Surf Forecasts:
Gunnamatta Beach surf forecast from 29 Aug 2026:
- Best quality surf: Friday 4 Sep, 1AM (local time) - 11ft (3.5m), 15s period, SW swell with cross-shore winds.
- Most powerful swell: Friday 4 Sep, 4AM (local time) - 11ft (3.5m), 16s period, SW swell with 6,368 kJ wave energy.
- Next surfable swell (1★+): Monday 31 Aug, 1PM (local time) - 7ft (2.1m), 14s 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 Monday (Aug 31) at 1PM. The primary swell is predicted to be 2.1m and 14s period with a secondary swell of 0.8m and 19s. The wind is predicted to be glassy 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 Friday (Sep 04) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Tuesday (Sep 01) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Mon 31st Aug) | 7ft (2.1m) 14s |
| Best Surf | 1AM (Fri 4th Sep) | 11ft (3.5m) 15s |
| Most Powerful | 4AM (Fri 4th Sep) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Gunnamatta Beach over the next 16 days.
The Lowdown
Alright, let's get into it. This is looking like a real mixed bag for us here at Gunnamatta Beach. We've got some serious size on the way, but the wind is going to be the big story. This isn't one for the faint-hearted, and the window of really clean, manageable surf is surprisingly short.
We start off on Sunday the 30th of August with a solid 6 ft to 7 ft SW groundswell, but a cross-onshore breeze is going to make it messy and hard work. The energy is pumping, but the quality just isn't there. Monday the 31st is where it starts to get interesting. The swell bumps up to 7 ft from the SW with a long 14-second period, and in the afternoon, the wind goes glassy – absolutely dead calm. That's the standout session for the near future. The water is about average for this time of year, so no shock to the system in that regard. The combined energy is massive, meaning there's plenty of grunt in those lines. It'll be too big for beginners, but for anyone with a bit of experience, that glass-off is a golden ticket.
Tuesday the 1st of September gets blown out by a howling 28 mph N wind. The swell drops a little, but the wind makes it a no-go. Then we hit a real gnarly patch. From Wednesday the 2nd right through to Wednesday the 9th of September, the swell is big to massive – we're talking 8 ft building to a terrifying 18 ft. The wind is almost all onshore or strong cross-shore, creating violent, lumpy conditions. The energy values are through the roof, but this is survival stuff, not surfing. On Friday the 4th of September and again on Monday the 7th of September afternoon, the wind and tide are okay, but the swell is simply too big for Gunnamatta, making it a strictly experts-only zone.
There is a light at the end of the tunnel. After that week of chaos, things start to settle. The morning of Thursday the 10th of September sees the swell drop back to a more manageable 8 ft, but with a 13-second period and a moderate cross-shore, it's still a bit lumpy. The real comeback is on Friday the 11th of September. The morning has a clean 7 ft swell with a very long 18-second period and a gentle breeze. But the afternoon is the pick of that day – a clean 8 ft swell with light offshore winds from the east-northeast. The energy is high, and the conditions are described as excellent for experienced surfers, so it'll be well shaped. Saturday the 12th of September is another clean day, but with stronger winds again, so the quality fades. After that, the surf pushes through to the 14th, but the consistency and quality are marginal at best. For a spot like Gunnamatta that's fairly consistent, this is a rough run of wind and size, but that Monday glass-off and the Friday offshore window are the real deals if you can get out there.
- Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Very mild (max 19°C on Tue afternoon, min 9°C on Sun morning). Winds increasing (calm on Mon afternoon, strong winds from the N by Tue morning). | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Fri night. Very mild (max 15°C on Fri afternoon, min 9°C on Thu night). Winds increasing (light winds from the N on Fri morning, strong winds from the N by Fri night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 16 | SW 15 | SW 15 | SW 14 | SW 15 | SW 15 | SW 14 | SW 13 | WSW 13 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1191 | 1306 | 1668 | 1729 | 1688 | 2475 | 1572 | 1025 | 1154 | 2048 | 2794 | 2509 | 2275 | 5105 | 5894 | 4978 | 4032 | 2832 | 2021 | 1808 | 1308 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross | glassy | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross-on | on | cross | cross-off | cross-off | cross-off | cross-off | cross-on | on |
High Tide | 1:24PM1.54m | 1:34AM1.47m | 1:54PM1.58m | 2:16AM1.58m | 2:24PM1.62m | 2:56AM1.66m | 2:54PM1.64m | 3:36AM1.71m | 3:25PM1.65m | 4:17AM1.72m | 3:58PM1.64m | 5:00AM1.69m | 4:35PM1.62m | ||||||||
Low Tide | 7:34PM0.48m | 7:41AM0.39m | 8:07PM0.35m | 8:20AM0.38m | 8:39PM0.23m | 8:57AM0.40m | 9:12PM0.13m | 9:34AM0.44m | 9:48PM0.07m | 10:11AM0.49m | 10:26PM0.04m | 10:50AM0.57m | 11:09PM0.05m | ||||||||
 |  |  | | |  | |  |  | | |  |  | | | | |  |  | | | |
 | 6:47 | — | — | 6:45 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — |
 | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | 3 | — | — | — | 2 | — | — | — | — | 7 | 9 | 2 | 3 |
Temp °C | 11 | 11 | 10 | 10 | 12 | 13 | 17 | 19 | 15 | 13 | 14 | 14 | 14 | 14 | 12 | 13 | 15 | 15 | 14 | 13 | 12 |
Feels °C | 8 | 8 | 6 | 9 | 11 | 10 | 8 | 12 | 7 | 7 | 8 | 6 | 7 | 6 | 6 | 8 | 11 | 8 | 8 | 6 | 4 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SW 14 | SW 14 | SW 16 | SW 15 | SW 15 | SW 14 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 |
| kJ | 1191 | 1306 | 1668 | 1729 | 1688 | 2475 | 1572 | 1025 | 1154 | 2048 | 2794 | 2509 | 2275 | 3133 | 5894 | 4978 | 4032 | 2832 | 2021 | 1808 | 1308 |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 20 | SSW 15 | SW 20 | SW 19 | SSW 17 | SSW 16 | SSW 15 | SW 17 | SSW 17 | S 16 | SSW 15 | — | — | SSW 17 | S 16 | SSW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 |
| kJ | 137 | 134 | 71 | 196 | 520 | 97 | 50 | 88 | 290 | 95 | 137 | 71 | — | — | 476 | 186 | 212 | 61 | 97 | 57 | 48 |
Swell 3 Height (m) Direction Period (s) | SW 20 | WSW 20 | — | S 14 | S 13 | — | — | — | SSW 14 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 98 | 149 | — | 103 | 90 | — | — | — | 36 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | N 4 | NW 4 | W 4 | — | NW 3 | NW 4 | WNW 5 | WSW 13 | — | — | — | N 3 | N 3 | N 4 | SSW 5 |
| kJ | — | — | — | — | — | — | 42 | 58 | 37 | — | 5 | 36 | 77 | 5105 | — | — | — | 8 | 5 | 10 | 90 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 9 | 60 | 15 | 14 | 0 | 14 | 345 | 345 | 46 | 46 | 45 | 77 | 77 | 49 | 17 | 14 | 5 | 34 | 478 | 874 |
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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