Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.4°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 8 Sep 2026:

  • Best quality surf: Thursday 10 Sep, 6AM (local time) - 11ft (3.5m), 16s period, SSW swell with offshore winds.
  • Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,366 kJ wave energy.
  • Next surfable swell (1★+): Thursday 10 Sep, 6AM (local time) - 11ft (3.5m), 16s 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 Thursday (Sep 10) at 6AM. The primary swell is predicted to be 3.5m and 16s 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 19s and forecast to arrive on Wednesday (Sep 09) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Thursday (Sep 10) at 12PM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Thu 10th Sep)11ft (3.5m) 16s
Best Surf 6AM (Thu 10th Sep)11ft (3.5m) 16s
Most Powerful 9AM (Wed 9th Sep)13ft (4.0m) 19s

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


The Lowdown

Right, grab your wettie, let’s have a look at what’s coming down the line for Flatrock over the next couple of weeks. This is a solid, exposed reef set-up that likes a good SSW to SW groundswell, and let me tell you, it’s about to get a proper hammering. The whole period is dominated by a big, long-period south-west swell train. The water temp is about average for this time of year, no weird anomalies to worry about.

We kick off straight away. Wednesday the 9th looks insane – we’re talking a 13ft SSW groundswell with a very long 19-second period. The combined energy is absolutely pumping at (10691). It’s serious power. The wind is a cross-off from the SE up around 25 mph, so it’ll be clean but with some serious welly behind it. This is big, powerful, expert-only territory. Thursday the 10th has a bit less size, 12ft dropping to 10ft, but still that strong 16-second period. The wind goes offshore from the East at 16 mph. That’s proper clean. The morning on the 10th has a marginal note on the tide, but the afternoon is flagged as excellent for experienced surfers. This is the standout window. Get on it if you’ve got the stones.

Friday the 11th holds in at 8ft to 8ft, still with a long 15 to 16-second period. Offshore East wind holds, 9 to 12 mph. It’s still big and clean, but for the advanced crew. Saturday the 12th starts to drop to 6ft, but the wind goes funky – cross-off in the morning, but cross-on by the afternoon from the NW. Conditions get a bit chopped out.

We hit a flat spell from Sunday the 13th through Monday the 14th. Small 4ft to 5ft leftovers with poor wind. It’s a lull. Wait it out.

Then it picks up again on Tuesday the 15th. A new 8ft SSW swell with a 14-second period rolls in. The morning has a clean offshore breeze from the ESE at 12 mph, and the combined energy is a solid (3023). This is your next good window – clean, powerful, and a proper step down from the monster stuff. That morning session is the one to aim for.

The week after that gets a bit messy and inconsistent, but the big dog returns. Sunday the 20th afternoon shows another solid pulse: 10ft SW, 14 seconds, combined energy at (3680), clean with a light NNE cross-off. That’s a sneaky good session.

Now, looking way out to Monday the 21st, the models have another massive 13ft SW swell with an 18-second period, and combined energy over 9000 (9159). It’s huge. The morning looks okay with a cross-shore wind, but that afternoon and into Tuesday the 22nd gets wrecked by strong onshore and cross-onshore winds. It’ll be a churned-up mess for most, maybe a kite surfer’s dream. Wednesday the 23rd is interesting – still 13ft, but the wind goes light and cross-on. The energy is massive (8382) but the surface might just be rideable if you’re an absolute animal.

Overall, your best bets are the Thursday and Friday of this week for the big, clean stuff, and then the morning of Tuesday the 15th for the next clean pulse. The last few days of the window are too far out to call with any certainty, but there’s potential for another big swell.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 17°C on Fri afternoon, min 10°C on Wed night). Winds decreasing (strong winds from the SSE on Tue night, light winds from the E by Fri afternoon).

Days 5-7 Weather Summary

Mostly dry. Warm (max 23°C on Sat night, min 14°C on Sun night). Wind will be generally light.

Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
6
7
7
5
5
4
4
5
3
3
2
3
1
2
0
2
1
3
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
4
SSW
19
4
SSW
17
3.5
SSW
16
3.5
SSW
16
3
SSW
16
2.4
SSW
15
2.3
SSW
15
2.5
SSW
16
2.3
SW
16
1.8
SW
15
1.8
SW
16
1.1
SW
18
1.6
SW
16
1.5
SW
16
1.3
SW
14
1.1
SW
14
0.8
SW
18
1.9
SW
16
Wave Graph
Metric surfscale
Energy kJ
3714
10366
8608
7109
5386
3822
2479
2305
3100
2660
1417
1685
757
1240
1068
746
440
375
1892
Wind (km/h)
40
SSE
40
SE
35
SE
30
ESE
25
E
25
E
25
E
20
ENE
15
E
20
NE
20
N
15
NW
20
NNE
15
NNW
15
W
20
SSW
10
SW
15
SSW
20
SE
Wind State
cross-off
cross-off
cross-off
off
off
off
off
off
off
cross-off
cross-off
cross-on
cross-off
cross-on
on
cross-on
cross-on
cross
cross-off
High Tide
00:52AM0.23m
12:22PM0.55m
00:39AM0.29m
12:41PM0.53m
00:43AM0.36m
12:56PM0.51m
00:57AM0.43m
1:08PM0.47m
1:15AM0.49m
1:19PM0.44m
1:36AM0.53m
1:28PM0.41m
1:58AM0.55m
Low Tide
5:23AM0.12m
7:19PM0.07m
5:58AM0.06m
7:12PM0.07m
6:29AM0.03m
7:09PM0.06m
6:58AM0.02m
7:10PM0.04m
7:25AM0.03m
7:15PM0.01m
7:50AM0.05m
7:25PM-0.02m
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:37
6:35
6:35
6:33
6:31
6:30
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:14
6:15
6:15
6:15
6:16
6:16
6:17
 mm
Temp °C
13
12
12
11
12
13
13
16
17
17
20
22
23
19
17
15
15
15
13
Feels °C
5
4
4
4
6
8
8
12
14
11
15
18
19
15
15
11
14
12
9
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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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