
Surf Forecasts:
Marengo surf forecast from 9 Sep 2026:
- Best quality surf: Thursday 10 Sep, 4AM (local time) - 11ft (3.5m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 10PM (local time) - 11ft (3.5m), 18s period, SW swell with 8,419 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 4AM (local time) - 11ft (3.5m), 17s 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 Thursday (Sep 10) at 4AM. The primary swell is predicted to be 3.5m and 17s period with a secondary swell of 0.3m and 19s. 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 3.5m 18s and forecast to arrive on Wednesday (Sep 09) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 6s period and expected on Monday (Sep 14) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Thu 10th Sep) | 11ft (3.5m) 17s |
| Best Surf | 4AM (Thu 10th Sep) | 11ft (3.5m) 17s |
| Most Powerful | 10PM (Wed 9th Sep) | 11ft (3.5m) 18s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, let me tell you how it’s looking for Marengo over the next couple weeks.
Right now, we’ve got a solid pulse of south-west groundswell rolling in. The water’s sitting at 57° and that’s bang on average for this time of year, so no surprises there. The big story is a long-period, 18 second groundswell building out of the SW, packing a massive punch of energy — we’re talking a combined swell energy reading of 7452 (that’s strong to very strong). But that big, clean energy comes with a caveat right now: Wednesday afternoon the wind is a cross-off from the SW at 16 mph, which will keep the lineup tidy enough but it’s a big 12 ft swell. That size is well into expert-only territory, especially with that very long period that’ll make it lurchy and powerful at the reef-and-point setup here. Not one to mess with if you’re not on your game.
By Thursday the 10th, swell holds in the 10 ft range out of the SSW with 16 second periods. Morning looks cleaner with lighter cross-off winds. Still big, still only for experienced surfers. Crowds at Marengo can be around sometimes, but with this size, it’ll thin the pack a little.
Friday the 11th sees the swell drop to a more manageable 8 ft, period still at a nice 15 seconds. Morning glassy conditions with those light cross-off winds out of the SSW — this is where things start to look good for a decent session if you’ve got the skills.
Now, here’s the standout: Wednesday the 16th. Morning glass — dead calm with an SSE breeze, virtually no wind. We’ve got a 8 ft SW groundswell at 16 seconds and the combined energy is 4425 — still strong, powerful, long-period, groundswell. That means clean, lined-up waves on the point at Marengo. It’s still solid, so I’d say experienced surfers are going to have a cracker. After that, winds go cross-onshore in the afternoon and it gets a bit bumpy.
As we head deeper into the second week, things drop off. The weekend of the 13th and 14th fades to around 4 ft – 2 ft with periods dropping to 13 seconds. That’s weak, and by Monday the 14th afternoon the wave energy drops to just 190. Not worth paddling out. There’s a blank stretch there with barely anything rideable.
We do see a small rebound around Tuesday the 15th, with a 7 ft SW swell and 13 second period — but the combined energy is moderate at 1867. Winds stay cross-off and clean, and this makes the Tuesday morning session look okay for intermediates, if only for a few hours.
By the 20th we get another pulse of SW groundswell, 5 ft but with 16 second period: combined energy at 1163 — moderate — and light offshore NW winds. That Sunday morning looks like a nice mellow window for a mixed bunch, but it’s not going to hassle the Wednesday session as the top call.
Overall, the clear winner is Wednesday the 16th morning. Strong, glassy, clean groundswell. If you can make it, that’s your day.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Sat morning, min 9°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Sun morning, min 11°C on Mon night). Winds increasing (light winds from the ESE on Sat afternoon, fresh winds from the W by Mon afternoon). | |||||||||||||||||||
Wed 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 16 | SW 15 | SW 14 | SW 13 | SW 11 | SW 13 | SW 14 | SW 14 |
Wave Graph | ||||||||||||||||||||
7452 | 8323 | 5419 | 3842 | 2392 | 2276 | 3178 | 3098 | 1951 | 1581 | 1169 | 809 | 683 | 410 | 221 | 176 | 2241 | 1510 | 1975 | 1633 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross | glassy | cross-on | on | cross | cross | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | glassy |
High Tide | 11:28PM1.87m | 11:23AM1.61m | 00:17AM1.97m | 12:30PM1.85m | 00:56AM2.06m | 1:20PM2.08m | 1:32AM2.11m | 2:03PM2.25m | 2:04AM2.12m | 2:41PM2.36m | 2:34AM2.10m | 3:17PM2.38m | 3:03AM2.04m | |||||||
Low Tide | 4:21PM0.66m | 5:54AM0.97m | 5:43PM0.62m | 6:36AM0.75m | 6:42PM0.57m | 7:11AM0.53m | 7:29PM0.53m | 7:45AM0.36m | 8:10PM0.52m | 8:17AM0.23m | 8:47PM0.54m | 8:47AM0.16m | 9:22PM0.59m | |||||||
— | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | |
6:08 | — | — | 6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:13 | — | — | 6:13 | — | — | 6:14 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 11 | 10 | 12 | 12 | 10 | 13 | 12 | 10 | 17 | 17 | 16 | 23 | 22 | 19 | 17 | 16 | 12 | 12 | 12 | 10 |
Feels °C | 5 | 6 | 7 | 8 | 8 | 10 | 9 | 8 | 14 | 14 | 13 | 19 | 19 | 15 | 11 | 11 | 6 | 6 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 16 | SW 15 | SW 14 | SW 13 | SW 12 | SW 13 | SW 14 | SW 14 |
7452 | 8323 | 5419 | 3842 | 2392 | 2276 | 3178 | 3098 | 1951 | 1581 | 1169 | 809 | 683 | 410 | 221 | 176 | 1269 | 1510 | 1975 | 1633 | |
Swell 2 Height (m) Direction Period (s) | — | SSE 18 | — | — | SW 26 | — | — | S 16 | — | S 17 | — | — | NE 4 | W 21 | S 10 | SW 19 | SW 18 | SW 16 | S 14 | — |
— | 32 | — | — | 26 | — | — | 5 | — | 6 | — | — | 2 | 9 | 17 | 14 | 49 | 357 | 4 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 5 | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | N 3 | N 3 | — | — | WSW 6 | SW 11 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | 8 | 2 | — | — | 26 | 2241 | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1613 | 76 | 2 | 130 | 0 | 0 | 123 | 0 | 18 | 35 | 18 | 20 | 21 | 0 | 0 | 2 | 59 | 723 | 130 | 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.










