Surf Forecasts:
Gunnamatta Beach surf forecast from 14 Sep 2026:
- Best quality surf: Monday 21 Sep, 4AM (local time) - 10ft (3.0m), 12s period, SW swell with cross-shore winds.
- Most powerful swell: Tuesday 15 Sep, 7PM (local time) - 13ft (4.0m), 14s period, SW swell with 5,815 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 4AM (local time) - 10ft (3.0m), 12s 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 (Sep 21) at 4AM. The primary swell is predicted to be 3.0m and 12s period. 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 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 1.2m 5s period and expected on Sunday (Sep 20) at 10AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Mon 21st Sep) | 10ft (3.0m) 12s |
| Best Surf | 4AM (Mon 21st Sep) | 10ft (3.0m) 12s |
| 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
Gunnamatta Beach is gonna have a rough run for a while. There is no surf worth paddling out for on day one, so the window starts with a blank. For days Monday the 14th through Sunday the 20th, the conditions here are locked into a “poor surf” or just “marginal” rut with strong onshore or cross-chop winds. You're looking at about a six-day gap of nearly nothing worth your while. The swell is weighted with moderate-to-strong combined energy (422 to over 5000 units) but it’s all coming in with a rough wind signature – mostly onshore or cross, so the quality is just destroyed.
The real standout window for Gunnamatta Beach lands on Wednesday the 23rd into Thursday the 24th. That Wednesday afternoon looks glassy with a gentle cross-shore giving way to a glassy surface – combined energy is moderate at 383 units, and the water temp anomaly is 1° warmer than usual, so a touch warmer than normal for the time of year. Then Thursday the 24th serves up light offshore winds and clean conditions. That’s the best stretch in the whole outlook. By Thursday afternoon the combined energy rises to 714 units, with a 4 ft SW swell coming in at a long 15-second period, and moderate offshore wind keeping the face clean. It’s not massive but for this break it’s as clean as it gets in this window. Crowds are often a thing here, so expect company.
Later, Tuesday the 29th morning has a promising brief window: 4 ft of SW groundswell with an 18-second period – very long period – which could be straight and tricky on a beach break, but with gentle offshore winds and a clean surface, it puts conditions in good shape for experienced surfers. The combined energy is in the strong range (2063 units). Given the long interval, expect more powerful sets with longer lulls. Not ideal for beginners.
There’s a fair bit of swell between Tuesday the 22nd and Wednesday the 23rd as well, but it’s all over 8 ft with mostly cross-off winds, making it expert territory. Some of that mid-week surf on Monday the 21st hits 10 ft and combined energy shoots over 3000 units, but it’s just too big for this beach setup – those swells are better suited to a reef or point break.
If you’re a kite surfer, the dominant onshore and strong wind days around the 15th to 20th might look more interesting than paddle surfing.
All up, Gunnamatta Beach doesn’t really shine until Thursday the 24th and then Tuesday the 29th – those are the two cleanest moments, but the rest of the 16-day stretch is a bit of a grind.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue morning. Very mild (max 16°C on Mon morning, min 9°C on Wed night). Winds increasing (light winds from the WSW on Mon morning, strong winds from the SW by Tue afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Sat afternoon, min 8°C on Thu night). Winds increasing (light winds from the SW on Thu night, strong winds from the N by Sat night). | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 13 | SW 18 | SW 14 | SW 14 | SW 14 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 14 | SW 13 | WSW 13 | SW 12 | SW 15 | SW 14 | WSW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 404 | 295 | 126 | 3050 | 5021 | 4974 | 4079 | 3990 | 3330 | 2090 | 1471 | 1429 | 1324 | 803 | 1374 | 1299 | 1309 | 558 | 1305 | 1155 | 2963 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | on | on | on | on | cross-on | on | on | on | on | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-on | cross-on |
High Tide | 1:41PM1.62m | 2:18AM1.71m | 2:17PM1.63m | 2:59AM1.73m | 2:52PM1.63m | 3:37AM1.71m | 3:24PM1.60m | 4:13AM1.66m | 3:55PM1.55m | 4:48AM1.58m | 4:25PM1.49m | 5:25AM1.50m | 4:56PM1.42m | ||||||||
Low Tide | 7:57PM0.18m | 8:22AM0.39m | 8:35PM0.12m | 9:00AM0.42m | 9:10PM0.11m | 9:35AM0.47m | 9:45PM0.14m | 10:08AM0.53m | 10:18PM0.19m | 10:41AM0.60m | 10:52PM0.27m | 11:14AM0.68m | 11:28PM0.35m | ||||||||
 |  |  |  | | | | |  | | |  | | | | | | | | | | |
 | 6:24 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:13 | — | — |
 | — | 6:08 | — | — | 6:09 | — | — | 6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:14 | — |
mm | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 15 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 17 | 20 | 16 | 22 | 23 | 20 | 23 | 20 | 13 |
Feels °C | 13 | 12 | 11 | 1 | 0 | 0 | 3 | 4 | 5 | 5 | 6 | 7 | 12 | 15 | 10 | 17 | 18 | 15 | 14 | 12 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 12 | — | SSW 14 | SSW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 12 | SW 14 | SW 13 | WSW 13 | SW 12 | SW 15 | SW 14 | SW 11 |
| kJ | 404 | 295 | 126 | — | 62 | 46 | 4079 | 3990 | 3330 | 2090 | 1471 | 1429 | 1324 | 645 | 1374 | 1299 | 1309 | 558 | 1305 | 1155 | 1965 |
Swell 2 Height (m) Direction Period (s) | SW 20 | WSW 6 | SW 18 | — | — | — | S 16 | SSW 15 | S 14 | S 15 | — | S 14 | SW 18 | SW 16 | S 15 | SSW 14 | SSW 15 | SW 16 | SSW 16 | SSW 15 | SW 13 |
| kJ | 15 | 15 | 109 | — | — | — | 129 | 222 | 106 | 39 | — | 144 | 208 | 803 | 39 | 37 | 42 | 133 | 85 | 77 | 744 |
Swell 3 Height (m) Direction Period (s) | — | SW 19 | — | — | — | — | — | — | — | — | — | — | SSW 16 | — | — | — | — | — | — | — | — |
| kJ | — | 58 | — | — | — | — | — | — | — | — | — | — | 153 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 3 | — | WSW 4 | SW 14 | SW 14 | SW 14 | — | — | — | — | — | — | NW 3 | WNW 3 | NW 4 | NNW 3 | — | NNW 3 | N 5 | NW 5 | WSW 11 |
| kJ | 3 | — | 21 | 3050 | 5021 | 4974 | — | — | — | — | — | — | 5 | 6 | 12 | 7 | — | 6 | 62 | 98 | 2963 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 25 | 15 | 60 | 490 | 802 | 272 | 336 | 149 | 46 | 46 | 17 | 5 | 9 | 17 | 37 | 9 | 17 | 9 | 542 | 60 | 15 |
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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