Waimea Rivermouth Surf Forecast and Surf Report

Alright, this is Rusty. Let’s take a look at what’s cookin’ for Waimea Rivermouth.

We’ve got a decent run coming up, but it’s not gonna fire straight away. The first good session to really get your eyes on is Sunday the 25th of August through the following week. The swell kicks up a notch from Monday the 26th of August right into the start of September. Water temp is sitting at 80°F, which is bang on average for this time of year – no crazy anomalies, just your usual warm bath.

Sunday 23rd & Monday 24th August are steady and clean. Waimea Rivermouth is seeing 5 ft of easterly swell with a short 7-second period (moderate wave energy around 349). Winds are a cross-off from the ENE, so the surface is looking clean. It’s a beginner-friendly spot, fairly consistent, but crowds are *sometimes* an issue here – so get in early.

*The real standout hits on Tuesday afternoon, 25th August*. The swell bumps to 6 ft from the east, still a short period (7 seconds), but the combined energy jumps to 516 (moderate energy) and we’ve got light cross-off winds. This is clean, punchy, and a proper fun session for any level that can handle a bit of size.

Wednesday 26th August brings a shift. Morning holds 6 ft east swell, but by the afternoon, a new long-period S groundswell rolls in – 2 ft at 18 seconds. That’s a *very long period*. This will be better shaped, more energy in the water, but at a river-mouth setup, that long period can make it break a bit straight. The energy rating is 756, so it’s moderate to strong. Winds are light and cross-off – perfect conditions.

From Thursday 27th through Friday 28th August, that south groundswell hangs around 3 ft to 3 ft at 15–17 seconds, with light cross-off winds. Clean lines, but smaller. Good for a longboard or a fun mid-length.

Saturday 29th & Sunday 30th August sees the east swell return: 5 ft to 6 ft, short period (6–7 seconds), and moderate energy (380–430). Winds stay favorable. Not a standout, but solid, consistent surf.

A real gem pops up on Tuesday 1st September: a long-period SSW groundswell at 3 ft and 18 seconds, with light cross-off winds. The combined energy is 862 – that’s moderate to strong energy for the size. This is the best-looking, cleanest, most powerful option in the second week. Expect longer waits between sets, but the waves will have real push. Wednesday 2nd September is also excellent – morning has that same SSW energy (852) and the afternoon switches to 6 ft east at 8 seconds. That afternoon session will be more consistent and still clean.

Things wind down after Thursday 5th September – the swell drops to tiny 2 ft S swell with weak energy (119–123). Very ordinary.

Overall, the best on offer is Tuesday afternoon 25th August for the short-period east swell combo, and Tuesday 1st September for that super clean, long-period SSW groundswell with solid energy. If you want power and clean conditions, that September date is the one to circle.

Rusty.

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