Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 20 Aug 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
14.8° C
0.2° 

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


Flatrock surf forecast from 20 Aug 2026:

  • Best quality surf: Sunday 23 Aug, 6AM (local time) - 10ft (3.0m), 17s period, SW swell with cross-offshore winds.
  • Most powerful swell: Thursday 27 Aug, 3PM (local time) - 10ft (3.0m), 19s period, SW swell with 6,300 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 8ft (2.4m), 15s 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 (Aug 22) at 9PM. The primary swell is predicted to be 2.4m and 15s period with a secondary swell of 1.4m and 19s. 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 Thursday (Aug 27) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Thursday (Aug 27) at 3AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Sat 22nd Aug)8ft (2.4m) 15s
Best Surf 6AM (Sun 23rd Aug)10ft (3.0m) 17s
Most Powerful 3PM (Thu 27th Aug)10ft (3.0m) 19s

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


The Lowdown

Alright folks, Rusty here. Let's look at what's coming up for Flatrock, a reef break that's fairly consistent. The water temp is about average for this time of year, nothing unusual there.

We've got a solid run of swell on the cards, but it's not all smooth sailing. The first few days are a bit of a write-off with messy cross-onshore winds and questionable conditions, so don't bother paddling out until later in the week. Things start to look up on Sunday the 23rd. The morning is clean with a NNE cross-offshore breeze and an 8.2ft SW groundswell running at 16 seconds. That's a long period, which means the reef here will be handling it well, shaping up some nice lines. The combined energy is strong (3721), so there's plenty of power.

The real standout, though, is without a doubt Friday the 28th of August. The morning session is an absolute gem. We've got a 10.0ft SW swell with a 16-second period, and a clean, gentle offshore from the ESE. That's a recipe for perfection at this spot. The combined energy is pumping (5022), and while it's big, it's a top-tier window for those with the skills. It's the best the forecast has to offer, hands down.

After that, the swell sticks around but the winds get tricky again. There's a notable pulse on Tuesday the 1st of September with an 8.2ft SW swell and 17-second period, but the cross-onshore winds will keep it from being pristine. Then another big one rolls in on Friday the 4th of September with an 11.5ft SW swell and 18-second period. It's a powerhouse (7026), but the cross-shore wind will put a chop on it. That one's for the experts only.

Short Range Forecast

Mostly dry. Very mild (max 15°C on Fri night, min 12°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Mon morning. Very mild (max 15°C on Sun night, min 11°C on Tue night). Winds decreasing (fresh winds from the S on Mon night, calm by Tue night).

Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
3
2
3
3
4
5
4
3
4
2
3
0
6
2
3
3
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3
SW
15
2.5
SW
15
2.5
SW
16
3
SW
16
3
SW
15
2.5
SW
15
2.4
SW
15
2.5
SW
16
2.4
SW
16
1.9
SW
15
1.5
SW
14
1.4
SW
14
3
SW
16
3.5
SW
16
3
SW
15
2.5
SW
14
2.1
SW
13
1.6
SW
13
1.6
SW
16
Wave Graph
Metric surfscale
Energy kJ
3402
2668
3865
4084
3330
2880
2449
3721
2726
1446
902
661
4066
6288
3713
2557
1430
864
1248
Wind (km/h)
20
WSW
15
WSW
15
W
15
WSW
15
SW
10
WSW
10
NE
15
NNE
10
WNW
15
ENE
15
NNW
15
SE
35
S
30
S
30
S
10
S
10
NNW
20
NW
15
N
Wind State
cross-on
cross-on
on
on
cross-on
cross-on
cross-off
cross-off
cross-on
cross-off
cross-on
cross-off
cross
cross
cross
cross
cross-on
cross-on
cross
High Tide
4:32AM0.40m
1:32PM0.34m
5:45AM0.35m
11:40AM0.42m
11:50AM0.47m
1:03AM0.20m
12:07PM0.52m
00:38AM0.23m
12:27PM0.55m
00:40AM0.28m
Low Tide
9:44AM0.30m
9:08PM0.04m
8:29AM0.35m
8:57PM0.06m
8:21PM0.08m
7:44PM0.09m
4:42AM0.16m
7:27PM0.08m
5:25AM0.10m
7:24PM0.07m
cloud
cloud
cloud
clear
clear
clear
clear
clear
part cloud
cloud
light rain
light rain
part cloud
part cloud
clear
part cloud
part cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:01
7:00
6:58
6:58
6:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:00
6:00
6:01
6:02
6:02
6:04
6:05
 mm
2
1
Temp °C
14
12
14
15
13
13
13
14
15
15
15
13
14
13
12
12
11
11
11
Feels °C
10
9
10
11
10
11
13
10
12
12
11
9
10
5
5
7
8
7
8
  • 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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