Surf Forecasts:
Portsea Back Beach surf forecast from 18 Aug 2026:
- Best quality surf: Sunday 23 Aug, 4PM (local time) - 7ft (2.1m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 4AM (local time) - 8ft (2.5m), 16s period, WSW swell with 3,480 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 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 Sunday (Aug 23) at 1PM. The primary swell is predicted to be 2.1m and 14s period with a secondary swell of 0.8m and 18s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Portsea Back Beach in the next 16 days are 2.5m 16s and forecast to arrive on Saturday (Aug 22) 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 1.4m 5s period and expected on Wednesday (Aug 19) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Sun 23rd Aug) | 7ft (2.1m) 14s |
| Best Surf | 4PM (Sun 23rd Aug) | 7ft (2.1m) 16s |
| Most Powerful | 4AM (Sat 22nd Aug) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Portsea Back Beach over the next 16 days.
Short Range ForecastLight rain (total 7mm), mostly falling on Tue night. Very mild (max 15°C on Tue night, min 11°C on Wed night). Winds decreasing (strong winds from the N on Wed morning, light winds from the NW by Thu afternoon). | Days 5-7 Weather SummarySome drizzle, heaviest during Mon afternoon. Very mild (max 17°C on Mon morning, min 9°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 15 | SW 15 | SW 15 | SW 15 | SW 18 | WSW 13 | SW 16 | SW 15 | SW 14 | WSW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 465 | 255 | 239 | 217 | 155 | 282 | 306 | 675 | 614 | 3436 | 3011 | 2553 | 2247 | 1891 | 2157 | 1622 | 1063 | 1052 | 1173 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-on | on |
High Tide | 4:18AM1.48m | 4:10PM1.50m | 5:00AM1.44m | 4:40PM1.46m | 5:41AM1.39m | 5:09PM1.40m | 6:23AM1.32m | 5:39PM1.33m | 7:08AM1.26m | 6:12PM1.26m | 7:59AM1.21m | 6:56PM1.18m | |||||||
Low Tide | 10:12AM0.47m | 10:36PM0.22m | 10:48AM0.56m | 11:11PM0.24m | 11:22AM0.65m | 11:46PM0.28m | 11:57AM0.73m | 00:23AM0.32m | 12:37PM0.79m | 1:04AM0.36m | 1:27PM0.83m | 1:53AM0.39m | |||||||
 |  |  | |  | |  |  | | | | | |  | | | | |  | |
 | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — |
 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — |
mm | 2 | 2 | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 10 |
Temp °C | 15 | 13 | 13 | 14 | 14 | 14 | 12 | 14 | 14 | 12 | 13 | 13 | 13 | 13 | 16 | 14 | 17 | 17 | 11 |
Feels °C | 11 | 4 | 6 | 8 | 10 | 11 | 8 | 10 | 10 | 8 | 9 | 10 | 9 | 10 | 14 | 9 | 11 | 12 | 4 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | WSW 13 | SW 16 | SW 15 | SW 14 | WSW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 16 | SW 16 | SW 14 | SW 14 | SW 13 |
| kJ | 465 | 255 | 239 | 217 | 147 | 282 | 306 | 675 | 614 | 2631 | 3011 | 2553 | 2247 | 1891 | 2157 | 1622 | 1063 | 1052 | 1173 |
Swell 2 Height (m) Direction Period (s) | SE 4 | ESE 7 | SE 7 | SW 20 | SW 18 | SW 17 | WSW 13 | SW 20 | WSW 6 | SSW 17 | SW 24 | SSW 16 | SW 19 | SW 18 | WSW 16 | SSW 16 | SW 22 | SW 21 | SW 19 |
| kJ | 3 | 5 | 2 | 61 | 155 | 173 | 147 | 99 | 66 | 58 | 22 | 84 | 446 | 777 | 933 | 47 | 18 | 17 | 93 |
Swell 3 Height (m) Direction Period (s) | SSW 15 | SW 15 | S 16 | ESE 7 | WSW 9 | S 16 | SW 7 | SW 20 | SW 18 | — | — | — | SW 20 | SSW 14 | SSW 16 | — | SW 21 | WSW 21 | SW 19 |
| kJ | 23 | 9 | 5 | 5 | 30 | 5 | 12 | 98 | 330 | — | — | — | 190 | 38 | 53 | — | 18 | 43 | 94 |
Wind waves Height (m) Direction Period (s) | NNE 4 | N 5 | NNE 5 | NNW 4 | WNW 4 | NW 3 | WNW 4 | W 7 | WSW 7 | WSW 16 | — | — | — | NW 3 | — | NNW 4 | NNW 4 | NW 4 | — |
| kJ | 13 | 52 | 100 | 15 | 16 | 3 | 15 | 159 | 163 | 3436 | — | — | — | 3 | — | 11 | 19 | 15 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 17 | 63 | 48 | 17 | 13 | 17 | 13 | 27 | 25 | 27 | 27 | 17 | 25 | 17 | 0 | 17 | 17 | 27 | 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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