Big Rock surfForecast / WA – Margaret River / Australia

information circle12 Day Weather and Surf, issued 1 pm Wednesday 17 Dec 2025 AWST
Forecast update in hr  min  s Forecast update imminent
Big Rock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Big Rock sea temperature is
21.2° C
(Which is 1.8°C warmer than normal for this time of year)


Best Forecast Surf Conditions for Big Rock this week:

The surf forecast for Big Rock over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Dec 19) at 8AM. The primary swell is predicted to be 0.9m and 11s period with a secondary swell of 0.8m and 7s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Big Rock in the next 12 days are 3.5m 16s and forecast to arrive on Monday (Dec 22) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Tuesday (Dec 23) at 8PM.

Wave TypeTime (AWST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Fri 19th Dec)3ft (0.9m) 11s
Best Surf 5AM (Sun 21st Dec)7ft (2.2m) 13s
Most Powerful 5PM (Mon 22nd Dec)11ft (3.5m) 16s

Table - best surf conditions forecast for Big Rock over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 22°C on Thu afternoon, min 12°C on Thu night). Winds decreasing (strong winds from the SSE on Thu afternoon, light winds from the ESE by Fri morning).

Days 3-6 Weather Summary Mostly dry. Warm (max 23°C on Tue morning, min 11°C on Sat night). Winds decreasing (fresh winds from the S on Sat afternoon, light winds from the ESE by Sun morning).

Wed
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
2
2
0
1
0
0
0
2
2
3
0
1
3
1
5
4
4
2
3
4
Swell
Height Map
Wave Height (m) & direction (?)
3.5
SW
2.2
SSW
1.5
WSW
1.3
WSW
0.9
WSW
1
SW
1.1
SW
1.8
SW
3
SSW
3
SSW
2.3
SW
2.1
SW
2
SW
2
SW
2.5
SW
3.5
SW
3.5
SW
3
SW
2.4
SW
2
SW
2
SW
Period(s) (?)1191212111111109101013131214161514141313
Wave
Graph
(?)Metric surfscale
Energy kJ (?)24167146054792152332586761534177811201457128512252558635551593419226113261266
Wind
(km/h)
35
S
30
SSE
20
SSE
40
SSE
25
ESE
20
SW
35
S
30
S
35
SSE
35
SSE
20
ESE
20
SW
35
S
15
SE
25
S
35
SSE
30
SE
15
S
30
SSE
30
ESE
5
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
off
cross-
off
cross-
off
cross-
off
cross-
on
crosscrosscross-
off
cross-
off
cross-
off
cross-
on
crosscross-
off
crosscross-
off
cross-
off
crosscross-
off
offcross-
off
High Tide
/ height (m)
7:42PM
0.82
8:04PM
0.88
8:29PM
0.93
8:58PM
0.95
9:29PM
0.96
10:02PM
0.93
10:36PM
0.88
Low Tide
/ height (m)
5:31AM
0.13
5:51AM
0.13
6:14AM
0.13
6:40AM
0.14
7:09AM
0.16
7:42AM
0.18
8:16AM
0.21
Wed
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Sunrise--5:03--5:03--5:03--5:05--5:05--5:05--5:05
Sunset7:27--7:28--7:29--7:29--7:30--7:30--7:30--
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
Rain (mm)
---------------------
Temp. °C181721221721201718181517171720201623241828
Feels °C (?)1112161510171411101091311151613919181226
  • 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 12 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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