Surf Forecasts:
Big Rock surf forecast from 12 Jul 2026:
- Best quality surf: Monday 13 Jul, 11PM (local time) - 10ft (3.0m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 18 Jul, 2PM (local time) - 16ft (5.0m), 16s period, WSW swell with 13,167 kJ wave energy.
- Next surfable swell (1★+): Monday 13 Jul, 11PM (local time) - 10ft (3.0m), 15s 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 (Jul 13) at 11PM. The primary swell is predicted to be 3.0m and 15s 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 5.0m 16s and forecast to arrive on Saturday (Jul 18) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Wednesday (Jul 15) at 5PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 13th Jul) | 10ft (3.0m) 15s |
| Best Surf | 11PM (Mon 13th Jul) | 10ft (3.0m) 15s |
| Most Powerful | 2PM (Sat 18th Jul) | 16ft (5.0m) 16s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
Alright team, Rusty here. Let’s break it down for Big Rock.
We’re looking at a real mixed bag ahead. There’s plenty of swell on the cards, but the wind is going to be the enemy for most of it. You’ll need to be patient and pick your days.
The first real swell of the period hits Monday the 13th. It’s a solid 12ft SW groundswell with a 16-second period, packing a ton of energy (6285). The wind is a light cross-onshore, so it’s a bit bumpy but definitely rideable. The afternoon is similar, just a little less juice.
Tuesday the 14th is the first real window. The swell drops a touch to 10ft, still a long-period SW groundswell (15 seconds), and the energy is still strong (3813). The wind flips to a light cross-offshore from the NE, and that’s the key. You’ll get clean, groomed faces. This is a proper day for the experienced crew, those waves are going to have some serious push. The water temp is about where it should be for the time of year.
From Wednesday the 15th through to the end of the next week, it’s a write-off. The wind goes onshore and stays there. Wednesday the 15th has a strong N wind making a mess of the 8ft swell. The rest of the week is a blur of strong cross-onshore winds, rain, and lumpy, choppy surf. Saturday the 18th sees the swell peak at a massive 18ft from the WSW with an insane energy reading of 10855, but it’s blowing a gale onshore. That’s a kite-surfing special, not a paddle day.
Sunday the 26th gives us a small reprieve with a 5ft swell and a gentle cross breeze, but it’s nothing to write home about.
The real gold is at the end of the period. Monday the 27th and Tuesday the 28th are your best bets. On Monday, the swell is a clean 4ft from the WSW with a 14-second period and a light offshore breeze from the ESE. Glassy conditions on the reef. It’s not huge, but it’s perfect. Tuesday the 28th is even better, with the swell pushing up to 6ft, still a 14-second period, and a clean cross-offshore wind. The energy is a bit stronger (1874). This is the standout. The waves will be clean, long, and rippable. Expect a few others to have the same idea, but for a wave like that, it’s worth sharing.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Wed afternoon, min 11°C on Tue morning). Winds increasing (light winds from the S on Mon night, strong winds from the N by Wed morning). | Days 5-7 Weather SummaryHeavy rain (total 45mm), heaviest during Thu morning. Very mild (max 19°C on Wed night, min 12°C on Fri night). Winds increasing (light winds from the NW on Thu night, near gales from the W by Fri night). | ||||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sun 19 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 14 | W 13 | WSW 14 | WSW 16 | WSW 15 | WSW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8777 | 6285 | 5292 | 3970 | 3813 | 3326 | 2560 | 2008 | 3470 | 2843 | 5530 | 3051 | 1965 | 2032 | 1299 | 8223 | 10855 | 11327 | 6591 | 4137 | 3069 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | on | on | cross-on | on | cross-on |
High Tide | 8:26AM1.15m | 9:06AM1.14m | 9:44AM1.10m | 10:17AM1.03m | 10:42AM0.93m | 10:50AM0.82m | 10:19AM0.72m | ||||||||||||||
Low Tide | 5:59PM0.24m | 6:39PM0.27m | 7:15PM0.32m | 7:45PM0.38m | 8:00PM0.45m | 7:43PM0.50m | 6:40PM0.52m | ||||||||||||||
 |  | |  |  | | |  | |  |  |  | | | |  | | |  | | | |
 | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:20 | — |
 | 5:27 | — | 5:27 | — | — | 5:28 | — | — | 5:28 | — | — | 5:29 | — | — | 5:30 | — | — | 5:30 | — | — | 5:30 |
mm | — | — | — | — | — | — | — | — | — | 5 | 16 | 9 | 1 | 1 | 1 | 9 | 2 | 1 | 2 | — | 1 |
Temp °C | 15 | 14 | 14 | 14 | 12 | 14 | 15 | 19 | 20 | 19 | 17 | 17 | 16 | 17 | 17 | 15 | 14 | 14 | 14 | 15 | 15 |
Feels °C | 13 | 12 | 12 | 13 | 9 | 11 | 12 | 12 | 14 | 15 | 12 | 15 | 14 | 10 | 9 | 4 | 5 | 6 | 7 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 13 | WSW 12 | WSW 14 | — | — | WSW 16 | WSW 15 | WSW 14 | SW 13 |
| kJ | 8777 | 6285 | 5292 | 3970 | 3813 | 3326 | 2560 | 2008 | 3470 | 2843 | 5530 | 3051 | 1965 | 2032 | 1299 | — | — | 11327 | 6591 | 4137 | 3069 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | WSW 22 | SW 18 | WNW 13 | — | WNW 13 | NNW 6 | N 6 | WNW 12 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 45 | 1124 | 18 | — | 16 | 149 | 36 | 14 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | NW 14 | WNW 14 | — | — | — | WNW 13 | WNW 12 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 7 | 18 | — | — | — | 16 | 14 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNE 4 | N 6 | NNW 7 | NNW 6 | — | — | W 7 | N 6 | W 8 | W 13 | WSW 14 | — | — | — | — |
| kJ | — | — | — | — | — | — | 22 | 273 | 461 | 336 | — | — | 117 | 17 | 776 | 8223 | 10855 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 2 | 2 | 2 | 0 | 0 | 0 | 44 | 1105 | 221 | 53 | 306 | 2 | 2 | 144 | 221 | 359 | 1133 | 359 | 2 | 2 | 202 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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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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