Surf Forecasts:
Gunnamatta Beach surf forecast from 11 Aug 2026:
- Best quality surf: Thursday 13 Aug, 4AM (local time) - 10ft (3.0m), 16s period, SW swell with cross-shore winds.
- Most powerful swell: Thursday 13 Aug, 1AM (local time) - 11ft (3.5m), 16s period, WSW swell with 6,144 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 4AM (local time) - 10ft (3.0m), 16s period with SW swell.
Best Forecast Surf Conditions for Gunnamatta Beach this week:
The surf forecast for Gunnamatta Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 13) at 4AM. The primary swell is predicted to be 3.0m and 16s period with a secondary swell of 0.6m and 16s. Another secondary swell of 0.6m and 4s is also forecast. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Gunnamatta Beach in the next 16 days are 3.5m 16s and forecast to arrive on Thursday (Aug 13) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Tuesday (Aug 18) at 1AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Thu 13th Aug) | 10ft (3.0m) 16s |
| Best Surf | 4AM (Thu 13th Aug) | 10ft (3.0m) 16s |
| Most Powerful | 1AM (Thu 13th Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Gunnamatta Beach over the next 16 days.
The Lowdown
Righto, Rusty here. We’ve got a solid 16-day window for Gunnamatta Beach, but you’re gonna have to be patient. There’s a big lump of swell and wind coming through right at the start, and it’s not looking clean at all. From Wednesday the 12th right through to Friday the 14th, we’ve got a powerful SW groundswell running a solid 10ft with a very long 15–16 second period, and the combined energy is whacking us – over 8000 in the afternoon of the 12th (combined energy of all swells directed here: 8892). But the wind is cross-on or onshore at 22–22 mph, and the wave comment calls it poor. That’s just a washing machine out there. Not for us.
Now, here’s where it gets interesting – and this is the stand-out of the whole run. Saturday morning the 15th is the one to circle. The swell is still a heavy 8ft from the SW, period sitting at 15 seconds, combined energy is 3095 – that’s serious power. But the wind drops to glassy out of the south at just 3 mph. Glassy. That’s a massive positive for a beach break, and the comment says “excellent surf conditions for experienced surfers.” This is big, clean, powerful groundswell. That 8ft is right on the edge of being too much for beginners, so this is an advanced-only window. It’s going to be a beast, but for those who can handle it, Saturday morning is the top pick.
After that, the swell eases through Sunday and Monday the 16th and 17th. Sunday has clean conditions with a cross-off breeze and 6ft to 6ft SW swell, period around 14 seconds. Combined energy is dropping to 1223–1498. Good, manageable size, clean lines. Then Monday the 17th keeps it going with clean 5ft SW swell and a nice cross-off wind on the morning. Both these days are solid options for intermediate-to-advanced surfers.
Late in the run, around Monday the 24th, there’s another pulse. The morning shows a 7ft WSW swell with a shorter 10-second period and a clean cross-off breeze. Combined energy is 1325. The comment says “excellent surf conditions for experienced surfers.” That could be a good one, but it’s over a week away – promising, but less certain.
A note on the water: on the first day (Wed 12th) the water temp is 57°F, which is about 2°F warmer than average for this time of year – so pretty normal, just a touch mild.
Overall, if you’re an experienced surfer, set the alarm for Saturday morning the 15th. That’s the clean, big-wave standout. Sunday and Monday are your next best bets. The rest of the window is either too small, too windy, or too big with bad wind. There’s a couple of decent-looking options around the 24th, but we’ll see how that tracks.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed morning. Very mild (max 14°C on Thu afternoon, min 10°C on Wed night). Winds decreasing (fresh winds from the W on Wed morning, light winds from the SSW by Fri night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 15°C on Mon afternoon, min 9°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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 16 | WSW 16 | WSW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2414 | 4543 | 6144 | 4959 | 4688 | 4678 | 4013 | 3539 | 3769 | 2982 | 2482 | 1855 | 1463 | 1220 | 961 | 965 | 1194 | 1246 | 589 | 443 | 532 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | on | on | glassy | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | off | cross-off | off | cross-off |
High Tide | 10:45AM1.51m | 10:03PM1.39m | 11:51AM1.57m | 11:28PM1.44m | 12:45PM1.64m | 00:41AM1.52m | 1:31PM1.69m | 1:42AM1.60m | 2:12PM1.73m | 2:35AM1.65m | 2:50PM1.73m | 3:23AM1.67m | 3:25PM1.71m | ||||||||
Low Tide | 4:35PM0.82m | 4:53AM0.20m | 5:51PM0.69m | 6:02AM0.20m | 6:51PM0.54m | 7:02AM0.21m | 7:42PM0.38m | 7:54AM0.24m | 8:27PM0.25m | 8:40AM0.28m | 9:08PM0.17m | 9:22AM0.35m | 9:47PM0.13m | ||||||||
 |  |  | |  |  | | | | | |  |  | |  | | | | | | | |
 | 7:11 | — | — | 7:09 | — | — | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — |
 | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — |
mm | 1 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 13 | 12 | 13 | 14 | 14 | 13 | 13 | 12 | 12 | 12 | 13 | 11 | 14 | 11 | 11 | 15 | 14 | 14 | 16 | 15 |
Feels °C | 4 | 6 | 6 | 8 | 10 | 9 | 9 | 6 | 7 | 9 | 7 | 9 | 9 | 8 | 5 | 9 | 12 | 11 | 10 | 13 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 |
| kJ | 2414 | 3458 | 4663 | 4959 | 4688 | 4678 | 4013 | 3539 | 3769 | 2982 | 2482 | 1855 | 1463 | 1220 | 961 | 965 | 1194 | 1246 | 589 | 443 | 532 |
Swell 2 Height (m) Direction Period (s) | — | SW 19 | — | S 15 | S 16 | S 16 | S 17 | SSW 16 | SSW 16 | S 15 | S 16 | SSW 14 | SSW 13 | SE 5 | — | SW 24 | SSW 16 | ESE 5 | SW 17 | SW 17 | ESE 4 |
| kJ | — | 891 | — | 165 | 181 | 242 | 140 | 193 | 266 | 113 | 129 | 68 | 35 | 3 | — | 22 | 53 | 36 | 427 | 330 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 24 | — | — | E 6 | ESE 5 | SSW 16 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 22 | — | — | 15 | 3 | 24 |
Wind waves Height (m) Direction Period (s) | W 5 | WSW 16 | WSW 16 | WNW 4 | — | — | — | — | — | — | — | — | — | — | ESE 4 | SE 4 | SE 5 | E 5 | — | NNE 3 | E 4 |
| kJ | 83 | 4543 | 6144 | 13 | — | — | — | — | — | — | — | — | — | — | 7 | 4 | 14 | 57 | — | 2 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 15 | 46 | 46 | 15 | 17 | 15 | 46 | 15 | 0 | 23 | 21 | 6 | 23 | 23 | 0 | 23 | 0 | 14 | 0 | 14 |
Best forecast wave conditions in Mornington Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Gunnamatta Beach Surf forecast
The above surf forecast table for Gunnamatta Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Gunnamatta Beach can be found by selecting the local surf guide option on the grey menu. Our Gunnamatta 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 (Gunnamatta 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 Gunnamatta 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.
Gunnamatta Beach is 31 km (19 miles) from Mornington. If you plan a holiday in Mornington Peninsula, look for hotels and other accommodation in Mornington. Mornington has rooms for a wide range of budgets as well as car hire and transport links.
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