Waimea Rivermouth Surf Forecast and Surf Report

Alright, Rusty here. Let’s talk about what’s on the menu at Waimea Rivermouth over the next couple of weeks.

Right off the bat, we’ve got a nice little run of clean, cross-offshore conditions kicking off the weekend. Saturday morning, the 29th, sees a small 2.3ft swell from the south, with a 13-second period pushing moderate energy (322). It’s not huge, but the sideshore breeze is keeping things tidy. The water temp is about average for this time of year, nothing wild. That afternoon, the swell jumps to 5.9ft from the east, but the period drops to 6 seconds, so it’s a bit junky – more energy (407), but less push.

Sunday the 30th is the pick of the first few days. Morning glassy conditions, 5.2ft east swell with a 7-second period, but the energy is ramping up (521) and the wind is light and cross-off all day. Expect clean, fun waves for a beginner-friendly spot. This break is fairly consistent, so you won’t be waiting long.

Monday the 31st morning holds similar 5.2ft east swell, light breeze, clean. But by Monday afternoon, the swell drops to 1.6ft from the south, and the energy falls off hard (172) – you’ll be scratching for anything.

Tuesday the 1st into Wednesday the 2nd brings a shift. We’ve got a longer-period south swell (18 seconds) rolling in, but it’s small – 2.3ft to 2.6ft. The energy is building (366 to 568), and the wind stays light. There’s a window Tuesday afternoon with offshore winds, and Wednesday afternoon sees a little rain but still very good surf. The long period means the sets will be a bit more drawn out, but that’s fine for a river mouth setup.

Thursday the 3rd through Friday the 4th keeps the south swell around 2.6ft. Friday morning is a standout: glassy, 13-second period, 219 energy – small but perfect for a longboard session. Saturday the 5th is the real gem here. Morning glass, 3.6ft east swell, 12-second period, and energy jumping to 626. That afternoon holds 3.9ft, still glassy, energy 572. This is the best weekend coming up – clean, consistent, and the swell is starting to have some push.

Now, the second week gets interesting. Sunday the 7th afternoon, a long-period SSW swell (18 seconds) arrives with 3ft and huge energy (1064). That’s a serious groundswell – sets will be fat and powerful, but the long period can make it a bit weird at a beach break. For the river mouth, it’s a good thing. Wind is light and clean.

Tuesday the 8th is the big dog. Morning glassy conditions, 7.2ft from the east, 9-second period, and energy at 1256. That afternoon holds 7.5ft, still clean. This is expert territory – too big for beginners, but for the crew who know what they’re doing, it’s excellent. Wind is light, waves are stacking.

Wednesday the 9th drops back to 5.6ft, still glassy in the morning, but the period is short (8 seconds), so it’s a bit weaker. That afternoon the cross-shore picks up and it gets a little messy.

Thursday the 10th is a write-off for paddle surfing – onshore wind, small weak swell. Could be a kite day.

But hold on – Friday the 11th and Saturday the 12th are another standout. A west swell arrives, 18-second period, 3.9ft to 4.3ft, and the energy is massive (1295 to 1475). Glassy conditions both mornings. This is a long-period groundswell, best for the point or reef setups, but at the river mouth it’ll still handle well. Expect powerful, clean waves for experienced surfers. The energy is off the charts.

Sunday the 13th fades fast – 3.3ft east swell, 7-second period, energy drops to 165. Back to small, clean but weak.

All in all, the first week is a slow builder with some small, clean days, but the real fireworks are the 8th and the 11th-12th of September. Mark those for the best waves.

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