Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 pm 04 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 4 Sep 2026:

  • Best quality surf: Saturday 5 Sep, 6PM (local time) - 16ft (5.0m), 14s period, SW swell with onshore winds.
  • Most powerful swell: Wednesday 9 Sep, 12PM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,587 kJ wave energy.
  • Next surfable swell (1★+): Saturday 5 Sep, 6PM (local time) - 16ft (5.0m), 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 Saturday (Sep 05) at 6PM. The primary swell is predicted to be 5.0m and 14s period with a secondary swell of 3.5m and 14s. The wind is predicted to be onshore as the swell arrives.

The most powerful waves expected at Flatrock in the next 16 days are 4.0m 19s and forecast to arrive on Wednesday (Sep 09) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Sep 09) at 6AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Sat 5th Sep)16ft (5.0m) 14s
Best Surf 6PM (Sat 5th Sep)16ft (5.0m) 14s
Most Powerful12PM (Wed 9th Sep)13ft (4.0m) 19s

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


The Lowdown

Alright, surf is gonna be a bit of a mixed bag over the next couple of weeks. We’ve got a slow start, but there are a couple of windows that are gonna be proper, especially for the more experienced crew. The first few days are gonna be a write-off, so don't get too keen.

The first real opportunity doesn't show up until the 7th. Those early days of big, lumpy, onshore slop just aren't doing it for us at Flatrock. You're looking at 11.5ft to 13ft of junky swell with strong winds all over it. That’s not surfable, that's just a washing machine. The combined energy is moderate at best in that 4000-5000 (5088, 4142, 4947) range but it's all for nothing with that wind. It’s better to just sleep in.

Then, we get a shift. On the 7th, the wind swings offshore and stays clean for a good stretch. The swell drops to something more manageable, around 5.2ft, and that's when Flatrock starts to wake up. The energy is still fairly weak, down in the three-digit range (1095, 1625), but it's clean with a good SW direction. This is your pick for the first part of the week. Monday (7th) and Tuesday (8th) morning look like the best of it. Tuesday morning, there's a bump in size to 8.2ft from the SW with a 17-second period and the energy jumps up over 3800 (3805). That's proper groundswell, and with light offshore winds it should be holding some nice lines. This is a big, powerful reef at this size, so it's one for the experienced surfers only.

The middle of the week gets a bit hairy. Wednesday (9th) brings a big jump in size, up to 11.5ft to 13ft with a long 19-second period. The energy is huge, pushing 13989 on Wednesday morning. The winds are offshore, so it'll be clean, but this is serious, heavy water and only for the experts. It's a bit of a beast, that one. Thursday (10th) holds in at 11.5ft in the morning before coming down a bit to 9.8ft in the afternoon. The energy is still in the 6000s (6694, 5181) and the winds are offshore and clean. It stays big and powerful through this period.

By the 11th, the swell eases off to a nice 7.5ft and the energy settles down too (2202). The wind is still offshore, making it clean and lined up. This is a much more user-friendly size than the last couple of days, but even so, 7.5ft on a reef is still a serious wave. The good conditions look to hang around for the 12th. Friday (11th) is probably your best all-round day for cleanliness and power.

The weekend of the 12th and 13th sees the swell ease off a little more, but the winds get a bit tricky. The glassy conditions on Saturday afternoon with a 4.6ft SW swell and an 18-second period look dreamy, but the crowd might be out. It’s a good one, but there’s not a ton of size. Sunday turns a bit average with stronger, more cross-shore winds.

The following week starts with a flat spell. The 14th is virtually dead, just dribbles of energy. It’s a blank run for a couple of days. But then, around the 16th, there's some promise with a clean offshore 7.5ft swell, but the energy is only moderate. It’s more of a decent surf than a standout.

The real standouts, though, are the 18th and 19th. On the 18th, it jumps back up to 13ft. Friday afternoon the 18th is looking glassy as hell with a 13ft SW groundswell and the energy is over 6000 (6347) and building. That’s going to be epic. Then Saturday the 19th keeps it firing, with 13ft of swell and the energy in the 8000s (8316). The wind is light and cross-on on Saturday arvo, which isn't perfect, but with that much power, it'll still be firing. This is the big finale of the run, the one to really keep an eye on, but it's a long way off, so treat it as promising but not set in stone.

All in all, get on it from the 7th to the 12th, and if you’re an expert, clear your calendar for the 18th and 19th. Stay stoked.

Short Range Forecast

Mostly dry. Very mild (max 18°C on Fri afternoon, min 12°C on Sat morning). Winds decreasing (near gales from the W on Fri night, light winds from the SW by Sun morning).

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Tue afternoon. Very mild (max 14°C on Mon afternoon, min 9°C on Wed night). Winds increasing (light winds from the W on Tue morning, strong winds from the SSE by Tue night).

Fri
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
3
4
4
2
4
4
6
5
4
2
6
6
7
6
6
4
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
2.5
SW
15
4
SW
12
3.5
SW
13
3.5
SW
14
3
SW
14
2.5
SW
14
2
SW
13
1.6
SSW
13
1.6
SW
14
2.4
SW
18
2.5
SW
17
2.5
SW
16
3
SSW
16
3.5
SW
19
4
SSW
18
4
SSW
17
3.5
SSW
16
3
SSW
16
2.5
SSW
15
Wave Graph
Metric surfscale
Energy kJ
5069
3308
4142
4947
5087
3369
2570
1367
875
893
3914
3805
3216
3971
8450
9402
8486
6694
5155
3243
Wind (km/h)
35
NW
40
WNW
50
WSW
35
WSW
15
SW
5
SW
10
SSW
25
SE
20
E
20
ESE
20
ESE
10
ENE
15
S
30
S
45
SSE
40
SE
35
ESE
30
E
25
ESE
25
E
Wind State
cross-on
on
on
cross-on
cross-on
cross-on
cross-on
cross-off
off
off
off
off
cross-off
cross
cross-off
cross-off
cross-off
off
off
off
High Tide
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
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
cloud
part cloud
part cloud
part cloud
cloud
part cloud
clear
clear
part cloud
cloud
part cloud
cloud
light rain
part cloud
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
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
4
Temp °C
18
16
13
13
13
13
13
12
14
14
12
13
12
13
12
12
10
12
12
11
Feels °C
12
11
3
5
8
11
11
8
10
10
8
11
9
7
2
2
2
7
7
7
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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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