Surf Forecasts:
Cow Bombie surf forecast from 17 Aug 2026:
- Best quality surf: Saturday 22 Aug, 5AM (local time) - 10ft (3.0m), 17s period, SW swell with offshore winds.
- Most powerful swell: Tuesday 18 Aug, 8AM (local time) - 15ft (4.5m), 16s period, WSW swell with 10,598 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 2AM (local time) - 11ft (3.5m), 15s period with SW swell.
Best Forecast Surf Conditions for Cow Bombie this week:
The surf forecast for Cow Bombie over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 2AM. The primary swell is predicted to be 3.5m and 15s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Cow Bombie in the next 16 days are 4.5m 16s and forecast to arrive on Tuesday (Aug 18) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 21st Aug) | 11ft (3.5m) 15s |
| Best Surf | 5AM (Sat 22nd Aug) | 10ft (3.0m) 17s |
| Most Powerful | 8AM (Tue 18th Aug) | 15ft (4.5m) 16s |
Table - best surf conditions forecast for Cow Bombie over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get stuck into what’s in store for this classic spot.
We’ve got one break on the radar for the next 16 days: Cow Bombie (reef). It’s an exposed, advanced-only wave that doesn’t break often, but when it does, it’s a proper beast. This is a place for the experienced crew only.
The forecast kicks off with a serious pulse of south-west swell. The water is sitting at 66.6°F which is a touch warmer than normal for this time of year, so that’s a nice bonus.
Tuesday, 18 August is a right-off for us. The morning is cloudy with a moderate breeze from the WNW at 12 mph and the swell is a solid 14.8 ft from the WSW with a very long period of 16 seconds. The combined energy is massive (10173), but the wind is onshore and the surf is described as marginal. The afternoon gets worse with a fresh breeze and cross-on conditions at 19 mph. Not worth paddling out.
Wednesday, 19 August is a write-off too. The morning is clear, but we have a cross-on wind from the SW at 12 mph. The swell hangs around 14.8 ft, WSW, with a long period. The energy is still huge (8250). The afternoon is a bit lighter with a gentle breeze, but still cross-on. It’s choppy and messy.
Thursday, 20 August stays poor. Morning and afternoon both have cross-on winds, with the swell dropping to 13.1 ft and then 11.5 ft. Combined energy is still moderate-to-strong (6829, then 6389). The wind is light, but the onshore direction ruins it.
Friday, 21 August – morning is the first real standout. The wind drops to dead calm, glassy conditions. The swell is 11.5 ft from the SW with a period of 14 seconds – that’s a long period groundswell. The energy is strong (4807). This is excellent surf for experienced surfers. The caveat: at a beach break, a long period swell like this can break a bit straight, but on a reef, this is properly solid and clean. The afternoon gets a gentle cross-on breeze, so the morning is the window.
Saturday, 22 August – morning is another standout. Glassy calm again, with a 9.8 ft SW swell at 16 seconds. That’s a very long period groundswell with a lot of energy (4128). The reef should handle this beautifully. The afternoon turns cross-shore with a light breeze, so the morning is the session.
Sunday, 23 August is a washout. Moderate cross-on winds at 16 mph, 7.9 ft swell, energy dropping to 2614. Poor conditions all day.
Monday, 24 August is poor. Cross-on winds, 9.8 ft in the morning dropping to 8.2 ft in the afternoon. Energy is moderate. Choppy and lumpy. Kite surfers might be interested, but for paddle surfing, it’s a no.
Tuesday, 25 August is a write-off. The morning has rain showers, a fresh breeze from the SW at 22 mph, and a messy 11.5 ft short-period swell (9 seconds). The afternoon sees the swell jump to 16.4 ft with a moderate breeze, but it’s cross-on and lumpy. Not surfable.
Wednesday, 26 August is marginal. Gentle cross-on breeze, 11.5 ft swell from the SW with a period of 13-14 seconds. Energy is still strong (5416). Choppy, but if you’re desperate, you could find a wave.
Thursday, 27 August is small. The swell drops to 7.2 ft in the morning and 6.2 ft in the afternoon. Light onshore and cross-shore winds. Energy is weak (1783, 1494). Not much to get excited about.
Friday, 28 August – morning is a highlight. Light offshore wind from the ENE at 6 mph, a 6.2 ft swell from the WSW with a very long period of 19 seconds. That’s a massive, long period groundswell. The energy is strong (3243). The conditions are clean. This is a proper session for the experts. The afternoon has a light cross-shore breeze, so the morning is the call.
Saturday, 29 August – afternoon
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Very mild (max 16°C on Tue night, min 13°C on Thu night). Winds decreasing (fresh winds from the WNW on Tue night, calm by Thu night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun morning. Very mild (max 16°C on Sat morning, min 13°C on Fri morning). Winds increasing (calm on Fri morning, fresh winds from the SW by Sun morning). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
AM | PM | 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 16 | WSW 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | WSW 14 | WSW 13 | SW 12 | SW 11 |
Wave Graph | |||||||||||||||||||||
10173 | 8820 | 6238 | 8250 | 10331 | 9256 | 6829 | 6389 | 5735 | 4720 | 4066 | 3280 | 4128 | 3441 | 1922 | 2067 | 1915 | 3174 | 2695 | 1890 | 1340 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | glassy | glassy | cross-on | cross-off | glassy | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | on |
High Tide | 00:37AM0.74m | 1:15AM0.78m | 2:08AM0.81m | 3:39AM0.84m | 5:28AM0.87m | 6:35AM0.90m | |||||||||||||||
Low Tide | 3:35PM0.38m | 3:25PM0.34m | 3:31PM0.30m | 3:41PM0.29m | 3:54PM0.28m | 4:05PM0.29m | 4:17PM0.29m | ||||||||||||||
6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | |
— | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | |
mm | — | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | 3 |
Temp °C | 15 | 15 | 16 | 16 | 15 | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 16 | 16 | 16 | 16 | 15 | 14 | 14 | 15 | 16 |
Feels °C | 10 | 10 | 10 | 11 | 11 | 12 | 12 | 12 | 13 | 14 | 13 | 11 | 15 | 14 | 13 | 10 | 9 | 9 | 11 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | — | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | WSW 14 | WSW 13 | SW 12 | WSW 12 |
10173 | 8820 | — | 8250 | 10331 | 9256 | 6829 | 6389 | 5735 | 4720 | 4066 | 3280 | 4128 | 3441 | 1922 | 2067 | 1915 | 3174 | 2695 | 1890 | 493 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 24 | SW 22 | SW 18 | — | — | WSW 20 | WSW 18 | WSW 16 | — | — | WSW 13 | SW 21 |
— | — | — | — | — | — | — | — | — | 87 | 372 | 1414 | — | — | 128 | 547 | 986 | — | — | 894 | 111 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 23 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 11 | — | |
Wind waves Height (m) Direction Period (s) | — | — | WSW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 11 |
— | — | 6238 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1340 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 221 | 252 | 221 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 18 | 1 | 410 | 1 | 1 | 1 | 306 | 410 |
Best forecast wave conditions in Margaret River | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Cow Bombie Surf forecast
The above surf forecast table for Cow Bombie provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cow Bombie can be found by selecting the local surf guide option on the grey menu. Our Cow Bombie 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 (Cow Bombie) 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 Cow Bombie 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.
Cow Bombie is 83 km (52 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.











