Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
14.9° C
0.1° 

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


Flatrock surf forecast from 21 Aug 2026:

  • Best quality surf: Thursday 27 Aug, 6PM (local time) - 13ft (4.0m), 17s period, WSW swell with onshore winds.
  • Most powerful swell: Thursday 27 Aug, 6PM (local time) - 13ft (4.0m), 17s period, WSW swell with 9,736 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 8ft (2.5m), 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 Saturday (Aug 22) at 9PM. The primary swell is predicted to be 2.5m and 15s period with a secondary swell of 1.4m and 19s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Flatrock in the next 16 days are 4.0m 17s and forecast to arrive on Thursday (Aug 27) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Tuesday (Aug 25) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Sat 22nd Aug)8ft (2.5m) 15s
Best Surf 6PM (Thu 27th Aug)13ft (4.0m) 17s
Most Powerful 6PM (Thu 27th Aug)13ft (4.0m) 17s

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


The Lowdown

G'day, Rusty here. Alright, let’s get into it for the Flatrock region. We’ve got a classic late-winter run of solid SW groundswells coming through, but the wind is going to be the major player here. It’s a reef break that loves a proper SW swell, which we’re getting in spades, but for the most part, the wind is going to be fighting us, making it a real game of picking the right sessions.

The first real window to look at is Sunday, August 23rd. We’ll have a 8ft SW groundswell rolling in with a long 16-second period, and the wind swings around to a clean, cross-offshore from the NNE at 12 mph. The wave energy is in the moderate-to-strong range (3721). That’s going to make for some well-shaped, powerful lines at Flatrock. It’s an advanced wave to start with, so that size and power is for experienced crew only.

Now, for the standout. Keep your eyes locked on Sunday, August 30th afternoon. The wind eases back to a moderate breeze, and we get a clean, cross-offshore flow from the SSE at 16 mph. The swell jumps right up to a chunky 12ft from the SSW with a very long 19-second period, and the combined energy is massive at 8755. This is proper, heavy groundswell. For a reef break like Flatrock, that long period will unload some beautiful, deep barrels for the experts. It’s going to be a big, raw, and incredibly powerful session, but it’s only for the very best. Expect crowds to be a problem here, as it’s a spot that draws a crew when it’s on.

There’s a promising run towards the end of the window, too. Friday, September 4th morning is looking glassy. We have zero wind and a solid 8ft SW swell with a moderate 14-second period and 2670 combined energy. The conditions are described as "excellent." That kind of glassy, clean, overhead reef surf is about as good as it gets. It should be a proper session.

The first week is full of lumpy, cross-onshore winds that will make the big swells messy and challenging. A lot of those days are best left to the kite crew. There’s a long gap of poor conditions from the 23rd to the 30th, with only that Sunday morning session offering a real clean chance before the big one on the 30th.

Keep in mind, the water temp is about average for this time of year.

Stay stoked, check the charts, and I’ll see you out there.

Rusty

Short Range Forecast

Heavy rain (total 29mm), heaviest during Mon morning. Very mild (max 17°C on Sun afternoon, min 11°C on Mon morning). Winds increasing (calm on Sat night, fresh winds from the ENE by Mon morning).

Days 5-7 Weather Summary

Some drizzle, heaviest during Mon night. Very mild (max 17°C on Thu morning, min 11°C on Tue night). Winds decreasing (fresh winds from the SSW on Mon night, calm by Tue night).

Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
3
4
5
4
3
4
4
2
1
5
0
3
3
1
3
2
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)
3
SW
16
3
SW
15
2.5
SW
15
2.4
SW
14
2.5
SW
16
2.4
SW
16
1.9
SW
15
1.6
SW
14
1.4
SW
14
1.5
SSW
13
3
SSW
16
3
SSW
14
2.5
SW
14
1.8
SW
13
1.6
SW
12
1.6
SW
15
1.6
SW
20
3.5
SW
19
4
SW
17
Wave Graph
Metric surfscale
Energy kJ
4084
3330
2919
2383
3721
2726
1446
1002
671
784
4056
3338
2618
1067
748
1011
2047
7523
8543
Wind (km/h)
15
WSW
15
SW
10
WSW
10
NE
20
NNE
10
NNW
15
NE
25
E
30
ENE
30
S
35
SSW
30
SSW
10
SW
10
N
20
NW
20
NNE
35
N
25
WNW
35
SSW
Wind State
on
cross-on
on
cross-off
cross-off
cross-on
cross-off
off
off
cross
cross
cross-on
cross-on
cross
cross-on
cross-off
cross
cross-on
cross
High Tide
5:45AM0.35m
11:40AM0.42m
11:50AM0.47m
1:03AM0.20m
12:07PM0.52m
00:38AM0.23m
12:27PM0.55m
00:40AM0.28m
12:47PM0.57m
00:53AM0.33m
Low Tide
8:29AM0.35m
8:57PM0.06m
8:21PM0.08m
7:44PM0.09m
4:42AM0.16m
7:27PM0.08m
5:25AM0.10m
7:24PM0.07m
5:58AM0.06m
7:28PM0.05m
clear
clear
clear
clear
part cloud
part cloud
light rain
heavy rain
heavy rain
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:00
6:58
6:58
6:56
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:00
6:01
6:02
6:02
6:04
6:05
6:05
 mm
2
16
11
1
6
Temp °C
15
13
13
13
15
17
16
12
12
14
14
13
13
12
13
13
17
16
13
Feels °C
11
11
11
12
12
15
12
6
6
9
7
7
10
8
9
10
11
11
9
  • 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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