Surf Forecasts:
Marengo surf forecast from 10 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 7PM (local time) - 13ft (4.0m), 17s period, SW swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 10AM (local time) - 16ft (5.0m), 16s period, SW swell with 11,329 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 7AM (local time) - 4.5ft (1.3m), 15s period with SW swell.
Best Forecast Surf Conditions for Marengo this week:
The surf forecast for Marengo over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 11) at 7AM. The primary swell is predicted to be 1.3m and 15s period with a secondary swell of 0.9m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Marengo in the next 16 days are 5.0m 16s and forecast to arrive on Thursday (Aug 13) at 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Monday (Aug 17) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Tue 11th Aug) | 4.5ft (1.3m) 15s |
| Best Surf | 7PM (Wed 12th Aug) | 13ft (4.0m) 17s |
| Most Powerful | 10AM (Thu 13th Aug) | 16ft (5.0m) 16s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, Rusty here, let’s talk about what’s brewing for Marengo.
We’ve got a bit of a quiet start, but hang tight because a serious pulse of swell is on the way. The first few days are a tease, with some small, clean waves in the 4ft to 5ft range from the SW on Tuesday, but it’s only marginal. The real show kicks off on Wednesday, August 12th.
That Wednesday morning, the swell jumps to a solid 13ft from the WSW, with a long period of 16 seconds and offshore winds. The wave energy is massive – you’re looking at 10129 (combined energy). This is a powerful, long-period groundswell. It’s going to be big and a bit raw, but the offshore wind will keep it clean. This is a day for experienced surfers only at 13ft. By the afternoon, the period stretches to 17 seconds and the energy is even higher at 12025.
The standout of the whole run is Thursday, August 13th. Morning conditions are exceptional for experts. We’re talking a 16ft SW swell with a 16-second period and clean, moderate offshore winds from the W. The combined energy is 15098. This is the biggest, most powerful day. By the afternoon it drops to a still-heavy 8ft, excellent for experienced surfers, but the morning is the peak. This is a true groundswell, so with that very long period, it’ll be best on the points and reefs of Marengo, as it might be a bit straight for the beach sections.
Friday and Saturday (14th & 15th) still offer great waves for experienced surfers, with 8ft to 10ft SW swell and offshore winds, just a notch down in energy. Crowds are possible here, so get in early.
Then we hit a lull. From Sunday the 16th through the following week, the surf drops off. Winds shift onshore for Sunday and Monday, making it pretty poor. We get a few glassy days around the 19th and 20th, but the swell is tiny, under 3ft and with very low energy (101 to 436). It’s pretty ordinary.
There’s a little bump of 5ft SW swell on Saturday the 22nd, but the period is a short 8 seconds, and the wind is cross-shore, so it’s not much to write home about. A bit further out, on Monday the 24th, an afternoon session with a 4ft SW swell and offshore winds from the WSW looks promising, with moderate energy (702). And again on Tuesday the 25th, gentle offshore winds on a 4ft SW swell.
Best Bet: Without a doubt, get on Thursday, August 13th for the biggest, cleanest and most powerful swell of the forecast. Wednesday, August 12th is also a ripper for the bigger, gnarliest conditions.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Mon night. Very mild (max 14°C on Thu morning, min 10°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 13°C on Fri morning, min 11°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
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 | SW 14 | SW 15 | SW 16 | WSW 16 | WSW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 989 | 911 | 757 | 1381 | 8016 | 9684 | 3415 | 11329 | 2869 | 3351 | 3840 | 2944 | 2487 | 2075 | 1875 | 1325 | 978 | 924 | 736 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-on | on | on | on | on |
High Tide | 10:40PM1.93m | 8:40AM1.47m | 11:47PM2.03m | 10:50AM1.52m | 00:38AM2.14m | 12:14PM1.69m | 1:20AM2.23m | 1:17PM1.88m | 1:57AM2.28m | 2:10PM2.04m | 2:32AM2.28m | 2:57PM2.16m | 3:05AM2.24m | ||||||
Low Tide | 5:03AM1.33m | 4:09PM0.42m | 6:12AM1.17m | 5:31PM0.42m | 6:58AM0.96m | 6:35PM0.39m | 7:37AM0.74m | 7:29PM0.38m | 8:14AM0.53m | 8:16PM0.40m | 8:49AM0.36m | 8:59PM0.46m | |||||||
 |  | |  |  |  |  | |  | | | | |  | | | | |  | |
 | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:11 | — | — | 7:11 | — | — |
 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — |
mm | 1 | — | — | 2 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 13 | 13 | 11 | 12 | 12 | 11 | 14 | 14 | 12 | 13 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 12 |
Feels °C | 7 | 8 | 9 | 5 | 5 | 6 | 6 | 9 | 10 | 8 | 8 | 7 | 9 | 10 | 10 | 10 | 9 | 9 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 14 | SW 15 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | ESE 6 |
| kJ | 989 | 911 | 757 | 1381 | 2113 | 2316 | 3415 | 3745 | 2869 | 3351 | 3840 | 2944 | 2487 | 2075 | 1875 | 1325 | 978 | 924 | 172 |
Swell 2 Height (m) Direction Period (s) | SSW 6 | SW 21 | SW 19 | — | — | SSE 16 | SE 15 | SSE 16 | SSE 15 | SSE 16 | SSE 16 | S 15 | — | S 16 | S 17 | S 15 | S 13 | — | SW 14 |
| kJ | 87 | 68 | 224 | — | — | 25 | 9 | 24 | 23 | 48 | 25 | 17 | — | 5 | 6 | 18 | 3 | — | 736 |
Swell 3 Height (m) Direction Period (s) | ESE 9 | E 10 | E 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 8 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 6 | — | — | NNW 3 | WSW 16 | WSW 17 | — | SW 16 | — | — | — | — | — | — | — | ESE 3 | E 5 | ESE 6 | — |
| kJ | 162 | — | — | 12 | 8016 | 9684 | — | 11329 | — | — | — | — | — | — | — | 5 | 69 | 84 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 21 | 2 | 35 | 70 | 2 | 0 | 0 | 0 | 0 | 0 | 76 | 0 | 0 | 131 | 18 | 41 | 44 | 21 |
Best forecast wave conditions in Cape Otway | |||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||
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Information about the Marengo Surf forecast
The above surf forecast table for Marengo provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Marengo can be found by selecting the local surf guide option on the grey menu. Our Marengo 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 (Marengo) 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 Marengo 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.
Marengo is 93 km (58 miles) from the city of Geelong West. If you plan a holiday in Cape Otway, look for hotels and other accommodation in Geelong West. Geelong West has rooms for a wide range of budgets as well as car hire and transport links.
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