
Surf Forecasts:
Big Rock surf forecast from 18 Jul 2026:
- Best quality surf: Wednesday 22 Jul, 11AM (local time) - 10ft (3.0m), 13s period, SW swell with offshore winds.
- Most powerful swell: Sunday 19 Jul, 5AM (local time) - 11ft (3.5m), 14s period, WSW swell with 5,387 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 11PM (local time) - 8ft (2.5m), 13s 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 Sunday (Jul 19) at 11PM. The primary swell is predicted to be 2.5m and 13s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Big Rock in the next 16 days are 3.5m 14s and forecast to arrive on Sunday (Jul 19) at 5AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Thursday (Jul 23) at 11AM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 19th Jul) | 8ft (2.5m) 13s |
| Best Surf | 11AM (Wed 22nd Jul) | 10ft (3.0m) 13s |
| Most Powerful | 5AM (Sun 19th Jul) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what Big Rock has cooking for the next couple of weeks. We’re starting off with some serious size, but the wind is going to be a battle for the first several days. Hang tight, because if you’re patient and can pick your window, there are some absolute gems hiding in this forecast.
The week kicks off with a solid 10-foot WSW swell, but a moderate cross-onshore breeze has it looking pretty average and choppy. The combined swell energy is pumping at 3929, but it’s not clean, so Sunday the 19th is more of a look-and-see day than a paddle-out. Monday the 20th and Tuesday the 21st see the swell backing off just a touch to the 7-foot to 8-foot range, but the wind stays messy – onshore and cross-shore – keeping the quality low. The energy remains high (1568 to 2686), but the surface is just not cooperating. These early days are a write-off.
Now, Wednesday the 22nd is where it gets interesting. That’s your first standout. Morning session sees the same 10-foot SW swell, but we get a clean offshore breeze from the ESE at just 6 mph. The combined energy is roaring at 3469, and the conditions are described as excellent for experienced surfers. This is proper size (over 8 feet), so this is for the crew who know what they’re doing. The afternoon sees the energy climb even higher to 4234, but a light cross-shore creeps in, so the morning is the cleaner call. Thursday the 23rd keeps the quality high with clean surf on a dropping 8-foot to 7-foot SW swell and light cross-offshore winds – another solid session for the skilled crew.
We hit a bit of a slump from Friday the 24th through to Sunday the 27th. The swell goes a bit wonky, the wind gets fresh and lumpy, and most of these windows get a big zero. On Saturday the 25th, with a fresh 22 mph cross-on and a 10-foot swell, the setup at this exposed reef is going to be more interesting for kite surfing than paddle surfing. Big Rock is fairly consistent, so we know a better pulse is coming. It’s just a matter of waiting out this windy patch.
And wait we do, because Monday the 27th brings the next big standout. Another 10-foot SW groundswell (14 second period) arrives, but this time with a clean cross-offshore breeze from the SE at 9 mph. The combined swell energy is 3109, and the call is excellent surf for the experienced. The afternoon holds at a still-chunky 8 feet with clean conditions. Tuesday the 28th continues the fun with a smaller 8-foot, but the period stretches out to 20 seconds in the afternoon on a tiny 4-foot swell – that’s a very long-period groundswell, which will offer long, powerful walls but will be best for the reef and point setups to keep it from breaking too straight.
The very end of the month and start of August is where we get the real heavy hitter. Sunday the 2nd of August is the champion window. We’re looking at a 13-foot WSW groundswell with a 16-second period. The combined energy is a massive 11124 – that’s exceptional wave energy. And the wind? Glassy, with just a slight air movement. This is “call in sick and go” territory, but only for absolute experts. The morning is glassy and perfect for the brave. The afternoon sees the size drop to a still-chunky 8 feet.
Monday the 3rd of August closes out the run with a 12-foot SW swell, but a light cross-on breeze makes it marginal, so the previous days are the ones to circle.
Keep in mind, the water temperature is about average for the time of year, so a decent spring suit is in order.
Stay sharp, pick your windows, and don't fight the wind.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Sun morning. Very mild (max 16°C on Sat night, min 14°C on Sun morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Fri afternoon, min 12°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | WSW 15 | WSW 14 | WSW 13 | SW 13 | SW 11 | SW 14 | SW 13 | SW 14 | SW 13 | SW 13 | SW 13 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | WSW 12 |
Wave Graph | |||||||||||||||||||
6541 | 3929 | 2860 | 2309 | 1478 | 1787 | 2088 | 2686 | 2121 | 2467 | 2775 | 4234 | 3094 | 1948 | 1417 | 1118 | 899 | 880 | 988 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | glassy | on | on | cross | cross | cross | cross-off | off | cross | off | cross-off | cross-off | cross-off | cross | cross | cross-on |
High Tide | 10:19AM0.72m | 7:20AM0.67m | 3:33AM0.72m | 4:03AM0.78m | 4:52AM0.84m | 5:39AM0.90m | |||||||||||||
Low Tide | 6:40PM0.52m | 5:16PM0.50m | 4:28PM0.44m | 4:18PM0.38m | 4:25PM0.34m | 4:37PM0.32m | |||||||||||||
— | 7:20 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:18 | — | — | 7:18 | — | — | |
5:30 | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:32 | — | — | 5:34 | — | — | 5:34 | — | |
mm | — | 3 | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 16 | 15 | 16 | 14 | 15 | 15 | 16 | 15 | 14 | 14 | 14 | 15 | 14 | 12 | 14 | 14 | 16 | 17 | 18 |
Feels °C | 9 | 11 | 11 | 11 | 10 | 10 | 11 | 10 | 9 | 10 | 12 | 13 | 10 | 8 | 12 | 12 | 11 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | WSW 15 | WSW 14 | WSW 13 | SW 13 | SW 11 | SW 14 | SW 13 | SW 14 | SW 13 | SW 13 | SW 13 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | SW 12 | SW 12 | WSW 12 |
6541 | 3929 | 2860 | 2309 | 1478 | 1787 | 2088 | 2686 | 2121 | 2467 | 2775 | 4234 | 3094 | 1948 | 1417 | 1118 | 899 | 880 | 988 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SW 16 | — | — | — | — | — | SW 16 | — | — | W 20 | W 18 | WSW 18 | WSW 16 | W 16 | W 15 |
— | — | — | — | 90 | — | — | — | — | — | 694 | — | — | 7 | 25 | 60 | 87 | 126 | 110 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 4 | NNE 4 | N 4 | N 3 | NNW 4 | NW 5 |
— | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 6 | 3 | 5 | 16 | 74 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 251 | 2 | 2 | 0 | 34 | 89 | 1 | 20 | 20 | 0 | 0 | 1 | 0 | 13 | 0 | 0 | 44 | 53 | 53 |
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.










