Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 am 12 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 11 Sep 2026:

  • Best quality surf: Wednesday 16 Sep, 6AM (local time) - 10ft (3.0m), 15s period, SSW swell with offshore winds.
  • Most powerful swell: Tuesday 15 Sep, 6AM (local time) - 11ft (3.5m), 15s period, SW swell with 5,512 kJ wave energy.
  • Next surfable swell (1★+): Saturday 12 Sep, 6PM (local time) - 6ft (1.8m), 16s 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 12) at 6PM. The primary swell is predicted to be 1.8m and 16s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Flatrock in the next 16 days are 3.5m 15s and forecast to arrive on Tuesday (Sep 15) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Sunday (Sep 13) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Sat 12th Sep)6ft (1.8m) 16s
Best Surf 6AM (Wed 16th Sep)10ft (3.0m) 15s
Most Powerful 6AM (Tue 15th Sep)11ft (3.5m) 15s

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


The Lowdown

Alright folks, Rusty here. Let’s look at what’s on offer for this one spot, Flatrock. It’s an exposed reef break for advanced surfers only, and it’s fairly consistent, which is good. We’ve got a bit of a wait on our hands though. The first few days are grim with poor surf or dodgy conditions, so don’t bother paddling out just yet.

Saturday the 12th kicks things off, but it’s a mess. You’ve got a 6ft SW swell with a long 15 second period, but the wind is a cross-off from the NNE at 12 mph. Combined wave energy is strong at 2180, but the conditions are marginal. It’s not worth suiting up. Sunday the 13th and Monday the 14th are a total write-off with onshore winds and poor conditions. Forget about it.

Things start to look a bit more interesting on Tuesday the 15th. The swell pushes up to 10ft from the SW with a solid 15 second period, and the wind turns cross-off from the SSE. Wave energy is very strong at 4187, but the forecast is still marginal. That’s big, heavy reef stuff for experts only. Wednesday the 16th is where we get our first real standout. Wednesday afternoon is the pick of the early run. You’re looking at an 8ft SSW swell, 14 second period, with perfect offshore wind from the East at 16 mph. The combined energy is very strong at 3639, and conditions are clean and excellent for experienced surfers. This is the one to circle on the calendar.

Thursday the 17th brings a drop in size to 7ft SSW, but the afternoon goes glassy with a WSW breeze at just 3 mph. That’s clean, smooth waves. Friday the 18th onwards turns rubbish again with strong winds and poor surf. There’s a big gap of poor conditions until Sunday the 20th. That afternoon the swell jumps back to 10ft SW with a cross-off wind and very strong energy at 5109, but the conditions are still labeled marginal. Not a standout.

Now, hold onto your board. Monday the 21st. Monday morning is the best on offer in this whole outlook. You’ve got 12ft of SW swell with a 17 second period. The wind is a cross-off from the NE at 16 mph. The combined wave energy is massive at 10894. Conditions are clean. That is proper, powerful, long-period groundswell. It will be working beautifully on this reef. It’s big, over 8ft, so experts only, but it will be a session to remember.

The rest of the week is a mix of big, unruly swell with onshore winds and poor quality. Wednesday the 23rd sees a whopping 15ft SW swell, but with onshore wind and a warning that it’s too big for the break. That’s a no-go. The tail end of the outlook on Thursday the 24th offers up a glassy 8ft SSW swell in the morning, which is great for experts, and then Sunday the 27th finishes with a clean, offshore 3ft SW swell with a 19 second period. That’s a very long period groundswell. It will be lined up and perfect on a reef like this.

So to sum it up, the best on offer is clearly Monday the 21st morning for the biggest, cleanest, most powerful swell, with Wednesday the 16th afternoon and Thursday the 24th morning as our next best bets. For the rest, it’s a waiting game.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sat night. Warm (max 22°C on Sat afternoon, min 12°C on Mon night). Mainly fresh winds.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 17°C on Thu night, min 9°C on Tue night). Winds decreasing (fresh winds from the SE on Tue afternoon, light winds from the SW by Thu afternoon).

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
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
3
2
0
0
0
1
1
3
3
3
3
5
5
5
3
3
2
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
SW
15
1.9
SW
16
1.4
SW
15
1.9
SW
16
1.4
SW
16
1.6
SW
14
1.7
SW
13
1.6
SW
12
2.5
SW
16
3
SW
15
3
SW
14
3
SW
14
3
SSW
15
3
SSW
15
2.5
SSW
15
2.1
SSW
14
1.7
SSW
14
1.5
SSW
13
1.3
SSW
17
1.1
SW
16
1.1
SW
15
Wave Graph
Metric surfscale
Energy kJ
1540
1806
844
1852
976
1016
917
712
3373
3865
3912
3768
3784
3487
3037
1700
1048
734
1009
595
472
Wind (km/h)
25
NNE
15
NNW
30
NNE
35
WSW
30
W
25
WSW
15
W
15
W
30
SSW
30
SSE
30
SSE
25
ESE
25
E
25
ESE
25
E
20
NE
5
SW
20
NNE
30
N
15
NW
30
NNE
Wind State
cross-off
cross
cross-off
on
on
on
on
on
cross
cross-off
cross-off
cross-off
off
off
off
cross-off
cross-on
cross-off
cross
cross-on
cross-off
High Tide
1:08PM0.47m
1:15AM0.49m
1:19PM0.44m
1:36AM0.53m
1:28PM0.41m
1:58AM0.55m
1:35PM0.38m
2:21AM0.55m
1:40PM0.36m
2:44AM0.52m
1:41PM0.34m
3:08AM0.48m
1:32PM0.33m
Low Tide
7:10PM0.04m
7:25AM0.03m
7:15PM0.01m
7:50AM0.05m
7:25PM-0.02m
8:13AM0.08m
7:36PM-0.03m
8:33AM0.13m
7:49PM-0.03m
8:52AM0.17m
8:02PM-0.02m
9:06AM0.22m
8:11PM0.00m
clear
part cloud
rain showers
clear
clear
clear
clear
part cloud
part cloud
cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:33
6:31
6:30
6:28
6:28
6:26
6:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:16
6:16
6:17
6:19
6:20
6:20
6:21
 mm
2
Temp °C
20
22
21
14
14
14
14
15
15
12
13
11
11
12
10
14
15
17
18
20
21
Feels °C
14
18
16
8
8
11
12
12
11
5
5
4
5
6
6
11
13
11
12
16
16
  • 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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