Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 07 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.2°C
0.3° 

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


Flatrock surf forecast from 7 Sep 2026:

  • Best quality surf: Thursday 10 Sep, 6AM (local time) - 11ft (3.5m), 16s period, SSW swell with offshore winds.
  • Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 13ft (4.0m), 19s period, SSW swell with 10,156 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 6AM (local time) - 8ft (2.5m), 17s 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 Tuesday (Sep 08) at 6AM. The primary swell is predicted to be 2.5m and 17s period. The wind is predicted to be offshore 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 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 1.4m 6s period and expected on Wednesday (Sep 09) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Tue 8th Sep)8ft (2.5m) 17s
Best Surf 6AM (Thu 10th Sep)11ft (3.5m) 16s
Most Powerful 9AM (Wed 9th Sep)13ft (4.0m) 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’s headed our way for Flatrock. We’ve got a big, long period groundswell on the radar, but it’s not a week for beginners—this is serious water.

The action kicks off on Tuesday, the 8th of September. Early morning we’re looking at a solid 8ft swell from the SW, with a very long 17-second period. This is proper energy (4043), but it’s an advanced-only affair. The wind is light offshore from the ESE, just 3 mph, so it’ll be glassy and clean. This is a standout moment—the vibe is excellent for those who can handle it. The water temperature is about average for this time of year.

Come Tuesday afternoon, things go south quick. The wind swings onshore from the S at 16 mph, turning it into a cross-shore mess.

Wednesday, the 9th, the swell jumps to a massive 13ft from the SSW, with an even longer 19-second period. The energy reading is a whopping (10340). This is heavy-duty power. Early morning is clear with a cross-offshore breeze from the SE at 22 mph, keeping it surprisingly clean for such a big day. This is the other standout—huge, powerful waves for experts only. The afternoon stays similar size but the wind is still full.

Thursday the 10th still has a solid 12ft to 10ft SSW swell. Morning brings a fresh offshore from the E at 19 mph, leaving the surf clean. Afternoon eases a touch to 10ft with a lighter offshore breeze—still a great session for the advanced crew.

From Friday the 11th onward, the swell starts to dip. Friday morning is 8ft from the SSW, but with a cross-offshore wind. The energy is still moderate (2178). By the weekend, the swell drops to around 5ft to 6ft, but the winds get messy. Saturday morning is a cross-offshore, but the surf is small and the quality is marginal.

Sunday the 13th and Monday the 14th are pretty poor. The swell fades a little, but the wind is cross-shore or onshore and choppy. Not worth paddling out.

Tuesday the 15th sees a bit of a rebound. Morning offers a clean 7ft SW groundswell with a gentle offshore breeze from the E. The energy (2124) is moderate, and the conditions are clean. This is a nice window for experienced surfers again.

Wednesday the 16th morning is another highlight: a clean 10ft from the SW, very light offshore wind, and strong energy (3842). That will be a clean, powerful morning.

After that, the outlook gets blustery. Thursday the 17th is small and average. Friday the 18th is a write-off: strong winds up to 28 mph from the NNW blow it out. The weekend of the 19th and 20th has more size (12ft to 7ft), but near-gale force onshore winds ruin it. Not for paddle surfing—this looks like a kite session.

The final days, from the 21st to the 23rd of September, see the swell hang around 7ft to 8ft, but the winds are either cross-shore or onshore with rain. Energy is moderate, but the quality is poor for a surfer.

So, if you’re a grommet or a weekend warrior, stay home this week. The big winners are Tuesday morning, the 8th of September, and Wednesday morning, the 9th of September, for expert surfers only.

Stay safe out there.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 13°C on Thu morning, min 10°C on Tue night). Winds increasing (light winds from the ESE on Tue morning, strong winds from the SSE by Tue night).

Days 5-7 Weather Summary

Mostly dry. Warm (max 21°C on Sat afternoon, min 11°C on Thu night). Winds increasing (light winds from the NNW on Fri morning, strong winds from the N by Sat night).

Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
6
5
2
2
6
7
7
5
5
4
3
3
3
2
2
2
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)
2.5
SW
18
2.5
SW
17
2.5
SW
16
3
SSW
16
4
SSW
19
4
SSW
17
3.5
SSW
16
3.5
SSW
16
3
SSW
16
2.4
SSW
15
2.3
SSW
15
2.3
SSW
16
2.2
SSW
16
1.6
SW
15
1.8
SW
16
1.8
SW
17
1.6
SW
16
1.5
SW
16
1.3
SW
15
Wave Graph
Metric surfscale
Energy kJ
4373
4043
3543
4523
10156
8608
7109
5319
4056
2445
2178
2731
2535
1187
1707
1858
1256
1082
685
Wind (km/h)
20
E
5
ESE
25
S
35
SSE
35
SE
35
SE
35
ESE
30
E
25
E
25
E
15
NE
10
S
20
NE
25
NNE
10
NNW
25
NNE
35
NNW
20
NW
20
W
Wind State
off
off
cross
cross-off
cross-off
cross-off
off
off
off
off
cross-off
cross
cross-off
cross-off
cross-on
cross-off
cross
cross-on
on
High Tide
1:53AM0.20m
12:02PM0.53m
00:52AM0.23m
12:22PM0.55m
00:39AM0.29m
12:41PM0.53m
00:43AM0.36m
12:56PM0.51m
00:57AM0.43m
1:08PM0.47m
1:15AM0.49m
1:19PM0.44m
1:36AM0.53m
Low Tide
4:35AM0.18m
7:30PM0.05m
5:23AM0.12m
7:19PM0.07m
5:58AM0.06m
7:12PM0.07m
6:29AM0.03m
7:09PM0.06m
6:58AM0.02m
7:10PM0.04m
7:25AM0.03m
7:15PM0.01m
part cloud
cloud
cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:39
6:37
6:35
6:35
6:33
6:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:13
6:14
6:15
6:15
6:15
6:16
6:16
 mm
Temp °C
12
12
12
12
11
12
11
13
13
12
16
17
17
19
21
21
19
18
17
Feels °C
8
8
7
5
3
5
4
7
7
7
14
15
12
14
17
17
11
14
17
  • 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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