Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.2°C
0.3° 

Flatrock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Flatrock surf forecast from 30 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) - 16ft (5.0m), 14s period, SW swell with 9,547 kJ wave energy.
  • Next surfable swell (1★+): Monday 31 Aug, 3AM (local time) - 8ft (2.5m), 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 Monday (Aug 31) at 3AM. The primary swell is predicted to be 2.5m and 16s period with a secondary swell of 1.5m and 19s. 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 5.0m 14s and forecast to arrive on Saturday (Sep 05) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Sunday (Sep 06) at 3PM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Mon 31st Aug)8ft (2.5m) 16s
Best Surf 9AM (Mon 31st Aug)8ft (2.5m) 18s
Most Powerful 9AM (Sat 5th Sep)16ft (5.0m) 14s

Table - best surf conditions forecast for Flatrock over the next 16 days.


The Lowdown

G’day, Rusty here, and we’ve got a proper mixed bag coming our way over the next couple of weeks. We start off with a bit of a wait, but when the surf shows, it’s gonna be solid. The first decent window doesn’t really open until Monday the 31st of August – that’s the first real recommendation for a paddle. Up until then, it’s a bit of a non-event, so hold tight.

So, for the main event: Flatrock is our only real option, and it’s a reef break for the advanced crew. Water temp’s sitting at 59.4°, which is about normal for this time of year, no surprises there.

Monday the 31st of August, morning session – this is your standout. We’ve got a clean 8.2 ft swell rolling in from the SW, with a long period of 18 seconds. That’s proper groundswell energy, and the combined energy is pumping at 7457 – strong stuff. Wind is a NE breeze at 9 mph, blowing cross-off, so it’ll be glassy and clean. Crowds are *sometimes* an issue here, so if you can get out early, you’ll have it sweet. The long period means it’ll be better-shaped with more power, but at a beach it can straighten out – being a reef, Flatrock should handle it beautifully. This one’s for the experienced surfers, as 8.2 ft is pushing it for beginners.

After that, the week turns to junk. Tuesday through Saturday are all blown out with strong onshore winds and messy conditions, no scores worth a mention. There’s a solid gap of poor surf here.

Sunday the 6th of September, morning – we get a reprieve. NNE wind at 16 mph cross-off, and a clean 8.2 ft swell from the SW at 14 seconds. Combined energy’s at 2724, moderate. It’s only a marginal call, but if you’re keen, it’s clean. The water’s still around the same temp, no anomaly.

Monday the 7th of September, afternoon – another flicker. Clean conditions again with a SSE breeze at 25 mph cross-off, and a 7.9 ft swell from the SW, but this time the period jumps to 21 seconds – that’s very long period groundswell. Combined energy is huge at 8830. That’s some serious push, and it’ll be hollow and powerful. Expert territory for sure. Crowds could be around.

Tuesday the 8th of September – both morning and afternoon look interesting. The swell holds at 11.5 ft from the SW with a 17 second period. Morning has a S cross-shore breeze at 16 mph, and afternoon goes lighter with a SSW breeze at 9 mph. Combined energy is 7878 and then a massive 10300 in the arvo. That’s strong to very strong energy. The afternoon is the pick here – gentle cross-shore chop, still clean enough for the experts. This is too big for beginners.

Wednesday the 9th of September – still big, but wind goes cross-onshore. Morning is the better call with 11.5 ft swell and 18 second period, gentle cross-onshore breeze. Energy at 8370. It’s marginal but doable for the experienced.

Thursday the 10th of September, morning – now this is a cracker, but only for the very brave. Glassy conditions with a NNE breeze at just 3 mph, and a massive 14.8 ft swell from the SW with a 16 second period. Combined energy is off the charts at 18321 – that’s very strong energy. The forecast says it’s too big for the break, so this is for hardcore experts only. If you’re not on a gun and you don’t know the reef, stay on the beach.

Saturday the 12th of September, morning – glassy again, ESE breeze at 3 mph, with a 8.2 ft swell from the SW at 16 seconds. Combined energy 4375. This is excellent for experienced surfers, clean and powerful. Crowds possible.

Sunday the 13th of September, morning – another standout. Clean cross-off wind from the NE at 9 mph, 11.5 ft swell from the SW at 17 seconds. Combined energy 6625. This is exceptional for experts – long period, strong energy, clean faces.

Monday the 14th of September – it all goes a bit wild again. Morning has a fresh cross-shore wind, and the swell jumps to 13.1 ft – too messy and big. The afternoon sees 16.4 ft from the SW at 14 seconds, with a NW cross-onshore wind at 22 mph. Combined energy hits 15657, but it’s lumpy and blown out – only for the kamikaze crew.

So, to sum it up: your best bets are Monday the 31st of August morning for a solid, clean session, and Sunday the 13th of September morning for that exceptional clean power. Everything else in

Short Range Forecast

Mostly 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).

Days 5-7 Weather Summary

Light rain (total 6mm), mostly falling on Fri morning. Very mild (max 18°C on Fri afternoon, min 12°C on Fri night). Winds increasing (light winds from the NNW on Thu night, near gales from the WNW by Fri night).

Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
5
8
4
3
0
0
0
1
0
0
0
2
5
0
0
0
0
0
6
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.3
SW
17
2.5
SW
18
2.5
SW
17
2.4
SW
16
1.9
SW
15
1.5
SW
15
2.2
SW
16
2.4
SW
15
2.5
SW
14
4
SW
14
3
SW
14
3.5
SW
14
3.5
SW
15
3.5
SW
15
3
SW
15
3.5
SW
15
5
SW
14
3.5
SW
15
3.5
SW
14
Wave Graph
Metric surfscale
Energy kJ
3003
4649
4138
2761
1588
953
2325
2697
2670
5571
3570
4436
5224
4621
4427
4875
9547
5916
4189
Wind (km/h)
15
E
15
NNE
10
NW
25
NNE
45
NNW
30
WNW
25
SW
20
W
30
W
30
WNW
25
WSW
15
WNW
15
NNE
35
N
40
NW
50
WSW
30
WSW
20
WSW
15
N
Wind State
off
cross-off
cross-on
cross-off
cross-on
on
cross-on
on
on
on
on
cross-on
cross-off
cross
cross-on
on
cross-on
on
cross
High Tide
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
4:29AM0.42m
Low Tide
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
9:26AM0.36m
8:15PM-0.00m
clear
clear
clear
clear
cloud
part cloud
cloud
cloud
cloud
cloud
rain showers
part cloud
part cloud
light rain
clear
part cloud
cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:50
6:48
6:47
6:46
6:43
6:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:07
6:07
6:08
6:09
6:09
6:10
6:12
 mm
2
4
Temp °C
15
17
19
18
17
16
14
13
14
15
14
15
14
16
18
15
13
13
13
Feels °C
10
14
17
12
8
11
9
8
8
9
10
12
12
9
11
5
7
8
11
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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