Surf Forecasts:
Marengo surf forecast from 16 Aug 2026:
- Best quality surf: Saturday 22 Aug, 4PM (local time) - 7ft (2.1m), 15s period, SW swell with offshore winds.
- Most powerful swell: Friday 21 Aug, 10PM (local time) - 15ft (4.5m), 16s period, WSW swell with 8,956 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 4AM (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 4AM. The primary swell is predicted to be 0.7m and 14s period with a secondary swell of 0.4m and 19s. 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 16s and forecast to arrive on Friday (Aug 21) at 10PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Tuesday (Aug 18) at 10PM.
| Wave Type | Time (AEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Thu 20th Aug) | 2.5ft (0.7m) 14s |
| Best Surf | 4PM (Sat 22nd Aug) | 7ft (2.1m) 15s |
| Most Powerful | 10PM (Fri 21st Aug) | 15ft (4.5m) 16s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
Alright, mates, Rusty here. Let’s look at the next couple of weeks for our stretch of coast. It’s a mixed bag, so let’s get into it.
The next week to ten days are pretty quiet. There’s swell around, but it’s small and the winds are mostly junk, so we’re looking at a long stretch of waiting for something clean to show up. The first real glimmer of hope comes on Thursday, August 20th, but even then it’s tiny. The bigger push arrives later, and that’s where the real story is.
Right now, this Sunday morning the 16th, we’ve got a weak 4ft SW swell with a 14-second period. The combined energy is moderate at 929, and it’s clean with a light ESE breeze, but it’s marginal. Water temp is 57°, which is about average for this time of year. It’s a knee-high dribble at best, not worth getting wet for. The afternoon sees a bit more wind and the same small surf.
Monday and Tuesday are more of the same story. Monday gets a touch of size, up to 5ft, but the wind swings ENE and it gets messy. Tuesday drops back to 3ft with onshore NE winds. We’re in a pretty flat, poor stretch here, mates. The first days are a write-off.
Wednesday the 19th is a true blank day. The swell tanks to 2ft with a fresh N cross-shore wind and some rain. No chance of a wave. The combined energy is weak, around 209. This is a do-nothing day, maybe go for a surf check and a coffee.
Thursday the 20th sees the wind finally go offshore (WNW) but it’s only 2ft of SW swell with a 17-second period. The energy is low (274), and it’s clean, but there’s just nothing to ride. It’s a knee-high cleanup, not a surf.
Finally, Friday the 21st starts to show some life. The swell bumps to 4ft with a 15-second period, and by the afternoon the wind is offshore and clean, and the period stretches to 18 seconds. Combined energy is up to 1018 – moderate. This is the first session that has a bit of potential, but we’re still talking clean, shoulder-high waves on the best sets. The tide might be a factor, so pick your banks.
Then things kick off for the weekend. Saturday the 22nd is the first real standout. The morning sees 15ft of groundswell from the SW with a 14-second period. That’s a lot of water. The combined energy is a hefty 11218 – that’s strong. The wind is cross-off and it’s clean, but this is only for the experts. This is a big, powerful day. The afternoon drops to 7ft and is more manageable, but still serious. Sunday the 23rd has decent 7ft swell but the wind is fresh from the NW, making it a bit lumpy and difficult to read.
But the true highlight, the one you want to clear your calendar for, is Monday the 24th of August. We’ve got a massive 15ft to 16ft SW groundswell, with a 14-second period, and a solid offshore W wind. The combined energy numbers are huge – over 10,000 to 12,000. This is a powerful, grinding, expert-only day. The wave quality is rated excellent, but it will be heavy and take no prisoners. If you’re not a seasoned charger, this is a spectator day. This is the biggest and best on offer.
After that, the swell backs down but the winds get messy for a few days. Tuesday the 25th sees 8ft dropping to 7ft, but the wind is cross-shore and choppy. Wednesday the 26th drops to 4ft with onshore winds. The rest of that week is smaller, in the 3-6ft range, with mixed winds. There’s a fun-looking Thursday the 27th with a long 18-second period but the winds are light and cross, which might make it clean at certain spots.
For the final days, the 29th and 30th look like the cleaner, more user-friendly options. Saturday the 29th has 4ft to 4ft with light winds early. Sunday the 30th sees a bit more size at 5ft with a long 17-second period, but the wind is a cross-off. These are the sessions for the average surfer to get back out.
So, there you have it. The long wait until the 21st, then a solid few days of bigger, more powerful surf through the 22nd and 24th. The 24th is the standout, but it’s a beast. The final weekend is the one for the more moderate crew. Stay safe out there.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Very mild (max 18°C on Tue afternoon, min 11°C on Sun afternoon). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 22mm), heaviest during Wed afternoon. Very mild (max 15°C on Thu morning, min 9°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 16 | SW 15 | SW 15 | WSW 15 | WSW 15 | WSW 13 | WSW 13 | WSW 15 | SW 15 | WSW 14 | WSW 14 | SW 15 | SW 15 | SW 16 |
Wave Graph | |||||||||||||||||||||
529 | 590 | 507 | 854 | 1027 | 868 | 412 | 496 | 284 | 178 | 158 | 142 | 195 | 222 | 372 | 640 | 1621 | 6720 | 2208 | 1915 | 2538 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off |
High Tide | 2:57PM2.16m | 3:05AM2.24m | 3:41PM2.21m | 3:36AM2.16m | 4:22PM2.19m | 4:05AM2.05m | 5:03PM2.12m | 4:33AM1.92m | 5:46PM2.00m | 4:59AM1.78m | 6:35PM1.86m | 5:23AM1.65m | 7:37PM1.74m | ||||||||
Low Tide | 8:59PM0.46m | 9:23AM0.25m | 9:39PM0.54m | 9:56AM0.19m | 10:17PM0.66m | 10:28AM0.19m | 10:54PM0.79m | 11:01AM0.24m | 11:30PM0.95m | 11:34AM0.32m | 00:08AM1.11m | 12:11PM0.44m | 00:56AM1.26m | ||||||||
7:11 | — | — | 7:09 | — | — | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | |
— | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | |
mm | — | — | — | — | — | — | — | — | 3 | 3 | 8 | — | — | — | 2 | — | 6 | 3 | — | — | — |
Temp °C | 13 | 12 | 11 | 14 | 13 | 12 | 17 | 18 | 14 | 14 | 14 | 13 | 15 | 14 | 12 | 15 | 14 | 10 | 11 | 12 | 8 |
Feels °C | 10 | 9 | 9 | 10 | 9 | 10 | 12 | 14 | 10 | 9 | 9 | 8 | 11 | 10 | 10 | 11 | 9 | 3 | 5 | 7 | 4 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 16 | SW 15 | SW 15 | WSW 15 | WSW 15 | WSW 13 | WSW 13 | WSW 15 | SW 15 | SW 14 | SW 16 | SW 15 | SW 15 | SW 16 |
400 | 590 | 507 | 854 | 1027 | 868 | 412 | 496 | 284 | 178 | 158 | 142 | 195 | 222 | 372 | 640 | 846 | 2475 | 2208 | 1915 | 2538 | |
Swell 2 Height (m) Direction Period (s) | SW 14 | SSW 12 | SSW 12 | SSW 11 | S 11 | ESE 6 | ESE 6 | ESE 6 | E 5 | NW 4 | WNW 6 | SW 18 | SW 17 | SW 16 | SW 22 | SW 19 | SW 18 | SW 16 | — | — | — |
529 | 313 | 145 | 93 | 58 | 74 | 34 | 40 | 17 | 1 | 4 | 87 | 188 | 130 | 18 | 303 | 460 | 1158 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | SE 5 | ESE 5 | — | SSW 10 | SW 18 | S 9 | — | — | NW 5 | ENE 5 | E 6 | E 8 | E 6 | — | — | — | — | — | — |
— | — | 6 | 13 | — | 18 | 255 | 6 | — | — | 1 | 3 | 3 | 4 | 1 | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | ESE 5 | E 5 | ESE 5 | — | E 6 | E 5 | ENE 4 | E 5 | NE 6 | NW 2 | NW 2 | — | — | — | WSW 14 | WSW 14 | — | — | — |
— | — | 13 | 23 | 13 | — | 48 | 41 | 18 | 17 | 32 | 1 | 1 | — | — | — | 1621 | 6720 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 101 | 18 | 18 | 56 | 18 | 18 | 18 | 18 | 41 | 41 | 21 | 0 | 0 | 0 | 21 | 21 | 59 | 59 | 0 | 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.











