Surf Forecasts:
Marengo surf forecast from 20 Aug 2026:
- Best quality surf: Friday 21 Aug, 1PM (local time) - 10ft (3.0m), 14s period, WSW swell with offshore winds.
- Most powerful swell: Saturday 22 Aug, 7AM (local time) - 15ft (4.5m), 15s period, WSW swell with 9,566 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 7AM (local time) - 3.5ft (1.1m), 16s 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 Friday (Aug 21) at 7AM. The primary swell is predicted to be 1.1m and 16s period with a secondary swell of 0.5m and 7s. Another secondary swell of 2.0m and 7s 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 4.5m 15s and forecast to arrive on Saturday (Aug 22) at 7AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Aug 25) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Fri 21st Aug) | 3.5ft (1.1m) 16s |
| Best Surf | 1PM (Fri 21st Aug) | 10ft (3.0m) 14s |
| Most Powerful | 7AM (Sat 22nd Aug) | 15ft (4.5m) 15s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, Rusty here for the Marengo region.
We’ve got the ball rolling Thursday afternoon, but you don’t have to wait long. It starts small. Marengo is a reef and point, and the water’s about 57°, pretty standard for this spot this time of year. Swell is only 2ft from the WSW, with a light cross-offshore NW breeze. It’s clean and easy for the rookies.
Friday morning cleans up nicely. A 4ft SW groundswell comes in with a 15-second period, and offshore W winds. That’ll give you some nice walls, combined energy is moderate (781). By Friday afternoon, we’re looking at a serious 10ft from the WSW, still offshore from the WNW. That’s big. Combined energy jumps to strong (4289). Experts only.
Saturday is the big dog. Both sessions are 15ft from the WSW. The morning sits on a 15-second period and combined energy hits 11726 – that’s a machine. Offshore W winds all day. It’s a stand out day for experts with tide playing a small part.
Sunday stays solid. Morning offers 6ft from the SW and a cross-off wind. Afternoon is 7ft, 16-second period, light offshore SW breeze. Clean, strong, and powerful with combined energy still strong at 1929. Another great one.
Monday (24th) has about 5ft with cross-off wind, still clean. Tuesday gets messy with onshore S winds and 8 to 10ft of swell – not a paddle session, more for the kite boarders with that cross-shore chop.
The end of the week sees smaller, clean waves again. Thursday (27th) afternoon gives us a very long 21-second period swell at 2ft, with a light offshore breeze. It’s small, but the reef will love that drawn-out period.
Heading into September, Tuesday morning (1st) has a short period 5ft from the WSW, glassy conditions. Then Wednesday afternoon (2nd) booms up to 15ft from the WSW again, with combined energy at 6814 – big and powerful, but light cross-shore winds might make it wall up.
The standout of the second week is Friday afternoon (4th of September). A clean 15ft of WSW swell, 15-second period, and strong offshore W winds. Combined energy sits at 11699. That’s massive, clean, and only for the experts. The morning of that day comes in at 8ft but with a 30 km/h wind, so the afternoon is the premium window.
Two big moments: Saturday, 22nd of August, and Friday afternoon, 4th of September. Both are heavy, clean, and will be packed with the locals who know.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu afternoon. Very mild (max 15°C on Sun morning, min 9°C on Thu afternoon). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Mon night. Very mild (max 17°C on Mon morning, min 9°C on Tue night). Winds increasing (light winds from the NNW on Sun afternoon, fresh winds from the S by Tue night). | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | WSW 14 | WSW 16 | SW 15 | WSW 14 | WSW 16 | WSW 15 | WSW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 14 | WSW 14 | SW 13 | SW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 166 | 452 | 516 | 3420 | 7505 | 9409 | 7908 | 2416 | 1418 | 1929 | 1361 | 902 | 787 | 804 | 3416 | 2392 | 1787 | 663 | 653 | 167 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | off | cross-off | off | off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-off | cross | cross-off | off |
High Tide | 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 | 10:52AM1.33m | 00:32AM1.91m | |||||||
Low Tide | 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 | 6:44AM1.17m | 5:21PM0.71m | ||||||||
 |  |  | | | |  | | | | | | |  |  |  |  | | |  | |
 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — |
 | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:57 | — |
mm | 7 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | 2 | — | — | — |
Temp °C | 14 | 11 | 13 | 12 | 12 | 14 | 13 | 12 | 15 | 14 | 12 | 17 | 16 | 12 | 13 | 11 | 10 | 12 | 11 | 8 |
Feels °C | 11 | 7 | 8 | 7 | 7 | 8 | 7 | 9 | 12 | 11 | 9 | 14 | 13 | 10 | 8 | 4 | 3 | 7 | 5 | 4 |
Swell 1 Height (m) Direction Period (s) | WSW 14 | WSW 16 | SW 15 | WSW 14 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 12 | SW 11 | SW 14 | WSW 14 | SW 13 | SSW 9 |
| kJ | 166 | 452 | 516 | 701 | 1611 | 2295 | 2247 | 2416 | 1418 | 1929 | 1361 | 902 | 787 | 804 | 677 | 690 | 1787 | 663 | 653 | 100 |
Swell 2 Height (m) Direction Period (s) | SW 16 | E 7 | SW 6 | SW 18 | — | SW 24 | SW 21 | SW 20 | SW 18 | — | S 15 | — | SW 20 | SW 18 | SW 17 | SW 16 | S 13 | SSW 12 | — | SW 13 |
| kJ | 132 | 1 | 33 | 168 | — | 22 | 117 | 306 | 679 | — | 4 | — | 15 | 82 | 410 | 376 | 3 | 317 | — | 167 |
Swell 3 Height (m) Direction Period (s) | E 8 | — | WSW 20 | — | — | — | — | S 15 | — | — | — | — | — | — | SW 13 | SW 13 | — | — | — | SW 16 |
| kJ | 5 | — | 149 | — | — | — | — | 4 | — | — | — | — | — | — | 88 | 175 | — | — | — | 91 |
Wind waves Height (m) Direction Period (s) | — | WNW 2 | WSW 7 | WSW 14 | WSW 16 | WSW 15 | WSW 14 | — | — | — | — | — | — | NNW 3 | SW 13 | SW 13 | — | — | — | — |
| kJ | — | 1 | 83 | 3420 | 7505 | 9409 | 7908 | — | — | — | — | — | — | 6 | 3416 | 2392 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 21 | 0 | 0 | 21 | 2 | 2 | 0 | 0 | 0 | 0 | 21 | 0 | 0 | 123 | 351 | 241 | 373 | 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.
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