
Surf Forecasts:
Waimea Rivermouth surf forecast from 7 Aug 2026:
- Best quality surf: Wednesday 12 Aug, 8PM (local time) - 3.5ft (1.0m), 18s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 13 Aug, 5AM (local time) - 4.5ft (1.4m), 16s period, S swell with 1,017 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 8AM (local time) - 1.5ft (0.4m), 14s period with SW 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 Friday (Aug 07) at 8AM. The primary swell is predicted to be 0.4m and 14s period. 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 1.4m 16s and forecast to arrive on Thursday (Aug 13) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Aug 12) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Fri 7th Aug) | 1.5ft (0.4m) 14s |
| Best Surf | 8PM (Wed 12th Aug) | 3.5ft (1.0m) 18s |
| Most Powerful | 5AM (Thu 13th Aug) | 4.5ft (1.4m) 16s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
The Lowdown
Alright folks, Rusty here again, lookin' at the charts and I gotta tell ya, it's a bit of a waiting game out there. Water's at 80.6°, right where we expect it to be for this time of year, so that's not a factor.
The surf for the next few days ain't much to write home about. Starting Friday the 7th, we're looking at thigh-slappers, maybe 1.3 to 1.6 feet at the outside. The energy's weak (52), and it's just not doing much. Saturday the 8th is a bit better, with some ankle-to-knee-high waves in the 1.6-foot range, and a nice cross-off wind keeping things tidy. Sunday and Monday will have a little more size, up to 4.6 feet maybe, but it's that crumbly east windswell, so you'll be doing a lot of pumping for not much reward. Tuesday the 11th is more of the same, but the afternoon gets a little crossed up.
Now, the game-changer is Wednesday the 12th. The wind drops, and we get the first pulse of a proper south groundswell. The period is a long 18 seconds, and while the swell is still only 2.6 to 3.3 feet, there's some serious energy behind it (700). It's glassy and clean – a good sign of things to come.
But the main event, the real standout of this whole forecast, is Thursday the 13th. The swell fills in to a solid 4.3 feet, with a 16-second period from the south, and the energy is pumping at 1090. The wind is a gentle cross-off, and the waves are going to have some real power behind them. This is the one for the experienced crew. Waimea Rivermouth will be doing its thing, holding those long-period lines nicely. This is the day to get wet.
The swell backs off a bit after that, but Friday the 14th and Saturday morning the 15th still offer up some clean, rideable sets in the 3.3 to 3.9-foot range. The period stays respectable, so you'll get some push. Saturday afternoon gets a bit breezy, but it's still surfable.
The start of the next week is a bit of a letdown. We get some windswell and stronger breezes on the 16th and 17th, making it a bit bumpy and less appealing. Then the 18th sees the bottom drop out, and we go into a real slow period for a couple of days. There's a tiny pulse on Friday the 21st that brings some chest-high waves with glassy winds, but it's short period, so it'll be a bit mushy.
So, to sum it up: you want the 13th, maybe the morning of the 12th. That's your cleanest, biggest, most powerful window. The rest has its moments, but it's all about picking the right session. And expect some company at the rivermouth, especially on the good days – it tends to get a little crowded when the waves are worth it.
Short Range ForecastMostly dry. Warm (max 27°C on Fri morning, min 24°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Mon morning, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | |||||||||||||||
AM | PM | 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) | SW 14 | SSW 16 | SW 19 | SW 18 | E 6 | E 7 | E 7 | E 7 | E 7 | E 7 | E 8 | SSW 15 | E 7 | E 6 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 |
Wave Graph | |||||||||||||||||||||
52 | 137 | 95 | 115 | 143 | 198 | 210 | 173 | 198 | 212 | 323 | 234 | 206 | 270 | 268 | 413 | 613 | 890 | 868 | 666 | 623 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 12:30PM0.55m | 1:25PM0.60m | 00:14AM0.17m | 2:12PM0.64m | 1:28AM0.19m | 2:54PM0.66m | 2:24AM0.23m | 3:33PM0.65m | 3:14AM0.27m | 4:09PM0.63m | 4:03AM0.30m | 4:42PM0.59m | 4:51AM0.34m | ||||||||
Low Tide | 5:16AM-0.00m | 9:29PM0.16m | 6:22AM-0.03m | 9:47PM0.13m | 7:19AM-0.05m | 10:10PM0.12m | 8:11AM-0.06m | 10:35PM0.11m | 8:59AM-0.04m | 10:59PM0.10m | 9:46AM-0.01m | 11:24PM0.09m | |||||||||
6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | |
— | 7:15 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:10 | — | — | 7:10 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 28 | 28 | 26 |
Feels °C | 30 | 29 | 27 | 27 | 28 | 28 | 29 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 28 | 28 | 28 | 26 | 29 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SSW 16 | SSW 14 | SSW 14 | SE 6 | SSW 13 | NE 6 | NE 6 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | ESE 7 | SSW 13 | SSW 13 | S 18 | S 16 | S 16 | S 15 | S 15 |
52 | 137 | 77 | 115 | 19 | 99 | 15 | 20 | 198 | 196 | 234 | 234 | 167 | 54 | 239 | 273 | 613 | 890 | 868 | 666 | 623 | |
Swell 2 Height (m) Direction Period (s) | NE 7 | SSE 11 | SW 19 | SE 6 | SW 13 | NE 6 | SSW 13 | SSW 12 | NE 6 | NE 6 | NE 6 | SE 9 | SE 9 | SSW 14 | S 20 | S 18 | SSW 13 | SE 8 | E 8 | SE 8 | NE 6 |
14 | 46 | 95 | 11 | 44 | 18 | 98 | 59 | 18 | 15 | 15 | 39 | 50 | 210 | 268 | 413 | 218 | 34 | 33 | 30 | 17 | |
Swell 3 Height (m) Direction Period (s) | NNW 7 | N 7 | NE 9 | SW 18 | SW 18 | SE 7 | SE 6 | S 18 | SSW 12 | SSW 12 | SSW 11 | N 8 | SSW 11 | SSW 11 | SE 8 | ESE 6 | ESE 6 | NNE 6 | NW 12 | NNE 5 | SE 8 |
9 | 15 | 12 | 83 | 81 | 19 | 9 | 156 | 48 | 47 | 43 | 29 | 42 | 41 | 55 | 14 | 32 | 15 | 36 | 11 | 31 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | E 5 | E 5 | E 6 | E 6 | E 7 | E 7 | E 7 | E 7 | E 7 | E 8 | E 6 | E 7 | E 6 | E 6 | E 6 | E 6 | E 6 | E 7 | E 6 | E 7 |
57 | 34 | 57 | 89 | 143 | 198 | 210 | 173 | 179 | 212 | 323 | 146 | 206 | 270 | 128 | 134 | 207 | 116 | 189 | 194 | 247 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 3 | 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











