Surf Forecasts:
Marengo surf forecast from 17 Aug 2026:
- Best quality surf: Saturday 22 Aug, 10AM (local time) - 13ft (4.0m), 15s period, WSW swell with offshore winds.
- Most powerful swell: Saturday 22 Aug, 1PM (local time) - 13ft (4.0m), 16s period, SW swell with 8,248 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 4PM (local time) - 8ft (2.5m), 13s period with W 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 Thursday (Aug 20) at 4PM. The primary swell is predicted to be 2.5m and 13s period with a secondary swell of 0.9m and 13s. Another secondary swell of 0.5m and 16s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Marengo in the next 16 days are 4.0m 16s and forecast to arrive on Saturday (Aug 22) at 1PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Tuesday (Aug 18) at 7PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Thu 20th Aug) | 8ft (2.5m) 13s |
| Best Surf | 10AM (Sat 22nd Aug) | 13ft (4.0m) 15s |
| Most Powerful | 1PM (Sat 22nd Aug) | 13ft (4.0m) 16s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
G'day, Rusty here. Look, I'm not gonna lie, this is a pretty quiet run for Marengo for a while yet. We've got a solid 16-day window ahead, but the first few days are a bit of a write-off. The surf just isn't there to start, and it's not until later in the week that things start to look up. The water temp is sitting at 57°, which is pretty normal for this time of year, so no surprises there.
The first real glimmer of hope comes Thursday afternoon, the 20th of August. We've got a SW swell at 3ft with a 13-second period, and the wind is shifting offshore from the W. It's a small one, but it'll be clean. The combined energy is moderate at 383, so not a lot of push, but for a sneaky late arvo session, it's worth a look.
Friday the 21st is a step up. The SW swell builds to 4ft, but the period gets nice and long at 15 seconds, giving it some real grunt. The offshore breeze from the WNW holds, and the energy is up to 784. It's still moderate, but it's a solid, clean wave. The highlight, though, is Saturday the 22nd. The swell is pushing 7ft from the SW with a 16-second period, and the wind is blowing fresh offshore from the WSW. The energy is ramping up to 2366, which is strong. This is the standout of the whole forecast – a proper groundswell with clean, offshore conditions. It's a bit bigger, so it's one for the experienced crew, but it's the best on offer by a long shot.
Sunday the 23rd holds well too, with a 6ft SW swell and a 14-second period, and a gentle offshore wind. The energy is 1561, still strong. It's a great follow-up day. Monday the 24th and Tuesday the 25th are smaller but still clean, with offshore winds sticking around. Tuesday afternoon, the 25th, even goes glassy and flat with the SSW wind, with a tiny 3ft wave.
After that, the second week gets a bit more mixed. There's a pulse of longer period swell on the 26th, but it's a bit onshore. The 28th sees a 6ft SW swell with a short 10-second period, which is a bit of a messy one. The 30th has a 7ft SSW swell, but with a short 8-second period, it's a bit of a close-out. The 31st has a 4ft SW swell with a very long 20-second period, but the wind is onshore, so it's not clean. The first of September has a 5ft SW swell, but with a cross-shore wind.
Overall, this is a pretty slow start, but the weekend of the 22nd and 23rd looks like the real deal. Get out there then.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed afternoon. Very mild (max 18°C on Tue afternoon, min 10°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 14°C on Fri morning, min 8°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 14 | SW 16 | SW 16 | SW 15 | WSW 15 | SW 15 | WSW 13 | W 13 | SW 15 | SW 15 | SW 14 | SW 16 | WSW 15 | SW 16 | SW 15 | SW 14 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 868 | 412 | 496 | 287 | 178 | 158 | 104 | 265 | 2217 | 905 | 795 | 763 | 1904 | 7330 | 2668 | 2148 | 1602 | 1742 | 1265 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | off | off | cross-off | off | cross-off | off | off | cross-off | off | off | off |
High Tide | 3:36AM2.16m | 4:22PM2.19m | 4:05AM2.05m | 5:03PM2.12m | 4:33AM1.92m | 5:46PM2.00m | 4:59AM1.78m | 6:35PM1.86m | 5:23AM1.65m | 7:37PM1.74m | 5:45AM1.53m | 9:07PM1.67m | |||||||
Low Tide | 9:56AM0.19m | 10:17PM0.66m | 10:28AM0.19m | 10:54PM0.79m | 11:01AM0.24m | 11:30PM0.95m | 11:34AM0.32m | 00:08AM1.11m | 12:11PM0.44m | 00:56AM1.26m | 12:56PM0.56m | 3:19AM1.37m | |||||||
 |  | |  |  |  |  | | | | | | |  | | | | | | |
 | — | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — |
 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — |
mm | — | — | — | 1 | 1 | 2 | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 17 | 18 | 14 | 15 | 15 | 12 | 16 | 12 | 12 | 14 | 14 | 12 | 14 | 13 | 11 | 13 | 12 | 11 |
Feels °C | 9 | 13 | 14 | 10 | 10 | 12 | 8 | 11 | 7 | 8 | 10 | 10 | 7 | 9 | 8 | 7 | 8 | 8 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 14 | SW 16 | SW 16 | ENE 5 | ENE 6 | SW 15 | WSW 13 | WSW 13 | SW 16 | SW 15 | SW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 16 | SW 16 |
| kJ | 868 | 412 | 496 | 287 | 29 | 28 | 104 | 265 | 273 | 628 | 795 | 763 | 1904 | 2325 | 2668 | 2148 | 1602 | 1742 | 1265 |
Swell 2 Height (m) Direction Period (s) | ESE 6 | ESE 6 | ESE 5 | E 5 | SW 15 | WSW 15 | WSW 10 | SW 17 | SW 16 | SW 15 | WSW 19 | SW 18 | — | — | SW 22 | SW 20 | SW 18 | — | — |
| kJ | 62 | 33 | 23 | 16 | 178 | 158 | 31 | 147 | 130 | 905 | 241 | 166 | — | — | 73 | 188 | 379 | — | — |
Swell 3 Height (m) Direction Period (s) | SSW 10 | SW 18 | S 9 | — | — | WNW 6 | SW 18 | E 7 | E 7 | — | SW 20 | — | — | — | S 16 | S 14 | — | — | — |
| kJ | 18 | 255 | 6 | — | — | 8 | 54 | 4 | 1 | — | 99 | — | — | — | 5 | 16 | — | — | — |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | NE 4 | NE 4 | NE 5 | — | — | — | W 13 | — | — | — | — | WSW 15 | — | — | — | — | — |
| kJ | 92 | 38 | 3 | 10 | 62 | — | — | — | 2217 | — | — | — | — | 7330 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 18 | 18 | 18 | 41 | 21 | 21 | 21 | 0 | 0 | 0 | 0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 |
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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