
Surf Forecasts:
Marengo surf forecast from 5 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 7PM (local time) - 18ft (5.5m), 16s period, SW swell with offshore winds.
- Most powerful swell: Wednesday 12 Aug, 10PM (local time) - 20ft (6.0m), 16s period, SW swell with 17,059 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 1AM (local time) - 2.5ft (0.7m), 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 (Aug 06) at 1AM. The primary swell is predicted to be 0.7m and 17s period with a secondary swell of 0.7m and 12s. 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 6.0m 16s and forecast to arrive on Wednesday (Aug 12) 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 1.0m 5s period and expected on Thursday (Aug 06) at 4PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Thu 6th Aug) | 2.5ft (0.7m) 17s |
| Best Surf | 7PM (Wed 12th Aug) | 18ft (5.5m) 16s |
| Most Powerful | 10PM (Wed 12th Aug) | 20ft (6.0m) 16s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, let’s talk about the surf ahead. The long-range picture for Marengo is a slow burn, but there’s some serious size lurking a week out. This is a reef and point set-up that loves a good SW groundswell, and when it all lines up, it’s a sight to see. The water temp is sitting at 57°F, which is about average for this time of year, so a good hood is still your best mate.
We start off quiet. Wednesday afternoon is a write-off, with showers and 6ft of SW swell but only 14 seconds of period. It’s there, but it’s not doing much. The energy is moderate at 1457, but the wind is a moderate offshore, so it might be clean but underwhelming. Thursday and Friday are pretty grim too, with small, weak swell and cross-off winds that aren't doing anyone any favors. It’s a flat spell, really. The first few days are a bit of a tease, just waiting for something to happen.
The first real sign of life comes on Saturday the 10th. The morning has a fresh offshore blowing and 6ft of SW swell at 18 seconds, the energy is ramping up to 2766. It’s a decent option for the more experienced crew. But the standout is that afternoon. The swell jumps to 12ft, the period is still solid at 17 seconds, and the energy is pumping at 8600. That’s moderate-to-strong energy, and with a moderate offshore wind, it’s going to be a proper session for experts only. This is the first true standout of the window.
Then it gets a bit wild. The swell eases back a touch for the 11th, and then on Wednesday the 12th, it’s back on. Morning has 10ft at 18 seconds with a fresh offshore, and the afternoon pushes to 12ft. It’s a big, powerful swell, but the wind is fresh, so it’s going to be a battle. It’s rated as a good option, but it’s for the strong paddlers.
Now, for the big one. Thursday the 13th. The morning forecast is huge. We’re talking 25ft of SW swell. That’s a monster. The combined energy is off the charts at 43643, which is very strong. But the call is that it's simply too big for this break, even with favorable wind. It will be a washing machine. The afternoon settles down to a still-massive 15ft at 18 seconds, with a gentle offshore breeze. The energy is still through the roof at 10917, and the word is “exceptional” for experts. This is the standout of the whole forecast. If you're a charger and you know Marengo, this is the window you've been waiting for. It’s a long-period groundswell, so it’s going to be powerful and lined up on the reef.
The week after that settles into a run of solid, clean surf. Friday the 14th has 10ft in the morning and 8ft in the afternoon, with clean offshore winds. Saturday the 15th is similar, with 10ft waves and light winds, looking really good. Even Sunday morning the 16th, with 6ft of swell and a glassy, calm ocean, will be a fun, clean session before the onshores arrive later in the day. It stays rideable for the next few days, with a mix of cross-off and cross-shore winds, but nothing else comes close to that Thursday.
If you’re not an expert, watch out for the 10th, 12th, and especially the 13th. That’s charger territory. For everyone else, the 15th and 16th mornings look like the most user-friendly windows with clean conditions and solid, manageable waves.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Wed afternoon. Very mild (max 16°C on Sat morning, min 8°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Sun night. Very mild (max 16°C on Sat afternoon, min 9°C on Sun night). Winds decreasing (strong winds from the SW on Sun night, light winds from the NW by Mon afternoon). | |||||||||||||||||||
Wed 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
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 17 | SW 16 | SW 16 | SW 17 | SW 16 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | WSW 14 | SW 16 | SW 21 | SW 18 | SW 17 | SW 16 | SW 14 | SW 14 | SW 20 |
Wave Graph | ||||||||||||||||||||
1130 | 290 | 248 | 299 | 594 | 976 | 640 | 1199 | 813 | 849 | 614 | 328 | 219 | 2050 | 2014 | 6358 | 1317 | 676 | 521 | 2865 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | off | cross-off | on | cross | cross-off | cross | cross | cross | cross | cross-off | off | off | cross-off | cross-off | cross-off | off |
High Tide | 5:00PM2.02m | 4:27AM1.93m | 5:46PM2.00m | 4:53AM1.85m | 6:41PM1.95m | 5:22AM1.77m | 7:49PM1.89m | 5:59AM1.68m | 9:15PM1.87m | 6:52AM1.57m | 10:40PM1.93m | 8:40AM1.47m | 11:47PM2.03m | |||||||
Low Tide | 10:47PM0.82m | 11:00AM0.18m | 11:25PM0.97m | 11:37AM0.15m | 00:09AM1.14m | 12:20PM0.18m | 1:06AM1.29m | 1:16PM0.26m | 2:53AM1.40m | 2:32PM0.36m | 5:03AM1.33m | 4:09PM0.42m | ||||||||
— | — | 7:22 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:16 | — | — | |
5:37 | — | — | 5:38 | — | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | |
mm | 1 | — | — | 1 | — | — | — | — | — | — | 5 | 5 | 4 | 8 | — | — | — | — | — | 4 |
Temp °C | 11 | 10 | 12 | 11 | 11 | 14 | 14 | 12 | 16 | 16 | 13 | 11 | 14 | 11 | 13 | 12 | 11 | 15 | 14 | 11 |
Feels °C | 7 | 7 | 7 | 6 | 8 | 12 | 12 | 8 | 11 | 12 | 8 | 5 | 10 | 4 | 6 | 6 | 6 | 10 | 9 | 5 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 12 | SW 16 | SW 16 | SW 17 | SW 16 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | WSW 14 | SW 13 | SW 21 | SW 18 | SW 9 | SW 16 | SW 14 | SW 14 | SW 20 |
206 | 148 | 248 | 299 | 594 | 976 | 640 | 1199 | 813 | 849 | 614 | 328 | 178 | 2050 | 2014 | 551 | 1317 | 676 | 521 | 2865 | |
Swell 2 Height (m) Direction Period (s) | S 8 | SW 17 | S 8 | SSW 8 | WSW 14 | SSW 6 | SW 19 | SSW 6 | — | — | ENE 5 | SW 18 | SW 16 | NE 6 | E 8 | SW 17 | S 8 | S 7 | SW 19 | SW 20 |
86 | 290 | 33 | 26 | 140 | 22 | 427 | 12 | — | — | 10 | 50 | 219 | 16 | 5 | 1682 | 118 | 26 | 59 | 2011 | |
Swell 3 Height (m) Direction Period (s) | SW 8 | S 9 | SW 11 | E 9 | SSW 8 | SW 19 | S 6 | — | — | — | — | — | WSW 24 | NNE 6 | — | ESE 10 | — | — | E 12 | — |
35 | 57 | 33 | 2 | 37 | 96 | 20 | — | — | — | — | — | 55 | 60 | — | 9 | — | — | 3 | — | |
Wind waves Height (m) Direction Period (s) | SW 14 | — | WNW 3 | W 5 | — | — | — | — | NNE 4 | NE 4 | NE 5 | ENE 5 | NE 6 | W 4 | SW 10 | SW 17 | — | N 3 | NNW 3 | — |
1130 | — | 4 | 52 | — | — | — | — | 17 | 9 | 26 | 19 | 43 | 17 | 752 | 6358 | — | 4 | 3 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 2 | 21 | 0 | 0 | 18 | 20 | 20 | 20 | 157 | 214 | 20 | 289 | 59 | 0 | 21 | 22 | 22 | 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.











