Rivermouth_Wailuku Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s have a look at what’s cookin’ for the Rivermouth_Wailuku stretch over the next couple of weeks. I’ll be straight with you – this is a tough one.

First thing you gotta know: the water’s sittin’ at about 80°F right now, which is bang on average for this time of year. Nothing weird goin’ on there.

The overall pattern is a long, drawn-out stretch of onshore wind and messy conditions. We’re lookin’ at a solid 12-day gap with no real surf on offer from the start of the period. From Tuesday the 11th of August right through to the morning of Saturday the 16th, it’s a write-off – cross-onshore winds, short-period windswell, and a whole lot of chop. The waves are there, but they’re ugly. The combined energy is weak to moderate early on (192 on the 11th), then builds into a strong pulse (2109 on the 15th), but the wind just ruins it. That 10ft swell on Saturday afternoon the 15th is big, but with a strong cross-onshore breeze at 25 mph and a messy sea state, it’s a real washing machine. Not worth paddlin’ out unless you’re a kite surfer lookin’ for a tow.

Now, hold on. Late afternoon on Sunday the 16th of August, things finally flip. We get a clean window with a gentle cross-offshore breeze, 12ft swell from the ENE, and a period of 10 seconds. The combined energy is a solid 2452 – that’s strong wave energy. The surf report calls it “excellent surf conditions for experienced surfers.” This is a standout session, but it’s a short window. That size is serious – 12ft is only for the crew with some chops. The 10-second period means it’ll have some punch, but it won’t be too drawn out. Still, the wind is clean, and the Rivermouth_Wailuku reef can handle that direction. Pay attention to the crowd situation, though – this spot is often busy, so expect company.

After that one golden moment, it’s back to the grind. Monday morning the 17th through to the end of the forecast on the 26th, it’s all moderate cross-onshore winds again, with swell hovering between 3ft and 5ft, short periods (6 to 8 seconds), and weak to moderate energy (mostly under 400). The surf is consistently rated as poor. Wednesday the 26th still looks the same – no real change.

So, the bottom line: this forecast is a bummer for the most part. The only real shot you’ve got is that Sunday afternoon (16th August) window. If you’re an experienced surfer and you can get out there, it’ll be worth it. For everyone else, it’s a long wait for not much.

Rusty.

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