Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 am 06 Aug 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.2° C
0.0° 

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


Flatrock surf forecast from 5 Aug 2026:

  • Best quality surf: Monday 10 Aug, 3AM (local time) - 20ft (6.0m), 18s period, SW swell with onshore winds.
  • Most powerful swell: Thursday 13 Aug, 12AM (local time) - 26ft (8.0m), 17s period, SW swell with 33,758 kJ wave energy.
  • Next surfable swell (1★+): Thursday 6 Aug, 6PM (local time) - 8ft (2.5m), 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 Thursday (Aug 06) at 6PM. The primary swell is predicted to be 2.5m and 15s period with a secondary swell of 0.4m and 9s. 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 8.0m 17s and forecast to arrive on Thursday (Aug 13) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Tuesday (Aug 11) at 6AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Thu 6th Aug)8ft (2.5m) 15s
Best Surf 3AM (Mon 10th Aug)20ft (6.0m) 18s
Most Powerful12AM (Thu 13th Aug)26ft (8.0m) 17s

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


The Lowdown

Alright, Rusty here. Let’s look at what’s on offer for Flatrock.

Flatrock’s looking at a long stretch of swell, no doubt, but the conditions are gonna be a real battle for most of it. The setup is a reef break, exposed to the SW, and the winds are gonna make things ugly for days on end. We’re talking about a solid southwest groundswell rolling in, with periods hanging around the 16-second mark – that’s proper energy, long lines. But for a beach break, that long period can make things wall up and close out too straight. For a reef like Flatrock, it’s better, but when the wind’s on it, it doesn’t matter.

The water temp is 59°, which is bang on average for this time of year – no surprises there.

Thursday the 6th kicks off with the first surfable swell, but it’s not a day to get excited. A 6ft SW swell at 16 seconds (1554 combined energy) with a light cross breeze. It’s not clean enough to call it good, just marginal. The afternoon builds to 8ft but the wind shifts cross-on. Friday the 7th brings a bigger 8ft SW swell with a clean offshore breeze in the morning – that’s the first real window. The energy jumps to 3705, and with that 16-second period, there’ll be some push. But don’t get caught in the afternoon; the wind swings and it goes to junk.

Saturday the 8th and Sunday the 9th are a write-off. Strong onshore winds, rain, and building swell. By Sunday morning we’re looking at 12ft with a near-gale blowing straight onshore. That’s just dangerous and messy. The energy hits 5457, and then 12776 in the afternoon with a 20-second period – massive, but completely unsurfable with that wind.

This pattern of big swell and poor wind carries right through the next week. Monday the 10th sees 13ft swell, but it’s all onshore or cross-on. The energy stays huge, over 9000, but it’s all for nothing. Tuesday the 11th drops slightly to 7ft, but a strong breeze from the north ruins it. Wednesday the 12th is back to 13ft again. It’s a relentless grind of raw energy and bad wind.

Finally, on Thursday the 13th, there’s a moment. A massive 21ft SW swell predicted, with energy at 32,593. The data says the wind and tide are favorable, but that’s a note of caution: 21ft is way too big for anyone but absolute experts. It’ll be a monster. After that, the following Friday and Saturday drop back to 10ft and 12ft, but the wind is still onshore or cross-on, so it’s still poor.

The first true standout in the whole outlook is the morning of Sunday the 16th. After nearly two weeks of junk, the wind finally goes light offshore from the NNE. The swell has dropped to a manageable 7ft from the SW, with a 15-second period (2027 energy). The data flags it as excellent for experienced surfers. If you’ve been watching the forecast, that’s your window. It’ll be clean, lined up, and way less daunting than the earlier giants.

The second good window hits on the morning of Tuesday the 18th. A 6ft swell from the WSW at 14 seconds (1685 energy), and the wind is pure glass off the NE. Clean as a whistle. That’s the one for a board with a bit more rocker and a relaxed paddle. The morning of Thursday the 20th looks bleak again, with a 13ft SW swell and strong onshore wind. On balance, the best of this 16-day stretch is the Sunday morning the 16th at Flatrock – that’s your call to be on it.

Stay patient, keep an eye on the wind, and don't even think about paddling out on the 21ft day unless you’ve got a death wish and a tow-in crew.

Rusty.

Short Range Forecast

Moderate rain (total 12mm), heaviest on Fri afternoon. Very mild (max 16°C on Fri morning, min 11°C on Thu night). Winds increasing (light winds from the SW on Thu morning, strong winds from the WSW by Sat night).

Days 4-6 Weather Summary

Moderate rain (total 12mm), heaviest on Tue afternoon. Very mild (max 15°C on Mon afternoon, min 12°C on Sun morning). Winds decreasing (near gales from the WSW on Sun morning, moderate winds from the WSW by Mon morning).

Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
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
4
3
0
0
1
0
0
0
0
0
0
0
3
0
0
!
0
0
!
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
SW
16
2.3
SW
16
3
SW
16
2.5
SW
16
2.4
SW
17
2.3
SW
16
2.3
SW
16
2.4
SW
15
2.1
SW
14
3.5
SW
16
4
SW
20
4
SW
18
4
SW
17
4
SW
16
3.5
SW
15
2.2
SW
14
3
SW
13
4
SW
19
4
SW
18
4
SW
17
8
SW
17
Wave Graph
Metric surfscale
Energy kJ
1486
2612
3905
3678
3404
2676
2586
2449
1688
5457
12776
10184
9002
7161
5004
1864
2673
11467
10580
9577
33758
Wind (km/h)
10
SSW
10
SW
15
NE
30
NNE
30
NNW
40
N
30
N
25
NW
40
WNW
55
WSW
55
WSW
40
W
25
WSW
25
NW
35
N
45
NNW
45
NW
50
WSW
45
WSW
45
SW
30
SW
Wind State
cross
cross-on
cross-off
cross-off
cross-on
cross
cross
cross-on
on
on
on
on
on
cross-on
cross
cross
cross-on
cross-on
on
cross-on
cross-on
High Tide
2:26PM0.30m
5:50AM0.40m
10:26AM0.43m
11:28AM0.50m
12:06PM0.56m
1:39AM0.14m
12:38PM0.60m
1:07AM0.18m
1:05PM0.60m
1:06AM0.23m
Low Tide
10:37AM0.25m
9:30PM0.05m
9:16PM0.04m
8:51PM0.03m
8:33PM0.03m
8:25PM0.03m
4:35AM0.12m
8:22PM0.05m
5:35AM0.07m
8:19PM0.08m
clear
clear
clear
cloud
light rain
rain showers
clear
clear
rain showers
light rain
rain showers
rain showers
cloud
rain showers
clear
part cloud
thunderstorm
thunderstorm
rain showers
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:18
7:18
7:16
7:16
7:15
7:13
7:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:50
5:51
5:52
5:52
5:52
5:53
5:54
 mm
5
1
6
2
2
1
1
4
2
1
Temp °C
14
14
13
16
14
15
15
16
15
12
12
14
14
15
14
15
14
14
14
14
14
Feels °C
12
12
10
7
8
10
9
12
9
0
0
6
9
10
7
7
5
6
5
5
9
  • 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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