Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.4°C
0.6° 

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


Flatrock surf forecast from 3 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 20s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 20s period, SSW swell with 11,311 kJ wave energy.
  • Next surfable swell (1★+): Sunday 6 Sep, 9AM (local time) - 10ft (3.0m), 14s 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 Sunday (Sep 06) at 9AM. The primary swell is predicted to be 3.0m and 14s period with a secondary swell of 1.0m and 16s. 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 20s 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 1.1m 5s period and expected on Wednesday (Sep 09) at 9PM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Sun 6th Sep)10ft (3.0m) 14s
Best Surf 9AM (Wed 9th Sep)13ft (4.0m) 20s
Most Powerful 9AM (Wed 9th Sep)13ft (4.0m) 20s

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


The Lowdown

Alright folks, ol' Rusty here with a look at what's coming our way. We've got a single spot on the radar for this 16-day window: Flatrock. It's a classic reef setup, exposed to the south-west, and it's going to be a wild ride with some truly massive energy moving through.

The overall pattern is one of big, powerful, and often unruly swells. There's a lot of wind and a lot of water moving around, so we need to pick our moments very carefully. The best window is a good week and a half away.

Let's start with the good stuff. The absolute standout, the one you need to circle on your calendar, is Thursday, September 18th. The morning is looking exceptional. We've got a solid 12ft SSW groundswell, with a long period of 15 seconds, and a light offshore breeze from the ESE. The combined swell energy is pumping at 6818, which is serious. The winds are light, the forecast is calling it "exceptional" for expert surfers, and it's the perfect setup for a reef like this. The crowd profile says "sometimes," so with a bit of luck, you might have it relatively quiet. This is the one I'm frothing on.

The day before that, Wednesday, September 17th, is a bit of a tease. The forecast is for a massive 23ft swell with a period of 18 seconds and a cross-offshore wind. The combined energy is a staggering 37802, which is just insane. The problem is, it's just too big for Flatrock. Even with good wind, that much power on a reef is a recipe for a beating, not a good time. That's a wave for chargers on a big-wave board, not for a standard session.

Now, the earlier part of the forecast is a mixed bag. There's a lot of size, but the wind is often a problem. Sunday morning, September 6th, is a hidden gem. Look at this: 10ft of SW groundswell with a 14-second period, and the wind is completely glassy. 0 mph wind! The combined energy is still a strong 3814. The forecast says "excellent for experienced surfers." This is a serious window of clean, powerful surf. The water temp is about average for the time of year, which is fine.

Tuesday morning, September 8th, is also worth a look. An 8ft SSW groundswell with a very long 17-second period and a clean offshore ESE wind. The energy is 4323, so it's got some punch. That long period will make it a proper groundswell, which on a reef like Flatrock should produce some nice, lined-up walls. Paddling out will be easier with the long gaps between sets.

The rest of the first week is a write-off. Strong winds, onshore, or just messy conditions rule out most of the time. September 10th through 12th have some clean windows but the wind is strong, creating a "fresh offshore and clean" situation that's just hard to paddle into. The swell is there, but it's a battle.

From September 13th to 16th, it's a total washout. Onshore winds and lumpy, choppy conditions make it a no-go. The surf will be poor.

Finally, Saturday, September 19th, the last day of the forecast, is a nice little capper. A 8ft SSW swell with a 13-second period, glassy conditions, and a clean forecast. The energy is a moderate 2048. It's a solid way to wrap up the period, but it's not as powerful as the 18th.

So, to sum it up: the next few days are a write-off unless you're a glutton for punishment. The best bet is the morning of Thursday, September 18th. If you can wait for it, it will be worth it. The morning of Sunday, September 6th is also a very good, clean option with a lot of power. The rest is a lot of hype and wind.

Stay stoked, and I'll see you in the water.

Rusty

Short Range Forecast

Mostly dry. Very mild (max 19°C on Fri morning, min 12°C on Sat morning). Winds decreasing (near gales from the W on Fri night, calm by Sun morning).

Days 4-6 Weather Summary

Mostly dry. Very mild (max 14°C on Mon morning, min 10°C on Tue night). Winds increasing (light winds from the SE on Tue morning, strong winds from the SSE by Tue night).

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
5
0
0
0
0
2
5
3
2
4
3
6
5
2
0
!
6
7
8
9
5
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3.5
SW
16
3.5
SW
16
2.5
SW
15
4
SW
13
3.5
SW
13
3.5
SW
14
3
SW
14
2.5
SW
14
2
SW
13
1.6
SSW
13
1.7
SSW
14
2.5
SW
18
2.5
SW
17
2.5
SW
16
2.5
SW
16
4
SSW
20
4
SSW
18
4
SSW
18
3.5
SSW
16
3.5
SSW
16
2.5
SSW
15
Wave Graph
Metric surfscale
Energy kJ
5921
5069
3308
5014
4512
4766
3419
2570
1367
875
990
4137
4043
3427
3301
11311
10217
9524
7196
5506
3134
Wind (km/h)
20
NNE
25
NW
40
WNW
50
WSW
35
WSW
15
WSW
5
WSW
10
SSW
25
SSE
25
ESE
25
SE
20
ESE
15
SE
25
S
45
SSE
40
SE
40
SE
30
ESE
25
E
25
ESE
25
E
Wind State
cross-off
cross-on
on
on
cross-on
cross-on
glassy
cross
cross-off
off
cross-off
off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
off
off
off
High Tide
1:07PM0.31m
4:29AM0.42m
11:20AM0.44m
11:40AM0.50m
1:53AM0.20m
12:02PM0.53m
00:52AM0.23m
12:22PM0.55m
00:39AM0.29m
12:41PM0.53m
00:43AM0.36m
Low Tide
9:50AM0.27m
8:21PM-0.01m
9:26AM0.36m
8:15PM-0.00m
8:01PM0.01m
7:45PM0.03m
4:35AM0.18m
7:30PM0.05m
5:23AM0.12m
7:19PM0.07m
5:58AM0.06m
7:12PM0.07m
part cloud
cloud
clear
cloud
cloud
cloud
clear
clear
part cloud
clear
clear
part cloud
part cloud
cloud
part cloud
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:43
6:43
6:41
6:39
6:39
6:37
6:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:10
6:12
6:13
6:13
6:14
6:15
6:15
 mm
Temp °C
19
19
16
12
13
13
13
13
12
14
14
12
13
13
13
11
11
10
12
12
11
Feels °C
15
15
11
1
5
8
11
10
8
10
9
8
9
8
7
2
2
2
7
7
6
  • 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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