Marengo Surf Forecast and Surf Report

G’day, Rusty here.

We’ve got a long window of swell at Marengo, running from today through to the end of the month, but it’s mostly for experienced crew. The standout day for the whole run is Tuesday 15th September morning, with a solid 15ft SW swell pushing in and combined energy readings up at 9788—that’s serious power, and it’s clean under a cross-off breeze. That’s not for the faint-hearted.

Let’s start with the early stuff. Today, Thursday 10th September afternoon, sees a 10ft SW swell at 16 seconds, but at 9 mph cross-off wind it’s just marginal—spot’s got some energy (3842), but not the best. Friday 11th September morning dials it back a bit: 8ft SW, 15-second period, with an almost still 3 mph cross-off breeze. The water temp is 57° and the anomaly is 0.9°, so pretty normal for the time of year. That morning is clean and good for experienced surfers.

Saturday 12th September afternoon is a glassy moment—6ft SW, 15-second swell, and glassy wind out of the ESE at 3 mph. That’s a real treat, clean and lined up, still for experienced folk only. Sunday 13th September gets hammered by 19 mph NNW cross-off wind in the morning, dropping the swell to 4ft and energy to 811—chop city, not worth it.

Monday 14th September morning brings a nice offshore from the WNW at 16 mph, 7ft WSW swell with 13-second period and energy at 2077. That’s clean and solid, again for experienced paddlers. The afternoon drops to a short 8-second period and only a 2/5 score internally, so forget it.

Now Tuesday 15th September morning is the big one: 15ft SW swell, 14-second period, cross-off wind, and combined energy of 9788. That’s a heavy, powerful groundswell—only for experts. The period’s long, so at a reef-and-point setup like Marengo, it’ll hold shape but be intense. If it’s too much, Wednesday 16th September morning has 8ft SW at 16 seconds, cross-off wind, energy 3619, and clean conditions—a better bet for strong surfers.

Thursday 17th September morning is another standout: 6ft SW, 15-second period, offshore wind from the W at 6 mph, energy 1462, and clean. That’s a good, manageable size for experienced intermediates, with clean faces. Friday 18th September afternoon sees a bump back to 10ft SW, 13-second period, cross-off wind, energy 4962—again, expert only.

The second week calms down. Saturday 19th September morning has 5ft SSW swell, 11-second period, offshore wind, energy 775—clean and still surfable for those who know what they’re doing. From Sunday 20th September onward, it drops to small stuff: 2ft on Sunday morning, then 2ft Sunday afternoon with a 16-second period and an offshore breeze—clean but tiny. Monday 21st September is glassy with 4ft SW at 15 seconds, energy around 500-600, but very weak.

The run kind of fizzles after that, with nothing over 6ft until the very end. Wednesday 23rd and Thursday 24th September have 4ft to 6ft SW swells, with some clean offshore windows, but energy stays moderate. By Friday 25th September, a 12ft S swell rolls in with 10-second period and energy up to 5854 in the afternoon—that’s a big, short-period pulse, messy under cross-off wind. Might be more interesting for kiting than paddling at a beachier setup, but Marengo is reef and point, so hold.

Overall, the best bet for experienced surfers is Tuesday 15th September morning for size and power, with Thursday 17th September morning as a cleaner, slightly smaller alternative. Beginners won’t find much love here—most waves are over 5ft and often over 8ft.

Rusty.

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