Surf Forecasts:
Marengo surf forecast from 9 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 10PM (local time) - 13ft (4.0m), 17s period, SW swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 1PM (local time) - 15ft (4.5m), 15s period, SW swell with 10,012 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 7AM (local time) - 5ft (1.6m), 19s 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 Monday (Aug 10) at 7AM. The primary swell is predicted to be 1.6m and 19s period with a secondary swell of 0.8m and 4s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Marengo in the next 16 days are 4.5m 15s and forecast to arrive on Thursday (Aug 13) at 1PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Monday (Aug 10) at 7PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 10th Aug) | 5ft (1.6m) 19s |
| Best Surf | 10PM (Wed 12th Aug) | 13ft (4.0m) 17s |
| Most Powerful | 1PM (Thu 13th Aug) | 15ft (4.5m) 15s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, this is Rusty checking in on Marengo for the next couple of weeks. We’ve got some real meat on the bone coming, but you gotta be patient, and there’s a long flat spell in the middle.
Right now, it’s dead. Sunday’s got tiny 2-foot waves with a messy swell, cross-on wind, and hardly any energy. It’s poor.
Monday the 10th afternoon is where it starts. Swell jumps to 6 feet out of the southwest with a 19-second period, and moderate wave energy. Wind turns cross-offshore and light, so it’s clean, but that’s a real long-period groundswell—good for points and reefs, but at a beach break, it might be a bit too straight. Excellent for experienced surfers only. Water temp is 58°, right around average.
The big standout is Wednesday the 12th. Wednesday afternoon brings a massive 15-foot southwest swell with a 16-second period and a combined energy of (12537)—that’s a ton of power. Offshore wind holds it clean. That’s expert-only territory, and it’s the best wave of the whole forecast.
Thursday the 13th holds at 8 feet, still clean and offshore. Friday the 14th stays excellent with 10-foot southwest swell. Saturday the 15th is still going good with 7-foot swell and light cross-off winds.
Then it dies. From Sunday the 16th all the way through the next week until Monday the 24th, it’s all onshore winds and tiny, weak surf. That’s a full nine-day dry spell—don’t bother.
Your best bet, without question, is Wednesday afternoon the 12th. Huge, powerful, clean. Sunday the 14th morning is your second call. Everything after the 15th is a write-off until possibly Monday the 24th, but that’s way off.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Sun night. Very mild (max 13°C on Sun night, min 10°C on Mon night). Winds increasing (calm on Sun night, fresh winds from the NW by Tue night). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Wed afternoon. Very mild (max 14°C on Fri morning, min 11°C on Wed afternoon). Wind will be generally light. | |||||||||||||||||||
Sun 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 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 16 | SW 20 | SW 19 | SW 17 | SW 16 | SW 14 | SW 15 | SW 16 | SW 16 | WSW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 |
Wave Graph  | ||||||||||||||||||||
 kJ | 219 | 1030 | 1988 | 1579 | 989 | 746 | 757 | 1276 | 4869 | 9742 | 2384 | 2944 | 3023 | 2856 | 4941 | 3619 | 2197 | 1875 | 1695 | 1289 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-off | cross-off | off | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | off | off | cross-off | cross-off | cross-off | cross-on |
High Tide | 9:15PM1.87m | 6:52AM1.57m | 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 | |||||||
Low Tide | 2:53AM1.40m | 2:32PM0.36m | 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 | ||||||||
 |  | |  | |  | |  | | |  | | | | | | | | | | |
 | — | — | 7:18 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:11 | — | — |
 | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — |
mm | 4 | 5 | 3 | 1 | 1 | — | — | 3 | — | 2 | — | 1 | — | — | — | — | — | — | — | 1 |
Temp °C | 12 | 13 | 13 | 13 | 12 | 12 | 13 | 12 | 13 | 11 | 12 | 13 | 13 | 12 | 14 | 13 | 11 | 13 | 12 | 12 |
Feels °C | 8 | 11 | 8 | 8 | 7 | 7 | 8 | 5 | 7 | 5 | 8 | 8 | 8 | 9 | 9 | 8 | 8 | 10 | 9 | 10 |
Swell 1 Height (m) Direction Period (s) | ENE 6 | SW 20 | SW 19 | SW 17 | 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 14 |
| kJ | 45 | 1030 | 1988 | 1579 | 989 | 746 | 757 | 1276 | 2570 | 2770 | 2384 | 2944 | 3023 | 2856 | 4941 | 3619 | 2197 | 1875 | 1695 | 1289 |
Swell 2 Height (m) Direction Period (s) | SW 13 | SW 14 | E 5 | ESE 8 | S 6 | SW 7 | SW 19 | — | — | SSE 16 | — | SSE 15 | — | SSE 15 | SSE 17 | — | SE 12 | S 16 | — | — |
| kJ | 180 | 293 | 22 | 23 | 61 | 36 | 224 | — | — | 25 | — | 23 | — | 23 | 27 | — | 6 | 5 | — | — |
Swell 3 Height (m) Direction Period (s) | SW 16 | ESE 6 | — | — | SW 8 | SSE 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 219 | 11 | — | — | 82 | 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 5 | — | — | SSW 5 | SW 7 | — | N 3 | N 3 | SW 16 | WSW 16 | — | — | — | — | — | — | — | — | — | — |
| kJ | 72 | — | — | 35 | 301 | — | 8 | 5 | 4869 | 9742 | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 18 | 18 | 0 | 351 | 0 | 21 | 22 | 390 | 59 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
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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