Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 am 18 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 18 Aug 2026:

  • Best quality surf: Saturday 22 Aug, 9PM (local time) - 8ft (2.4m), 15s period, SW swell with cross-offshore winds.
  • Most powerful swell: Saturday 22 Aug, 3AM (local time) - 10ft (3.0m), 16s period, SW swell with 4,467 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 1.2m and 19s. 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 3.0m 16s and forecast to arrive on Saturday (Aug 22) at 3AM. 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 4s period and expected on Tuesday (Aug 18) at 9PM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Sat 22nd Aug)8ft (2.4m) 15s
Best Surf 9PM (Sat 22nd Aug)8ft (2.4m) 15s
Most Powerful 3AM (Sat 22nd Aug)10ft (3.0m) 16s

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


The Lowdown

Alright, mates, Rusty here. Let’s talk about the next couple of weeks at Flatrock. It’s a bit of a mixed bag, so let’s get into it.

We’re looking at a stretch that starts off pretty average, with a lot of onshore or cross-onshore winds chopping things up. The water temp is sitting around 59°, which is about normal for this time of year, so nothing wild there. The first real standout doesn’t come until next Sunday, the 23rd.

The Early Days (Aug 18-22)
The first few days are pretty grim. Tuesday and Wednesday are a write-off with strong winds and lumpy conditions. Thursday and Friday have some size, but the wind is all over it, making for messy, choppy surf. Nothing worth getting too excited about. We get a bit of a breather on Saturday the 22nd, with lighter winds, but it’s still not clean. The swell is solid, around 10ft, but the tide and wind are keeping it from being any good.

The First Standout (Aug 23)
Then, finally, on Sunday morning, the 23rd, things click into place. We’ve got a decent 8ft SW groundswell, with a period of 17 seconds. The wind swings to a light NE cross-off, which is going to make it glassy and clean. The wave energy is strong, hitting 3996 on the scale. This is the one to circle on the calendar. It’s not for the faint of heart at that size, but for experienced surfers, this is as good as it gets in this window.

The Middle Lull (Aug 24-28)
After that, we drop back into a bit of a lull. The swell backs off for a couple of days and the winds get messy again. Next week, from the 25th to the 28th, is mostly a poor run. There’s a solid pulse of energy on the 26th and 27th, but it comes with brutal onshore winds, making it completely unsurfable. It’s a classic case of plenty of ocean, but nothing you’d want to paddle out into.

The Second Standout & Beyond (Aug 29 - Sept 2)
The surf starts to clean up again on Saturday the 29th, but it’s small. The real gem of the second week is on Monday morning, the 31st of August. We see a nice 4ft SW swell, with a very long 18-second period. The wind is light ENE offshore, dead glassy. It’s a smaller day, but the quality will be superb, especially if you can find a point or a reef to handle that long-period swell. The energy is moderate at 2059, but the conditions will be perfect. The following morning, September 1st, also looks promising, with a clean 7ft swell and cross-off winds, so that’s another good option.

Later in the window, on September 2nd, we see another push of 10ft swell, but it’s looking a bit more dicey with the winds. That one’s a wait-and-see. The long-range stuff is promising, but less certain. For now, the 23rd is your best bet for size and power, and the 31st is your best bet for pure, clean conditions on a smaller day. It’s a mixed bag, but there are a couple of days worth getting out of bed for.

Rusty out.

Short Range Forecast

Light rain (total 3mm), mostly falling on Tue night. Very mild (max 18°C on Tue afternoon, min 12°C on Tue morning). Winds decreasing (fresh winds from the WNW on Tue night, light winds from the SSW by Thu night).

Days 4-6 Weather Summary

Mostly dry. Very mild (max 16°C on Fri night, min 12°C on Fri morning). Wind will be generally light.

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
1
0
0
0
0
1
1
2
3
3
3
4
4
5
5
3
4
2
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)
1.8
SW
17
1.5
SW
16
1.3
SW
16
1.3
SW
15
2.3
WSW
15
2.4
SW
13
2.1
SW
16
2.1
SW
16
2.4
SW
15
2.4
SW
15
3
SW
17
3
SW
16
3
SW
16
2.5
SW
15
2.4
SW
14
2.5
SW
17
2.4
SW
16
2
SW
15
1.6
SW
14
1.4
SW
14
1.2
SW
13
Wave Graph
Metric surfscale
Energy kJ
1837
1187
834
799
2178
2032
2212
2269
2618
2550
4133
4301
4228
3135
2416
3996
2726
1672
978
743
488
Wind (km/h)
25
NNE
30
N
35
WNW
30
WNW
25
W
25
WNW
20
NW
20
WNW
15
SW
15
SW
15
W
15
WSW
10
SSW
10
SSW
10
E
15
NE
5
SW
15
NE
10
NNW
10
W
10
N
Wind State
cross-off
cross
cross-on
on
on
on
cross-on
on
cross-on
cross-on
on
on
cross-on
cross
off
cross-off
cross-on
cross-off
cross-on
on
cross
High Tide
2:20PM0.39m
3:24AM0.46m
2:21PM0.36m
3:55AM0.44m
2:10PM0.34m
4:32AM0.40m
1:32PM0.34m
5:45AM0.35m
11:40AM0.42m
11:50AM0.47m
1:03AM0.20m
Low Tide
8:39PM0.00m
9:16AM0.19m
8:52PM0.00m
9:36AM0.24m
9:04PM0.01m
9:44AM0.30m
9:08PM0.04m
8:29AM0.35m
8:57PM0.06m
8:21PM0.08m
7:44PM0.09m
clear
part cloud
rain showers
part cloud
cloud
part cloud
clear
clear
part cloud
cloud
cloud
part cloud
part cloud
clear
part cloud
cloud
cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:05
7:05
7:03
7:01
7:01
7:00
6:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:59
6:00
6:00
6:00
6:01
6:02
6:02
 mm
3
Temp °C
16
18
15
14
14
14
15
15
14
14
14
16
14
14
14
14
15
14
14
14
14
Feels °C
11
12
9
8
8
9
12
11
12
11
11
12
12
11
12
12
14
11
12
12
14
  • 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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