Waimea Rivermouth Surf Forecast and Surf Report

Alright folks, this is Rusty, and we’ve got a solid run of surf coming up here at Waimea Rivermouth. The ocean is about to turn on the charm, so let’s get into it.

The first real action kicks off on Tuesday, August 11th. It’s not going to blow your mind, but it’s a clean start. You’ve got a tiny 2ft swell rolling in from the SSW with a very long 15-second period, packing a weak 340 combined energy. The wind is a light cross-off, making for a smooth, clean morning. The afternoon goes glassy with a touch more size at 2ft. It’s a gentle reintroduction to the water.

Wednesday, August 12th, is where things start to get interesting. The swell jumps to 3ft in the morning, still from the S, but the period stretches to 18 seconds – that’s proper groundswell energy. The combined energy climbs to 832 (moderate), and the wind is a light cross-off. By Wednesday afternoon, it’s 4ft with the same 18-second period, and the energy hits 1048 (strong). This is excellent, clean surf for those who know what they’re doing. The Rivermouth will be handling this long-period S swell beautifully.

Thursday, August 13th, is a standout. Morning sees 4ft of S swell, 16-second period, and a massive 1067 combined energy. The wind is light cross-off and the sky is clear. This is top-tier, powerful, clean surf. The afternoon holds size but the period drops a tick. This is the best early window.

We cruise through Friday and Saturday with consistent, clean, cross-off conditions. Swell sizes hover around 3ft to 6ft, with energy dropping back to moderate. Saturday morning, the swell shifts to a short-period 8-second E swell at 6ft – it’s a bit of a different beast, but it’s still clean.

Now, Sunday, August 16th, throws a real gem at us. The morning session brings a 7ft E swell with an 11-second period and a thumping 1211 combined energy (strong). The wind is a light cross-off from the NE. For experienced surfers, this is the pick of the whole forecast – powerful, clean, and pushing hard. That afternoon, it drops off quickly.

Then we hit a nasty patch. From Monday, August 17th, through Wednesday, August 19th, the wind goes berserk. We’re talking 31 mph winds, near gale force, with heavy rain, thunderstorms, and a complete mess. The swell is tiny and the conditions are unsurfable. Total write-off for about three days.

Things start to recover on Thursday, August 20th. The morning is marginal, with a cross-shore ripple, but the afternoon goes glassy. A 5ft E swell rolls in with a short 6-second period and 320 combined energy. It’s not perfect, but it’s clean enough to get a wave.

Friday, August 21st, and Saturday, August 22nd, are back to clean, glassy mornings and afternoons. The swell is small (2ft to 3ft), but the period is long again (16-18 seconds) from the SSW. This is perfect for a longboard or a fun shape. The energy on Saturday afternoon jumps to 761 (moderate), a welcome uptick.

The real late-season highlight hits Sunday, August 23rd. The morning is crystal clear, with a 3ft SSW swell, a 15-second period, and a whopping 1037 combined energy. The wind is light cross-off. This is another excellent window – clean, powerful, and reeling. The afternoon gets a bit bigger with a short-period E swell, but the morning is the money-maker.

We roll into the last week of August with more consistent, clean surf. Monday, August 24th, and Tuesday, August 25th, offer clean conditions with swells from the E and S, ranging from 3ft to 6ft. The energy stays moderate, and the winds are light. Finally, Wednesday, August 26th, caps it off with a killer morning: 4ft of S swell, 16-second period, and a massive 1086 combined energy. Clean, clear, and powerful. A perfect way to end the run.

The biggest standout is Sunday, August 16th morning, with that 7ft E swell and clean conditions. The second standout is Wednesday, August 26th morning, with its long-period S groundswell and high energy. Get on it.

Rusty.

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