Surf Forecasts:
Portsea Back Beach surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 12 Sep, 1AM (local time) - 8ft (2.5m), 16s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 10PM (local time) - 13ft (4.0m), 18s period, SW swell with 10,148 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 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 (Sep 06) at 1PM. The primary swell is predicted to be 2.1m and 14s period with a secondary swell of 0.8m and 7s. 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 18s and forecast to arrive on Wednesday (Sep 09) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Sep 13) at 10AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Sun 6th Sep) | 7ft (2.1m) 14s |
| Best Surf | 1AM (Sat 12th Sep) | 8ft (2.5m) 16s |
| Most Powerful | 10PM (Wed 9th Sep) | 13ft (4.0m) 18s |
Table - best surf conditions forecast for Portsea Back Beach over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Tue night. Very mild (max 15°C on Sun morning, min 9°C on Mon night). Winds increasing (calm on Sun morning, strong winds from the SSW by Tue night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 13°C on Thu afternoon, min 7°C on Fri night). Winds decreasing (fresh winds from the SW on Wed morning, calm by Fri night). | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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 14 | SW 14 | SW 13 | SW 12 | SSW 8 | SW 14 | SW 18 | SW 17 | SW 16 | SW 16 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2125 | 1423 | 903 | 297 | 464 | 1311 | 995 | 2442 | 3001 | 5399 | 9417 | 9830 | 7213 | 5169 | 3411 | 2247 | 2391 | 3330 | 2839 | 2093 | 1273 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | cross-on | on | cross-on | cross-on | cross-on | glassy | cross-off | cross-off | cross-off |
High Tide | 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 | 11:44AM1.29m | 11:52PM1.31m | 12:34PM1.35m | 00:55AM1.41m | ||||||||
Low Tide | 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 | 5:10AM0.36m | 5:52PM0.51m | 6:17AM0.34m | 6:46PM0.38m | ||||||||
 |  |  |  | |  | | |  | | | | | | | | | | | | | |
 | 6:37 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:28 | — | — | 6:26 | — | — |
 | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 14 | 14 | 12 | 11 | 11 | 11 | 12 | 11 | 11 | 12 | 11 | 12 | 13 | 11 | 11 | 10 | 9 | 13 | 18 | 15 |
Feels °C | 15 | 11 | 10 | 4 | 5 | 7 | 9 | 9 | 1 | 2 | 4 | 4 | 8 | 8 | 8 | 7 | 5 | 7 | 9 | 15 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 13 | SW 12 | SW 13 | SW 14 | SW 13 | SW 17 | SW 16 | SW 21 | SSW 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 |
| kJ | 2125 | 1423 | 903 | 297 | 193 | 1311 | 865 | 2442 | 3001 | 977 | 471 | 9830 | 7213 | 5169 | 3411 | 2247 | 2391 | 3330 | 2839 | 2093 | 1273 |
Swell 2 Height (m) Direction Period (s) | S 7 | WSW 18 | — | SW 22 | SW 21 | SW 20 | SW 18 | SW 17 | SSW 16 | SSW 20 | — | S 20 | S 18 | SSW 16 | SSW 14 | SSW 14 | — | SSW 16 | S 18 | SSW 17 | SSW 16 |
| kJ | 83 | 31 | — | 18 | 69 | 377 | 995 | 1050 | 146 | 227 | — | 942 | 632 | 324 | 213 | 201 | — | 266 | 222 | 229 | 50 |
Swell 3 Height (m) Direction Period (s) | SW 20 | — | — | S 22 | S 21 | SSW 20 | SSW 18 | — | — | SSW 16 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 15 | — | — | 9 | 9 | 37 | 61 | — | — | 81 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SSW 6 | WSW 5 | SW 6 | SSW 8 | — | — | — | SW 6 | SW 16 | SW 18 | — | — | — | — | — | — | — | — | — | NNW 3 |
| kJ | — | 50 | 83 | 255 | 464 | — | — | — | 149 | 5399 | 9417 | — | — | — | — | — | — | — | — | — | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 25 | 17 | 170 | 170 | 27 | 13 | 31 | 481 | 597 | 647 | 25 | 25 | 100 | 17 | 25 | 43 | 0 | 0 | 0 | 7 |
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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