Cathedral Rock surfForecast / WA – Rottnest Island / Australia

information circle12 Day Weather and Surf, issued 7 am Thursday 18 Dec 2025 AWST
Forecast update in hr  min  s Forecast update imminent
Cathedral Rock surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cathedral Rock sea temperature is
22.4° C
(Which is 1.9°C warmer than normal for this time of year)


Best Forecast Surf Conditions for Cathedral Rock this week:

The surf forecast for Cathedral 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 1.0m and 11s period with a secondary swell of 0.2m and 17s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Cathedral Rock in the next 12 days are 2.2m 14s 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 1.9m 6s period and expected on Friday (Dec 19) at 8PM.

Wave TypeTime (AWST) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Fri 19th Dec)3.5ft (1.0m) 11s
Best Surf11AM (Tue 23rd Dec)5ft (1.6m) 14s
Most Powerful 5PM (Mon 22nd Dec)7ft (2.2m) 14s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Warm (max 23°C on Thu night, min 16°C on Thu morning). Winds increasing (moderate winds from the S on Fri morning, near gales from the S by Fri night).

Days 3-6 Weather Summary Mostly dry. Warm (max 30°C on Tue night, min 17°C on Sun morning). Mainly strong winds.

Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
1
0
0
0
0
0
0
0
1
2
0
0
0
1
3
3
1
0
0
0
1
Swell
Height Map
Wave Height (m) & direction (?)
1.6
SW
1.8
SW
1.3
SW
0.9
SW
0.2
WSW
2.4
SSW
1.4
SSW
2.1
SW
1.5
SW
1.4
WSW
1.8
SW
1.1
WSW
1.3
WSW
2.2
SW
1.5
WSW
1.6
SW
1.4
WSW
1.2
WSW
1.1
SW
1
WSW
1
WSW
Period(s) (?)1012911167768131313131416141413131212
Wave
Graph
(?)Metric surfscale
Energy kJ (?)510855269172256112083383196491053402596198311121031763458388314278
Wind
(km/h)
20
S
40
SSW
35
ESE
20
S
45
SSW
50
S
40
S
50
SSW
35
ESE
15
SSW
40
SSW
40
SSE
30
S
45
SSW
35
ESE
15
SE
30
S
40
E
30
E
30
ENE
20
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
offcross-
off
cross-
off
offcross-
off
cross-
off
offoffcross-
off
cross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
8:01PM
1.03
8:29PM
1.08
8:57PM
1.09
9:24PM
1.06
9:52PM
0.99
10:22PM
0.89
10:53PM
0.77
Low Tide
/ height (m)
5:33AM
0.29
6:03AM
0.29
6:36AM
0.28
7:10AM
0.26
7:42AM
0.23
8:10AM
0.22
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Sunrise5:07--5:07--5:07--5:07--5:07--5:09--5:09--
Sunset-7:21--7:22--7:22--7:22--7:22--7:23--7:23-
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
cloud
cloud
clear
Rain (mm)
---------------------
Temp. °C202023212121192023192020212123252530252829
Feels °C (?)161415181614131115151313161516222025192324
  • Map Icons:
  • Break
  • 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 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 12 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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