Surf Forecasts:
Marengo surf forecast from 15 Aug 2026:
- Best quality surf: Saturday 22 Aug, 10AM (local time) - 10ft (3.0m), 15s period, SW swell with offshore winds.
- Most powerful swell: Saturday 22 Aug, 1PM (local time) - 11ft (3.5m), 14s period, SW swell with 4,757 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 4AM (local time) - 3.5ft (1.1m), 9s period with W 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 1.1m and 9s period with a secondary swell of 0.6m and 14s. Another secondary swell of 0.4m and 18s 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 3.5m 14s and forecast to arrive on Saturday (Aug 22) at 1PM. 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) | 3.5ft (1.1m) 9s |
| Best Surf | 10AM (Sat 22nd Aug) | 10ft (3.0m) 15s |
| Most Powerful | 1PM (Sat 22nd Aug) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Marengo over the next 16 days.
The Lowdown
G’day, Rusty here. Look, I’ll be straight with you – the next couple of weeks at Marengo are a bit of a mixed bag, but there’s one session that’s going to get the blood pumping for the crew who know what they’re doing.
We start off quiet. This Sunday the 16th has some small 4ft to 4ft SW swell rolling in with a solid 14-second period, but the onshore wind and questionable tide are making it a pretty average option. The combined energy is sitting around 929, so there’s some juice there, but it’s messy and not worth getting too excited about. That sets the tone for a slow start. Monday through Wednesday next week are pretty much a write-off – the swell drops, the wind turns cross or onshore, and the energy dips into the weak zone (down to around 198), so you’re better off saving your energy.
Thursday the 20th afternoon is where things start to perk up. There’s a 5ft W swell with a 10-second period, and clean conditions thanks to a cross-offshore breeze. Combined energy hits 789, which is moderate, and it’s the first time we see “clean” in the wave comment. It’s a decent option for a casual session, but not a standout.
Then, Saturday the 22nd – that’s the one to circle on the calendar. Both morning and afternoon see a solid 10ft to 12ft SW swell with a 15-second period, and offshore winds out of the WSW to W keeping it clean. The combined energy blows up to 6966 and 7360 – that’s strong to very strong wave energy. This is expert territory with the size over 8ft, so it’s not for the faint-hearted. Marengo’s a reef and point, so the long-period groundswell will really wrap in and offer some proper waves, but it’s only for those with experience. For the big-dog crew, this is the highlight of the whole forecast.
The following Sunday and Monday (23rd and 24th) still have size – 6ft to 12ft – and clean conditions, but the quality drops a notch with cross-offshore wind and some rain. Still worth a paddle if you missed the Saturday action.
By Tuesday the 25th, the wind swings onshore again, turning it choppy and lumpy, and the combined energy drops to 1272. It’s a fast decline into the second week. Wednesday the 26th has some 6ft to 6ft SSW swell and clean conditions, but it’s nothing to write home about. The last real chance comes on Friday the 28th morning – glassy conditions with a 4ft SW swell and 16-second period, combined energy of 677. It’s clean and playful, a mellow session for the weekend warriors.
After that, it fizzles out. The 29th through 31st are small, onshore, and weak – energy down to 239 or less. A bit of a flat spell to close out the month.
So, bottom line: if you’re an expert, lock in Saturday the 22nd for the biggest, cleanest swell of the run. Everyone else, keep an eye on Friday the 28th morning for a glassy, fun-sized wave.
Stay salty,
Rusty
Short Range ForecastMostly dry. Very mild (max 17°C on Tue afternoon, min 11°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Fri afternoon. Very mild (max 15°C on Thu afternoon, min 9°C on Thu night). Mainly fresh winds. | ||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | WSW 15 | SW 15 | SW 17 | W 10 | SW 14 | SW 19 | SW 18 | SW 16 |
Wave Graph | |||||||||||||||||||
1554 | 529 | 590 | 507 | 854 | 1027 | 856 | 412 | 560 | 287 | 176 | 154 | 104 | 152 | 470 | 293 | 1100 | 808 | 3301 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-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 |
High Tide | 2:32AM2.28m | 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 | |||||||
Low Tide | 8:49AM0.36m | 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 | |||||||
— | 7:11 | — | — | 7:09 | — | — | 7:07 | — | — | 7:07 | — | — | 7:05 | — | — | 7:03 | — | — | |
— | — | 5:47 | — | — | 5:49 | — | — | 5:50 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 2 | 5 | 2 | — | — | — | — | 5 | 1 |
Temp °C | 12 | 13 | 13 | 11 | 14 | 13 | 12 | 16 | 17 | 14 | 14 | 13 | 14 | 14 | 15 | 12 | 15 | 15 | 11 |
Feels °C | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 12 | 12 | 11 | 9 | 9 | 11 | 10 | 11 | 9 | 10 | 9 | 3 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SSW 12 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 16 | SW 16 | SW 15 | ENE 6 | SW 15 | WSW 14 | WSW 13 | SW 14 | SW 15 | WSW 14 | SW 16 |
1554 | 400 | 590 | 507 | 854 | 1027 | 856 | 412 | 560 | 287 | 176 | 28 | 104 | 152 | 154 | 293 | 795 | 682 | 1456 | |
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 | ESE 5 | WSW 15 | SW 18 | SW 17 | SW 16 | E 7 | WSW 20 | SW 18 | — |
— | 529 | 313 | 186 | 93 | 58 | 74 | 36 | 34 | 17 | 5 | 154 | 54 | 147 | 165 | 1 | 253 | 614 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | ESE 5 | ESE 5 | — | SSW 10 | SW 18 | S 9 | — | — | — | NE 5 | E 6 | E 6 | E 7 | SW 19 | SW 18 | — |
— | — | — | 3 | 8 | — | 18 | 255 | 6 | — | — | — | 3 | 3 | 1 | 4 | 1100 | 808 | — | |
Wind waves Height (m) Direction Period (s) | — | — | — | ESE 5 | — | ESE 5 | — | E 6 | E 6 | NE 3 | E 5 | NE 5 | NW 3 | — | W 10 | — | — | — | SW 16 |
— | — | — | 9 | — | 12 | — | 52 | 48 | 5 | 17 | 23 | 4 | — | 470 | — | — | — | 3301 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 18 | 101 | 18 | 18 | 20 | 18 | 18 | 18 | 18 | 41 | 21 | 21 | 37 | 0 | 2 | 21 | 21 | 59 |
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.











