Surf Forecasts:
Portsea Back Beach surf forecast from 24 Aug 2026:
- Best quality surf: Monday 31 Aug, 4AM (local time) - 8ft (2.4m), 19s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 31 Aug, 7AM (local time) - 8ft (2.5m), 18s period, SW swell with 4,038 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 1AM (local time) - 5ft (1.6m), 13s 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 (Aug 25) at 1AM. The primary swell is predicted to be 1.6m and 13s period with a secondary swell of 0.3m 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 18s and forecast to arrive on Monday (Aug 31) at 7AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Tuesday (Aug 25) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 25th Aug) | 5ft (1.6m) 13s |
| Best Surf | 4AM (Mon 31st Aug) | 8ft (2.4m) 19s |
| Most Powerful | 7AM (Mon 31st Aug) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Portsea Back Beach over the next 16 days.
Short Range ForecastModerate rain (total 15mm), heaviest on Mon night. Very mild (max 16°C on Mon afternoon, min 8°C on Thu morning). Winds increasing (light winds from the ENE on Tue morning, fresh winds from the SW by Tue night). | Days 5-7 Weather SummaryMostly dry. Very mild (max 15°C on Thu afternoon, min 10°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 13 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 | SW 18 | SW 17 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 18 |
Wave Graph  | ||||||||||||||||||||
 kJ | 704 | 777 | 969 | 851 | 1163 | 1688 | 991 | 802 | 338 | 410 | 546 | 1136 | 2136 | 1552 | 1006 | 821 | 444 | 473 | 688 | 1227 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | on | on | on | on | cross-on | cross | cross-off | cross | cross | cross | glassy | glassy | cross-on | on | cross-on | cross-on | glassy |
High Tide | 6:56PM1.18m | 8:59AM1.18m | 7:55PM1.11m | 10:06AM1.18m | 9:09PM1.07m | 11:09AM1.20m | 10:26PM1.08m | 12:01PM1.24m | 11:37PM1.13m | 12:43PM1.28m | 00:36AM1.22m | 1:18PM1.33m | 1:27AM1.32m | |||||||
Low Tide | 1:53AM0.39m | 2:32PM0.84m | 2:52AM0.41m | 3:52PM0.82m | 3:59AM0.41m | 5:11PM0.75m | 5:06AM0.39m | 6:08PM0.65m | 6:06AM0.36m | 6:51PM0.54m | 6:56AM0.34m | 7:28PM0.44m | ||||||||
 |  |  | |  |  | |  |  | | | | | | | | | | | | |
 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | 6:47 | — | — |
 | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:57 | — |
mm | — | 11 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 12 | 13 | 12 | 12 | 12 | 11 | 11 | 15 | 13 | 13 | 12 | 12 | 13 | 13 | 12 | 12 | 13 | 12 |
Feels °C | 12 | 12 | 11 | 11 | 7 | 7 | 7 | 7 | 8 | 12 | 10 | 11 | 10 | 12 | 12 | 11 | 11 | 10 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 13 | WSW 13 | SW 17 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 |
| kJ | 704 | 777 | 969 | 851 | 1163 | 1336 | 991 | 802 | 338 | 410 | 494 | 784 | 2136 | 1552 | 1006 | 821 | 444 | 473 | 688 | 933 |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 18 | WSW 17 | SW 16 | — | S 15 | — | SW 16 | SW 15 | SW 21 | SW 19 | SW 18 | S 17 | S 16 | SSW 15 | SW 24 | SW 22 | SW 17 | SW 20 | SW 18 |
| kJ | 15 | 50 | 197 | 381 | — | 4 | — | 91 | 76 | 117 | 546 | 1136 | 53 | 45 | 21 | 22 | 73 | 137 | 134 | 1227 |
Swell 3 Height (m) Direction Period (s) | — | S 14 | — | ESE 4 | — | — | — | W 24 | WSW 22 | S 22 | S 20 | S 18 | — | — | — | — | SSW 8 | SW 20 | S 15 | SW 4 |
| kJ | — | 14 | — | 10 | — | — | — | 11 | 48 | 9 | 7 | 25 | — | — | — | — | 6 | 98 | 116 | 5 |
Wind waves Height (m) Direction Period (s) | NNE 3 | NE 3 | ESE 4 | SE 4 | SW 5 | SW 14 | — | — | WNW 2 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | 9 | 9 | 47 | 1688 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 7 | 0 | 0 | 27 | 45 | 45 | 213 | 13 | 7 | 0 | 7 | 25 | 4 | 0 | 0 | 4 | 25 | 13 | 35 | 0 |
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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