Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.2°C
0.4° 

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


Flatrock surf forecast from 11 Sep 2026:

  • Best quality surf: Wednesday 16 Sep, 3AM (local time) - 10ft (3.0m), 15s period, SSW swell with offshore winds.
  • Most powerful swell: Tuesday 15 Sep, 6AM (local time) - 11ft (3.5m), 15s period, SW swell with 6,533 kJ wave energy.
  • Next surfable swell (1★+): Saturday 12 Sep, 6PM (local time) - 6ft (1.8m), 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 Saturday (Sep 12) at 6PM. The primary swell is predicted to be 1.8m and 16s period. 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 3.5m 15s and forecast to arrive on Tuesday (Sep 15) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Sep 13) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Sat 12th Sep)6ft (1.8m) 16s
Best Surf 3AM (Wed 16th Sep)10ft (3.0m) 15s
Most Powerful 6AM (Tue 15th Sep)11ft (3.5m) 15s

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


The Lowdown

Alright, this is Rusty. Let's have a look at what's cookin' for Flatrock over the next couple of weeks.

Right off the bat, we’ve got a solid pulse of energy rolling in. This isn’t a flukey little bump; there’s some serious grunt behind this southwest groundswell. The first decent window opens up Friday afternoon and that’s where I’d be looking first. Flatrock is a reef setup, so that long-period energy is going to line up nicely.

We're looking at a solid 8ft of swell from the SSW, with a deep 16-second period. The combined energy is pumping at 3062, so there's plenty of power. The wind is a light SSE cross-off, keeping things clean. Water temp is sitting at 59°, which is about normal for this time of year. This is advanced territory though – this spot isn't one for learners, and with that size, it's strictly for the experienced crew.

Saturday sees the swell dropping back a touch to 6ft, but a morning NNE breeze at 12 mph will still offer a clean cross-off. The energy is still moderate at 2171, so it’s a solid follow-up day. Sunday is a write-off with strong onshore winds, so don't bother.

Now, keep an eye on Tuesday the 15th. We see the swell jumping back up to 10ft from the SW with a 15-second period. The combined energy is a meaty 4076. The wind is cross-off from the SSE, so it’ll be clean. This is big, powerful surf – experts only.

The real standout, and I mean the best of the entire run, looks to be Wednesday the 16th. We’ve got a solid 10ft of SSW swell, clean as a whistle with a moderate offshore breeze from the East at 16 mph. The period is a long 15 seconds, and the energy is a massive 3733. This is the kind of day you call in sick for. The wind is blowing off the land, stacking the swell up on that reef. It’s going to be a proper session. After that, Thursday the 17th offers a decent 7ft option, but the wind swings onshore later in the day.

We then hit a lull from the 18th through the 20th. The swell drops below 5ft and the winds turn messy, so it’s a few days of flat or poor conditions.

The following week gets interesting again. Monday the 21st is a no-go – the swell jacks up to a massive 18ft with strong onshore winds. That’s just unsafe. Tuesday the 22nd sees it drop to 13ft, but the wind is cross-shore and messy. However, Wednesday the 23rd of September is another one to circle on the calendar. The swell drops to a still-big 13ft from the SW, but the wind goes offshore from the East again at 12 mph. The combined energy is off the charts at 10007. This is exceptional, high-performance surfing for experts only. The light winds on Wednesday afternoon will have it glassing off.

Right at the tail end, Saturday the 26th looks promising again with an 8ft to 12ft SW groundswell and clean conditions. It’s a long way off, so don’t lock it in, but it’s a good sign the sand might still be holding.

So, to wrap it up: your best bets are this Friday, the 11th of September, for the first solid swell, and next Wednesday, the 16th, for the cleanest, most powerful surf. That Wednesday is the one to chase.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sat night. Warm (max 22°C on Sat afternoon, min 13°C on Sun night). Winds increasing (light winds from the NNW on Sat afternoon, fresh winds from the W by Sun morning).

Days 5-7 Weather Summary

Mostly dry. Very mild (max 16°C on Mon night, min 9°C on Tue night). Winds decreasing (fresh winds from the S on Mon night, calm by Thu afternoon).

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
3
3
2
0
0
0
1
2
2
3
3
3
4
5
5
3
4
2
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
16
1.8
SW
15
1.9
SW
16
1.4
SW
15
1.8
SW
16
1.4
SW
16
1.9
SW
15
1.8
SW
13
1.6
SW
12
2.4
SW
16
3
SW
15
3
SW
14
3
SW
14
3
SSW
15
2.5
SSW
14
2.5
SSW
16
2.1
SSW
14
1.7
SSW
14
1.5
SSW
13
Wave Graph
Metric surfscale
Energy kJ
2694
1436
1806
844
1707
976
1446
1116
712
2905
4187
3912
3768
3733
2765
3116
1700
1126
808
Wind (km/h)
15
NE
20
NNE
10
NNW
30
NNE
35
W
30
W
25
WSW
20
WSW
15
W
30
S
25
SSE
30
SSE
25
ESE
25
E
25
E
20
E
20
NE
5
WSW
20
NNE
Wind State
cross-off
cross-off
cross
cross-off
on
on
on
on
on
cross
cross-off
cross-off
cross-off
off
off
off
cross-off
glassy
cross-off
High Tide
00:57AM0.43m
1:08PM0.47m
1:15AM0.49m
1:19PM0.44m
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
Low Tide
6:58AM0.02m
7:10PM0.04m
7:25AM0.03m
7:15PM0.01m
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
clear
clear
part cloud
rain showers
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:33
6:31
6:30
6:28
6:28
6:26
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:15
6:16
6:16
6:17
6:19
6:20
6:20
 mm
2
Temp °C
18
20
22
21
15
14
14
14
15
16
13
12
11
11
11
11
14
16
17
Feels °C
13
15
18
17
9
8
11
12
12
12
6
5
4
5
5
6
10
14
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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