Surf Forecasts:
Portsea Back Beach surf forecast from 13 Sep 2026:
- Best quality surf: Friday 18 Sep, 1AM (local time) - 6ft (1.8m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 15 Sep, 7PM (local time) - 11ft (3.5m), 14s period, SW swell with 5,400 kJ wave energy.
- Next surfable swell (1★+): Friday 18 Sep, 1AM (local time) - 6ft (1.8m), 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 Friday (Sep 18) at 1AM. The primary swell is predicted to be 1.8m and 14s period with a secondary swell of 0.1m and 22s. 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 3.5m 14s and forecast to arrive on Tuesday (Sep 15) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 5s period and expected on Sunday (Sep 20) at 7AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Fri 18th Sep) | 6ft (1.8m) 14s |
| Best Surf | 1AM (Fri 18th Sep) | 6ft (1.8m) 14s |
| Most Powerful | 7PM (Tue 15th Sep) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Portsea Back Beach over the next 16 days.
Short Range ForecastLight rain (total 5mm), mostly falling on Sun night. Warm (max 21°C on Sun morning, min 10°C on Mon night). Winds increasing (light winds from the NW on Sun night, strong winds from the SW by Tue afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Fri morning, min 8°C on Thu night). Winds decreasing (fresh winds from the SSW on Wed morning, light winds from the SSW by Thu night). | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 11 | SW 13 | SW 14 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1108 | 1028 | 598 | 404 | 295 | 128 | 1432 | 4003 | 4729 | 3563 | 4079 | 3286 | 2090 | 1343 | 1215 | 1014 | 2259 | 1616 | 1304 | 1067 | 658 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 1:17PM1.41m | 1:47AM1.49m | 1:55PM1.45m | 2:32AM1.54m | 2:30PM1.47m | 3:14AM1.55m | 3:03PM1.47m | 3:52AM1.53m | 3:33PM1.44m | 4:29AM1.48m | 4:02PM1.39m | 5:05AM1.42m | 4:30PM1.33m | ||||||||
Low Tide | 7:31PM0.27m | 7:56AM0.35m | 8:12PM0.19m | 8:36AM0.38m | 8:49PM0.15m | 9:13AM0.43m | 9:24PM0.14m | 9:47AM0.50m | 9:58PM0.16m | 10:20AM0.56m | 10:30PM0.20m | 10:52AM0.62m | 11:02PM0.25m | ||||||||
 |  |  | | | |  | | | | |  | |  |  | | | | | | | |
 | 6:26 | — | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:16 | — | — |
 | — | 6:08 | — | — | 6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — |
mm | — | — | 1 | — | — | 1 | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 19 | 17 | 16 | 15 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 19 | 19 | 16 | 23 | 23 | 18 |
Feels °C | 15 | 15 | 15 | 14 | 13 | 11 | 4 | 1 | 1 | 3 | 4 | 5 | 6 | 7 | 8 | 14 | 13 | 10 | 18 | 18 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 16 | — | SSW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 |
| kJ | 1108 | 1028 | 598 | 404 | 295 | 128 | 208 | — | 46 | 3563 | 4079 | 3286 | 2090 | 1343 | 1215 | 1014 | 2259 | 1616 | 1304 | 1067 | 658 |
Swell 2 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 15 | SW 20 | WSW 5 | SW 18 | — | — | — | SSW 15 | S 16 | S 15 | S 13 | SSW 13 | SW 22 | SW 18 | S 16 | SSW 15 | SSW 14 | — | — |
| kJ | 28 | 24 | 22 | 15 | 11 | 109 | — | — | — | 186 | 181 | 110 | 90 | 35 | 19 | 926 | 131 | 44 | 66 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | SW 19 | S 18 | — | — | — | — | — | — | — | — | SW 22 | SSW 17 | — | — | — | — | — |
| kJ | — | — | — | — | 58 | 6 | — | — | — | — | — | — | — | — | 18 | 300 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 4 | N 4 | N 3 | WNW 3 | WSW 5 | WSW 7 | SW 11 | SW 13 | SW 14 | S 6 | — | S 6 | — | — | — | NW 3 | NW 3 | NW 3 | N 4 | NW 4 | N 4 |
| kJ | 18 | 21 | 8 | 4 | 42 | 99 | 1432 | 4003 | 4729 | 175 | — | 91 | — | — | — | 7 | 6 | 9 | 12 | 17 | 58 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 38 | 13 | 27 | 27 | 45 | 484 | 782 | 289 | 346 | 170 | 31 | 31 | 45 | 0 | 17 | 25 | 17 | 25 | 13 | 34 |
Best forecast wave conditions in Mornington Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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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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