Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 am 26 Aug 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.0°C
0.0° 

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


Flatrock surf forecast from 25 Aug 2026:

  • Best quality surf: Thursday 27 Aug, 9PM (local time) - 8ft (2.5m), 18s period, SW swell with cross-offshore winds.
  • Most powerful swell: Friday 28 Aug, 12AM (local time) - 10ft (3.0m), 18s period, SW swell with 4,570 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 26 Aug, 9PM (local time) - 4.5ft (1.4m), 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 Wednesday (Aug 26) at 9PM. The primary swell is predicted to be 1.4m and 15s period with a secondary swell of 0.1m and 24s. 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 3.0m 18s and forecast to arrive on Friday (Aug 28) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Sunday (Aug 30) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Wed 26th Aug)4.5ft (1.4m) 15s
Best Surf 9PM (Thu 27th Aug)8ft (2.5m) 18s
Most Powerful12AM (Fri 28th Aug)10ft (3.0m) 18s

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


The Lowdown

Alright, Rusty here. Let’s talk about what’s coming up for Flatrock.

Honestly, the next few days are a bit of a write-off for a good paddle. We’ve got swell, but the wind is all over the place, chewing things up. The first real standout doesn’t kick in until Friday the 28th of August. For a few days before that, the conditions are just marginal – cross-shore winds and chop making it a messy affair.

The best bet by a long shot is Friday the 28th of August. The morning session is where it’s at. We’re looking at a solid 8ft SW groundswell, with a period of 16 seconds. That’s proper energy, and the combined swell energy is right up there (3366). The wind is a light cross-offshore breeze, so the surface is going to be clean. This is a reef break, so that long-period groundswell will wrap in nicely. It’s heavy though – at 8ft, this is for experienced surfers only. The afternoon goes glassy with a 8ft SW swell, but the tide might be more of a factor.

Saturday the 29th is a step down in size, but the morning offers a clean 5ft SW swell with light offshore wind from the east. The combined energy is moderate (973). It’s a good option for a more relaxed paddle, but the swell isn’t as powerful.

We get a bit of a lull with onshore winds and choppy conditions from the 1st through the 4th of September. The swell is there, but the wind is mostly onshore or cross-onshore, making it choppy and messy.

Then, towards the end of the run, we get another big pulse. Tuesday the 8th of September is looking special. The morning is glassy – dead calm, not a breath of wind – with a 10ft SW groundswell (16 second period). That’s a massive, powerful swell (combined energy 4396). This is epic, big-wave territory for experts only. The conditions will be pristine, but you need to know what you’re doing. The swell is very long period, so at Flatrock’s reef, it’s going to be a proper, powerful, and clean wave.

The 9th of September keeps the 10ft SSW swell coming, but with onshore wind, it’s not as clean. There’s a huge amount of energy in the water (7201) for the morning, but the wind is a letdown. The 10th drops a little in size to 8ft SSW, but still with onshore wind.

So, to wrap it up: the absolute standout is Friday the 28th of August morning. The second big highlight is the glassy morning of Tuesday the 8th of September. Both are for experienced surfers. Flatrock is fairly consistent, so when the wind lines up, it delivers.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 20°C on Fri morning, min 12°C on Wed morning). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 19°C on Mon afternoon, min 13°C on Sat night). Winds increasing (light winds from the SSE on Sat morning, fresh winds from the N by Mon night).

Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
2
2
1
3
5
5
4
4
4
2
4
4
3
5
4
3
3
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)
1.9
SW
13
1.6
SW
13
1.4
SW
14
1.6
SW
14
1.7
SW
19
3
SW
18
2.5
SW
16
2.3
SW
16
1.9
SW
14
1.6
SW
14
1.5
SW
13
1.4
SW
13
1
SW
20
2
SSW
18
2.3
SW
17
2.5
SW
18
2.5
SW
17
2.3
SW
16
1.8
SW
16
1.6
SW
15
1.8
SW
16
Wave Graph
Metric surfscale
Energy kJ
1242
865
833
1077
2096
4570
3525
2668
1505
1033
769
576
746
2490
2933
3796
3668
2610
1532
1076
1532
Wind (km/h)
15
N
15
NW
15
NE
25
N
15
NNW
15
NE
10
NNE
5
SW
10
E
10
E
20
SSE
15
ESE
15
E
15
SE
10
ENE
20
NNE
15
NW
25
NNE
40
NNW
30
NW
25
WSW
Wind State
cross
cross-on
cross-off
cross
cross-on
cross-off
cross-off
glassy
off
off
cross-off
off
off
cross-off
off
cross-off
cross-on
cross-off
cross
cross-on
cross-on
High Tide
12:27PM0.55m
00:40AM0.28m
12:47PM0.57m
00:53AM0.33m
1:06PM0.57m
1:11AM0.38m
1:26PM0.55m
1:32AM0.43m
1:44PM0.51m
1:55AM0.48m
1:59PM0.46m
2:20AM0.51m
2:10PM0.40m
2:46AM0.52m
Low Tide
7:24PM0.07m
5:58AM0.06m
7:28PM0.05m
6:29AM0.02m
7:35PM0.04m
6:59AM0.01m
7:43PM0.03m
7:29AM0.01m
7:53PM0.02m
7:59AM0.02m
8:02PM0.01m
8:29AM0.06m
8:11PM0.00m
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:56
6:54
6:54
6:52
6:50
6:50
6:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:05
6:05
6:06
6:07
6:07
6:07
6:08
 mm
3
Temp °C
12
12
13
15
18
18
20
19
19
17
18
15
16
17
15
17
19
19
18
18
15
Feels °C
8
9
8
10
16
15
17
17
16
15
14
12
13
13
10
13
15
15
9
12
13
  • 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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