
Surf Forecasts:
Marengo surf forecast from 8 Sep 2026:
- Best quality surf: Thursday 10 Sep, 4AM (local time) - 11ft (3.5m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 10AM (local time) - 11ft (3.5m), 19s period, SW swell with 8,450 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 4AM (local time) - 11ft (3.5m), 17s period with SSW 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 19s and forecast to arrive on Wednesday (Sep 09) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Monday (Sep 14) at 10AM.
| 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 | 10AM (Wed 9th Sep) | 11ft (3.5m) 19s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Morning surfers, it’s Rusty here. The ocean’s got a bit of a story to tell over the next couple of weeks, so let’s get into it.
We’re starting off with a bang at Marengo (Marengo). Wednesday morning sees a solid 12ft SW swell pushing through with a 19-second period. That’s strong, powerful groundswell energy (15182) and the water’s sitting at 57°, which is pretty much spot on for this time of year. The wind’s blowing SSW at 19 mph, cross-off, so there’s some texture on it, but it’s still clean. This is proper juice, though – definitely for experienced surfers only at this size. The afternoon drops slightly to 12ft but the swell eases a touch in period and energy, still a heavy day.
The following day, Thursday, the swell eases back a notch to a still-chunky 10ft from SW, 16-second period, with lighter cross-off winds. Mornings are cleaner, with a gentle breeze, but the afternoon gets a touch more wind. There’s still plenty of power here (5419 energy in the morning), but it’s getting a bit more manageable.
By Friday morning, the swell has dropped to a more user-friendly 7ft, still SW, with a 15-second period and only a slight air moving offshore. This is looking like the cleanest, glassiest window we’ve seen so far. Conditions are rated excellent for experienced surfers, and the light winds will have it looking tempting. Afternoon gets a little cross-shore, but the morning is the call.
The weekend gets smaller – Saturday down to 7ft and then 6ft, with light cross-onshore winds that put a few ripples on the face. It’s still surfable, but nothing special. Sunday drops further – 5ft and then 4ft with NW winds picking up to 12 mph, making it a bit messy. This is the lull in the action.
Monday the 14th sees a big drop in energy – only 3ft in the morning with a fresh offshore WNW breeze. It’s clean but tiny, and honestly barely worth paddling out for. The afternoon is even smaller and windier. This is a gap of a few days with not much on offer.
The ocean comes back to life on Tuesday the 15th. A new SW swell pushes back up to 8ft, with a 14-second period and clean cross-off winds. Energy jumps back up (2528 in the morning). Wednesday the 16th is looking like a real standout. Morning is dead glass, 8ft SW with 16-second period, and the afternoon bumps to 8ft with very light cross-off breeze. This is clean, powerful, and rated excellent for experienced surfers. This is the one to circle.
Thursday the 17th holds decent size – 6ft in the morning with light cross-off wind, and the afternoon sees offshore winds at 12 mph. Still clean with good power. Friday the 18th has a morning light offshore, followed by a glassy afternoon at 6ft – another very clean, quality day.
The weekend again fades a touch – Saturday the 19th drops to 5ft then 4ft with a strong NNW breeze, losing the plot a bit. Sunday the 20th sees a slight bump in size to 8ft, but the period drops to 10 seconds in the morning, making it a bit short and crumbly. Afternoon straightens out to a 14-second period but still not amazing.
Now, looking ahead further out – Monday the 21st sees a new pulse, with a 6ft morning and then a solid 10ft SW swell in the afternoon, with good energy (4749). Tuesday the 22nd has a clean 8ft morning with light offshore winds. But the real long-range standout looks like Wednesday the 23rd – that afternoon brings a solid 12ft WSW groundswell with a 17-second period and a fresh offshore wind at 22 mph. That’s a powerful (9095 energy), heavy, and clean day, but it’s a week and a half away, so treat it as promising but not locked in.
So, the pick of the week is Wednesday the 16th – glassy, strong, and clean. And keep an eye on that 23rd – that could be a serious session for the experienced crew. For anyone who doesn’t like it big, the Friday morning and the following Friday afternoon look like the easiest windows.
Rusty out.
Short Range ForecastMostly dry. Very mild (max 13°C on Fri morning, min 9°C on Wed night). Winds decreasing (fresh winds from the SSW on Wed morning, calm by Fri afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Sun morning, min 11°C on Mon night). Winds increasing (light winds from the E on Sat morning, fresh winds from the W by Mon afternoon). | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 10 | SW 14 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||||
8450 | 7452 | 8323 | 5419 | 3842 | 2276 | 2061 | 2881 | 3059 | 1925 | 1561 | 1297 | 882 | 640 | 350 | 257 | 171 | 1622 | 2528 | 2050 | 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 | cross-off | off | cross-off | cross | glassy | cross-on | cross-on | cross | cross | cross-off | 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 | ||||||||
6:37 | — | — | 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 | 11 | 10 | 12 | 12 | 10 | 13 | 12 | 10 | 17 | 16 | 15 | 22 | 22 | 18 | 17 | 18 | 11 | 12 | 11 | 9 |
Feels °C | 3 | 5 | 6 | 8 | 8 | 8 | 10 | 9 | 8 | 14 | 13 | 12 | 18 | 19 | 16 | 11 | 11 | 4 | 6 | 7 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 19 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 11 | SW 14 | SW 14 | SW 14 |
8450 | 7452 | 8323 | 5419 | 3842 | 2276 | 2061 | 2881 | 3059 | 1925 | 1561 | 1297 | 882 | 640 | 350 | 257 | 171 | 817 | 2528 | 2050 | 1633 | |
Swell 2 Height (m) Direction Period (s) | — | — | SSE 18 | — | — | — | — | — | S 16 | S 16 | S 16 | — | S 16 | S 15 | SSW 10 | SW 20 | WSW 19 | SW 18 | — | — | — |
— | — | 32 | — | — | — | — | — | 5 | 20 | 5 | — | 5 | 4 | 33 | 15 | 36 | 49 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 4 | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 16 | — | — | — | — | — | — | — | — | — | — | — | N 3 | N 3 | — | W 5 | WSW 6 | SW 10 | — | — | — |
6732 | — | — | — | — | — | — | — | — | — | — | — | 8 | 2 | — | 62 | 24 | 1622 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 557 | 527 | 76 | 2 | 130 | 0 | 0 | 123 | 0 | 18 | 25 | 18 | 20 | 20 | 0 | 0 | 59 | 59 | 130 | 130 | 0 |
Best forecast wave conditions in Cape Otway | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










