Surf Forecasts:
Portsea Back Beach surf forecast from 4 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 4PM (local time) - 7ft (2.1m), 17s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 4PM (local time) - 13ft (4.0m), 19s period, SW swell with 11,156 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 1AM (local time) - 5.5ft (1.7m), 14s period with SW swell.
Best Forecast Surf Conditions for Portsea Back Beach this week:
The surf forecast for Portsea Back Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 1AM. The primary swell is predicted to be 1.7m and 14s period with a secondary swell of 0.7m and 20s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Portsea Back Beach in the next 16 days are 4.0m 19s and forecast to arrive on Wednesday (Sep 09) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Saturday (Sep 05) at 7AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 8th Sep) | 5.5ft (1.7m) 14s |
| Best Surf | 4PM (Tue 8th Sep) | 7ft (2.1m) 17s |
| Most Powerful | 4PM (Wed 9th Sep) | 13ft (4.0m) 19s |
Table - best surf conditions forecast for Portsea Back Beach over the next 16 days.
Short Range ForecastModerate rain (total 12mm), heaviest on Fri night. Very mild (max 16°C on Sat morning, min 10°C on Mon afternoon). Winds decreasing (strong winds from the N on Fri night, light winds from the SW by Sun afternoon). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Very mild (max 13°C on Tue afternoon, min 7°C on Mon night). Winds increasing (calm on Mon night, strong winds from the SW by Tue night). | ||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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) | SW 16 | SW 15 | SW 15 | SW 11 | SW 14 | SW 14 | SW 13 | SW 12 | SW 13 | SW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SW 19 | SW 18 | SW 17 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 3544 | 2437 | 2021 | 4595 | 2004 | 1236 | 629 | 292 | 851 | 1115 | 1006 | 2442 | 2203 | 6673 | 11156 | 10265 | 7658 | 5522 | 3725 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | glassy | cross | glassy | cross-on | cross-on | cross-on | on | on | on | cross-on |
High Tide | 5:09AM1.45m | 4:33PM1.42m | 6:00AM1.38m | 5:17PM1.37m | 6:59AM1.31m | 6:13PM1.30m | 8:07AM1.24m | 7:28PM1.23m | 9:24AM1.22m | 8:58PM1.19m | 10:41AM1.24m | 10:31PM1.22m | |||||||
Low Tide | 10:31PM0.12m | 10:53AM0.62m | 11:16PM0.13m | 11:38AM0.68m | 00:08AM0.18m | 12:33PM0.74m | 1:09AM0.25m | 1:44PM0.76m | 2:23AM0.32m | 3:11PM0.74m | 3:47AM0.36m | 4:42PM0.65m | |||||||
 |  |  |  |  |  |  | | |  | | | | | | | | | | |
 | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — |
 | — | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — |
mm | 7 | 3 | — | 2 | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — |
Temp °C | 15 | 16 | 14 | 13 | 14 | 13 | 13 | 12 | 11 | 10 | 11 | 13 | 11 | 11 | 11 | 11 | 10 | 11 | 11 |
Feels °C | 9 | 9 | 6 | 5 | 11 | 10 | 9 | 7 | 6 | 7 | 9 | 11 | 6 | 2 | 3 | 3 | 5 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | — | SW 14 | SW 14 | SW 13 | SW 12 | SW 13 | SW 14 | SW 13 | SW 17 | SW 16 | SW 22 | SW 19 | SW 18 | SW 17 | SW 16 | SW 16 |
| kJ | 3544 | 2437 | 2021 | — | 2004 | 1236 | 629 | 292 | 851 | 1115 | 721 | 2442 | 2203 | 584 | 11156 | 10265 | 7658 | 5522 | 3725 |
Swell 2 Height (m) Direction Period (s) | S 18 | S 16 | SSW 17 | — | S 7 | WSW 18 | — | SW 22 | SW 21 | SW 20 | SW 18 | SW 13 | S 15 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | S 15 |
| kJ | 162 | 127 | 95 | — | 143 | 31 | — | 18 | 69 | 377 | 1006 | 591 | 115 | 354 | 608 | 835 | 510 | 437 | 224 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SW 20 | — | — | S 22 | S 20 | SSW 20 | SSW 18 | — | — | SSW 22 | — | — | — | — | — |
| kJ | — | — | — | — | 15 | — | — | 9 | 8 | 37 | 61 | — | — | 92 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 4 | N 5 | WNW 5 | SW 11 | S 7 | S 7 | SW 5 | SW 6 | S 6 | — | — | — | SW 6 | SW 16 | — | — | — | — | — |
| kJ | 25 | 68 | 91 | 4595 | 209 | 76 | 65 | 145 | 52 | — | — | — | 52 | 6673 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 17 | 403 | 489 | 289 | 25 | 27 | 31 | 357 | 43 | 0 | 13 | 0 | 31 | 597 | 1512 | 31 | 31 | 266 | 17 |
Best forecast wave conditions in Mornington Peninsula | |||||||||||||||||||
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 Portsea Back Beach 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 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 16 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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