Surf Forecasts:
Flatrock surf forecast from 29 Aug 2026:
- Best quality surf: Monday 31 Aug, 9AM (local time) - 8ft (2.5m), 18s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 5 Sep, 9AM (local time) - 15ft (4.5m), 14s period, SW swell with 7,629 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 12PM (local time) - 5ft (1.5m), 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 Saturday (Aug 29) at 12PM. The primary swell is predicted to be 1.5m and 13s period with a secondary swell of 0.2m and 23s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Flatrock in the next 16 days are 4.5m 14s and forecast to arrive on Saturday (Sep 05) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Sat 29th Aug) | 5ft (1.5m) 13s |
| Best Surf | 9AM (Mon 31st Aug) | 8ft (2.5m) 18s |
| Most Powerful | 9AM (Sat 5th Sep) | 15ft (4.5m) 14s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, let’s take a look at what we’ve got coming up for Flatrock. We’ve got a really tidy, promising start to the weekend with clean conditions, but then the wheels fall off for a long stretch. Hold on, ’cause it’s a bumpy ride before things might settle again way down the track.
The first real standout is Saturday morning the 29th. Flatrock is showing a solid 5ft SW swell with a nice 14-second period behind it. That’s some proper groundswell energy, and with an easterly offshore breeze holding at 9 mph, it’ll be glassy and clean. The combined swell energy is moderate at 972, but the quality is what counts here – it’s going to be a good session for the advanced crew. That afternoon it drops a bit to 5ft, still clean, but the tide might get a little funky.
Sunday morning the 30th keeps the fun going. 5ft from the SSW, period down a touch to 13 seconds, but the combined energy jumps up to 1401 – you’ll feel that. Still offshore from the east, so expect clean, well-shaped waves. This is about as good as it gets for the first few days. Perfect for experienced surfers.
Now, Monday the 31st is the real highlight of this whole window. Morning session brings a 8ft SW swell with a super long 18-second period – that’s proper energy, and the combined swell energy is a ripping 7457. Offshore northeast breeze around 9 mph, so the reef will be holding shape beautifully. This is one for the experts only – 8ft is big, and that long period will make it even more powerful. If you’re confident, get out there early.
After Monday, things turn ugly. Tuesday the 1st into Wednesday and Thursday, we get hammered by onshore winds and lumpy, messy conditions. It stays poor through the whole first week of September. Even when the swell stays big – 8ft to 10ft – it’s blown out, with strong cross-onshore winds. Not worth paddling out. A few days are just total write-offs.
The second week doesn’t offer much relief. The wind stays strong or cross-onshore through to about the 7th, when the swell gets immense – up to 16ft and 18ft – but it’s just too big for Flatrock, with near gale winds. Not a paddle session.
Things may start to come back around Tuesday the 8th and Wednesday the 9th. Swell drops to 13ft Tuesday afternoon with clean SSE cross-offshore 9 mph winds – combined energy still massive at 12077. That’s only for the brave or the experienced, given how big it is. The pulse is still there on Wednesday morning, 12ft with a cross-shore and a bit of chop.
Thursday the 10th morning stands out as the last real possibility: 10ft SW swell, 15-second period, clean with a cross-off northerly breeze at 9 mph. Excellent conditions again for those who can handle it. After that, it’s back to onshore junk and lumpy seas, right through to the 13th.
So, in short: Saturday 29th to Monday 31st is your window. Monday morning the 31st is the pick of the whole outlook – that 8ft with 18 seconds and offshore wind is going to be magic at this reef. The gap after that is huge – basically from Tuesday through to the following Thursday, the 10th, there’s very little worth chasing, and that Thursday is only for the big-wave chargers. Get it while you can.
Water temp at Flatrock is sitting at 59°, which is bang on average for the time of year – no need for a thick suit, but a 3/2 will do you fine.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sat afternoon, min 14°C on Sun morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Tue morning, min 12°C on Tue night). Winds decreasing (strong winds from the NNW on Tue morning, light winds from the WNW by Thu afternoon). | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
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 13 | SW 13 | SSW 13 | SSW 18 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 17 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 15 |
Wave Graph | |||||||||||||||||||||
951 | 690 | 519 | 737 | 2519 | 3003 | 4649 | 4138 | 2761 | 1738 | 1818 | 2208 | 1860 | 3178 | 5265 | 2862 | 2898 | 2323 | 2544 | 3294 | 6215 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | cross-off | off | cross-off | cross-on | cross-off | cross | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-off | cross-on | cross-on | cross-on |
High Tide | 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 | 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 | ||||||||
6:52 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 |
Temp °C | 18 | 19 | 17 | 17 | 17 | 15 | 17 | 19 | 18 | 19 | 18 | 14 | 13 | 14 | 14 | 15 | 15 | 14 | 18 | 17 | 15 |
Feels °C | 16 | 15 | 14 | 15 | 13 | 11 | 14 | 16 | 15 | 10 | 11 | 9 | 9 | 8 | 8 | 11 | 10 | 11 | 12 | 13 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SSW 13 | SSW 18 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 17 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | — |
951 | 690 | 519 | 737 | 2519 | 3003 | 4649 | 4138 | 2761 | 1738 | 1818 | 2208 | 1860 | 3178 | 5265 | 2862 | 2898 | 2323 | 2544 | 3294 | — | |
Swell 2 Height (m) Direction Period (s) | SW 23 | SW 23 | SW 21 | SSW 20 | — | SW 22 | SW 18 | — | — | — | SW 18 | WNW 7 | — | — | — | — | — | — | — | SSW 16 | — |
21 | 130 | 458 | 664 | — | 372 | 2808 | — | — | — | 702 | 91 | — | — | — | — | — | — | — | 667 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NNW 5 | WNW 6 | — | SW 6 | — | SW 14 | — | — | — | — | SW 14 | SW 15 |
— | — | — | — | — | — | — | — | — | 77 | 215 | — | 85 | — | 3419 | — | — | — | — | 2509 | 6215 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 89 | 0 | 0 | 74 | 0 | 0 | 74 | 44 | 624 | 692 | 316 | 742 | 162 | 692 | 162 | 162 | 74 | 204 | 151 | 692 |
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.











