Big Rock Surf Break

Lat Long: 33.87° S 114.98° E

Big Rock Surf Forecast and Surf Report

Issued: 7 pm 14 Sep 2026 (local time)

Forecast update in  hr  min

Today's Big Rock sea temperature is
17.8°C
0.8° 

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 14 Sep 2026:

  • Best quality surf: Tuesday 15 Sep, 8AM (local time) - 10ft (3.0m), 14s period, WSW swell with offshore winds.
  • Most powerful swell: Saturday 19 Sep, 5AM (local time) - 13ft (4.0m), 14s period, WSW swell with 6,871 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 15 Sep, 8AM (local time) - 10ft (3.0m), 14s period with WSW 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 Tuesday (Sep 15) at 8AM. The primary swell is predicted to be 3.0m and 14s period with a secondary swell of 0.4m and 19s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Big Rock in the next 16 days are 4.0m 14s and forecast to arrive on Saturday (Sep 19) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 6s period and expected on Thursday (Sep 17) at 11PM.

Wave TypeTime (AWST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Tue 15th Sep)10ft (3.0m) 14s
Best Surf 8AM (Tue 15th Sep)10ft (3.0m) 14s
Most Powerful 5AM (Sat 19th Sep)13ft (4.0m) 14s

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


The Lowdown

Alright, Rusty here, checking in from the coast. Let's have a look at what's on the table for the next couple of weeks at this spot.

We've got a solid run of swell coming in, but it’s not all clean sailing. The early action is for the more experienced crew only. Tuesday the 15th kicks things off with a proper SW groundswell, 10 ft and a long 14-second period. The combined energy is strong at 3665. With a light ENE offshore breeze in the morning, Big Rock will be absolutely pumping with clean, powerful lines. This is for intermediate to expert surfers only – it's a reef break, and that size packs a punch. The water temp is about average for this time of year, nothing unusual.

Tuesday afternoon the wind swings a little cross-off from the SSE, still light, and the swell holds. Good quality continues through the day, but that morning session is the standout.

Wednesday the 16th drops to 7 ft SW swell, still a long 13-second period. Morning has a NNE cross-off breeze, 12 mph, keeping it clean. It's still got plenty of energy (1398), but the conditions are a bit more manageable. Afternoon sees it ease to 5 ft with a light cross-shore breeze.

Thursday the 17th is a write-off. The wind swings onshore and the quality drops out completely. Friday the 18th is a weird one. The morning has a massive 8 ft W swell with a strong 28 mph NNE cross-off breeze – clean but wild, with energy at 4585. It's marginal at best, and the wind is strong. The afternoon sees a new, very long-period 16-second WSW groundswell at 6 ft, but it's a different vibe altogether.

We get a big, clean pulse of energy arriving on Friday the 25th. That’s the one to circle on the calendar. The morning shows a massive 18 ft SW groundswell with an 18-second period – that's an enormous, very long period groundswell. The combined energy is through the roof at 20093. The wind is a fresh cross-off from the SSE. However, this is too big for this break. The guidance tells us this swell is predicted to be too big for Big Rock. This is an expert-only situation, and even then, it’s a dicey proposition. The afternoon holds similar size and conditions. This is the most powerful and cleanest-looking event of the whole forecast, but the scale is off the charts for the spot.

The following week offers up a mix of clean but onshore-slanted conditions, with the swell fluctuating between 7 ft and 10 ft. Nothing really stands out as a guaranteed classic after that big Friday pulse. There's a good chance of decent waves, but you'll have to pick your sessions carefully with the wind.

Overall, the best bet for a great, surfable session is the Tuesday morning, but keep Friday the 25th in mind if you're an expert looking for a monumental challenge.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 24°C on Wed afternoon, min 10°C on Mon night). Winds increasing (light winds from the N on Wed afternoon, fresh winds from the NNW by Thu afternoon).

Days 5-7 Weather Summary

Heavy rain (total 26mm), heaviest during Fri night. Warm (max 20°C on Fri morning, min 13°C on Fri night). Winds decreasing (strong winds from the NNE on Fri morning, light winds from the WNW by Sun morning).

Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
5
5
5
4
3
3
2
1
0
1
2
3
0
0
0
0
3
2
4
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
14
3
SW
14
3
SW
14
2.4
SW
14
2
SW
13
1.5
SW
13
1.6
SW
14
1.5
WSW
14
1.3
WSW
13
1.7
WSW
12
2.5
W
12
1.8
WSW
16
4
WSW
15
3.5
WSW
14
3
WSW
14
2.4
WSW
13
2.2
WSW
12
2.5
WSW
14
3
SW
15
Wave Graph
Metric surfscale
Energy kJ
4370
3665
3280
2252
1387
721
1109
802
615
843
1934
1739
6251
5286
3616
1965
1435
2765
4334
Wind (km/h)
25
E
10
ENE
10
SSE
20
E
20
NNE
5
N
30
NE
25
NNW
30
NNW
30
N
45
NNE
25
SSE
35
SW
30
W
25
W
25
W
5
WNW
15
NW
15
N
Wind State
off
off
cross-off
off
cross-off
cross
cross-off
cross
cross
cross
cross-off
cross-off
cross-on
on
on
on
on
cross-on
cross-off
High Tide
10:43PM0.72m
9:41AM0.38m
11:04PM0.76m
11:28PM0.79m
11:55PM0.81m
00:25AM0.81m
1:03AM0.80m
2:38AM0.77m
Low Tide
7:39AM0.38m
2:06PM0.35m
2:02PM0.31m
2:13PM0.28m
2:26PM0.27m
2:39PM0.27m
2:51PM0.28m
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
light rain
heavy rain
part cloud
cloud
rain showers
light rain
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:20
6:18
6:16
6:16
6:15
6:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:09
6:10
6:10
6:12
6:13
6:13
6:14
 mm
4
19
1
2
Temp °C
15
17
19
21
21
24
22
19
19
18
20
15
14
15
16
16
16
17
17
Feels °C
11
15
17
19
18
24
20
18
16
13
13
7
7
7
11
11
14
15
15
  • 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 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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