Rivermouth_Wailuku Surf Forecast and Surf Report

Right, folks, let’s get into it. The window’s lookin’ a bit grim for a while, I won’t lie to ya. The only break on the radar is Rivermouth_Wailuku, and it’s a reef setup that’s fairly consistent. But for the first week and a half, we’re staring down the barrel of a whole lot of nothin’ good. The wind is stubbornly out of the east-northeast, blowin’ cross-on, and the wave comment is “poor surf conditions” right through.

Water temp’s at 79.9°, which is about average for the time of year, so at least the water’s not gonna give you a shock.

We start off on Thursday, 6th August, with tiny waves. Morning swell is a pathetic 2.3ft from the ENE with a short 8-second period, and the combined energy is weak (103). The cross-on breeze makes it a choppy mess. It’s the same story for days: Thursday afternoon brings 3.6ft, Friday morning drops to 2.0ft, Friday afternoon pops up to 3.3ft but with a 5-second period that’s just noise. Saturday the 8th sees 3.9ft, and it slowly builds, but it’s all cross-on, all choppy. The energy stays moderate (170-218) but the quality is zero.

Sunday the 9th through Wednesday the 13th is a long, flat line of poor surf. Swell hovers between 3.6ft and 5.2ft, period is short (7-8 seconds), and the wind is relentless from the ENE. This is a stretch of days where you’re better off doin’ somethin’ else.

Now, we start to see a pulse pick up around Friday the 14th of August. The swell jumps to 6.2ft in the morning, then 6.6ft in the afternoon, with the combined energy ramping up to moderate/strong (339-407). But it’s still cross-on from the ENE, so it’s gonna be messy. Saturday the 15th is the biggest day of the whole run: 7.5ft-7.9ft from the ENE, period stretching to 9 seconds, and the energy gets strong (741-880). Sunday the 16th holds that size at 7.9ft (909 energy) and 7.5ft (855 energy). Still, all that power is matched with a cross-on wind, so it’s gonna be a washing machine. For a reef like Rivermouth_Wailuku, that’s a real shame. This is expert-only territory, and honestly, it looks more interesting for kite surfing than paddle surfing with that wind and chop.

Monday the 17th sees a slight drop to 6.9ft, still cross-on. The only glimmer comes on Tuesday the 18th of August morning. The swell is still 6.2ft from the ENE with an 8-second period, the energy is strong (522), and the wind finally eases to a gentle breeze from the NE. The comment shifts to “marginal surf forecast.” It’s the best we’ve got in the whole 16 days, but it’s a long shot. The break is a reef, and the swell direction is ENE while the optimum direction is NNE, so it’s not a perfect match. The crowds are “often” at this spot, so you won’t be alone.

After that, it fades back into poor conditions through the end of the window on the 21st of August.

So, the standout, if you can call it that, is that Tuesday the 18th morning session. It’s the only slot with a score of 1 out of 10 instead of a zero. The size is there, the energy is there, but the wind is finally light enough to maybe give you a few clean-ish walls. For the rest? It’s a long, frustrating stretch of cross-on chop. Don’t get your hopes up.

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