Surf Forecasts:
Flatrock surf forecast from 29 Aug 2026:
- Best quality surf: Saturday 5 Sep, 9AM (local time) - 16ft (5.0m), 14s period, SW swell with onshore winds.
- Most powerful swell: Saturday 5 Sep, 9AM (local time) - 16ft (5.0m), 14s period, SW swell with 9,813 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 12AM (local time) - 4.5ft (1.4m), 13s 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 Sunday (Aug 30) at 12AM. The primary swell is predicted to be 1.4m and 13s period with a secondary swell of 0.7m and 21s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 5.0m 14s and forecast to arrive on Saturday (Sep 05) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Sunday (Aug 30) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 30th Aug) | 4.5ft (1.4m) 13s |
| Best Surf | 9AM (Sat 5th Sep) | 16ft (5.0m) 14s |
| Most Powerful | 9AM (Sat 5th Sep) | 16ft (5.0m) 14s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Hey, Rusty here. Flatrock is our only game in town—a reef setup that loves SW groundswell. Water temp's sitting at 59.4°F right now, pretty average for this time of year. Let’s run through what’s coming.
Saturday 29th August afternoon – Small stuff, 4.6ft SW at 13 seconds, cross-off SE breeze keeping it clean. Combined energy’s moderate (820). Not much to get excited about, just a warm-up.
Sunday 30th – Morning brings a tiny 3.0ft SSW groundswell at a juicy 20 seconds, offshore E wind, glassy. Energy’s stepped up to strong (1322). It’s clean but tiny—fine for a longboard or a beginner. Afternoon sees 6.6ft SW at 18 seconds, cross-off ESE wind, clean again, energy strong (2519). Still not firing but getting there.
Monday 31st morning – This is the first standout. 8.2ft SW at 18 seconds, NNE cross-off at 9 mph, offshore influence. Combined energy jumps to very strong (7457). It’s clean, powerful, and raw—classic Flatrock. Only for experts at this size. If you’re up for it, this is the best session of the first week.
After that, things turn ugly. Monday afternoon gets a cross-on NNW breeze, lumpy. Tuesday 1st September through Thursday 3rd are blown out with strong winds and big, messy surf. Swell holds at 5.9ft–9.8ft but onshore or cross-shore winds ruin it. Energy stays strong but conditions are poor. Kite surfers might fancy the cross-shore winds,
Short Range ForecastMostly dry. Very mild (max 19°C on Sat afternoon, min 14°C on Sat night). Winds increasing (calm on Mon afternoon, strong winds from the NNW by Tue morning). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Thu night. Very mild (max 17°C on Fri morning, min 12°C on Tue night). Winds increasing (light winds from the N on Thu night, strong winds from the N by Fri morning). | |||||||||||||||||||
Sat 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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 13 | SW 13 | SW 13 | SSW 18 | SSW 17 | SW 18 | SW 17 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 15 | SW 14 | SW 14 |
Wave Graph  | ||||||||||||||||||||
 kJ | 690 | 585 | 664 | 2519 | 3224 | 4649 | 4393 | 2761 | 1588 | 1839 | 2453 | 4282 | 4306 | 4251 | 2982 | 2774 | 2886 | 3275 | 2541 | 5648 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | cross-off | off | cross-off | cross-on | cross-off | cross | cross-on | cross-on | on | on | on | on | cross-on | cross-off | cross-off | cross-on | on |
High Tide | 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 | 3:47AM0.47m | 1:07PM0.31m | ||||||||
Low Tide | 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 | 9:50AM0.27m | 8:21PM-0.01m | |||||||
 |  | | | | | | |  | |  | | | | |  |  |  | | | |
 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:43 | — | — |
 | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:09 | — | — | 6:10 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 1 | 4 |
Temp °C | 19 | 16 | 17 | 18 | 15 | 17 | 19 | 18 | 17 | 16 | 14 | 13 | 14 | 15 | 15 | 15 | 15 | 17 | 20 | 16 |
Feels °C | 15 | 12 | 15 | 15 | 10 | 14 | 18 | 15 | 8 | 10 | 9 | 7 | 8 | 10 | 12 | 11 | 11 | 8 | 11 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SSW 18 | SSW 17 | SW 18 | SW 17 | SW 16 | SW 15 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 15 | SW 14 | — |
| kJ | 690 | 585 | 658 | 2519 | 3224 | 4649 | 4393 | 2761 | 1588 | 1839 | 2453 | 4282 | 4306 | 4251 | 2982 | 2774 | 2886 | 3275 | 2541 | — |
Swell 2 Height (m) Direction Period (s) | SW 23 | SW 21 | SSW 20 | — | SW 22 | SW 18 | — | — | — | SW 18 | — | — | — | — | — | — | SSW 18 | — | — | — |
| kJ | 130 | 458 | 664 | — | 372 | 2808 | — | — | — | 718 | — | — | — | — | — | — | 943 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNW 5 | WNW 7 | — | — | — | — | — | — | — | — | WNW 7 | SW 14 |
| kJ | — | — | — | — | — | — | — | — | 90 | 244 | — | — | — | — | — | — | — | — | 276 | 5648 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 74 | 0 | 0 | 78 | 0 | 0 | 74 | 44 | 1250 | 164 | 698 | 162 | 692 | 360 | 360 | 153 | 0 | 204 | 318 | 881 |
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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