Surf Forecasts:
Portsea Back Beach surf forecast from 29 Aug 2026:
- Best quality surf: Monday 31 Aug, 10PM (local time) - 7.5ft (2.3m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 4 Sep, 4AM (local time) - 11ft (3.5m), 16s period, SW swell with 6,368 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 1PM (local time) - 7ft (2.1m), 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 Monday (Aug 31) at 1PM. The primary swell is predicted to be 2.1m and 14s period with a secondary swell of 0.8m and 19s. 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 3.5m 16s and forecast to arrive on Friday (Sep 04) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Tuesday (Sep 01) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Mon 31st Aug) | 7ft (2.1m) 14s |
| Best Surf | 10PM (Mon 31st Aug) | 7.5ft (2.3m) 17s |
| Most Powerful | 4AM (Fri 4th Sep) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Portsea Back Beach over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Tue night. Warm (max 20°C on Tue afternoon, min 9°C on Sun night). Winds increasing (calm on Mon morning, strong winds from the N by Tue morning). | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Fri night. Very mild (max 17°C on Fri afternoon, min 8°C on Thu night). Winds increasing (light winds from the NNE on Fri morning, fresh winds from the N by Fri night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
AM | PM | 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 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 16 | SW 15 | SW 15 | SW 14 | SW 15 | SW 15 | SW 14 | SW 13 | WSW 13 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1191 | 1306 | 1668 | 1729 | 1688 | 2475 | 1572 | 1025 | 1154 | 2048 | 2794 | 2509 | 2275 | 5105 | 5894 | 4978 | 4032 | 2832 | 2021 | 1808 | 1308 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross | cross | cross-on | on | cross | cross-off | cross-off | cross-off | cross | cross-on | on |
High Tide | 1:18PM1.33m | 1:27AM1.32m | 1:51PM1.36m | 2:12AM1.40m | 2:21PM1.40m | 2:56AM1.46m | 2:51PM1.42m | 3:39AM1.49m | 3:22PM1.44m | 4:22AM1.49m | 3:55PM1.44m | 5:09AM1.45m | 4:33PM1.42m | ||||||||
Low Tide | 7:28PM0.44m | 7:41AM0.35m | 8:03PM0.34m | 8:21AM0.37m | 8:37PM0.25m | 8:59AM0.42m | 9:13PM0.18m | 9:36AM0.48m | 9:50PM0.13m | 10:13AM0.54m | 10:31PM0.12m | 10:53AM0.62m | 11:16PM0.13m | ||||||||
 |  |  | | | | |  |  | | |  |  | | | | |  |  | |  | |
 | 6:47 | — | — | 6:46 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — |
 | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | 1 | — | — | — | — | 6 | 7 | 2 | — |
Temp °C | 12 | 11 | 10 | 11 | 13 | 13 | 19 | 20 | 16 | 13 | 14 | 14 | 15 | 15 | 11 | 14 | 17 | 15 | 14 | 13 | 12 |
Feels °C | 10 | 8 | 7 | 10 | 11 | 10 | 12 | 14 | 9 | 7 | 8 | 7 | 8 | 9 | 6 | 10 | 13 | 8 | 8 | 7 | 5 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 16 | SW 15 | SW 15 | SW 14 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 |
| kJ | 1191 | 1306 | 1668 | 1729 | 1688 | 2475 | 1572 | 1025 | 1154 | 2048 | 2794 | 2509 | 2275 | 3133 | 5894 | 4978 | 4032 | 2832 | 2021 | 1808 | 1308 |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 20 | SSW 15 | SW 20 | SW 19 | SSW 17 | SSW 16 | SSW 15 | SW 17 | SSW 17 | S 16 | SSW 15 | — | — | SSW 17 | S 16 | SSW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 |
| kJ | 137 | 134 | 71 | 196 | 520 | 97 | 50 | 88 | 290 | 95 | 137 | 71 | — | — | 476 | 186 | 212 | 61 | 97 | 57 | 48 |
Swell 3 Height (m) Direction Period (s) | SW 20 | WSW 20 | — | S 14 | S 13 | — | — | — | SSW 14 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 98 | 149 | — | 103 | 90 | — | — | — | 36 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | N 4 | NW 4 | W 4 | — | NW 3 | NW 4 | WNW 5 | WSW 13 | — | — | — | N 3 | N 3 | N 4 | SSW 5 |
| kJ | — | — | — | — | — | — | 42 | 58 | 37 | — | 5 | 36 | 77 | 5105 | — | — | — | 8 | 5 | 10 | 90 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 13 | 45 | 17 | 7 | 0 | 7 | 68 | 77 | 31 | 27 | 25 | 66 | 66 | 31 | 25 | 17 | 17 | 7 | 17 | 31 | 521 |
Best forecast wave conditions in Mornington Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
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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