Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 8 am 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.2°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 30 Aug 2026:

  • Best quality surf: Sunday 30 Aug, 9PM (local time) - 7.5ft (2.3m), 17s period, SW swell with offshore winds.
  • Most powerful swell: Friday 4 Sep, 12AM (local time) - 11ft (3.5m), 16s period, SW swell with 5,998 kJ wave energy.
  • Next surfable swell (1★+): Sunday 30 Aug, 12PM (local time) - 4.5ft (1.3m), 19s period with SSW 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 30) at 12PM. The primary swell is predicted to be 1.3m and 19s period with a secondary swell of 1.4m and 13s. 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 3.5m 16s and forecast to arrive on Friday (Sep 04) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+)12PM (Sun 30th Aug)4.5ft (1.3m) 19s
Best Surf 9PM (Sun 30th Aug)7.5ft (2.3m) 17s
Most Powerful12AM (Fri 4th Sep)11ft (3.5m) 16s

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


The Lowdown

Alright, Rusty here. Let’s break it down for the imperial crew.

The swell window is open, and we’ve got a nice run of groundswell heading our way, but it’s not all sunshine. The first few days are worth getting excited about, especially if you’re an experienced surfer. After that, it gets tricky with wind and size.

Flatrock is the only show in town, and it’s a reef setup that demands respect. The water temp is sitting at 59°F, which is pretty much dead average for this time of year, so nothing unusual there.

We kick off this Sunday morning, August 30th. The conditions are a treat: a clean 3-foot SSW swell with a 20-second period rolling in. That’s a very long period groundswell – proper energy. The wind is a gentle offshore from the east, making for clean, glassy faces. The combined swell energy is reading 1322, which is moderate but with that period, it’ll feel punchy. This is a solid session for the advanced crew. The afternoon sees the swell jump to 7 feet, but the wind goes cross-offshore, keeping it rideable.

Monday morning, August 31st is the standout. This is the best on offer. You’ve got a clean 8-foot SW swell with an 18-second period – that’s a powerful, long-period groundswell with a combined energy of 7405, which is strong. The wind is a cross-offshore breeze from the NNE. This is big, powerful, and clean. It’s expert territory at that size. The afternoon gets a little cross-on, but the morning window is the one.

Tuesday, September 1st is a write-off. Strong cross-shore winds and onshore winds blow through the whole day, making a mess of the 5-foot to 6-foot swell. Save your energy.

Wednesday, September 2nd through to Thursday, September 3rd are all onshore, with onshore winds and solid 8-foot to 10-foot SW swell. The raw power is there (energy readings between 2580 and 3967), but the wind is against us. It’s a messy, blown-out affair. Not worth paddling out.

Friday, September 4th offers a small glimmer. The morning is messy with a cross-shore wind and a big 12-foot SW swell (energy 5650), but the afternoon cleans up. The wind goes cross-offshore, the swell drops to 10 feet, and it’s clean. That’s a big, powerful wave for experts only, but it’s rideable. The afternoon session is the go.

Saturday, September 5th and Sunday, September 6th are a write-off. Strong onshore winds from the southwest ruin the 8-foot to 10-foot swell. It’s lumpy, cross-on, and messy.

Monday, September 7th and Tuesday, September 8th stay poor. The wind stays cross-on, and even though the swell on Tuesday afternoon hits 12 feet from the SSW (energy 7712 – very strong), it’s choppy and cross-on. Not for the faint of heart.

Wednesday, September 9th morning is a real highlight. A clean 10-foot SW swell with a 16-second period and a light offshore wind from the ESE. The energy is 4128. It’s clean, powerful, and for experts only. The afternoon gets a cross-shore wind, so the morning is the window.

Thursday, September 10th morning is clean again. A 7-foot SSW swell with a 15-second period and a cross-offshore NNE breeze. It’s clean, solid, and good for experienced surfers. The afternoon gets a little cross-on.

Friday, September 11th morning is another big one. A 10-foot SW swell with a 19-second period – that’s very long period, powerful stuff. The energy is 7003. The wind is cross-offshore from the north. It’s clean and massive. This is a serious session for experts.

Saturday, September 12th and Sunday, September 13th drop off in quality. The wind is cross-shore and cross-on, making the 6-foot to 8-foot swell messy.

Monday, September 14th closes the window with strong onshore winds and a near gale, making the 6-foot to 6-foot swell a complete mess.

The best bets are Monday morning, August 31st and Friday morning, September 11th. Both are big, clean, and powerful swells for experts. The Wednesday morning, September 9th session is also a cracker.

Stay safe out there.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 19°C on Mon afternoon, min 13°C on Tue night). Mainly strong winds.

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Fri afternoon. Very mild (max 18°C on Fri morning, min 12°C on Fri night). Winds increasing (light winds from the N on Thu night, near gales from the WSW by Fri night).

Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
3
5
7
3
3
0
0
0
0
0
0
0
0
5
0
0
0
0
0
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
SW
13
2
SSW
18
2.3
SW
17
2.5
SW
18
2.5
SW
17
2.3
SW
16
1.9
SW
15
1.5
SW
15
1.9
SW
16
2.5
SW
16
3
SW
14
3
SW
14
2.5
SW
13
3
SW
14
3.5
SW
16
3
SW
15
2.5
SW
15
3.5
SW
15
3.5
SW
13
3.5
SW
15
3.5
SW
16
Wave Graph
Metric surfscale
Energy kJ
664
2519
3003
4649
4138
2578
1588
953
1829
3130
3025
3777
2549
3228
5998
4131
3135
5762
3890
4958
5123
Wind (km/h)
15
E
15
SE
15
E
15
NNE
10
NNW
25
NNE
40
NNW
30
WNW
25
WSW
25
W
30
WNW
30
WNW
20
W
25
WNW
20
NNE
50
N
50
NW
50
W
40
SW
20
WSW
20
NW
Wind State
off
cross-off
off
cross-off
cross-on
cross-off
cross
on
cross-on
on
on
on
on
cross-on
cross-off
cross
cross-on
on
cross-on
cross-on
cross-on
High Tide
1:44PM0.51m
1:55AM0.48m
1:59PM0.46m
2:20AM0.51m
2:10PM0.40m
2:46AM0.52m
2:12PM0.35m
3:15AM0.51m
1:57PM0.31m
3:47AM0.47m
1:07PM0.31m
4:29AM0.42m
Low Tide
7:53PM0.02m
7:59AM0.02m
8:02PM0.01m
8:29AM0.06m
8:11PM0.00m
8:59AM0.12m
8:18PM-0.00m
9:27AM0.19m
8:22PM-0.01m
9:50AM0.27m
8:21PM-0.01m
9:26AM0.36m
8:15PM-0.00m
clear
clear
clear
clear
clear
clear
cloud
part cloud
part cloud
cloud
cloud
cloud
part cloud
part cloud
rain showers
light rain
rain showers
rain showers
cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:50
6:50
6:48
6:47
6:46
6:43
6:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:07
6:07
6:08
6:09
6:09
6:10
6:12
 mm
1
2
2
3
Temp °C
16
18
15
17
19
18
17
16
13
14
14
15
15
15
14
18
16
15
13
13
12
Feels °C
14
15
10
13
16
14
10
11
8
8
8
10
11
11
12
9
8
6
6
8
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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