Big Rock Surf Break

Lat Long: 33.87° S 114.98° E

Big Rock Surf Forecast and Surf Report

Issued: 7 pm 05 Sep 2026 (local time)

Forecast update in  hr  min

Today's Big Rock sea temperature is
18.4°C
1.2° 

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


Big Rock surf forecast from 5 Sep 2026:

  • Best quality surf: Tuesday 8 Sep, 5AM (local time) - 13ft (4.0m), 16s period, SW swell with offshore winds.
  • Most powerful swell: Sunday 6 Sep, 8PM (local time) - 15ft (4.5m), 17s period, SW swell with 10,792 kJ wave energy.
  • Next surfable swell (1★+): Monday 7 Sep, 11AM (local time) - 11ft (3.5m), 16s period with SW swell.

Best Forecast Surf Conditions for Big Rock this week:

The surf forecast for Big Rock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 07) at 11AM. The primary swell is predicted to be 3.5m and 16s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Big Rock in the next 16 days are 4.5m 17s and forecast to arrive on Sunday (Sep 06) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Monday (Sep 07) at 8PM.

Wave TypeTime (AWST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Mon 7th Sep)11ft (3.5m) 16s
Best Surf 5AM (Tue 8th Sep)13ft (4.0m) 16s
Most Powerful 8PM (Sun 6th Sep)15ft (4.5m) 17s

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


The Lowdown

Alright, let’s have a look at what’s coming up. The window kicks off with a bit of a messy start, but there’s some real quality hiding in there if you’re patient and know what you’re doing.

The first call is for Big Rock – a reef break that’s fairly consistent and exposed to the swell. Water temp is sitting at about 65°F, which is a touch warmer than normal for this time of year. Not a huge deal, but it’s nice.

Saturday the 5th is a write-off. We’ve got rain showers, a cross-on wind at 16 mph, and a bumpy 10ft swell from the WSW with a period of 13 seconds. Combined energy is strong (3003), but the conditions are poor. Don’t bother.

Sunday the 6th is where it starts to turn. Morning sees a clean offshore wind from the SSE at 19 mph, with a 12ft swell from the WSW, period 12 seconds. Energy is up (4291), but the tide might be tricky. It’s marginal. The afternoon cleans up even more – same wind, but the swell shifts to SW and period bumps to 13 seconds, energy jumps to 7143. Still a marginal call, but the wave quality improves. This is a good option for stronger surfers.

Monday the 7th morning is the first real standout. Clear skies, a gentle cross-off breeze from the SE at 9 mph, and a 12ft SW groundswell with a very long period of 16 seconds. Energy is high (6307). This is exceptional for expert surfers – the long period will groom the reef nicely. Afternoon stays clean but the wind picks up to 19 mph – still cross-off, but it drops the score.

Tuesday the 8th is the best of the run. Morning has a 13ft SW swell, period 16 seconds, and a moderate cross-off breeze from the ESE at 12 mph. Energy is massive (8296). Conditions are clean and the reef will hold that size well. This is for experienced surfers only – it’s big, powerful, and lined up. The afternoon is similar but slightly smaller at 12ft with a gentle SE breeze. Both sessions are top-tier.

From Wednesday the 9th onward, the swell drops. Morning still has a 10ft WSW swell with a 16-second period, but the wind is a bit stronger. Afternoon is better with a gentle NE breeze. It’s still good, but not as firing as Tuesday.

Thursday the 10th sees the swell drop to 7ft – still WSW, period 14 seconds. The energy is moderate (1785). Morning is clean but light, afternoon gets a bit cross-on and small. Nothing special.

From Friday the 11th through to Saturday the 19th, it’s a long stretch of poor conditions. Winds are mostly cross-on or onshore, often strong, and the swell is either too big, too messy, or both. There’s a quick look on Monday the 14th morning – a 12ft WSW swell with a gentle NNE breeze, clean, and energy over 5000. That’s another expert session, but it’s a one-off in a bad run.

Wednesday the 16th morning is glassy – no wind, 8ft WSW swell, period 14 seconds. Energy is moderate (2618). That’s a rare clean window, but the swell is a bit smaller.

After that, from Thursday the 17th onward, it’s onshore junk. Big swells but poor quality – 18ft on the 19th, but with strong onshore winds, it’s a mess. That’s more of a kite surfing scene than paddle.

Overall, the clear standout is Tuesday the 8th – morning and afternoon – at Big Rock. Big, clean, powerful SW groundswell with light offshore winds. That’s the one to circle. Monday the 7th morning is also solid. The rest is either marginal or not worth the paddle.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Sat night. Warm (max 20°C on Tue afternoon, min 10°C on Sun night). Winds decreasing (fresh winds from the S on Sat night, light winds from the SE by Tue afternoon).

Days 5-7 Weather Summary

Mostly dry. Warm (max 20°C on Wed afternoon, min 10°C on Wed morning). Wind will be generally light.

Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
3
5
8
7
4
6
8
7
6
4
5
3
3
3
4
1
0
0
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
9
4
SW
12
2.4
WSW
17
4
SW
17
3.5
SW
16
3.5
SW
16
3.5
SW
16
4
SW
16
3.5
WSW
16
3.5
WSW
16
3
WSW
15
3
WSW
15
2.5
WSW
15
2
WSW
14
2
WSW
14
2.1
WSW
15
1.9
WSW
14
1.9
WSW
18
3
WSW
16
Wave Graph
Metric surfscale
Energy kJ
1526
4402
3378
9105
6018
5268
6621
8195
6917
5775
4278
3800
2620
1667
1644
1772
1454
2273
4324
Wind (km/h)
35
SSE
30
SSE
30
SSE
15
ESE
15
SE
30
SSE
25
ESE
25
ESE
15
SE
15
E
25
ENE
10
NE
20
ENE
25
NNE
15
N
15
ENE
20
NNW
25
NW
30
WSW
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
off
cross-off
cross-off
cross-off
cross
off
cross-on
cross-on
on
High Tide
5:24AM0.86m
6:53AM0.88m
7:55AM0.87m
00:50AM0.59m
8:46AM0.83m
11:34PM0.54m
9:30AM0.77m
10:58PM0.54m
10:08AM0.69m
10:34PM0.56m
Low Tide
3:20PM0.18m
3:55PM0.19m
4:26PM0.23m
1:13AM0.59m
4:50PM0.28m
2:42AM0.51m
5:02PM0.34m
3:34AM0.45m
4:57PM0.40m
4:22AM0.40m
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:31
6:31
6:30
6:28
6:26
6:26
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:04
6:04
6:05
6:06
6:06
6:07
6:07
 mm
1
3
Temp °C
15
15
15
12
14
17
13
15
20
16
15
20
19
15
18
17
18
18
18
Feels °C
10
7
7
6
10
12
7
10
16
11
10
17
15
10
16
15
16
16
13
  • 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 Big Rock Surf forecast

The above surf forecast table for Big Rock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Big Rock can be found by selecting the local surf guide option on the grey menu. Our Big Rock 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 (Big Rock) 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 Big Rock 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.

Big Rock is 85 km (53 miles) from the city of Bunbury. If you plan a holiday in Margaret River, look for hotels and other accommodation in Bunbury. Bunbury has rooms for a wide range of budgets as well as car hire and transport links.

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