Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 pm 14 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.6°C
0.8° 

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


Flatrock surf forecast from 14 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, 3AM (local time) - 10ft (3.0m), 16s period, SW swell with 4,560 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 16 Sep, 6AM (local time) - 10ft (3.0m), 15s period with SSW 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 Wednesday (Sep 16) at 6AM. The primary swell is predicted to be 3.0m and 15s 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 3.0m 16s and forecast to arrive on Tuesday (Sep 15) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Sep 20) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Wed 16th Sep)10ft (3.0m) 15s
Best Surf 6AM (Wed 16th Sep)10ft (3.0m) 15s
Most Powerful 3AM (Tue 15th Sep)10ft (3.0m) 16s

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


The Lowdown

Alright, let’s talk about one spot that’s got pulses running: Flatrock. It's a reef break, so you’re looking at proper waves with a defined take-off zone. Right now, water temp sits around 60°F with a 1°F anomaly – that’s pretty average for this time of year, so just your usual wetsuit season.

We’re starting off with a bit of a wait. The first real recommendation doesn’t kick in until Wednesday the 16th of September. Monday the 14th and Tuesday the 15th are a write-off for quality: Monday is cross-onshore and sloppy with a combined swell energy of 1553 (moderate energy, but messy). Tuesday has a big 10ft SW swell with a very long 15-second period (groundswell), but the cross-off wind and marginal tide conditions mean it’s not a goer – the energy is there (3715) but the setup is wrong.

Wednesday morning, September 16th is your first standout. The swell is still pumping at 10ft from the SSW, with a 15-second period, and the key here is offshore wind from the ESE at 16 mph. That’s clean, with combined energy of 4201 (strong wave energy). This is big enough that it is only for experienced surfers – over 8ft pushes it into expert territory. The reef should handle the long-period energy okay, but strong offshore flow will groom it well.

Thursday the 17th drops a bit – still a solid 7ft SSW swell at 14 seconds, with cross-off winds in the morning from the NE at 12 mph. It’s clean, but the energy is moderate (1906). Afternoon turns onshore from the west at just 3 mph, which is glassy but directly onshore – that’s going to mess with the shape.

Friday the 18th is a bit of a mixed bag. Morning has a 5ft SSW swell with a very long 17-second period – that’s proper groundswell energy (1814) – but the cross-shore wind from the north at 19 mph creates lumpy, cross-chop conditions. Not worth it for paddle surfing. Afternoon is cross-onshore and dropping energy.

There’s a gap in quality from Saturday the 19th through Sunday the 20th. Swell sizes drop to 3ft to 3ft, and winds are cross to onshore. Energy is weak (as low as 426). A solid lull.

Monday the 21st of September brings a nice swing. Morning shows a 8ft SW swell at 13 seconds, with a light cross-off breeze from the NNE at 6 mph. That’s clean, moderate combined energy at 2391, and the light offshore angle means it will be glassy. This is a good window – not giant, but clean and very surfable.

Tuesday the 22nd is another standout for experienced surfers. Morning has a 8ft SSW swell at 15 seconds, with offshore wind from the east at 12 mph (moderate offshore). Energy is high at 2655, and the reef should handle the long-period groundswell well, giving it shape.

Wednesday 23rd and Thursday 24th are uninspiring – onshore and cross-onshore winds, dropping swell, poor conditions.

Now, Friday the 25th of September deserves a mention. Morning shows a 12ft SW swell at 16 seconds – that’s huge, deep groundswell with a combined energy of 6021. The wind is cross-shore from the north at 12 mph, which is not ideal, but the size is there. This is strictly for experts, and the cross-shore wind will keep it lumpy.

Saturday the 26th is a no-go: 12ft SW swell but with a screaming south wind at 31 mph (near gale) creating a mess.

Sunday 27th stays big (8ft SSW, 16 seconds) but cross-shore winds at 22 mph make it lumpy and not worth the paddle.

Monday 28th and Tuesday 29th show signs of easing back. Tuesday the 29th morning has a 7ft SW swell at 16 seconds with cross-off wind from the SSE at 12 mph – clean conditions but the rating is marginal. The energy is moderate (2320), and it could be okay for a session if you’re keen.

Best of the period: Wednesday morning, September 16th is the clear winner – big 10ft SSW, long period, offshore wind, strong energy (4201). Just remember that’s expert only. Monday morning, September 21st is the best call for a more manageable size with clean conditions.

Stay stoked, pick your moments, and don’t bother with the windy days.

- Rusty

Short Range Forecast

Mostly dry. Very mild (max 15°C on Mon afternoon, min 9°C on Tue night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 27°C on Sat afternoon, min 14°C on Thu afternoon). Winds increasing (light winds from the W on Thu afternoon, fresh winds from the WSW by Sat night).

Mon
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
3
3
3
4
5
4
5
3
3
4
1
0
1
0
0
0
0
0
5
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.6
SW
12
2.5
SW
16
3
SW
15
3
SW
14
3
SW
15
3
SSW
15
3
SSW
15
2.5
SSW
15
2.2
SSW
14
1.8
SSW
14
1.7
SSW
16
1.5
SSW
17
1.2
SW
15
1
SW
14
0.9
SW
13
0.9
SW
13
0.6
SW
18
1
SW
16
3
WSW
15
2.4
SW
13
Wave Graph
Metric surfscale
Energy kJ
736
3020
3715
3768
3873
4201
4222
3241
1906
1222
1498
1336
684
401
299
277
258
502
3427
2032
Wind (km/h)
20
WSW
30
S
30
SSE
30
SSE
25
ESE
25
ESE
25
SE
20
E
20
NE
5
W
15
NE
30
N
20
NW
20
NE
30
N
25
NNW
35
WSW
25
W
25
W
5
WNW
Wind State
cross-on
cross
cross-off
cross-off
cross-off
off
cross-off
off
cross-off
on
cross-off
cross
cross-on
cross-off
cross
cross-on
cross-on
on
on
on
High Tide
1:58AM0.55m
1:35PM0.38m
2:21AM0.55m
1:40PM0.36m
2:44AM0.52m
1:41PM0.34m
3:08AM0.48m
1:32PM0.33m
3:32AM0.43m
1:00PM0.33m
4:01AM0.37m
Low Tide
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
9:08AM0.28m
8:12PM0.03m
8:14AM0.32m
7:55PM0.06m
cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:28
6:28
6:26
6:24
6:22
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:17
6:19
6:20
6:20
6:21
6:22
6:22
 mm
Temp °C
15
15
12
12
10
11
12
10
13
14
16
18
21
22
24
27
21
14
14
14
Feels °C
11
11
5
5
4
6
7
6
10
12
10
10
18
18
17
21
17
10
10
13
  • 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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