Surf Forecasts:
Gunnamatta Beach surf forecast from 17 Aug 2026:
- Best quality surf: Sunday 23 Aug, 1AM (local time) - 10ft (3.0m), 15s period, SW swell with cross-onshore winds.
- Most powerful swell: Saturday 22 Aug, 4PM (local time) - 11ft (3.5m), 16s period, WSW swell with 5,631 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 7AM (local time) - 4.5ft (1.4m), 15s 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 Tuesday (Aug 18) at 7AM. The primary swell is predicted to be 1.4m and 15s period with a secondary swell of 0.6m and 18s. The wind is predicted to be offshore 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 Saturday (Aug 22) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Wednesday (Aug 19) at 1PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Tue 18th Aug) | 4.5ft (1.4m) 15s |
| Best Surf | 1AM (Sun 23rd Aug) | 10ft (3.0m) 15s |
| Most Powerful | 4PM (Sat 22nd Aug) | 11ft (3.5m) 16s |
Table - best surf conditions forecast for Gunnamatta Beach over the next 16 days.
The Lowdown
Gunnamatta Beach (Mornington Peninsula) is looking patchy over the next 16 days. Water temp is 57°F, which is about a degree and a half warmer than usual for this time of year – you won’t need the thickest rubber. The first decent swell hits Tuesday the 18th – 4ft of SW groundswell with a 14-second period, and the morning NE offshore keeps it clean. Energy’s moderate at 974. Tuesday afternoon stays clean with a light NNE breeze. Not huge, but a solid start.
Wednesday the 19th is blown out – strong north winds at 28 mph and rain. Skip it. Thursday’s not much better with fresh cross-shore winds and lumpy conditions. The first real standout is Sunday the 23rd afternoon. That’s the one. Swell jumps to 7ft from the SW with a 14-second period, and the wind goes glassy – just 3 mph from the west. Energy’s strong at 1853, and it’s rated excellent for experienced surfers. Clean, punchy, and consistent – that’s your session if you only get one. It’s too big for beginners, but for the crew who know the banks, it’s firing.
Monday the 24th has a clean morning with a cross-off breeze and 6ft of SW swell – good, but a step down from Sunday. The afternoon drops to 5ft and stays clean. Mid-week is average: Tuesday the 25th afternoon is clean but small at 4ft, then Wednesday and Thursday get hammered by strong winds again – Thursday the 27th has a short 8-second period that’ll be lumpy and weak.
The second week is quieter, nothing screaming standout. Saturday the 29th is all onshore and messy. Sunday the 30th has some size (4-4ft) but long 17-18 second swell that’ll break too straight for a beach break, with cross-shore winds messing it up. Monday the 31st has 6ft with a 16-second period but light cross-onshore – marginal.
If you’re patient, the real gem is at the end: Wednesday the 2nd of September. Morning has 6ft of WSW swell with a 17-second period and a light east cross-off – clean. But the afternoon is the one – glassy, zero wind, 5ft SW swell with a 16-second period, and strong energy at 1470. Another excellent window for the experienced crew. It’s two weeks out, so don’t bank on it, but it’s got serious promise.
So overall: don’t stress the flat, blowy days early on – wait for Sunday the 23rd afternoon, and keep an eye on Wednesday the 2nd. The rest is just waiting for the wind to play ball.
Rusty
Short Range ForecastLight rain (total 5mm), mostly falling on Wed morning. Very mild (max 17°C on Tue afternoon, min 11°C on Thu night). Winds increasing (light winds from the NNE on Tue afternoon, strong winds from the N by Wed morning). | Days 4-6 Weather SummaryMostly dry. Very mild (max 13°C on Fri morning, min 10°C on Fri night). Winds decreasing (fresh winds from the WNW on Fri night, calm by Sun night). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 15 | SW 15 | SW 15 | SW 15 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | SW 14 | SW 16 | WSW 15 | WSW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 14 | SW 14 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 667 | 621 | 465 | 255 | 239 | 217 | 368 | 357 | 546 | 657 | 915 | 2578 | 5316 | 5631 | 3181 | 1875 | 1796 | 1904 | 1179 | 862 | 545 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-on | cross | cross | cross | cross-on | on | cross-on | cross | glassy | cross-off | cross-off | cross-off | cross-off |
High Tide | 3:25PM1.71m | 4:06AM1.65m | 3:58PM1.67m | 4:46AM1.61m | 4:30PM1.60m | 5:26AM1.54m | 5:01PM1.53m | 6:06AM1.46m | 5:31PM1.45m | 6:51AM1.38m | 6:04PM1.37m | 7:47AM1.31m | 6:44PM1.29m | ||||||||
Low Tide | 9:47PM0.13m | 10:01AM0.43m | 10:23PM0.14m | 10:37AM0.52m | 10:58PM0.19m | 11:12AM0.62m | 11:33PM0.25m | 11:48AM0.71m | 00:11AM0.32m | 12:26PM0.81m | 00:53AM0.40m | 1:16PM0.89m | 1:46AM0.46m | ||||||||
 |  |  |  |  | | | | | | | | |  |  | | |  | | | | |
 | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — |
 | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — |
mm | — | — | — | 2 | 2 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 17 | 13 | 13 | 14 | 15 | 15 | 12 | 13 | 13 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 13 |
Feels °C | 11 | 14 | 13 | 4 | 6 | 9 | 9 | 8 | 7 | 8 | 7 | 6 | 7 | 7 | 8 | 11 | 11 | 12 | 9 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 15 | SW 15 | SW 15 | SW 15 | WSW 13 | WSW 13 | WSW 13 | WSW 12 | SW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 14 | SW 14 | SW 13 |
| kJ | 667 | 621 | 465 | 255 | 239 | 217 | 368 | 357 | 546 | 575 | 915 | 2578 | 3806 | 4327 | 3181 | 1875 | 1796 | 1904 | 1179 | 862 | 545 |
Swell 2 Height (m) Direction Period (s) | SW 18 | SSW 17 | SE 4 | — | SE 7 | SW 20 | SW 18 | SW 16 | SW 16 | SW 15 | WSW 11 | SSW 16 | SW 24 | — | SW 20 | SW 17 | SSW 17 | SSW 16 | SW 21 | SW 20 | SW 18 |
| kJ | 307 | 27 | 4 | — | 2 | 61 | 155 | 219 | 216 | 657 | 170 | 83 | 22 | — | 136 | 760 | 57 | 48 | 18 | 15 | 81 |
Swell 3 Height (m) Direction Period (s) | SE 5 | — | SSW 15 | SE 6 | S 16 | ESE 8 | E 8 | — | — | SW 20 | SW 18 | — | — | — | — | SSW 18 | — | — | SW 21 | WSW 20 | — |
| kJ | 7 | — | 23 | 2 | 5 | 6 | 1 | — | — | 99 | 330 | — | — | — | — | 61 | — | — | 18 | 37 | — |
Wind waves Height (m) Direction Period (s) | E 5 | E 5 | NNE 3 | NNE 5 | NNE 5 | NNW 4 | NW 4 | NW 4 | NW 3 | — | — | WNW 3 | WSW 15 | WSW 16 | — | — | — | — | NNW 3 | NNW 3 | NNW 3 |
| kJ | 21 | 8 | 7 | 66 | 84 | 17 | 15 | 13 | 3 | — | — | 3 | 5316 | 5631 | — | — | — | — | 3 | 3 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 6 | 73 | 51 | 9 | 37 | 45 | 15 | 17 | 17 | 45 | 15 | 45 | 15 | 14 | 0 | 0 | 5 | 0 | 5 |
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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