Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 am 22 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 22 Aug 2026:

  • Best quality surf: Thursday 27 Aug, 6PM (local time) - 11ft (3.5m), 18s period, SW swell with cross-offshore winds.
  • Most powerful swell: Thursday 27 Aug, 3PM (local time) - 10ft (3.0m), 19s period, SW swell with 7,275 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 6PM (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 6PM. The primary swell is predicted to be 2.5m and 15s period with a secondary swell of 1.0m and 20s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Flatrock in the next 16 days are 3.0m 19s and forecast to arrive on Thursday (Aug 27) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Monday (Aug 24) at 6PM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Sat 22nd Aug)8ft (2.5m) 15s
Best Surf 6PM (Thu 27th Aug)11ft (3.5m) 18s
Most Powerful 3PM (Thu 27th Aug)10ft (3.0m) 19s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what Flatrock has cooking for us over the next couple of weeks. This is a solid, exposed reef break, and the models are showing a run of decent SW groundswell, so we’re not staring at a flat spell. The water temp is sitting at 59°, which is pretty much bang on average for this time of year – no surprises there.

The first few days are a bit of a mixed bag. Saturday the 22nd and Sunday the 23rd have a solid 8ft SW swell rolling in, with a super long 15-16 second period – that’s proper groundswell energy. The combined energy is strong, hitting over 3300 and then 3700. But the wind is messy. Saturday morning is a cross-on with 9 mph from the SW, which is going to leave things a bit choppy. Sunday morning cleans up nicely with a cross-off breeze from the NNE, but the wind picks up to 12 mph. It’s not trash, but it’s not the pick of the window either. The wave comment even says “marginal,” so don’t expect perfection.

Monday the 24th sees the swell drop to 5ft, still a fine 14 second period. The wind switches offshore from the East at 19 mph, which is strong but clean. The energy drops to 1062, so it’ll be weaker, but that offshore wind will make for some clean lines if you’re after a more relaxed session.

The big news starts brewing toward the end of August and into September. Tuesday the 27th of August has a 10ft SW swell with a 19 second period – that’s a very long period groundswell. Combined energy is pumping at 7275. The wind is light and cross-shore from the North at 6 mph. This is a standout morning for experienced surfers. That long period will wrap beautifully around the reef, but be aware that with a period that long, it can get a bit straight at times on a reef. Still, this is a quality window.

Then we get to the true standout. The 5th and 6th of September. Mate, this is the one to circle. Saturday the 5th has a massive 13ft SW swell with a 17-second period, and the combined energy is off the charts at 8826. The wind is offshore – ENE at 12 mph and then light Easterly. The wave comment calls it “exceptional for expert surfers,” and I’m not gonna argue. This is big, powerful, and clean. This is not for beginners – 13ft is expert only. Sunday the 6th stays big at 13ft, but the wind gets a bit more cross-off from the NNE and fresh at 22 mph in the morning, which could make it a bit tricky.

If you’re picking one day, Saturday the 5th of September at Flatrock is the best on offer. Huge swell, clean offshore wind, and massive energy. It doesn’t get much better for the advanced crew.

There will be a bit of a lull in quality around the 2nd, 3rd, and 4th of September where the wind gets messy and the swell drops, but don’t let that put you off – the big stuff is waiting. Crowds are listed as “sometimes,” so you might have company at a spot this good, but on a 13ft day, it’ll thin out.

Right, I’m signing off. Rusty.

Short Range Forecast

Heavy rain (total 22mm), heaviest during Mon morning. Very mild (max 17°C on Sun afternoon, min 11°C on Sun night). Winds increasing (calm on Sat afternoon, fresh winds from the S by Mon night).

Days 4-6 Weather Summary

Mostly dry. Very mild (max 19°C on Thu afternoon, min 11°C on Wed morning). Winds decreasing (fresh winds from the S on Tue morning, calm by Tue night).

Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
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
4
5
4
3
4
3
3
2
5
4
3
3
2
3
3
7
5
5
4
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
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
1.9
SW
17
3
SW
16
3
SW
14
2.1
SW
14
1.8
SW
13
1.5
SW
13
1.4
SW
14
1.5
SW
21
3
SW
19
3
SW
17
2.5
SW
16
2.3
SW
16
2
SW
14
Wave Graph
Metric surfscale
Energy kJ
3178
2919
2383
3721
2726
1446
1002
671
2037
3970
4119
1686
1050
710
833
1946
7275
5794
3263
2484
1602
Wind (km/h)
15
SW
10
W
10
ENE
20
NNE
5
NW
15
E
30
E
15
NE
30
S
35
S
25
SSW
5
SSW
10
N
15
NW
15
NE
25
NNE
10
N
20
ENE
10
NNE
5
SE
15
SE
Wind State
cross-on
on
off
cross-off
cross-on
off
off
cross-off
cross
cross
cross
cross-on
cross
cross-on
cross-off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
High Tide
12:11PM0.37m
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
1:06PM0.57m
1:11AM0.38m
Low Tide
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
6:29AM0.02m
7:35PM0.04m
clear
clear
clear
part cloud
part cloud
mod rain
mod rain
light rain
rain showers
part cloud
cloud
part cloud
clear
clear
clear
clear
clear
part cloud
cloud
part cloud
clear
<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
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:01
6:02
6:02
6:04
6:05
6:05
6:06
 mm
6
9
3
4
Temp °C
13
13
13
15
17
17
12
12
14
14
13
13
12
12
13
17
19
18
16
17
16
Feels °C
11
12
12
11
15
14
8
10
8
7
8
10
8
9
11
12
16
13
14
13
12
  • 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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