Surf Forecasts:
Gunnamatta Beach surf forecast from 11 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 7PM (local time) - 10ft (3.0m), 15s period, SW swell with cross-onshore winds.
- Most powerful swell: Tuesday 15 Sep, 7PM (local time) - 13ft (4.0m), 14s period, SW swell with 5,765 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 10PM (local time) - 8ft (2.5m), 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 Friday (Sep 11) at 10PM. The primary swell is predicted to be 2.5m and 16s period with a secondary swell of 0.8m and 16s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Gunnamatta Beach in the next 16 days are 4.0m 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 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+) | 10PM (Fri 11th Sep) | 8ft (2.5m) 16s |
| Best Surf | 7PM (Wed 16th Sep) | 10ft (3.0m) 15s |
| Most Powerful | 7PM (Tue 15th Sep) | 13ft (4.0m) 14s |
Table - best surf conditions forecast for Gunnamatta Beach over the next 16 days.
The Lowdown
Righto, let's have a look at what's cookin' at Gunnamatta Beach over the next couple of weeks.
Alright, so straight up, we've got a run of solid, proper surf coming through, but it's not for the faint-hearted. This is advanced territory for sure. The water's sitting at 57°, which is a touch warmer than normal for this time of year – not a bad little bonus.
The standout is the Friday morning of the 11th. We're talking a clean 8 ft SW groundswell with a long 15-second period pushing a heap of energy (2662). But the real beauty is that glassy wind, just a light 3 mph from the SSW. It’ll be absolutely pristine. Crowds are often around here, so get in early if you can handle it. Saturday the 12th is also a cracker, starting with a clean 8 ft SW swell (2934 energy) and a cross-off wind, then dropping to a glassy 7 ft in the afternoon. That Saturday afternoon session is going to be pure magic.
Now, Sunday the 13th gets blown out. 22 mph northerlies will trash that 5 ft swell, so give it a miss. Monday and Tuesday the 15th and 16th see a massive jump in size but with howling onshore winds – 28 mph from the SW on Tuesday! That's 13 ft of messy, dangerous power (5650 energy). That's strictly for the kamikaze crew, or frankly, it looks more like a kite surfer's paradise than a paddle session.
We get a bit of a breather Thursday the 17th afternoon with a lighter cross-onshore and a 6 ft swell, then another window opens Friday the 18th. It's a bit wind-affected with a 16 mph cross-off, but 7 ft from the SW with a 16-second period (2303 energy) will still offer some solid, clean lines for those who know the bank.
After that, the energy drops right off for the weekend of the 19th and 20th. Then a long gap of nothing worthwhile kicks in until we get a little pulse on Monday the 21st. But the real long-range promise is Tuesday the 22nd of September. It’s forecast to be glassy with a huge 10 ft to 12 ft SW groundswell (5997 energy!) and 16-second periods. That is proper, heavy, expert-only territory. Keep an eye on that one, but don't bank on it just yet.
So, to boil it down: Friday morning the 11th and Saturday the 12th are your best bets for quality, clean waves. The rest is either too windy, too big, or too small.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sun afternoon, min 10°C on Fri morning). Winds increasing (calm on Fri morning, fresh winds from the N by Sun morning). | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Tue morning. Very mild (max 17°C on Mon morning, min 10°C on Tue morning). Winds increasing (light winds from the NW on Mon morning, strong winds from the SSW by Tue afternoon). | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | WSW 6 | SW 11 | SW 14 | WSW 14 | SW 14 | SW 14 | SW 15 | SW 14 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2278 | 2945 | 3634 | 2723 | 2012 | 1500 | 1108 | 1028 | 598 | 398 | 290 | 128 | 2059 | 5650 | 5265 | 3863 | 3154 | 2754 | 1618 | 1383 | 2232 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | off | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | on | on | on | on | cross-on | cross-on | cross-on | on | on | cross-on | cross-off |
High Tide | 11:27AM1.47m | 11:36PM1.45m | 12:18PM1.53m | 00:41AM1.55m | 1:02PM1.59m | 1:33AM1.65m | 1:41PM1.62m | 2:18AM1.71m | 2:17PM1.63m | 2:59AM1.73m | 2:52PM1.63m | 3:37AM1.71m | 3:24PM1.60m | ||||||||
Low Tide | 5:35PM0.58m | 5:56AM0.38m | 6:30PM0.43m | 6:52AM0.37m | 7:16PM0.29m | 7:40AM0.37m | 7:57PM0.18m | 8:22AM0.39m | 8:35PM0.12m | 9:00AM0.42m | 9:10PM0.11m | 9:35AM0.47m | 9:45PM0.14m | ||||||||
 | |  |  | |  | |  | | | |  |  |  |  | | | | | | | |
 | 6:28 | — | — | 6:26 | — | — | 6:24 | — | — | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — |
 | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:09 | — | — | 6:09 | — | — | 6:10 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 1 | — | — | — | — | — | — |
Temp °C | 11 | 12 | 12 | 16 | 19 | 18 | 20 | 21 | 20 | 17 | 15 | 15 | 11 | 11 | 10 | 11 | 11 | 10 | 9 | 10 | 9 |
Feels °C | 8 | 9 | 9 | 14 | 17 | 15 | 13 | 15 | 16 | 14 | 11 | 9 | 1 | 0 | -1 | 5 | 5 | 4 | 5 | 8 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 13 | SW 16 | — | WSW 14 | SW 14 | SW 14 | SW 15 | SW 14 | SW 14 | SW 14 |
| kJ | 2278 | 2945 | 3634 | 2723 | 2012 | 1500 | 1108 | 1028 | 598 | 398 | 290 | 128 | 302 | — | 4839 | 3863 | 3154 | 2754 | 1618 | 1383 | 2232 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 17 | SSW 15 | SSW 16 | SSW 17 | SSW 16 | SSW 17 | SSW 16 | SSW 15 | SW 20 | NNW 3 | SW 18 | — | — | SSW 15 | SSW 15 | S 16 | SSW 16 | — | S 15 | SSW 18 |
| kJ | 384 | 381 | 243 | 211 | 97 | 81 | 28 | 24 | 22 | 15 | 2 | 109 | — | — | 46 | 44 | 134 | 763 | — | 155 | 422 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | SW 19 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 58 | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | N 4 | N 4 | N 3 | N 3 | WSW 3 | WSW 6 | SW 11 | SW 14 | SW 14 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 18 | 13 | 8 | 8 | 4 | 101 | 2059 | 5650 | 5265 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 23 | 0 | 0 | 0 | 14 | 34 | 17 | 14 | 9 | 60 | 49 | 573 | 674 | 272 | 327 | 23 | 23 | 23 | 15 | 0 |
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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