Cat Bay (Shelly Beach) surf break

Cat Bay (Shelly Beach) surfForecast / VIC – Phillip Island / Australia

information circle12 Day Weather and Surf, issued 9 am Wednesday 09 Jul 2025 AEST
Forecast update in hr  min  s Forecast update imminent
Cat Bay (Shelly Beach) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cat Bay (Shelly Beach) sea temperature is
13.2° C
(Which is normal for this time of year)


Best Forecast Surf Conditions for Cat Bay (Shelly Beach) this week:

The surf forecast for Cat Bay (Shelly Beach) over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Jul 12) at 4PM. The primary swell is predicted to be 2.0m and 13s period with a secondary swell of 1.1m and 17s. Another secondary swell of 0.5m and 3s is also forecast. The wind is predicted to be onshore as the swell arrives.

The most powerful waves expected at Cat Bay (Shelly Beach) in the next 12 days are 3.5m 16s and forecast to arrive on Thursday (Jul 10) at 7PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 4PM (Sat 12th Jul)6.5ft (2.0m) 13s
Best Surf 4PM (Sat 12th Jul)6.5ft (2.0m) 13s
Most Powerful 7PM (Thu 10th Jul)11ft (3.5m) 16s

Table - best surf conditions forecast for Cat Bay (Shelly Beach) over the next 12 days.

Updates in  hr  min  s Forecast update imminent
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
2.5
SW
2.3
SW
1.9
SW
1.5
SW
4
SW
3
SW
2.2
SW
2
SW
2.1
SW
2.2
SW
2
SW
2.1
SW
1.8
SW
1.9
SW
4
SW
3
SW
2.4
SW
1.9
SW
1.6
SW
1.9
SW
2.3
SW
2.4
SW
2.4
SW
2.5
SW
2.3
SW
2.3
SW
1.9
SW
3.5
WSW
4
SW
4
SW
3
SW
3
SW
2.3
SW
2.1
SW
1.8
SW
1.6
SW
Period(s) (?)171614131115141411131316151412131312121312121213141319141717161615141414
Wave
Graph
(?)Metric surfscale
Energy (?)3702270415031162344935172023300715461802221022951459141251685324201211409181233155516941797239128683314455270918975866747663738240019871456995
Wind
(km/h)
35
NNW
45
N
45
N
45
W
50
WSW
35
NW
40
WNW
40
WSW
20
W
25
NW
20
NW
35
NNW
50
NNW
50
NNW
55
WSW
35
SW
30
W
30
WNW
30
NW
35
W
35
NW
40
NW
40
WNW
30
WNW
40
NW
35
WNW
30
NW
40
NNW
35
NW
30
NW
30
NW
35
NNW
25
N
40
N
30
N
30
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
oncross-
on
oncross-
on
crosscross-
on
cross-
on
crosscross-
on
onononononcrosscross-
off
crosscross-
on
oncross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
ononcross-
on
cross-
on
ononcross-
on
ononcross-
on
High Tide
/ height (m)
10:34AM
1.97
9:38PM
1.81
11:32AM
2.03
10:38PM
1.80
12:25PM
2.11
11:37PM
1.82
1:12PM
2.19
12:34AM
1.87
1:54PM
2.27
1:28AM
1.93
2:32PM
2.34
2:19AM
2.00
3:08PM
2.39
3:09AM
2.08
3:43PM
2.41
3:59AM
2.15
4:19PM
2.41
4:49AM
2.20
4:56PM
2.39
5:41AM
2.23
5:35PM
2.35
6:36AM
2.24
6:17PM
2.29
Low Tide
/ height (m)
4:20PM
1.21
4:28AM
0.48
5:24PM
1.19
5:22AM
0.44
6:22PM
1.13
6:14AM
0.39
7:13PM
1.04
7:03AM
0.34
7:59PM
0.92
7:49AM
0.32
8:41PM
0.79
8:33AM
0.32
9:20PM
0.64
9:17AM
0.36
10:00PM
0.49
10:01AM
0.43
10:40PM
0.36
10:46AM
0.53
11:22PM
0.24
11:34AM
0.66
12:07AM
0.17
12:24PM
0.79
12:56AM
0.13
Wednesday
09
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Sunrise7:35--7:35--7:35--7:35--7:35--7:33--7:33--7:33--7:33--7:31--7:31--7:31--
Sunset-5:12--5:13--5:14--5:14--5:15--5:15--5:15--5:16--5:17--5:17--5:19--5:20-
part cloudcloudmod rainrain showerslight rainrain showerspart cloudrain showerspart cloudpart cloudpart cloudclearpart cloudlight rainrain showerscloudlight rainpart cloudpart cloudrain showerspart cloudpart cloudlight rainmod rainlight rainlight rainrain showerslight rainclearpart cloudpart cloudcloudclearpart cloudpart cloudpart cloud
Rain (mm)
--6331-1-----15-2--1--162471--------
Temp. °C11111111121213131312151215161111109121211131312131312121312121313141514
Feels °C (?)311115556611655-3321543456666467668687

Short Range Forecast: Moderate rain (total 14mm), heaviest on Wed night. Very mild (max 13°C on Fri morning, min 9°C on Wed morning). Winds decreasing (near gales from the WSW on Thu morning, moderate winds from the W by Fri night).

Days 3-6 Weather Summary Light rain (total 8mm), mostly falling on Sun night. Very mild (max 16°C on Sun afternoon, min 8°C on Mon night). Winds increasing (moderate winds from the NW on Sat afternoon, gales from the W by Sun night).

Days 6-9 Weather Summary Heavy rain (total 21mm), heaviest during Thu night. Very mild (max 13°C on Wed morning, min 10°C on Tue morning). Mainly strong winds.

Long Range Forecast: Some drizzle, heaviest during Fri morning. Very mild (max 15°C on Sun afternoon, min 11°C on Fri morning). Mainly strong winds.

  • Map Icons:
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  • 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 Cat Bay (Shelly Beach) Surf forecast

The above surf forecast table for Cat Bay (Shelly Beach) provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Cat Bay (Shelly Beach) can be found by selecting the local surf guide option on the grey menu. Our Cat Bay (Shelly Beach) 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 (Cat Bay (Shelly Beach)) 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 Cat Bay (Shelly Beach) 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.

Cat Bay is 34 km (21 miles) from Mornington. If you plan a holiday in Phillip Island, look for hotels and other accommodation in Mornington. Mornington has rooms for a wide range of budgets as well as car hire and transport links.

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