Surf Forecasts:
Flatrock surf forecast from 25 Aug 2026:
- Best quality surf: Monday 31 Aug, 12AM (local time) - 10ft (3.0m), 18s period, SSW swell with offshore winds.
- Most powerful swell: Monday 31 Aug, 12AM (local time) - 10ft (3.0m), 18s period, SSW swell with 5,032 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 9PM (local time) - 4.5ft (1.4m), 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 Wednesday (Aug 26) at 9PM. The primary swell is predicted to be 1.4m and 15s period with a secondary swell of 0.1m and 24s. 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 3.0m 18s and forecast to arrive on Monday (Aug 31) at 12AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Sunday (Aug 30) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 26th Aug) | 4.5ft (1.4m) 15s |
| Best Surf | 12AM (Mon 31st Aug) | 10ft (3.0m) 18s |
| Most Powerful | 12AM (Mon 31st Aug) | 10ft (3.0m) 18s |
Table - best surf conditions forecast for Flatrock over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get into it. The surf window is looking a bit bumpy, but there are some real gems if you can pick the right moment.
We're starting off with a bit of a grim scene. For the first few days, Flatrock is getting hammered. That Tuesday the 25th has a solid 10ft SW swell but the wind is a messy cross-on from the SSW at 15 mph, making for poor, choppy conditions. The water temp is a pretty standard 59°F for this time of year, so nothing weird going on there.
The next couple of days, Wednesday the 26th through Thursday the 27th, are still pretty average. The swell is smaller, around 5ft to 6ft, but the wind is either cross or cross-on, keeping things chopped up and very marginal. It’s not worth paddling out for, unless you just want a battle.
Then the tide turns. Friday the 28th of August is the standout. An 8ft SW groundswell with a solid 16-second period rocks up. This is a long-period groundswell with some grunt. The morning has a clean cross-off breeze from the NNE at 9 mph. The wave energy is strong (3366). But the real magic is the afternoon: a glassy WNW breeze at 3 mph hits with a 8ft SW swell. It's going to be clean and smooth. Because it's over 8ft in the morning, it’s best for experienced surfers.
The weekend is a mixed bag. Saturday the 29th has a clean offshore wind from the ESE, but the swell drops to 4ft to 5ft. It’ll be clean, good for the logs, with moderate energy (972). Sunday the 30th looks excellent again, especially the afternoon. A 7ft SSW groundswell with an 18-second period, a clean offshore breeze from the ESE, and wave energy in the strong range (2734). It'll be a beautiful, lined-up reef wave but those 18-second gaps between sets will have you waiting, and it’s a good paddle out.
Monday the 31st has an 8ft SW swell and a clean morning cross-off, but be aware that the afternoon gets cross-on and choppy. After that, from Tuesday the 1st of September onwards, the wind turns onshore and messy for a solid week. There's a big lull in quality until we get another window. Around Tuesday the 8th, the swell is absolutely pumping – 12ft at 19 seconds – but with a screaming 22 mph cross-on wind, it’s just blown-out junk. It won't be surfable.
The very end of the period, Wednesday the 9th of September, looks like a promising re-start. A 10ft SW swell with a 17-second period, but the wind is still cross-on. The potential is there for the reef to be working if you can find an angle.
So, the one true standout is Friday the 28th of August, the afternoon glass-off. That is the session to lock in. Next best is Sunday the 30th of August. After that, it's a waiting game for a clean day.
Take it easy,
Rusty
Short Range ForecastMostly dry. Very mild (max 19°C on Fri morning, min 11°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Fri afternoon, min 14°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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 14 | SW 13 | SW 13 | SW 14 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 19 | SSW 18 | SSW 18 | SW 17 | SW 16 | SW 16 |
Wave Graph | ||||||||||||||||||||
3936 | 1564 | 1242 | 865 | 833 | 1077 | 2096 | 4570 | 3345 | 2516 | 1505 | 951 | 690 | 464 | 1004 | 2734 | 5032 | 4293 | 2831 | 2610 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-off | cross | cross-on | cross-off | cross-off | glassy | off | off | off | off | off | off | off | cross-off | cross-on | cross-off |
High Tide | 00:38AM0.23m | 12:27PM0.55m | 00:40AM0.28m | 12:47PM0.57m | 00:53AM0.33m | 1:06PM0.57m | 1:11AM0.38m | 1:26PM0.55m | 1:32AM0.43m | 1:44PM0.51m | 1:55AM0.48m | 1:59PM0.46m | 2:20AM0.51m | |||||||
Low Tide | 7:27PM0.08m | 5:25AM0.10m | 7:24PM0.07m | 5:58AM0.06m | 7:28PM0.05m | 6:29AM0.02m | 7:35PM0.04m | 6:59AM0.01m | 7:43PM0.03m | 7:29AM0.01m | 7:53PM0.02m | 7:59AM0.02m | 8:02PM0.01m | |||||||
— | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | |
6:04 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 11 | 12 | 14 | 16 | 18 | 18 | 19 | 19 | 18 | 18 | 18 | 16 | 18 | 19 | 16 | 17 | 19 | 19 |
Feels °C | 8 | 10 | 7 | 9 | 9 | 11 | 14 | 15 | 15 | 17 | 14 | 15 | 15 | 12 | 16 | 17 | 12 | 14 | 17 | 17 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 13 | SW 13 | SW 14 | SW 14 | SW 14 | SW 18 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SSW 18 | SSW 18 | SW 17 | SW 16 | SW 16 |
3936 | 1564 | 1242 | 865 | 833 | 1077 | 1147 | 4570 | 3345 | 2516 | 1505 | 951 | 690 | 464 | 336 | 2734 | 5032 | 4293 | 2831 | 2610 | |
Swell 2 Height (m) Direction Period (s) | — | SSW 13 | SSW 12 | SSW 16 | SSW 23 | SW 21 | SW 19 | — | S 11 | SSE 10 | — | SW 23 | SW 23 | SW 21 | SSW 19 | — | — | — | — | — |
— | 192 | 79 | 175 | 53 | 508 | 2096 | — | 21 | 11 | — | 21 | 130 | 458 | 1004 | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SW 23 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | 82 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 14 | — | — | NNW 3 | — | NNW 4 | — | — | — | — | — | — | — | E 3 | E 4 | — | — | — | — | — |
2541 | — | — | 4 | — | 16 | — | — | — | — | — | — | — | 5 | 11 | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 198 | 42 | 42 | 42 | 44 | 44 | 42 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 89 | 42 | 44 |
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.











