Surf Forecasts:
Marengo surf forecast from 24 Aug 2026:
- Best quality surf: Sunday 30 Aug, 7PM (local time) - 7ft (2.2m), 18s period, SW swell with glassy winds.
- Most powerful swell: Monday 31 Aug, 1AM (local time) - 8ft (2.5m), 18s period, SW swell with 3,999 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 1PM (local time) - 4.5ft (1.3m), 13s period with SSW 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 Tuesday (Aug 25) at 1PM. The primary swell is predicted to be 1.3m and 13s period with a secondary swell of 0.7m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Marengo in the next 16 days are 2.5m 18s and forecast to arrive on Monday (Aug 31) at 1AM. Winds are predicted to be cross-shore 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 10PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Tue 25th Aug) | 4.5ft (1.3m) 13s |
| Best Surf | 7PM (Sun 30th Aug) | 7ft (2.2m) 18s |
| Most Powerful | 1AM (Mon 31st Aug) | 8ft (2.5m) 18s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s see what’s shaping up for Marengo.
We’re starting slow, but building into a really nice run of SW groundswell, with a couple days that are absolute crackers. Tuesday morning the 25th is a bit of a wash with light cross-on wind and 5ft of swell, but it’s not the best. It cleans up that afternoon though, dropping to 4ft and cross-off – much smoother. Wednesday’s similar, clean but small. Not the standout.
Friday the 28th is where it starts getting good. Morning has 4ft of SW swell with an 18 second period – real groundswell – and it’s clean. The energy is moderate at 1182. But Friday afternoon is the first real gem: 5ft, 17 seconds, clean, and energy at 1355. That’s excellent for experienced surfers. Marengo is a reef and point, so that long period will wrap in beautifully, giving you well-shaped, punchy sets. Crowds can be an issue sometimes, so get on it early.
Saturday the 29th morning is a glass-off: flat calm, 4ft of SW swell at 14 seconds. Just lovely. Sunday the 30th morning is also glassy at 4ft, but the afternoon is the standout: 6ft, 15 second period, clean, energy at 1439. Solid. But the best of the whole run is Monday the 31st. Morning is glassy with 8ft of SW swell at a very long 17 seconds – that’s big, powerful, and clean. The energy is 3455. That’s expert territory. The afternoon holds at 7ft, also glassy. That’s your absolute best session.
We hit some onshore wind on Wednesday the 2nd of September, which messes things up. Thursday the 3rd is small and glassy, only around 3ft. Friday the 4th morning bounces back with a clean 5ft, 15 second groundswell, but the afternoon gets choppy with a light cross-shore.
The second week goes huge. Saturday the 5th brings 10ft in the morning and 8ft in the afternoon, both clean but big. Then Sunday the 6th is a monster: 23ft of swell. That’s way too big for Marengo, even with offshore wind. Monday the 7th drops to a still gigantic 13ft in the morning and 12ft in the afternoon, with offshore winds and exceptional conditions for experts only. The energy readings are off the charts – 8896 and 6910. Not for the faint of heart.
Water temp is about normal for this time of year, no wild swings.
So, bottom line: your top pick is Monday the 31st of August, glassy, 8ft, long-period SW. Runner-up is Friday the 28th afternoon, 5ft, clean, long-period power. For the second week, Monday the 7th is the one if you’re an absolute charger.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Mon night. Very mild (max 14°C on Thu morning, min 8°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 12°C on Fri morning, min 7°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 13 | SW 13 | SW 13 | SSW 12 | SSW 12 | SW 13 | SSW 12 | SSW 11 | SW 21 | SW 19 | SW 18 | SW 17 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 15 | SW 18 |
Wave Graph  | |||||||||||||||||||
 kJ | 604 | 846 | 479 | 436 | 392 | 700 | 246 | 194 | 127 | 376 | 711 | 1351 | 906 | 746 | 469 | 249 | 424 | 1396 | 3999 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | cross-off | cross-off | glassy | cross-off | cross |
High Tide | 10:43PM1.71m | 7:14AM1.29m | 11:50PM1.81m | 10:52AM1.33m | 00:32AM1.91m | 12:05PM1.48m | 1:03AM2.01m | 12:54PM1.66m | 1:30AM2.07m | 1:34PM1.85m | 1:54AM2.10m | 2:10PM2.02m | 2:18AM2.10m | ||||||
Low Tide | 6:21AM1.29m | 4:01PM0.74m | 6:44AM1.17m | 5:21PM0.71m | 7:04AM1.03m | 6:16PM0.66m | 7:25AM0.89m | 7:00PM0.61m | 7:46AM0.73m | 7:39PM0.57m | 8:08AM0.57m | 8:14PM0.56m | |||||||
 |  |  |  |  | |  | |  | |  | | | | | | | | | |
 | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — |
 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — |
mm | 6 | 5 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 12 | 13 | 11 | 13 | 12 | 9 | 14 | 13 | 11 | 12 | 12 | 9 | 11 | 10 | 9 | 12 | 12 | 10 |
Feels °C | 11 | 12 | 11 | 6 | 9 | 8 | 7 | 12 | 11 | 8 | 10 | 9 | 8 | 8 | 7 | 7 | 10 | 10 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SSW 12 | SSW 12 | SW 13 | SSW 12 | SSW 11 | SSW 11 | WSW 13 | SW 14 | SW 17 | SW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 15 | SW 18 |
| kJ | 604 | 846 | 479 | 436 | 392 | 700 | 246 | 194 | 117 | 313 | 471 | 1351 | 906 | 746 | 469 | 249 | 424 | 1396 | 3999 |
Swell 2 Height (m) Direction Period (s) | SW 18 | E 4 | SW 16 | WSW 14 | SW 14 | — | SW 13 | WSW 12 | WSW 14 | SW 19 | SW 18 | SE 10 | S 6 | — | S 7 | S 8 | SSW 16 | S 16 | S 17 |
| kJ | 50 | 9 | 264 | 367 | 297 | — | 175 | 79 | 127 | 376 | 711 | 4 | 28 | — | 40 | 46 | 322 | 43 | 49 |
Swell 3 Height (m) Direction Period (s) | S 14 | WSW 17 | WSW 13 | ESE 5 | SW 18 | — | SW 16 | SW 15 | SW 21 | S 10 | — | — | — | — | SW 23 | SW 21 | SW 20 | — | — |
| kJ | 4 | 108 | 147 | 2 | 12 | — | 90 | 75 | 113 | 53 | — | — | — | — | 21 | 72 | 134 | — | — |
Wind waves Height (m) Direction Period (s) | — | ENE 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 18 | 0 | 0 | 37 | 131 | 0 | 0 | 0 | 21 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 18 |
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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