Waimea Rivermouth Surf Forecast and Surf Report

Alright folks, Rusty here. Let’s get into it. We’ve got a solid run of surf on the way at Waimea Rivermouth, starting this Monday morning and stretching through the first week of September. The early part of the week looks fun and clean, with a bit of a build-up later on that brings some serious juice, though it gets a little chaotic. The second week tails off into smaller, less exciting conditions, so the real action is in the first seven days.

Monday, 31 August: We kick off with a clean 5.6 ft easterly swell pushing in at 7 seconds. The wind is a cross-off from the ENE at 15 km/h, keeping the faces tidy. The combined energy here is moderate (447). It’s a good, solid start to the week. Monday afternoon holds similar with 4.9 ft, just as clean.

Tuesday, 1 September: This is where it gets really good. Morning brings a very clean 4.6 ft easterly swell, 8-second period, and the cross-off wind drops to a light 10 km/h. The energy bumps up to 524 (moderate). The afternoon switches things up with a 2.3 ft, 18-second south-southwest groundswell – that super long period will give it some real punch at the rivermouth, making for some nice, lined-up waves despite the smaller size. Energy is still moderate at 379.

Wednesday, 2 September: The morning is glassy. Dead calm wind, 3.0 ft southerly swell with a 16-second period. That’s a dreamy combo for a river mouth, creating long, peeling walls. The energy is moderate (427). The afternoon stays clean with 2.6 ft and 16-second swell, but the wind picks up to a cross-off.

Thursday, 3 September: We get a bigger pulse. Morning sees 5.6 ft easterly at 8 seconds, with rain showers but still a cross-off wind. The energy jumps to 778 (moderate-strong). This is a solid, fun size. The afternoon goes to 5.9 ft, 8 seconds, but the wind gets a bit stronger (20 km/h) and the forecast flags some tide concerns. It’s still clean, but the window might be tighter.

Friday, 4 September: The swell holds at 5.9 ft to 6.6 ft, all easterly at 8 seconds. The wind stays a moderate 20 km/h cross-off, but the tide warnings persist. The energy is strong, hitting 814 on the afternoon. It’s surfable, but pick your session carefully.

Saturday, 5 September: This one’s a split day. The morning is 4.3 ft south-southeast swell at 11 seconds with a risk of thunderstorms, and the energy is moderate (496). Not the best. But the afternoon... that’s when it gets big. An 8.2 ft easterly swell at 8 seconds rolls in, with energy hitting a whopping 1294 (strong). That’s serious heft. However, the wind is 25 km/h cross-off and there’s a risk of t-storms. This is expert territory – the size and energy will be a handful, especially at a river mouth.

Sunday, 6 September: The big swell continues. 6.6 ft to 6.9 ft easterly swell, but the period stretches to 13 seconds, mixing in some long-period groundswell. The energy is massive – 2109 (very strong). The wind is cross or cross-off from the east-southeast, creating a cross-chop on the afternoon. This is powerful, raw, and only for the experienced. The long period will make the sets at the rivermouth stand up nicely, but the chop will be a challenge.

Monday, 7 September: The standout. This is the best of the entire forecast. The afternoon sees a 7.2 ft easterly swell at 12 seconds, with a gentle offshore wind from the NE at 15 km/h. The wind is offshore, the faces are clean, and the energy is 2049 (very strong). This is excellent, powerful surf for experienced surfers. The rivermouth will be working perfectly. This is the one to circle.

Tuesday, 8 September: The surf drops back. The morning is a clean 3.0 ft, 15-second south-southwest groundswell with a light cross-off. The afternoon has a light offshore from the north with 3.0 ft, 15-second swell. Pleasant but small.

Wednesday, 9 September: Poor conditions. The wind swings onshore from the south, blowing at 20 km/h,

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