Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 13 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.3°C
0.5° 

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


Flatrock surf forecast from 13 Sep 2026:

  • Best quality surf: Wednesday 16 Sep, 9AM (local time) - 10ft (3.0m), 15s period, SSW swell with offshore winds.
  • Most powerful swell: Sunday 20 Sep, 6PM (local time) - 13ft (4.0m), 13s period, SW swell with 5,432 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 16 Sep, 9AM (local time) - 10ft (3.0m), 15s period with SSW 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 (Sep 16) at 9AM. The primary swell is predicted to be 3.0m and 15s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Flatrock in the next 16 days are 4.0m 13s and forecast to arrive on Sunday (Sep 20) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Saturday (Sep 19) at 9AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Wed 16th Sep)10ft (3.0m) 15s
Best Surf 9AM (Wed 16th Sep)10ft (3.0m) 15s
Most Powerful 6PM (Sun 20th Sep)13ft (4.0m) 13s

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


The Lowdown

Alright, let's break down what Flatrock has in store for us. The next couple of weeks are a proper mixed bag, with some real quality on the horizon if you're willing to wait and pick your moments. There's a bit of a slow start, but the swell machine gets fired up eventually.

The early part of the run is pretty average. Sunday afternoon kicks things off with a clean 5ft SW groundswell, but a stiff 19 mph onshore west wind makes it a write-off. The water temp is sitting at 60°, which is pretty much what you'd expect for this time of year, nothing weird there.

Monday stays marginal with onshore WSW winds and a building 6ft SW swell, but the conditions just aren't there. Then Tuesday sees the size jump to 10ft from the SW, with a long 15-second period and a cross-offshore wind from the SSE. That's a lot of water moving, and while the wind is clean, this is getting into the "experts only" zone for sure. The wave energy is very strong (3665).

Now, Wednesday the 16th is where it starts to get interesting. The morning session at Flatrock is the first real standout. You've got a solid 10ft SSW groundswell with a very long 15-second period, and a clean offshore breeze from the ESE at 16 mph. The combined energy is pumping at (4257). This is a proper, powerful reef break swell, but the period is so long it might wall up and race. For the crew that knows this place, this is the call. It's a heavy wave, though – this is advanced territory, and crowds are sometimes a thing here.

The rest of that week is a bit of a rollercoaster. Thursday morning drops to 7ft but stays clean with a cross-offshore wind, still good for experienced surfers. But then things get messy again through the weekend with strong winds and lumpy seas, even as the swell size fluctuates.

Looking further ahead, Monday the 28th morning shapes up as another serious highlight, if you can wait that long. We're looking at a huge 13ft SSW swell with a 16-second period. The real kicker is a gentle offshore breeze from the ENE. The numbers on the combined energy are massive (7339). This is big, powerful, and clean. But at 13ft, this is strictly for the top-tier crew at Flatrock. It's a promising call, but it's a long way out, so keep an eye on it.

All up, there are two proper windows: the morning of the 16th, and then the morning of the 28th. The rest is a lot of wind-affected or just plain blown-out surf. There are big gaps of nothing between those standout sessions.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 15°C on Mon afternoon, min 9°C on Tue night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Sat afternoon, min 9°C on Wed night). Winds increasing (light winds from the NNW on Fri afternoon, fresh winds from the N by Sat morning).

Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
0
3
3
3
4
5
4
5
3
3
3
1
0
1
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
SW
15
1.7
SW
13
1.6
SW
12
2.5
SW
16
3
SW
15
3
SW
14
3
SW
15
3
SSW
15
3
SSW
15
2.5
SSW
15
2.2
SSW
14
1.8
SSW
14
1.5
SSW
13
1.5
SSW
18
1.3
SSW
16
1
SW
14
0.9
SW
13
1.7
W
8
2.4
SW
12
Wave Graph
Metric surfscale
Energy kJ
757
1021
736
3211
3918
3710
3873
4201
4222
3241
1906
1222
722
1415
843
412
261
350
1655
Wind (km/h)
20
WSW
20
WSW
20
WSW
30
S
30
SSE
30
SSE
25
ESE
25
ESE
25
SE
20
E
15
NE
10
WSW
15
NNE
30
N
20
NW
20
NE
35
N
25
NNW
30
W
Wind State
on
on
cross-on
cross
cross-off
cross-off
cross-off
off
cross-off
off
cross-off
on
cross-off
cross
cross-on
cross-off
cross
cross-on
on
High Tide
1:36AM0.53m
1:28PM0.41m
1:58AM0.55m
1:35PM0.38m
2:21AM0.55m
1:40PM0.36m
2:44AM0.52m
1:41PM0.34m
3:08AM0.48m
1:32PM0.33m
3:32AM0.43m
1:00PM0.33m
Low Tide
7:50AM0.05m
7:25PM-0.02m
8:13AM0.08m
7:36PM-0.03m
8:33AM0.13m
7:49PM-0.03m
8:52AM0.17m
8:02PM-0.02m
9:06AM0.22m
8:11PM0.00m
9:08AM0.28m
8:12PM0.03m
part cloud
cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:30
6:28
6:28
6:26
6:24
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:16
6:17
6:19
6:20
6:20
6:21
6:22
 mm
Temp °C
14
13
15
15
12
12
10
12
12
11
13
14
15
18
20
21
23
26
25
Feels °C
11
10
11
11
6
5
4
7
7
7
10
12
12
11
17
16
16
19
18
  • 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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