Flatrock Surf Break

Lat Long: 34.68° S 135.32° E

Flatrock Surf Forecast and Surf Report

Issued: 2 pm 02 Sep 2026 (local time)

Forecast update in  hr  min

Today's Flatrock sea temperature is
15.6°C
0.8° 

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


Flatrock surf forecast from 2 Sep 2026:

  • Best quality surf: Wednesday 9 Sep, 12PM (local time) - 11ft (3.5m), 21s period, SW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 9 Sep, 3PM (local time) - 13ft (4.0m), 19s period, SSW swell with 11,058 kJ wave energy.
  • Next surfable swell (1★+): Thursday 3 Sep, 9PM (local time) - 11ft (3.5m), 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 (Sep 03) at 9PM. The primary swell is predicted to be 3.5m and 15s 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 4.0m 19s and forecast to arrive on Wednesday (Sep 09) at 3PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Tuesday (Sep 08) at 6PM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Thu 3rd Sep)11ft (3.5m) 15s
Best Surf12PM (Wed 9th Sep)11ft (3.5m) 21s
Most Powerful 3PM (Wed 9th Sep)13ft (4.0m) 19s

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


The Lowdown

Alright, grab your wettie, ‘cause I’ve been staring at the charts for Flatrock and there’s a bit of a mixed bag coming our way. This is a solid, exposed reef setup that needs the right wind, and we’ve got some serious size on the horizon, but the wind is gonna be the main character in this story.

Right now, the water temp is sitting at around 60°, which is pretty much bang on average for this time of year, so no surprises there.

The outlook kicks off on Wednesday, September 2nd, but honestly, it’s a write-off. We’ve got a 10ft SW swell (15-second period, so a nice groundswell) but it’s getting hammered by a 30 km/h W wind. The combined energy is moderate at 3197, but it’s just messy and poor.

Thursday, September 3rd is a bit of a washout too. The swell jumps to 13ft from the SW, period 14 seconds, and the energy is massive (10402), but it’s all cross-onshore and choppy. The morning is particularly grim with rain showers. The afternoon cleans up a little with a lighter 15 km/h breeze, but it’s still only marginal.

We start to see some hope on Friday, September 4th morning. The swell is 12ft from the SW, period 16 seconds (long-period groundswell), with a moderate 5921 combined energy. The wind goes cross-offshore from the NNE at 30 km/h, which will clean it up nicely. This is a solid, advanced wave. The afternoon gets wrecked by a 35 km/h NNW wind, so get in early.

Saturday, September 5th is a raw day. Strong WSW winds at 35 km/h, 13ft SW swell, 14-second period, with 5317 energy. It’s lumpy and onshore. Not one for the paddle.

Now, Sunday, September 6th morning is a proper standout. The sky is clear, wind is light from the NE at 10 km/h, making it cross-offshore and clean. The swell is still a solid 10ft from the SW, 14-second period, with 4010 energy. This is excellent for experienced surfers. The afternoon gets a cross-on wind, so the window is the morning.

Monday, September 7th morning gets interesting. The swell drops to 5ft from the SW, 13-second period, but the wind is offshore from the ESE at 25 km/h. The energy is lower at 918 but the conditions look clean. The afternoon sees a tiny 3ft wave with a massive 20-second period (very long groundswell), which is a bit tricky for a reef break but could have some fun lines.

Tuesday, September 8th morning is another big one. 10ft from the SSW, 17-second period, with a combined energy of 4593. The wind is gentle offshore from the ESE at 15 km/h. This is a real standout session for the advanced crew. The afternoon is still clean with an 8ft SSW swell.

Wednesday, September 9th is the big dog. The morning is a bit windy (40 km/h ESE), but the afternoon is the pick of the whole forecast. We’ve got a 13ft SSW swell, 19-second period, and a massive 11766 combined energy. The wind is strong offshore from the ESE at 40 km/h. The report says marginal, but the score is high. That is a heavy, powerful, clean wave—experts only.

Thursday, September 10th carries on the energy. The morning is fresh offshore at 35 km/h, with an 12ft SSW swell, 17-second period, and 7000 energy. The afternoon is still clean but the swell drops a touch.

From Friday, September 11th through to the end of the 16 days, the size drops and the conditions become more mixed. There are a few promising windows, like Sunday, September 13th morning (8ft SW, 16-second period, light SSE wind, clean) and Tuesday, September 15th morning (8ft SW, 15-second period, glassy conditions with WNW wind at 5 km/h), but nothing in the same league as that 9th.

If you’re an expert and you want the biggest, cleanest, most powerful waves of the month, you are looking at Wednesday, September 9th afternoon. The energy is off the charts (11766) and the offshore wind will make it a freight train. For a slightly more manageable but still excellent session, Sunday, September 6th morning and Tuesday, September 8th morning are your best bets.

Stay safe out there, and watch the sets.

Rusty

Short Range Forecast

Light rain (total 3mm), mostly falling on Thu morning. Very mild (max 18°C on Fri afternoon, min 12°C on Thu night). Winds increasing (calm on Thu night, strong winds from the W by Fri night).

Days 5-7 Weather Summary

Mostly dry. Very mild (max 15°C on Tue morning, min 10°C on Sat night). Winds increasing (calm on Sat night, fresh winds from the ESE by Mon night).

Wed
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
3
7
4
0
0
0
0
5
5
0
1
3
2
5
5
3
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
3
SW
15
3
SW
14
4
SW
14
3.5
SW
15
3.5
SW
16
3.5
SW
16
3
SW
16
2.5
SW
15
4
SW
14
3.5
SW
14
3.5
SW
14
3
SW
14
2.3
SW
14
1.6
SW
13
1.4
SW
13
1
SW
20
3
SSW
18
3
SSW
17
2.5
SSW
16
2.3
SW
16
Wave Graph
Metric surfscale
Energy kJ
3197
3544
6381
4890
6317
5921
4645
2978
5317
5570
4561
3017
2171
919
701
816
5332
4593
3456
2545
Wind (km/h)
30
W
30
W
20
SW
15
WSW
15
NE
30
NNE
35
NNW
50
W
35
WSW
25
WSW
5
W
10
NE
20
SW
30
SE
25
ESE
30
SE
25
ESE
15
ESE
25
SE
35
SE
Wind State
on
on
cross-on
cross-on
cross-off
cross-off
cross-on
on
cross-on
on
glassy
cross-off
cross-on
cross-off
off
cross-off
cross-off
off
cross-off
cross-off
High Tide
3:15AM0.51m
1:57PM0.31m
3:47AM0.47m
1:07PM0.31m
4:29AM0.42m
11:20AM0.44m
11:40AM0.50m
1:53AM0.20m
12:02PM0.53m
00:52AM0.23m
Low Tide
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
8:01PM0.01m
7:45PM0.03m
4:35AM0.18m
7:30PM0.05m
cloud
cloud
rain showers
part cloud
rain showers
part cloud
part cloud
rain showers
cloud
cloud
clear
clear
clear
part cloud
part cloud
cloud
part cloud
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:46
6:43
6:43
6:41
6:39
6:39
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:09
6:09
6:10
6:12
6:13
6:13
6:14
 mm
1
1
1
Temp °C
14
15
14
14
13
17
18
16
12
12
12
13
14
13
14
14
12
15
13
12
Feels °C
8
9
10
11
12
10
12
9
4
6
9
11
10
7
9
8
7
12
8
5
  • 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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