Rivermouth_Wailuku Surf Forecast and Surf Report

Hey, Rusty here. Let’s break it down.

This full 16-day stretch at Rivermouth Wailuku is a tough one. There’s a persistent cross-onshore wind that just won’t let up, and the swell direction – every day coming from the east or east-northeast – is not what this reef break prefers, which is a northerly-northeast. The combined energy does spike big time in the middle of the run, but it’s always paired with strong winds and rain that trash the surface.

The single best window comes on Sunday afternoon, 16th August. The swell holds at 10ft from the east, with a short 8-second period – so it’s not a classic groundswell, but the wind finally shifts to a cross-offshore from the southeast at only 9 mph. That cleans the surface right up, and with a combined energy of 1960, there’s real power. It’s the only session in the whole forecast where it won’t be a choppy mess, and while the short period means dumpier takeoffs, it’s the clear highlight.

Before that, Saturday 15th August brings the biggest swell – 10ft to 12ft from the east and east-northeast, with periods up to 11 and 12 seconds – but the wind is howling cross-onshore at 22 to 25 mph with rain showers. The combined energy blasts up to 2218 and even 3122, but it’s so messy and windy it’s borderline unsurfable. That kind of power with that wind angle is more of a kite-surfing setup.

From Monday 17th August all the way to the 27th, it’s a long grind. Swell drops to small stuff – 3ft to 6ft – periods are short, mostly 6 to 8 seconds, and the combined energy stays weak to moderate, maxing out around 308. The wind stays cross-onshore from the east-northeast or east, keeping it choppy. Water temp is 80°, about normal for the season.

So if you’re itching for a paddle, Sunday afternoon, 16th August, is your one real chance at Rivermouth Wailuku. The rest of the run is a long stretch of poor conditions, with the wind and swell direction just not lining up. That’s how it goes sometimes.

Rusty.

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