Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 am 13 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 13 Aug 2026:

  • Best quality surf: Friday 14 Aug, 9AM (local time) - 11ft (3.5m), 16s period, SW swell with glassy winds.
  • Most powerful swell: Friday 14 Aug, 3AM (local time) - 11ft (3.5m), 17s period, SW swell with 7,109 kJ wave energy.
  • Next surfable swell (1★+): Friday 14 Aug, 9AM (local time) - 11ft (3.5m), 16s 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 Friday (Aug 14) at 9AM. The primary swell is predicted to be 3.5m and 16s 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 3.5m 17s and forecast to arrive on Friday (Aug 14) 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 0.7m 4s period and expected on Sunday (Aug 16) at 6AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Fri 14th Aug)11ft (3.5m) 16s
Best Surf 9AM (Fri 14th Aug)11ft (3.5m) 16s
Most Powerful 3AM (Fri 14th Aug)11ft (3.5m) 17s

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


The Lowdown

Right then, let's have a look at what's on the cards for the next couple of weeks.

We've got one spot to focus on, Flatrock, and there's actually some alright windows in the forecast, but you've got to be patient and pick your sessions. The water's sitting at 59°, which is pretty much spot on average for this time of year, nothing unusual there.

Right off the bat, Thursday the 13th is a write-off. The swell's there at a solid 12ft, but the wind is onshore and messy, so it's just not worth paddling out for.

Now, Friday the 14th morning is where it starts to get interesting. That morning session is looking like the standout early call. The swell is still a meaty 12ft out of the southwest, but the real killer is that glassy wind. It'll be clean as a whistle at Flatrock, perfect lines for the advanced crew. This one's an expert-only affair at that size though.

Saturday the 15th keeps the good vibes rolling. Morning has a clean 10ft southwest swell with a decent offshore breeze, and the arvo cleans up even more with a moderate offshore wind on an 8ft swell. Same deal – big, powerful, and clean for those who can handle it. The combined energy is strong, peaking at 4181 on Saturday morning, so there's plenty of grunt in the water.

Sunday the 16th drops a little in size but stays clean with offshore winds all day. Expect 7ft easing to 7ft, still a good, pushy wave for experienced surfers.

Monday the 17th is another clean day, with the swell easing slightly to 6-7ft. The wind is cross-offshore, so the faces will be tidy, but the energy is still decent at around 2288. A good solid Monday session.

Then we hit a bit of a lull and some messy conditions from Tuesday the 18th through Thursday the 20th. Tuesday morning is salvageable at 6ft with a clean cross-off, but the afternoons and Wednesday get choppy and cross-onshore. By Thursday the 20th, a fresh breeze and rain make it a write-off.

There's a couple of rough days following that, with strong onshore winds and poor conditions, so don't bother from Friday the 21st through Monday the 24th. There's a big spike in swell on Sunday the 23rd, but with 15ft and howling onshore wind, it's just a washing machine.

Things start to look up again on Tuesday the 25th, with an 8ft southwest swell, but it's cross-onshore and choppy. Not the best.

Wednesday the 26th afternoon is a huge, wild card. The swell jumps to 16ft with a southwest direction and a cross-shore wind. The energy is through the roof at 19541, but the forecast actually says it's too big for Flatrock. Unless you're a top-tier charger on a big-wave gun, give this one a miss.

The real second standout of the whole forecast is Thursday the 27th. You've got an 12ft southwest swell, offshore winds from the east-northeast, and clean conditions. The energy is 6218, so it's pumping. This is another day for the experts only, but the quality will be exceptional.

The final few days, Friday the 28th, drop right off. A small 3ft swell appears in the arvo, but with a very long 18-second period, it'll be tricky on a reef break like Flatrock. The energy is weak at 1644, so it's a marginal end to the window.

To wrap it up: If you're an advanced surfer, the absolute best windows are Friday the 14th morning for the glassy 12ft, and Thursday the 27th for another clean, powerful 12ft with offshore wind. Everything else is either too small, too messy, or too big.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Fri night. Very mild (max 15°C on Thu night, min 13°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Some drizzle, heaviest during Tue night. Very mild (max 16°C on Tue morning, min 11°C on Sun night). Wind will be generally light.

Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
5
4
5
6
5
6
5
5
4
4
4
4
4
4
4
2
0
0
4
3
5
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3.5
SW
16
3.5
SW
15
3.5
SW
16
3.5
SW
16
3.5
SW
16
3.5
SW
16
3
SW
16
2.5
SW
15
2.3
SW
14
2.2
SW
14
2
SW
14
1.8
SW
14
2
SW
16
1.9
SW
15
1.2
SW
19
1.7
SW
17
1.4
SW
16
1.3
SW
16
1.5
SW
15
1.7
SW
15
2.1
SW
14
Wave Graph
Metric surfscale
Energy kJ
6564
5696
6940
5892
5609
5403
4181
3241
2185
1929
1604
1253
2008
1650
1055
1722
1078
823
1001
1220
1665
Wind (km/h)
10
W
15
W
15
SW
5
WNW
10
SW
15
ESE
15
ESE
20
E
20
E
25
E
20
ESE
20
E
15
ENE
5
SSE
15
NE
25
NNE
20
NNW
20
WNW
10
S
15
S
20
E
Wind State
on
on
cross-on
glassy
cross-on
cross-off
off
off
off
off
off
off
cross-off
cross-off
cross-off
cross-off
cross-on
cross-on
cross-off
cross
off
High Tide
1:27PM0.58m
1:18AM0.29m
1:44PM0.55m
1:37AM0.36m
1:57PM0.50m
2:01AM0.41m
2:07PM0.46m
2:27AM0.45m
2:15PM0.42m
2:55AM0.47m
2:20PM0.39m
3:24AM0.46m
2:21PM0.36m
Low Tide
8:14PM0.09m
6:55AM0.02m
8:11PM0.09m
7:28AM0.03m
8:12PM0.07m
7:58AM0.05m
8:17PM0.04m
8:26AM0.09m
8:27PM0.01m
8:52AM0.13m
8:39PM0.00m
9:16AM0.19m
8:52PM0.00m
cloud
cloud
part cloud
cloud
cloud
light rain
cloud
cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
cloud
rain showers
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:11
7:09
7:09
7:07
7:07
7:05
7:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:54
5:55
5:57
5:58
5:58
5:59
6:00
 mm
1
1
Temp °C
14
14
15
15
14
13
14
14
13
14
13
12
14
14
14
16
16
15
13
13
14
Feels °C
12
11
12
13
12
10
11
10
9
9
8
7
13
12
10
10
11
11
10
10
10
  • 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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