Surf Forecasts:
Flatrock surf forecast from 28 Aug 2026:
- Best quality surf: Friday 4 Sep, 9AM (local time) - 15ft (4.5m), 14s period, SW swell with onshore winds.
- Most powerful swell: Friday 4 Sep, 9AM (local time) - 15ft (4.5m), 14s period, SW swell with 7,714 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 12PM (local time) - 8ft (2.4m), 16s 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 Friday (Aug 28) at 12PM. The primary swell is predicted to be 2.4m and 16s period with a secondary swell of 0.2m and 11s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 4.5m 14s and forecast to arrive on Friday (Sep 04) at 9AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Fri 28th Aug) | 8ft (2.4m) 16s |
| Best Surf | 9AM (Fri 4th Sep) | 15ft (4.5m) 14s |
| Most Powerful | 9AM (Fri 4th Sep) | 15ft (4.5m) 14s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, Rusty here again. Only one spot worth talking about for the next 16 days: Flatrock. Reef break for the advanced crew, open to the southwest swell. Water’s sitting at 59°F, which is dead average for the time of year.
Friday morning, August 28, it’s on. Flatrock is seeing 8ft SW groundswell with a long 16-second period and a light cross-offshore breeze from the NE at 6 mph. Combined energy is 3313—strong. This is clean, powerful, expert-only surf. Not for beginners.
Friday afternoon drops a bit—8ft SW, wind goes light onshore from the S at 3 mph, gets a little chopped. Saturday morning, August 29, cleans right up: 5ft SW, 14 seconds, offshore from the E at 9 mph. Energy moderate at 1054. Saturday afternoon, swell drops to 5ft, wind goes cross-offshore—still okay.
Sunday morning, August 30, that’s a gem. Clear, offshore wind 9 mph from the E, and a long-period SSW groundswell at 3ft but with a very long 20-second period. Energy moderate at 1322. Reef will love those long lines. Sunday afternoon kicks up to 7ft SSW, 18 seconds, cross-offshore wind, still clean.
Monday morning, August 31—the standout. Flatrock gets 8ft SW, 18-second period, cross-offshore from the NE at 9 mph. Combined energy is massive at 7346. Exceptional for experts, big and clean. Only for the brave.
After that, wind wrecks things. Monday afternoon through Thursday, September 3, winds crank up to 25 mph from the north and west, swells 5ft to 13ft—blown out or too big. Friday, September 4, morning shows a massive 15ft SW swell with 14-second period and onshore wind—way too big and messy. Weekend of September 5-6 is cross-shore winds and 8ft to 10ft swell—poor.
Monday, September 7, wind finally goes offshore from the E at 22-31 mph, swell drops to 5ft SSW, but the wind is near-gale—clean but near impossible to paddle into. Rest of the week has onshore or cross winds and medium swells. The only maybe is Saturday, September 12, with 12ft SW, 17-second period, and light onshore wind at 9 mph—big energy at 7889 but lumpy from the wind.
Best bet is Monday morning, August 31, for the big clean stuff, and Sunday morning, August 30, for those gorgeous long-period reef waves. The rest is a write-off.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Fri afternoon, min 14°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Mon afternoon, min 13°C on Tue night). Winds increasing (calm on Mon afternoon, strong winds from the NNW by Tue morning). | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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 14 | SW 14 | SW 13 | SW 13 | SW 13 | SSW 18 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3304 | 2516 | 1402 | 1033 | 690 | 519 | 664 | 2547 | 3003 | 4701 | 4138 | 2761 | 1958 | 966 | 1783 | 1761 | 2497 | 1785 | 3009 | 5754 | 6987 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | off | off | cross-off | off | off | cross-off | off | cross-off | cross-on | cross-off | cross | cross-on | cross-on | on | on | cross-on | cross-on | on | cross-on |
High Tide | 1:06PM0.57m | 1:11AM0.38m | 1:26PM0.55m | 1:32AM0.43m | 1:44PM0.51m | 1:55AM0.48m | 1:59PM0.46m | 2:20AM0.51m | 2:10PM0.40m | 2:46AM0.52m | 2:12PM0.35m | 3:15AM0.51m | 1:57PM0.31m | ||||||||
Low Tide | 7:35PM0.04m | 6:59AM0.01m | 7:43PM0.03m | 7:29AM0.01m | 7:53PM0.02m | 7:59AM0.02m | 8:02PM0.01m | 8:29AM0.06m | 8:11PM0.00m | 8:59AM0.12m | 8:18PM-0.00m | 9:27AM0.19m | 8:22PM-0.01m | ||||||||
 | |  |  | | | | | | | | |  | | | | |  | | | | |
 | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — |
 | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:09 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 19 | 18 | 19 | 17 | 17 | 18 | 15 | 17 | 19 | 18 | 19 | 18 | 15 | 14 | 13 | 13 | 14 | 15 | 14 |
Feels °C | 17 | 18 | 15 | 15 | 15 | 13 | 15 | 14 | 10 | 14 | 16 | 14 | 10 | 11 | 12 | 9 | 7 | 10 | 10 | 8 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SSW 18 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | W 7 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 14 |
| kJ | 3304 | 2516 | 1402 | 1033 | 690 | 519 | 658 | 2547 | 3003 | 4701 | 4138 | 2761 | 1958 | 966 | 73 | 1761 | 2497 | 1785 | 3009 | 5754 | 6987 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 10 | SE 9 | SW 23 | SW 23 | SW 21 | SSW 20 | — | SW 22 | SW 18 | — | — | — | SW 18 | WNW 7 | SW 16 | — | — | — | — | — |
| kJ | 9 | 9 | 13 | 21 | 130 | 458 | 664 | — | 372 | 2645 | — | — | — | 808 | 121 | 943 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NNW 5 | NW 6 | SW 16 | WSW 5 | WSW 5 | — | — | SW 14 | SW 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 61 | 147 | 1783 | 25 | 25 | — | — | 3657 | 4627 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 74 | 0 | 0 | 74 | 0 | 0 | 74 | 0 | 0 | 151 | 44 | 884 | 151 | 198 | 189 | 162 | 44 | 162 | 881 | 1215 |
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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