Cat Bay (Shelly Beach) surf break

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

information circle12 Day Weather and Surf, issued 3 am Thursday 31 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
12.7° 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 Thursday (Jul 31) at 10AM. The primary swell is predicted to be 1.1m and 13s period with a secondary swell of 0.4m and 8s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Cat Bay (Shelly Beach) in the next 12 days are 2.0m 17s and forecast to arrive on Tuesday (Aug 05) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Sunday (Aug 03) at 4AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+)10AM (Thu 31st Jul)3.5ft (1.1m) 13s
Best Surf 1PM (Fri 1st Aug)6ft (1.9m) 16s
Most Powerful10PM (Tue 5th Aug)6.5ft (2.0m) 17s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Very mild (max 13°C on Sat afternoon, min 9°C on Thu night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Very mild (max 17°C on Mon afternoon, min 9°C on Sun morning). Winds increasing (light winds from the NE on Sun afternoon, fresh winds from the N by Mon night).

Thursday
31
Friday
01
Saturday
02
Sunday
03
Monday
04
Tuesday
05
Wednesday
06
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.1
SW
1
SW
1.6
SW
1.9
SW
1.8
SW
1.9
SW
2
SW
1.8
SW
1.7
SW
1.3
SW
1.1
SW
0.9
SW
1.3
WSW
1
WSW
1.2
SW
1.3
WSW
1.4
SW
2
WSW
1.7
SW
1.4
SW
1.5
WSW
Period(s) (?)131317161615151414131313151416141816161413
Wave
Graph
(?)Metric surfscale
Energy (?)47459916452085183317731822154111635774374207256918881334230021851481894800
Wind
(km/h)
10
SE
15
SSE
10
E
10
NE
15
SSE
15
ESE
25
ESE
30
SE
20
NE
15
N
5
NE
15
NNE
25
NNE
25
N
40
N
30
NW
20
W
20
N
35
NNW
20
NW
20
NNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offoffcross-
off
crossoffcross-
off
cross-
off
cross-
off
crosscross-
on
crosscross-
on
cross-
on
onononcross-
on
onononon
High Tide
/ height (m)
4:14PM
2.33
4:49AM
2.13
4:46PM
2.27
5:31AM
2.10
5:18PM
2.19
6:13AM
2.05
5:51PM
2.11
6:57AM
2.00
6:26PM
2.03
7:47AM
1.95
7:04PM
1.95
8:43AM
1.92
7:49PM
1.87
Low Tide
/ height (m)
10:03AM
0.56
10:36PM
0.37
10:42AM
0.67
11:13PM
0.36
11:20AM
0.78
11:49PM
0.38
11:58AM
0.89
12:26AM
0.41
12:39PM
1.00
1:06AM
0.45
1:24PM
1.10
1:52AM
0.49
2:19PM
1.19
2:44AM
0.51
Thursday
31
Friday
01
Saturday
02
Sunday
03
Monday
04
Tuesday
05
Wednesday
06
Sunrise7:22--7:20--7:20--7:20--7:18--7:18--7:16--
Sunset-5:29--5:30--5:30--5:30--5:31--5:32--5:34-
cloudpart cloudclearpart cloudcloudpart cloudpart cloudclearclearclearclearclearclearpart cloudpart cloudclearpart cloudclearclearcloudrain showers
Rain (mm)
--------------------1
Temp. °C111110101111121310131514151715141413141513
Feels °C (?)875877776101310101278998108
  • 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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Eyeball surf reportRecent Eyeball Surf Reports for VIC - Phillip Island

  1. weather stationWind Update Continuing clean conditions at Cat Bay (Shelly Beach) (light winds from the ESE at Rhyll 16 km from Cat Bay (Shelly Beach)). 0.8m 13s groundswell from the SSW with a 0.3m 21s long period groundswell from the SW. 2 swells combining to make bigger set waves.

    Cat Bay (Shelly Beach)
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16 km away, 1 h 48 min ago

7 km/h
ESE
0.0
12.7
Air / Water (°C)
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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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