Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 am 14 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, 9AM (local time) - 11ft (3.5m), 16s period, SW swell with 5,892 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 16s and forecast to arrive on Friday (Aug 14) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Aug 16) at 12AM.

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 9AM (Fri 14th Aug)11ft (3.5m) 16s

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


The Lowdown

G’day, I’m Rusty, and I’ve got the goods on what’s coming our way.

We’re kicking off with a serious pulse of south-west groundswell that’s gonna have the advanced crew frothing. Flatrock is the only break on the radar, and it’s a reef setup that demands experience. The water’s sitting at 59°F, which is pretty much bang on average for this time of year – nothing unusual there.

The real standout is Thursday afternoon the 13th through to Friday morning the 14th. That Thursday arvo sees a solid 12ft swell out of the south-west, with a period of 15 seconds, pushing some serious energy into the coast – we’re talking a combined energy reading of 5696 (that’s strong to very strong wave energy). Winds are light onshore at 9 mph from the west, so it’s a bit messy. But then Friday morning – that’s the time to be in the water. You’ve got the same 12ft swell, period bumping to 16 seconds, combined energy hitting 5892, and the wind goes glassy. Dead flat, 3 mph from the west, offshore. That is exceptional surf, but you need to be an expert – this is heavy reef territory and very long-period swell, so expect bigger sets, longer lulls, and waves that will stand up fast. For point breaks or reefs like this, that long period is a dream, but be warned, it’s only for the skilled crew. Crowds can sometimes be an issue here, so get in early.

Friday afternoon drops off a touch with a cross-onshore wind, but Saturday the 15th brings another highlight. Saturday morning has a 10ft south-west swell at 16 seconds (combined energy 4128) with a clean 9 mph offshore easterly. That’s excellent, clean surf for experienced surfers. Saturday afternoon stays good with 8ft and offshore breezes.

Sunday the 16th and Monday the 17th keep the clean, offshore winds going, with swells dropping from 7ft down to 7ft. Still great quality for those who can handle it. Monday morning has a clear sky, 6 mph offshore from the ENE, and a 7ft swell at 16 seconds – clean and fun.

After that, we hit a big lull. From Tuesday the 18th through Wednesday the 19th, the swell drops below 6ft, winds turn messy, and conditions go poor – those days are best skipped. That’s a couple of days with nothing worthwhile.

Then we get a bit of a pulse again from Thursday the 20th, but it’s compromised by cross-onshore winds for a few days. The swell builds back to 10ft by Friday the 21st, but it’s choppy and onshore – not for surfing. That stretch is pretty average until we get to Saturday the 22nd. Saturday morning has a 13ft south-west swell at 13 seconds (combined energy 5580) with a cross-shore wind – it’s marginal and only for experts, but Saturday afternoon cleans up a bit with lighter winds and a 13ft swell at 14 seconds (6183 combined energy). If you’re an expert and can handle big, raw power, it might be worth a look, but it’s not the cleanest.

From Sunday the 23rd onward, we see more 10ft to 12ft swells, but onshore and cross-onshore winds dominate, making conditions poor for the most part. The end of the month (around the 25th to 27th) sees very strong winds – 22 to 28 mph – and big swells. With Flatrock being a reef and the winds howling onshore, this setup looks more interesting for kite surfing than paddle surfing.

The only other potential standout in the second week is Friday the 28th – a 10ft south-west swell at 18 seconds (combined energy 6617) with lighter cross-onshore winds. It’s promising but less certain this far out. Overall, your best bet is locked in for Friday morning the 14th – glassy, big, and powerful at Flatrock.

Stay safe out there.
Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Fri night. Very mild (max 15°C on Sat morning, min 11°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 3mm), mostly falling on Tue afternoon. Very mild (max 19°C on Tue afternoon, min 11°C on Mon morning). Winds increasing (calm on Mon morning, fresh winds from the NNE by Tue night).

Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
6
5
6
5
5
4
4
4
4
4
4
3
2
2
0
0
0
2
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)
3.5
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
1.8
SW
15
1.7
SW
15
1.8
SW
17
1.6
SW
16
1.2
SW
16
1.3
SW
15
1.3
SW
15
2.1
SW
14
2.4
SW
16
2.2
SW
15
2
SW
15
Wave Graph
Metric surfscale
Energy kJ
5892
5609
5403
4128
3441
2185
1929
1604
1267
2008
1561
1212
1858
1415
728
799
677
1838
2865
2150
1692
Wind (km/h)
5
SSW
10
SW
15
SE
10
ESE
20
ESE
20
E
20
E
20
E
20
E
10
ENE
10
SE
20
NE
30
NE
20
N
30
W
35
WNW
30
W
15
W
5
WNW
15
W
20
SSW
Wind State
glassy
cross-on
cross-off
cross-off
off
off
off
off
off
off
cross-off
cross-off
cross-off
cross
on
on
on
on
on
on
cross
High Tide
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
3:55AM0.44m
2:10PM0.34m
Low Tide
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
9:36AM0.24m
9:04PM0.01m
cloud
cloud
light rain
part cloud
part cloud
light rain
part cloud
part cloud
clear
clear
clear
part cloud
clear
rain showers
rain showers
clear
part cloud
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:09
7:09
7:07
7:07
7:05
7:05
7:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:55
5:57
5:58
5:58
5:59
6:00
6:00
 mm
1
1
1
2
Temp °C
14
14
14
15
15
14
14
14
13
13
14
13
17
19
15
14
14
14
14
15
14
Feels °C
12
11
11
12
11
11
9
9
9
12
11
10
11
14
8
7
8
10
12
11
11
  • 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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