Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 am 24 Aug 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
14.9°C
0.1° 

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


Flatrock surf forecast from 24 Aug 2026:

  • Best quality surf: Monday 31 Aug, 3AM (local time) - 10ft (3.0m), 19s period, SW swell with cross-offshore winds.
  • Most powerful swell: Monday 31 Aug, 3AM (local time) - 10ft (3.0m), 19s period, SW swell with 7,228 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 26 Aug, 3AM (local time) - 6.5ft (2.0m), 13s 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 Wednesday (Aug 26) at 3AM. The primary swell is predicted to be 2.0m and 13s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Flatrock in the next 16 days are 3.0m 19s and forecast to arrive on Monday (Aug 31) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Aug 28) at 9PM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 26th Aug)6.5ft (2.0m) 13s
Best Surf 3AM (Mon 31st Aug)10ft (3.0m) 19s
Most Powerful 3AM (Mon 31st Aug)10ft (3.0m) 19s

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


The Lowdown

G’day, this is Rusty. Righto, we’ve got a solid 16-day window ahead for Flatrock (reef), a real exposed SW-facing jewel for the advanced crew. The water temp’s sitting at 59°, which is pretty much bang on average for this time of year, so nothing wild there. The whole period kicks off with some serious pulse, but you’ll need to pick your windows carefully because conditions get messy fast.

The main story here is a pumping SW groundswell with long 14-16 second periods, piling in with strong wave energy (1062) right from Monday morning the 24th. Offshore ENE breeze at 20 km/h, clean lines, and 5 ft of swell – that’s a proper standout for experienced surfers. But don’t get too excited for the arvo; the wind swings SW onshore and drops the quality to marginal.

Tuesday the 25th sees the swell jack up to 10 ft with energy going through the roof (7475), but it’s cross-shore winds and lumpy chop. That’s big, heavy water – over 8 ft, so strictly for experts. Keep your wits about you.

From Wednesday the 26th through Thursday the 27th, it’s a mix of 5 ft to 6 ft swell but cross-chop and lumpy conditions spoil it. Not worth paddling out unless you’re desperate.

Friday the 28th morning pulls up a bit cleaner: 8 ft SW swell with NNE cross-off wind, smooth face. Energy’s high (3214). That’s a decent session for the skilled crew, but it’s right on the edge of too big for intermediates.

Now, here’s the real sweet spot. Saturday the 29th and Sunday the 30th – both mornings dish up offshore winds (ENE and E), clean surface, and swell sitting at 5 ft to 4 ft. Saturday’s got 5 ft SW swell with moderate offshore energy (1167), while Sunday drops a bit but the period stretches to a very long 19 seconds (1201 energy). That groundswell will wrap nicely around the reef, with long lines and easy paddle outs between sets. These two mornings are the best of the first week – clean, manageable, and just glassy enough to make you smile. Crowds can pop up here sometimes, so get in early.

Monday the 31st of August ramps right back up to 10 ft SW groundswell with a long 18-second period, but it’s cross-shore and onshore winds. Too much power and chop for anything but a heavy session.

From 1st September through the next week, the swell stays solid but wind keeps messing things up. Tuesday 1st and Wednesday 2nd mornings offer some clean patches with cross-off wind (7 ft to 6 ft, SW), but the energy is high (1825–3210). Thursday 3rd and Friday 4th go onshore and lumpy again. Saturday 5th morning shapes up well with 8 ft SW, N cross-off wind, and clean (2467 energy) – worth a look for the experts.

Sunday 6th and Monday 7th September? Forget it. Winds howling 30–50 km/h, swell pumping 12 ft to 20 ft, with energy reading 10,000+ – that’s blown out and dangerous. Tuesday 8th stays messy with 13 ft and strong onshore winds.

The last real standout lands on Sunday the 30th of August morning – only 4 ft but that 19-second period makes it a dreamy longboard or step-up session if you’re keen. Otherwise, the best bet of the whole run is Saturday the 29th of August morning. Clean, friendly size, and that reef will be working. Things get unreliable in the second week, so keep an eye on those forecasts – but the first weekend is your call.

This is Rusty, signing off.

Short Range Forecast

Moderate rain (total 18mm), heaviest on Mon morning. Very mild (max 14°C on Mon afternoon, min 11°C on Tue night). Winds decreasing (fresh winds from the S on Mon night, calm by Tue night).

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Fri night. Warm (max 20°C on Thu afternoon, min 13°C on Thu morning). Winds decreasing (fresh winds from the ENE on Fri night, light winds from the SSE by Sat night).

Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
1
0
5
5
3
2
1
2
1
3
4
3
3
2
4
3
3
4
3
7
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
14
1.4
SW
14
2.3
SSW
13
3
SW
16
3
SW
14
2.1
SW
14
1.9
SW
13
1.6
SW
13
1.4
SW
15
1.5
SW
14
1.6
SW
19
3
SW
18
2.5
SW
16
2.2
SW
16
1.9
SW
14
1.6
SW
14
1.5
SW
13
1.2
SW
13
1.1
SW
19
2
SSW
17
3
SW
19
Wave Graph
Metric surfscale
Energy kJ
1002
754
1753
3746
3936
1564
1242
796
844
862
1782
4804
3116
2354
1505
1033
755
451
855
2242
6318
Wind (km/h)
20
ENE
10
SW
35
SSW
30
SSW
20
SSW
5
WSW
20
N
15
NW
15
NE
30
N
15
NNW
25
NE
25
NNE
15
N
35
ENE
25
ENE
10
E
15
E
15
E
15
S
10
ENE
Wind State
off
cross-on
cross
cross
cross
cross-on
cross
cross-on
cross-off
cross
cross
cross-off
cross-off
cross
cross-off
off
off
off
off
cross
off
High Tide
11:50AM0.47m
1:03AM0.20m
12:07PM0.52m
00:38AM0.23m
12:27PM0.55m
00:40AM0.28m
12:47PM0.57m
00:53AM0.33m
1:06PM0.57m
1:11AM0.38m
1:26PM0.55m
1:32AM0.43m
1:44PM0.51m
1:55AM0.48m
Low Tide
7:44PM0.09m
4:42AM0.16m
7:27PM0.08m
5:25AM0.10m
7:24PM0.07m
5:58AM0.06m
7:28PM0.05m
6:29AM0.02m
7:35PM0.04m
6:59AM0.01m
7:43PM0.03m
7:29AM0.01m
7:53PM0.02m
mod rain
mod rain
rain showers
part cloud
clear
clear
clear
clear
clear
clear
clear
cloud
cloud
cloud
rain showers
part cloud
part cloud
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:58
6:58
6:56
6:54
6:54
6:52
6:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:02
6:04
6:05
6:05
6:06
6:07
6:07
 mm
7
7
4
3
Temp °C
12
14
14
13
13
13
12
13
14
17
20
20
16
17
14
17
18
17
18
17
16
Feels °C
9
8
7
7
8
11
8
10
10
11
17
16
12
14
9
14
15
14
16
14
13
  • 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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