Rivermouth_Wailuku Surf Forecast and Surf Report

G’day, Rusty here. Look, I’ll be straight with you – this 16-day run for Rivermouth_Wailuku is a tough one. The whole stretch is a bit of a grind, with a lot of poor surf conditions and cross-onshore winds that just won’t let up. The water temp is sitting at 80°F, which is about average for this time of year, so that’s one thing we don’t have to worry about.

The first real chance of anything even worth paddling out for doesn’t show up until Monday, July 27th. That’s a solid week of waiting. From the 20th through to the 26th, it’s all poor surf with that constant ENE to NE cross-onshore wind messing things up. The swell is small, mostly around 3ft to 6ft, with short periods of 7 to 8 seconds – just windswell, no power behind it. The combined energy is weak to moderate (177 to 949), but it doesn’t matter because the wind is ruining any chance of a clean face.

Then on Monday, July 27th, the wind finally shifts to an onshore direction, but it’s not offshore – it’s just “on.” The swell starts to pick up a bit, with a 6ft to 6ft swell from the east, and the period jumps to 14 seconds, which is proper groundswell. The combined energy rockets up to 1521 to 1688, so there’s plenty of juice in the water. But the guidance says it’s marginal – questionable tide conditions. This is a reef break, so that long period east swell will wrap in nicely, but those tide issues could make it a bit of a puzzle. The wind is light from the NE at 9 mph, so it’s not perfect, but it’s a big step up from the mess of the first week.

The standout window is Wednesday, July 29th. That morning, the swell is 7ft from the ENE with a 12-second period, and the wind is a light NNE breeze at just 3 mph – that’s as close to glassy as you’ll get. The combined energy is a strong 1364. This is the best on offer. It’s a solid size, too big for beginners at over 5ft, but for experienced surfers, that reef setup should handle the long-period swell well. The only caveat is that this break is fairly consistent, but crowds are often here, so don’t expect to have it to yourself.

After that, the quality drops off again. From Thursday, July 30th, it’s back to cross-onshore winds and poor surf conditions, with the swell dropping and the period shortening. The second week looks like a write-off – consistent ENE winds and choppy, weak surf. If you’re keen, aim for that Wednesday the 29th and get it while it’s clean.

Rusty.

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