Surf Forecasts:
Waimea Rivermouth surf forecast from 30 Aug 2026:
- Best quality surf: Sunday 30 Aug, 8AM (local time) - 5.5ft (1.7m), 7s period, E swell with cross-offshore winds.
- Most powerful swell: Saturday 5 Sep, 5PM (local time) - 7ft (2.2m), 8s period, E swell with 628 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 8AM (local time) - 5.5ft (1.7m), 7s period with E swell.
Best Forecast Surf Conditions for Waimea Rivermouth this week:
The surf forecast for Waimea Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 30) at 8AM. The primary swell is predicted to be 1.7m and 7s period with a secondary swell of 0.6m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Waimea Rivermouth in the next 16 days are 2.2m 8s and forecast to arrive on Saturday (Sep 05) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Tuesday (Sep 01) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 30th Aug) | 5.5ft (1.7m) 7s |
| Best Surf | 8AM (Sun 30th Aug) | 5.5ft (1.7m) 7s |
| Most Powerful | 5PM (Sat 5th Sep) | 7ft (2.2m) 8s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
The Lowdown
Alright, Rusty here, let's have a look what's on the menu for Waimea Rivermouth. The early part of the period is all about short-period east swell, and the standout window really focuses around a few days where the conditions just line up perfectly.
We kick off on Sunday the 30th of August with a clean 6 ft east swell coming in at a short 7 seconds, with a nice cross-off breeze. It's not huge but it's fun, with a combined energy of 557. The water temp is about average for this time of year, so no surprises there. This is a fairly consistent spot, but keep in mind it can get crowded *sometimes*, so get in early. Monday stays similar with the same east swell dropping just a touch, still clean.
Then there's a real shift. Tuesday the 1st of September sees the swell drop right down to 2 ft, but the period jumps to 18 seconds – that's proper groundswell. This long-period energy (366) works well at a rivermouth like this, as it tends to wrap in and offer better shape. Wednesday keeps a similar story with a 16-second south swell, but the energy picks up to 545 on Wednesday afternoon, and despite a few rain showers, the wind stays clean.
Now, the big standout. Tuesday the 8th of September is the one to circle on the calendar. We get a solid 6 ft east swell with an 11-second period and a consistent cross-off wind from the ENE at 9 mph. The combined energy here is huge – 1320 – and the call is "excellent surf conditions for experienced surfers." At 6 ft, it's pushing into that more powerful territory, so it’ll suit those with a bit of time in the water. That's your best bet of the whole run. Wednesday the 9th offers a brief reprieve with glassy conditions and a 2 ft SSW swell at 14 seconds, which'll be a nice, clean change of pace.
The end of the run has a few small windows, like the 11th of September with a glassy morning and 6 ft east swell at 8 seconds – very clean, very user-friendly. But overall, the second week is a bit more mixed, with smaller swells and some less consistent energy. Don't sleep on that Tuesday the 8th, though – that’s the real gem.
Stay stoked,
Rusty
Short Range ForecastSome drizzle, heaviest during Mon afternoon. Warm (max 27°C on Sun morning, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Wed afternoon. Warm (max 27°C on Wed morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | S 19 | S 18 | S 18 | S 17 | S 16 | S 16 | S 15 | S 14 | E 8 | E 8 | S 13 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 312 | 311 | 272 | 187 | 229 | 289 | 273 | 314 | 314 | 377 | 339 | 326 | 279 | 268 | 259 | 221 | 167 | 323 | 412 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 5:15AM0.41m | 5:00PM0.43m | 6:04AM0.44m | 5:21PM0.37m | 7:01AM0.47m | 5:37PM0.31m | 8:09AM0.48m | 5:28PM0.26m | 9:31AM0.50m | 10:56AM0.53m | |||||||||
Low Tide | 11:05PM0.07m | 11:04AM0.14m | 11:29PM0.05m | 11:59AM0.19m | 11:55PM0.05m | 1:12PM0.24m | 00:27AM0.04m | 3:37PM0.27m | 1:08AM0.05m | 2:09AM0.05m | 3:41AM0.06m | ||||||||
 |  |  | | |  | | | | | | |  | | | | | |  | |
 | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — |
 | 6:58 | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | — | 1 | — | — | — | — | — | 1 | 1 | 1 | 1 | — | — | — | — |
Temp °C | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 25 |
Feels °C | 27 | 27 | 28 | 27 | 29 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 28 | 27 | 28 | 27 | 28 | 28 | 26 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | NE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | S 17 | S 16 | S 16 | S 15 | S 14 | S 14 | S 13 | S 13 | NNE 7 | NNE 7 |
| kJ | 53 | 54 | 50 | 41 | 66 | 70 | 70 | 70 | 68 | 377 | 339 | 326 | 279 | 268 | 243 | 176 | 167 | 54 | 59 |
Swell 2 Height (m) Direction Period (s) | S 12 | S 12 | S 12 | S 11 | S 11 | S 11 | SSE 10 | S 18 | S 18 | NNE 7 | N 6 | N 6 | NE 7 | NNE 7 | NE 7 | NE 7 | NNE 6 | S 13 | S 13 |
| kJ | 103 | 100 | 100 | 64 | 58 | 56 | 82 | 314 | 314 | 34 | 30 | 18 | 53 | 35 | 64 | 37 | 22 | 165 | 119 |
Swell 3 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | S 19 | SSE 10 | S 12 | SSE 10 | ENE 8 | NE 8 | S 11 | S 10 | SSE 10 | SSE 10 | SE 13 | SE 6 | SE 12 |
| kJ | 111 | 146 | 97 | 126 | 123 | 116 | 273 | 52 | 73 | 58 | 23 | 15 | 61 | 55 | 33 | 38 | 58 | 11 | 66 |
Wind waves Height (m) Direction Period (s) | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 7 | E 8 | E 8 |
| kJ | 312 | 311 | 272 | 187 | 229 | 289 | 285 | 245 | 257 | 264 | 318 | 219 | 245 | 177 | 259 | 221 | 292 | 323 | 412 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 20 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Kaua'i | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Waimea Rivermouth Surf forecast
The above surf forecast table for Waimea Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Waimea Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Waimea Rivermouth surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Waimea Rivermouth) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Waimea Rivermouth may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Are you planning a vacation in Kaua'i? If you are looking for accommodation near Waimea Rivermouth, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 32 km (20 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 34 km (21 miles) away
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