Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 am 02 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.5°C
0.7° 

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


Flatrock surf forecast from 1 Sep 2026:

  • Best quality surf: Saturday 5 Sep, 12PM (local time) - 18ft (5.5m), 13s period, SW swell with cross-onshore winds.
  • Most powerful swell: Saturday 5 Sep, 12PM (local time) - 18ft (5.5m), 13s period, SW swell with 10,058 kJ wave energy.
  • Next surfable swell (1★+): Thursday 3 Sep, 9PM (local time) - 11ft (3.5m), 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 Thursday (Sep 03) at 9PM. The primary swell is predicted to be 3.5m and 15s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Flatrock in the next 16 days are 5.5m 13s and forecast to arrive on Saturday (Sep 05) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 7s period and expected on Tuesday (Sep 08) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Thu 3rd Sep)11ft (3.5m) 15s
Best Surf12PM (Sat 5th Sep)18ft (5.5m) 13s
Most Powerful12PM (Sat 5th Sep)18ft (5.5m) 13s

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


The Lowdown

Alright, the wait is over. After a pretty grim start, we’ve got some serious potential lining up for us here at Flatrock. This is an advanced reef setup, exposed to the SW, and it doesn’t break all that often, so when the stars align, you want to be on it. Water temp is sitting at 60°, which is pretty average for this time of year, so nothing out of the ordinary there.

The first few days are a write-off. Wednesday the 2nd is a no-go with strong onshores and messy, dangerous conditions. Thursday and Friday are just as grim, with lumpy cross-chop and winds that are going to make it feel like a washing machine. Saturday the 5th looks genuinely dangerous with a 16ft swell and strong onshore wind – that’s for experts only, and even then, it’s a pass.

Now, here’s where it gets interesting. Sunday morning the 6th is our first real glimmer. We’ve got a clean 10ft SW groundswell with a 14-second period and light cross-offshore wind from the NE. That’s a good combo for this reef, with the combined swell energy sitting at a solid moderate 3740. It’s big enough to be exciting, but still manageable for experienced surfers. Crowds can show up here sometimes, so don’t expect to have it to yourself if the word gets out.

Monday the 7th drops right off in size, down to 3ft to 4ft, but with a very long 21-second period and clean offshore winds. The energy is weak at 816 to 1350, so it’s more of a longboard or funboard kind of day if the tide lines up. Not a standout, but a nice little window if you’re desperate for a paddle.

Tuesday the 8th brings a solid 10ft SW groundswell with a 17-second period, and the wind is clean cross-offshore. Energy is moderate at 4560. Another good session for those with some experience.

Wednesday the 9th is a monster day, but it’s a tough call. We’ve got a 13ft SSW swell with a 17-second period and strong offshore wind. The combined energy is very strong at 18115, and the forecast suggests it might actually be too big and powerful for this break, making it incredibly difficult to paddle into. Only for the absolute top-tier local chargers.

Thursday the 10th backs off slightly to an 12ft SSW swell, still with clean winds and a 16-second period. Energy remains moderate to strong at 6750. This is probably the better bet than Wednesday if you want to actually catch waves.

After that, it goes quiet again. Friday the 11th through Saturday the 12th is messy, onshore, and small. Sunday the 13th shows some promise with a clean 7ft SW groundswell and a 16-second period under light winds, but it’s not a standout.

Then we get to Monday the 14th. Glassy conditions with a 7ft SW swell and a 15-second period. Energy is moderate at 1875. That’s a beautiful morning session for experienced surfers with clean, lined-up waves.

But the real standout, the one you should be marking on your calendar, is Thursday the 17th. We’ve got a massive 13ft SSW swell early in the morning with an 18-second period and light cross-offshore wind. The combined swell energy is very strong at 10418. The afternoon jumps to a 21ft SSW swell, with an energy reading of 30320 – that’s a massive amount of power. The wind is gentle cross-shore. This is an exceptional day for expert surfers only. This is the kind of swell that turns Flatrock into a proper big-wave arena. It’s 16 days out, so keep an eye on the forecasts, but if this holds, it will be the session of the month.

Rusty

Short Range Forecast

Some drizzle, heaviest during Wed night. Very mild (max 18°C on Fri afternoon, min 12°C on Thu night). Winds increasing (calm on Thu night, near gales from the WNW by Fri night).

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Mon afternoon. Very mild (max 15°C on Sun afternoon, min 11°C on Sat night). Winds decreasing (strong winds from the WSW on Sat morning, light winds from the W by Sat night).

Wednesday
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
0
0
0
4
6
3
2
0
0
0
4
5
1
2
2
3
3
4
1
5
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.5
SW
16
3
SW
15
3
SW
14
3
SW
14
3.5
SW
15
3.5
SW
15
3.5
SW
16
3
SW
16
3.5
SW
15
4
SW
14
5
SW
13
3.5
SW
14
3
SW
14
2.3
SW
14
1.8
SW
13
1.1
SW
13
1
SW
21
2.5
SSW
18
3
SW
17
2.4
SW
16
3
SW
16
Wave Graph
Metric surfscale
Energy kJ
3326
3197
3761
4021
5120
5884
5921
4885
5549
5502
9101
4522
3105
2171
1110
437
832
4813
4554
2978
4065
Wind (km/h)
20
W
30
W
35
W
20
SW
15
WSW
15
NE
30
N
35
NNW
55
WNW
40
WSW
25
WSW
10
W
15
NE
20
SW
25
SE
30
E
25
ESE
25
ESE
25
SE
35
SE
45
SE
Wind State
on
on
on
cross-on
cross-on
cross-off
cross
cross
on
cross-on
on
on
cross-off
cross-on
cross-off
off
off
cross-off
cross-off
cross-off
cross-off
High Tide
2:12PM0.35m
3:15AM0.51m
1:57PM0.31m
3:47AM0.47m
1:07PM0.31m
4:29AM0.42m
11:20AM0.44m
11:40AM0.50m
1:53AM0.20m
12:02PM0.53m
00:52AM0.23m
Low Tide
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
8:01PM0.01m
7:45PM0.03m
4:35AM0.18m
7:30PM0.05m
cloud
cloud
light rain
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
cloud
part cloud
clear
part cloud
cloud
cloud
light rain
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:47
6:46
6:43
6:43
6:41
6:39
6:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:09
6:09
6:10
6:12
6:13
6:13
6:14
 mm
1
2
Temp °C
14
14
15
14
14
14
17
18
16
13
13
13
14
15
13
14
13
13
16
15
13
Feels °C
8
8
8
10
11
11
10
12
9
4
7
10
11
11
9
8
8
8
11
9
5
  • Map Icons:
  • Break
  • 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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