Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 pm 22 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 22 Aug 2026:

  • Best quality surf: Thursday 27 Aug, 6PM (local time) - 10ft (3.0m), 18s period, SW swell with glassy winds.
  • Most powerful swell: Thursday 27 Aug, 6PM (local time) - 10ft (3.0m), 18s period, SW swell with 6,751 kJ wave energy.
  • Next surfable swell (1★+): Sunday 23 Aug, 3AM (local time) - 8ft (2.5m), 14s 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 Sunday (Aug 23) at 3AM. The primary swell is predicted to be 2.5m and 14s period with a secondary swell of 1.5m and 18s. 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 18s and forecast to arrive on Thursday (Aug 27) at 6PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Sunday (Aug 30) at 12AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Sun 23rd Aug)8ft (2.5m) 14s
Best Surf 6PM (Thu 27th Aug)10ft (3.0m) 18s
Most Powerful 6PM (Thu 27th Aug)10ft (3.0m) 18s

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


The Lowdown

G’day, Rusty here. Let’s talk about what Flatrock’s got in store for the next couple weeks. It’s a reef break, open to a SW swell, and the water temp is about average for the season. Nothin’ unusual.

Alright, we’re off Sunday the 23rd with a 8ft SW swell, period a deep 16 seconds – that’s proper groundswell, energy 3721 (moderate to strong). Wind’s cross-off from the NNE at 12 mph, so it’s clean, but the surf report says marginal due to tides. Monday the 24th drops to 5ft SW, 14 seconds, energy 962 (weak to moderate). The mornin’s cross-off with some rain, but the afternoon goes glassy with an ESE breeze at 3 mph – that’s the cleanest session of the day, though the swell’s smaller.

Tuesday the 25th spikes to 10ft SW, 15 seconds, energy 7260 (strong). But the wind’s a fresh cross-shore from the SSW at 19 mph, lumpy. That’s too big for beginners, and the wind’s messy – only for experts who can handle bumpy waves. The arvo goes cross-on and choppy.

Wednesday the 26th: 6ft SW, 13 seconds, 1357 energy – cross-shore wind keeps it average. Thursday the 27th: mornin’ has 4ft SW but a very long 21-second period, energy 2435 (moderate). That long period means better shape but could be straight at the reef. Afternoon jumps to 10ft SW, 19 seconds, energy 8255 (very strong). Wind’s a gentle cross-on from the NW at 9 mph, so it’s clean-ish. That’s a standout for experienced surfers – big, powerful groundswell. Crowds are possible here sometimes.

Friday the 28th: 8ft SW, 16 seconds, 3726 energy, with a gentle NNE cross-off at 9 mph – clean, excellent for experienced. Saturday the 29th: 6ft SW, 14 seconds, 1236 energy, with a light offshore from the ESE at 6 mph – glassy and clean. Sunday the 30th: 5ft SSW, 19 seconds, 2174 energy, with a light offshore ESE breeze at 6 mph – clean, long-period, quality. Afternoon has 10ft SSW, 16 seconds, 4071 energy, with a gentle cross-off – big and clean for experts.

Monday the 31st: 10ft SW, 17 seconds, 4891 energy, cross-off from the N at 9 mph – clean, but arvo goes cross-on and messy. From Tuesday September 1st, it turns rough. Fresh cross-onshore winds, lumpy, poor surf. Thursday the 3rd: 12ft SW, onshore, poor. Friday the 4th: 12ft SW, 16 seconds, 5796 energy, onshore – marginal. Saturday the 5th: 7ft SW, cross-shore fresh breeze, lumpy. Sunday the 6th: 5ft SW, onshore, poor. Monday the 7th: 13ft SW, 18 seconds, 9983 energy (very strong), onshore – that’s big and messy, more for kite surfing than paddlin’.

Best on offer: Thursday the 27th afternoon and Sunday the 30th morning. Thursday arvo: 10ft SW, 19-second period, gentle cross-on – big, powerful, clean enough for experts. Sunday mornin’: 5ft SSW, 19 seconds, offshore – clean, long-period, quality shape. No gaps at the start, but a long stretch of poor days from September 1st through the 7th.

Stay safe, pick your windows. Rusty.

Short Range Forecast

Heavy rain (total 24mm), heaviest during Sun night. Very mild (max 17°C on Sun afternoon, min 11°C on Sun night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 19°C on Thu afternoon, min 11°C on Wed morning). Wind will be generally light.

Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
5
4
3
4
2
3
0
5
1
3
2
1
4
1
7
6
5
4
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.4
SW
14
2.5
SW
16
2.4
SW
16
1.9
SW
15
1.5
SW
14
1.4
SW
14
2.2
SW
13
3
SW
15
2.4
SW
14
2.1
SW
14
1.9
SW
13
1.6
SW
13
1.4
SW
15
1.3
SW
21
3
SW
19
3
SW
18
2.5
SW
16
2.4
SW
16
2
SW
14
Wave Graph
Metric surfscale
Energy kJ
2383
3721
2726
1446
902
671
1575
3729
2383
1663
1242
851
844
1445
6456
5825
3726
2839
1624
Wind (km/h)
10
E
20
NNE
5
WNW
10
ESE
25
ENE
5
ESE
35
SSW
30
SSW
20
SSW
10
W
20
N
15
NW
15
NNE
25
N
15
NW
15
NE
15
NNE
10
SSE
10
ENE
Wind State
off
cross-off
cross-on
off
cross-off
glassy
cross-on
cross
cross-on
on
cross
cross-on
cross-off
cross
cross-on
cross-off
cross-off
cross-off
off
High Tide
11:40AM0.42m
11:50AM0.47m
1:03AM0.20m
12:07PM0.52m
00:38AM0.23m
12:27PM0.55m
00:40AM0.28m
12:47PM0.57m
00:53AM0.33m
1:06PM0.57m
1:11AM0.38m
Low Tide
8:21PM0.08m
7:44PM0.09m
4:42AM0.16m
7:27PM0.08m
5:25AM0.10m
7:24PM0.07m
5:58AM0.06m
7:28PM0.05m
6:29AM0.02m
7:35PM0.04m
clear
part cloud
cloud
mod rain
heavy rain
light rain
rain showers
part cloud
clear
clear
clear
clear
clear
clear
clear
cloud
cloud
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:00
6:58
6:58
6:56
6:54
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:01
6:02
6:02
6:04
6:05
6:05
6:06
 mm
10
11
2
1
Temp °C
14
15
17
15
12
13
14
13
13
13
11
12
13
16
19
18
19
19
18
Feels °C
12
12
15
12
10
10
9
7
9
11
7
9
9
11
18
15
17
16
15
  • 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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