Portsea Back Beach surf break

Portsea Back Beach surfForecast / VIC – Mornington Peninsula / Australia

information circle12 Day Weather and Surf, issued 3 am Friday 11 Jul 2025 AEST
Forecast update in hr  min  s Forecast update imminent
Portsea Back Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Portsea Back Beach sea temperature is
13.9° C
(Which is slightly warmer than usual)


Best Forecast Surf Conditions for Portsea Back Beach this week:

The surf forecast for Portsea Back Beach over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Jul 11) at 7PM. The primary swell is predicted to be 2.4m and 11s period with a secondary swell of 1.3m and 14s. Another secondary swell of 0.1m and 22s is also forecast. The wind is predicted to be cross-onshore as the swell arrives.

The most powerful waves expected at Portsea Back Beach in the next 12 days are 3.0m 19s and forecast to arrive on Friday (Jul 18) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Sunday (Jul 13) at 10AM.

Wave TypeTime (AEST) & Date Wave Height & Period
Next good surf (1 star+) 7PM (Fri 11th Jul)8ft (2.4m) 11s
Best Surf 7AM (Mon 14th Jul)11ft (3.5m) 13s
Most Powerful 1AM (Fri 18th Jul)10ft (3.0m) 19s

Table - best surf conditions forecast for Portsea Back Beach over the next 12 days.

Updates in  hr  min  s Forecast update imminent
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
2.2
SW
3
SW
2.5
SW
2.3
SW
2.2
SW
2.2
SW
1.8
SW
1.8
SW
4
SW
3
SW
2.5
SW
2.1
SW
1.7
SW
1.9
SW
2.1
SW
2.3
SW
2.4
SW
2.2
SW
2.5
SW
3
SW
3
SW
2.5
SW
2.5
SW
3.5
SW
3.5
SW
3.5
SW
3
SW
2.4
SW
2.2
SW
1.7
SW
1.4
SW
1.3
SW
1.2
SW
1.6
WSW
2.1
WSW
3.5
WSW
Period(s) (?)14131313131615141414141312812111214131419181716161717161615141413141615
Wave
Graph
(?)Metric surfscale
Energy (?)2047286621872116256424101458128051923341225715619348521252152919072033282247546682471745436266571260665265296824261292851646521165521076866
Wind
(km/h)
35
WNW
25
SW
20
WNW
20
WNW
10
NW
30
N
45
N
50
NW
30
W
30
WNW
20
WNW
25
NW
30
W
20
WSW
30
WNW
30
WNW
30
WNW
25
WNW
25
N
25
N
35
N
40
NW
35
W
35
WNW
35
WSW
35
WSW
15
W
15
NNW
15
NE
25
N
35
N
40
NNE
30
N
40
NNE
40
NNE
40
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crossoncross-
on
crosscross-
off
cross-
off
cross-
off
crosscross-
on
cross-
on
cross-
on
crosscross-
on
oncrosscrosscrosscrosscross-
off
cross-
off
cross-
off
crosscross-
on
cross-
on
cross-
on
oncross-
on
cross-
off
offcross-
off
cross-
off
cross-
off
cross-
off
offcross-
off
cross-
off
High Tide
/ height (m)
12:29PM
1.42
11:16PM
1.20
1:14PM
1.46
12:14AM
1.21
1:54PM
1.48
1:10AM
1.25
2:30PM
1.50
2:03AM
1.29
3:04PM
1.50
2:55AM
1.34
3:37PM
1.50
3:46AM
1.38
4:10PM
1.50
4:38AM
1.41
4:45PM
1.49
5:33AM
1.42
5:22PM
1.48
6:32AM
1.42
6:03PM
1.46
7:35AM
1.40
6:51PM
1.42
8:44AM
1.39
7:48PM
1.37
Low Tide
/ height (m)
6:27PM
0.84
6:05AM
0.27
7:16PM
0.77
6:54AM
0.24
7:58PM
0.69
7:42AM
0.23
8:36PM
0.60
8:27AM
0.25
9:12PM
0.52
9:11AM
0.29
9:50PM
0.44
9:54AM
0.37
10:29PM
0.36
10:37AM
0.46
11:11PM
0.30
11:23AM
0.57
11:57PM
0.26
12:12PM
0.68
12:48AM
0.24
1:08PM
0.79
1:45AM
0.23
2:13PM
0.86
2:48AM
0.24
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Sunrise7:37--7:35--7:35--7:35--7:35--7:35--7:33--7:33--7:33--7:31--7:31--7:31--
Sunset-5:15--5:16--5:16--5:17--5:19--5:19--5:20--5:21--5:21--5:22--5:22--5:23-
part cloudrain showerspart cloudclearpart cloudpart cloudpart cloudrain showersrain showerspart cloudcloudpart cloudlight rainclearpart cloudpart cloudpart cloudrain showerslight raincloudpart cloudpart cloudlight rainrain showersrain showerspart cloudclearclearclearpart cloudcloudrain showersclearcloudpart cloudmod rain
Rain (mm)
-1-----31---3----11---412------1---7
Temp. °C1413121415131514991091011101314121415131312111111109119111010131512
Feels °C (?)77710128541252563676995654225563322361

Short Range Forecast: Light rain (total 5mm), mostly falling on Sun afternoon. Very mild (max 15°C on Sat afternoon, min 8°C on Sun night). Winds increasing (light winds from the NW on Sat afternoon, strong winds from the NW by Sun afternoon).

Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Tue morning. Very mild (max 14°C on Wed afternoon, min 7°C on Mon night). Mainly fresh winds.

Days 6-9 Weather Summary Light rain (total 8mm), mostly falling on Fri afternoon. Very mild (max 15°C on Thu afternoon, min 8°C on Sat night). Winds decreasing (strong winds from the W on Fri night, light winds from the NW by Sat night).

Long Range Forecast: Light rain (total 8mm), mostly falling on Tue night. Very mild (max 15°C on Tue afternoon, min 7°C on Sun morning). Winds increasing (light winds from the NNW on Sun morning, near gales from the NNE by Tue night).

  • 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 Portsea Back Beach Surf forecast

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

Portsea Back Beach is 29 km (18 miles) from Geelong. If you plan a holiday in Mornington Peninsula, look for hotels and other accommodation in Geelong. Geelong has rooms for a wide range of budgets as well as car hire and transport links.

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