Surf Forecasts:
Marengo surf forecast from 19 Aug 2026:
- Best quality surf: Friday 21 Aug, 4PM (local time) - 10ft (3.0m), 14s period, WSW swell with offshore winds.
- Most powerful swell: Friday 21 Aug, 4AM (local time) - 8ft (2.5m), 16s period, WSW swell with 3,341 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 10AM (local time) - 10ft (3.0m), 15s period with WSW 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 Friday (Aug 21) at 10AM. The primary swell is predicted to be 3.0m and 15s period with a secondary swell of 0.9m and 15s. Another secondary swell of 0.6m and 19s 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 2.5m 16s and forecast to arrive on Friday (Aug 21) at 4AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Wednesday (Aug 26) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Fri 21st Aug) | 10ft (3.0m) 15s |
| Best Surf | 4PM (Fri 21st Aug) | 10ft (3.0m) 14s |
| Most Powerful | 4AM (Fri 21st Aug) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Hey crew, Rusty here. Let’s run through the waves for the next couple of weeks.
The start of the outlook is flat, nothing doing until Friday, 21st of August, when the surf finally lights up.
Friday, 21st is the big one. We’ve got a solid 10 ft swell out of the WSW with a 15-second period, and the wind is blowing offshore. That’s a serious session for experienced surfers only. The energy is massive, hitting 4117 in the afternoon. The break is a reef and point setup, and the swell direction is close to the preferred SSW, so it should hold shape well.
Saturday, 22nd backs off a bit to 7 ft from the SW, still with offshore winds. The energy is still very high at 1951, and the conditions stay clean. Another excellent day for the skilled.
Sunday, 23rd goes 6 ft from the SW, with light cross-offshore winds. The afternoon turns glassy with a 3 mph breeze. The energy actually jumps to 2219, which is a lot of punch for that size. Clean, hollow lines.
The water is 57°F, which is pretty normal for this time of year.
After that, the swell fades. Monday, 24th drops to 4 ft with cross-offshore wind, but the energy is down to 746 – not great. The rest of the period is mostly poor, with onshore winds or small waves. There’s a blip on Friday, 28th of August with a 7 ft swell from the SW and a 17-second period, but the wind is cross-offshore with rain, so it’s not clean. Energy is high at 2267, but the quality is just marginal.
The real standouts are Friday, 21st and Saturday, 22nd – don’t miss them.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Wed morning. Very mild (max 14°C on Wed afternoon, min 10°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Mon afternoon. Very mild (max 16°C on Mon morning, min 9°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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 15 | WSW 15 | WSW 15 | SW 17 | WSW 14 | SW 16 | WSW 15 | WSW 14 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | WSW 13 | SSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 178 | 158 | 142 | 188 | 132 | 376 | 3333 | 3248 | 1456 | 1929 | 1823 | 1915 | 1238 | 1552 | 988 | 726 | 492 | 459 | 319 | 299 | 326 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-on | cross-on | on |
High Tide | 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 | 6:06AM1.41m | 10:43PM1.71m | 7:14AM1.29m | 11:50PM1.81m | ||||||||
Low Tide | 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 | 2:08PM0.69m | 6:21AM1.29m | 4:01PM0.74m | ||||||||
 |  |  |  | | |  | | | | | |  | |  | | |  | | | | |
 | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — |
 | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — |
mm | 7 | 2 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | 9 | 1 | — | — | 1 |
Temp °C | 13 | 14 | 14 | 13 | 13 | 10 | 13 | 13 | 12 | 13 | 13 | 12 | 15 | 14 | 14 | 16 | 14 | 11 | 12 | 12 | 11 |
Feels °C | 8 | 10 | 9 | 9 | 9 | 6 | 8 | 9 | 8 | 8 | 8 | 9 | 12 | 12 | 10 | 12 | 11 | 9 | 8 | 7 | 6 |
Swell 1 Height (m) Direction Period (s) | SW 15 | WSW 15 | WSW 15 | SW 17 | WSW 14 | SW 16 | WSW 15 | WSW 14 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 12 | WSW 13 | SSW 13 |
| kJ | 178 | 158 | 142 | 188 | 125 | 376 | 393 | 701 | 1456 | 1929 | 1823 | 1915 | 1238 | 1552 | 988 | 726 | 492 | 459 | 319 | 257 | 326 |
Swell 2 Height (m) Direction Period (s) | ESE 5 | ENE 6 | SW 18 | WSW 13 | SW 16 | WSW 7 | WSW 19 | SW 18 | — | SW 24 | SW 21 | SW 20 | SW 18 | SW 16 | — | SW 21 | NE 4 | SW 18 | SW 16 | SSW 13 | WSW 12 |
| kJ | 5 | 24 | 87 | 68 | 132 | 17 | 241 | 168 | — | 22 | 72 | 373 | 595 | 667 | — | 18 | 3 | 81 | 129 | 299 | 161 |
Swell 3 Height (m) Direction Period (s) | — | ESE 7 | ENE 5 | SW 8 | SW 7 | — | SW 7 | — | — | — | — | S 15 | — | — | — | — | WSW 20 | — | SSW 14 | WSW 16 | SW 14 |
| kJ | — | 5 | 2 | 16 | 12 | — | 21 | — | — | — | — | 5 | — | — | — | — | 37 | — | 74 | 166 | 169 |
Wind waves Height (m) Direction Period (s) | ENE 5 | NE 5 | NNW 2 | — | — | NW 3 | WSW 15 | WSW 14 | — | — | — | — | — | — | — | NNE 3 | NNW 3 | — | — | — | — |
| kJ | 16 | 32 | 1 | — | — | 2 | 3333 | 3248 | — | — | — | — | — | — | — | 2 | 1 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 214 | 20 | 21 | 21 | 21 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20 | 21 | 0 | 0 | 131 | 131 | 56 |
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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