Surf Forecasts:
Cathedral Rock surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 11PM (local time) - 10ft (3.0m), 16s period, WSW swell with cross-offshore winds.
- Most powerful swell: Tuesday 18 Aug, 5PM (local time) - 11ft (3.5m), 16s period, WSW swell with 5,641 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 11PM (local time) - 10ft (3.0m), 16s period with WSW swell.
Best Forecast Surf Conditions for Cathedral Rock this week:
The surf forecast for Cathedral Rock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 19) at 11PM. The primary swell is predicted to be 3.0m and 16s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cathedral Rock in the next 16 days are 3.5m 16s and forecast to arrive on Tuesday (Aug 18) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Aug 22) at 8PM.
| Wave Type | Time (AWST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 19th Aug) | 10ft (3.0m) 16s |
| Best Surf | 11PM (Wed 19th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 5PM (Tue 18th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Cathedral Rock over the next 16 days.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed morning. Very mild (max 17°C on Wed morning, min 15°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sun afternoon. Very mild (max 17°C on Fri afternoon, min 13°C on Sun night). Mainly strong winds. | ||||||||||||||||||||
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) | W 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 16 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 16 | WSW 14 | WSW 14 | WSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6079 | 5641 | 3863 | 2460 | 3424 | 4430 | 3594 | 2696 | 2459 | 2038 | 1822 | 1484 | 1975 | 1677 | 874 | 942 | 1030 | 2107 | 1321 | 1154 | 1127 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross | on | on |
High Tide | 00:56AM0.69m | 1:43AM0.77m | 2:45AM0.84m | 4:01AM0.91m | 5:17AM0.95m | 6:19AM0.98m | |||||||||||||||
Low Tide | 4:15PM0.31m | 4:07PM0.31m | 4:05PM0.34m | 4:03PM0.38m | 3:59PM0.41m | 3:57PM0.42m | 4:01PM0.41m | ||||||||||||||
 |  |  |  |  |  | | |  | | | | | |  | | | | | | | |
 | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:46 | — | — | 6:45 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — |
mm | — | — | — | 1 | — | 1 | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | 1 |
Temp °C | 16 | 16 | 16 | 17 | 17 | 17 | 15 | 16 | 16 | 14 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 13 | 16 | 17 |
Feels °C | 12 | 11 | 11 | 14 | 14 | 15 | 14 | 15 | 13 | 11 | 12 | 12 | 16 | 13 | 10 | 12 | 10 | 11 | 9 | 12 | 9 |
Swell 1 Height (m) Direction Period (s) | W 16 | WSW 16 | WSW 16 | WSW 15 | WSW 15 | WSW 16 | WSW 16 | WSW 16 | WSW 16 | WSW 15 | WSW 14 | WSW 14 | WSW 16 | WSW 16 | WSW 14 | WSW 14 | WSW 13 | WSW 16 | WSW 14 | WSW 14 | — |
| kJ | 6079 | 5641 | 3863 | 2460 | 3424 | 4430 | 3594 | 2696 | 2459 | 2038 | 1822 | 1484 | 1975 | 1393 | 874 | 942 | 1030 | 2107 | 1321 | 1154 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | W 24 | — | WSW 19 | — | — | WSW 21 | WSW 19 | WSW 18 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 11 | — | 630 | — | — | 44 | 363 | 662 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 16 | SSW 5 | SW 5 | — | — | — | — | WSW 13 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 1677 | 29 | 18 | — | — | — | — | 1127 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 309 | 355 | 309 | 173 | 173 | 0 | 0 | 0 | 0 | 0 | 144 | 3 | 0 | 1650 | 144 | 0 | 177 | 0 | 1 | 258 | 375 |
Best forecast wave conditions in Rottnest Island | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Cathedral Rock surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Cathedral Rock Surf forecast
The above surf forecast table for Cathedral Rock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cathedral Rock can be found by selecting the local surf guide option on the grey menu. Our Cathedral 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 (Cathedral 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 Cathedral 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.
Cathedral Rock is 31 km (19 miles) from the very large city of Fremantle. If you plan a holiday in Rottnest Island, look for hotels and other accommodation in Fremantle. Fremantle has rooms for a wide range of budgets as well as cheap car hire and transport links.
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