13 | — | — | SW 26 | — | — | SSW 22 |
| kJ | — | — | — | — | — | — | — | — | — | 539 | — | 20 | 222 | 792 | 734 | — | — | 27 | — | — | 1589 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 21 | S 9 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 282 | 7 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 5 | W 6 | SW 14 | SW 14 | — | — | — | — | SSE 4 | SSE 6 | SE 6 | — | ESE 5 | SE 6 | SE 6 | ESE 6 | ESE 6 |
| kJ | — | — | — | — | 31 | 293 | 5713 | 4697 | — | — | — | — | 31 | 111 | 266 | — | 23 | 145 | 85 | 215 | 281 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 189 | 316 | 0 | 316 | 204 | 881 | 1120 | 1351 | 89 | 0 | 151 | 152 | 126 | 152 | 152 | 0 | 152 | 1341 | 1373 | 1818 | 871 |
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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