Surf Forecasts:
Marengo surf forecast from 20 Aug 2026:
- Best quality surf: Saturday 22 Aug, 10AM (local time) - 13ft (4.0m), 15s period, WSW swell with offshore winds.
- Most powerful swell: Saturday 22 Aug, 10AM (local time) - 13ft (4.0m), 15s period, WSW swell with 7,747 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 1PM (local time) - 2.5ft (0.7m), 14s 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 Thursday (Aug 20) at 1PM. The primary swell is predicted to be 0.7m and 14s period with a secondary swell of 0.5m and 17s. 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 4.0m 15s and forecast to arrive on Saturday (Aug 22) at 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Monday (Aug 24) at 4AM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Thu 20th Aug) | 2.5ft (0.7m) 14s |
| Best Surf | 10AM (Sat 22nd Aug) | 13ft (4.0m) 15s |
| Most Powerful | 10AM (Sat 22nd Aug) | 13ft (4.0m) 15s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, Rusty here again. Let’s break down what’s coming at Marengo over the next couple of weeks.
Water temp is 57°, right around normal for this time of year. Nothing wild.
The first few days are small. Thursday the 20th has 2ft to 2ft of SW/WSW swell, with a cross-off breeze. It’s clean, but you’ll be working for every wave.
Then the juice starts flowing. Friday the 21st morning brings 7ft of W swell with offshore winds, energy at 1421. By afternoon, it’s 10ft from the WSW, 14-second period, energy jumping to 4514. That’s proper groundswell and it’s for experienced surfers only.
The real standout is Saturday the 22nd. 13ft of WSW swell, 15-second period, and the combined energy is a massive 9649. Offshore winds from the W, clear skies. This is a heavy, powerful groundswell – strictly for experts. Long period like that will make the sets clean and well-shaped at the reef and point, but the power is off the charts.
Sunday the 23rd drops to 6ft from the SW, with light offshore or cross-off winds. Energy at 1902 – still excellent for experienced surfers. Monday and Tuesday the 24th and 25th hold at 5ft to 5ft, clean, with offshore winds and 13-14 second periods. Good, solid intermediate days.
There’s a lull from Wednesday the 26th into Thursday the 27th – smaller, cleaner, but weaker. Not a total loss, but not the main event.
Thursday afternoon the 27th is glassy with 4ft of SW swell, 14-second period, energy 975. Could be a fun, quiet session.
Friday the 28th brings 6ft from the SW (17-second period, 1839 energy), but the wind goes cross-on then onshore. That’s a bust for paddle surfing – the wind will ruin it.
Saturday the 29th and Sunday the 30th are poor, with messy, lumpy conditions. Sunday the 30th has a tiny 2ft swell with a 20-second period, but it’s clean. Not worth the trip.
Monday the 31st sees a return: 4ft from the SW, 16-second period, 1232 energy, and light offshore or cross-off winds. Clean. Tuesday the 1st of September is similar but smaller.
Then it fades. Wednesday the 2nd through Friday the 4th is mostly small, weak, and often messy. The last entry Friday the 4th afternoon shows 2ft of SW swell, glassy, energy 377. Tiny, clean, and calm.
Best bet: Saturday the 22nd is the standout – big, clean, powerful, and for experts only. For a more manageable but still excellent session, go for Friday the 21st afternoon or Sunday the 23rd morning.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Thu afternoon. Very mild (max 14°C on Thu morning, min 9°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Mon afternoon. Very mild (max 16°C on Mon morning, min 8°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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 17 | WSW 14 | SW 16 | W 9 | WSW 14 | SW 16 | WSW 15 | WSW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 13 | SW 14 | WSW 14 | WSW 13 | SW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 188 | 166 | 376 | 679 | 3645 | 1474 | 7747 | 6223 | 1999 | 1307 | 1685 | 1076 | 821 | 799 | 744 | 769 | 563 | 482 | 332 | 222 | 191 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | off | off | off | off | off | off | cross-off | off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-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 | 11:01AM0.24m | 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 | 6:44AM1.17m | 5:21PM0.71m | ||||||||
 |  |  | | |  | | | |  | |  | | | | | | | | |  | |
 | 7:05 | — | — | 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 | — | 10 | — | — | — | 2 | — | — | — | — | — | — | — | 1 | — | — | 1 | 2 | — | — | — |
Temp °C | 14 | 14 | 10 | 13 | 13 | 12 | 13 | 13 | 12 | 15 | 15 | 13 | 16 | 14 | 11 | 12 | 13 | 10 | 12 | 12 | 8 |
Feels °C | 10 | 10 | 5 | 8 | 8 | 8 | 7 | 8 | 9 | 12 | 12 | 9 | 11 | 10 | 8 | 7 | 8 | 6 | 8 | 7 | 5 |
Swell 1 Height (m) Direction Period (s) | SW 17 | WSW 14 | SW 16 | WSW 15 | WSW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 13 | SSW 12 | WSW 14 | SSW 11 | SW 11 |
| kJ | 188 | 166 | 376 | 468 | 701 | 1474 | 1880 | 1784 | 1999 | 1307 | 1685 | 1076 | 821 | 799 | 744 | 769 | 563 | 341 | 332 | 163 | 191 |
Swell 2 Height (m) Direction Period (s) | WSW 13 | SW 16 | WSW 6 | SW 6 | SW 18 | — | SW 24 | SW 21 | SW 20 | SW 18 | — | S 15 | W 21 | SW 20 | WSW 18 | WSW 13 | WSW 13 | SW 14 | SSW 12 | WSW 13 | SW 16 |
| kJ | 68 | 132 | 16 | 33 | 168 | — | 22 | 72 | 306 | 595 | — | 4 | 9 | 15 | 32 | 111 | 209 | 482 | 215 | 222 | 124 |
Swell 3 Height (m) Direction Period (s) | WSW 7 | E 8 | E 7 | WSW 19 | — | — | — | — | S 15 | — | — | — | — | WSW 20 | — | WSW 17 | SW 16 | — | SW 19 | SW 18 | WSW 13 |
| kJ | 11 | 5 | 1 | 241 | — | — | — | — | 4 | — | — | — | — | 38 | — | 200 | 264 | — | 14 | 49 | 62 |
Wind waves Height (m) Direction Period (s) | — | — | WNW 3 | W 9 | WSW 14 | — | WSW 15 | WSW 15 | — | — | — | — | NE 4 | — | — | — | — | — | — | — | — |
| kJ | — | — | 2 | 679 | 3645 | — | 7747 | 6223 | — | — | — | — | 4 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 21 | 0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 20 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 59 | 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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