Surf Forecasts:
Waimea Rivermouth surf forecast from 6 Jul 2026:
- Best quality surf: Wednesday 8 Jul, 5AM (local time) - 6ft (1.8m), 8s period, E swell with cross-offshore winds.
- Most powerful swell: Monday 6 Jul, 8AM (local time) - 3ft (0.9m), 16s period, SSW swell with 427 kJ wave energy.
- Next surfable swell (1★+): Monday 6 Jul, 8AM (local time) - 3ft (0.9m), 16s period with SSW 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 Monday (Jul 06) at 8AM. The primary swell is predicted to be 0.9m and 16s 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 0.9m 16s and forecast to arrive on Monday (Jul 06) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 7s period and expected on Tuesday (Jul 07) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Mon 6th Jul) | 3ft (0.9m) 16s |
| Best Surf | 5AM (Wed 8th Jul) | 6ft (1.8m) 8s |
| Most Powerful | 8AM (Mon 6th Jul) | 3ft (0.9m) 16s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, Rusty here, breaking it down for you in feet and Fahrenheit.
We’re looking at Waimea Rivermouth – a spot that picks up a fair bit of swell, so even the quieter days have something to offer. Water temp is about 79°, right where it should be for the season.
First few days are a slow roll. Sunday July 5th has small 3ft SSW swell pushing in. Rideable, but with a moderate breeze and moderate energy (518), it’s gutless. Monday the 6th and Tuesday the 7th morning are similar – clean but small, energy fading a bit (426 to 362). You can get wet, but don’t expect much.
Things kick into gear Tuesday afternoon the 7th, though. Swell jumps to about 6ft from the E, short period of 8 seconds. That’s a choppy period for a beach break, but the energy hits 643, and with light ENE winds, it’ll be clean. Wednesday the 8th and Thursday the 9th keep the consistency: 5 to 6ft E swell, same short period, light breezes, and energy in the strong zone (400-616). For a beginner-friendly spot, that’s super fun, clean conditions.
Friday the 10th holds with 5 to 5ft E swell and the lightest winds – 6 mph from the ENE. Silky surface. Then Saturday the 11th is a weird one: a tiny 2ft SW swell in the morning drops to weak energy (173), but the afternoon snaps right back to 6ft E swell with strong energy (599). That afternoon is the session.
The big standout? No question: Friday morning, July 17th. Swell is 6ft from the E, period 8 seconds, energy solid at 530 – but the wind is listed as *glass*. Dead calm, mirror-flat water. That’s a rare, clean window at a rivermouth that can get bumpy. It’s not too big, the quality will be there, and with light offshores, that’s the morning to circle on your calendar.
The rest of the second week keeps pumping – Saturday the 18th through Monday the 20th – with consistent 5 to 6ft E swell and light to gentle breezes, but nothing matches that glassy perfection of the 17th. A few long-period W groundswell pulses on the 14th and 15th (17-16 seconds) are interesting, but that long period tends to make the rivermouth section straighten out. Better for points than this spot.
All in all, a solid run for Waimea Rivermouth. Take it easy early, then get stoked for that glassy Friday.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed afternoon. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Fri afternoon. Warm (max 27°C on Thu afternoon, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sun 12 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | E 7 | E 8 | E 7 | E 7 | E 7 | E 7 | E 7 | S 12 | S 11 | SW 19 | E 8 | SSW 18 | SSW 17 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 350 | 421 | 380 | 284 | 350 | 276 | 358 | 413 | 419 | 290 | 306 | 349 | 233 | 69 | 66 | 96 | 367 | 242 | 202 | 264 | 258 |
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 | cross-off | cross-off |
High Tide | 9:20AM0.28m | 7:49PM0.37m | 10:43AM0.35m | 8:18PM0.31m | 11:53AM0.44m | 8:51PM0.25m | 12:49PM0.52m | 9:52PM0.20m | 1:39PM0.58m | 11:39PM0.17m | 2:26PM0.63m | 1:07AM0.16m | 3:11PM0.67m | ||||||||
Low Tide | 2:49AM0.06m | 1:52PM0.23m | 3:22AM0.04m | 4:16PM0.27m | 4:01AM0.01m | 6:58PM0.26m | 4:47AM-0.02m | 8:54PM0.21m | 5:37AM-0.05m | 9:41PM0.17m | 6:29AM-0.07m | 10:15PM0.14m | 7:21AM-0.10m | ||||||||
 |  | | | |  | | |  | | | | | | |  | | | | | | |
 | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — |
 | 7:25 | — | 7:25 | — | — | 7:25 | — | — | 7:25 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 |
Feels °C | 25 | 25 | 26 | 24 | 25 | 25 | 25 | 27 | 27 | 25 | 26 | 27 | 25 | 28 | 29 | 26 | 27 | 27 | 26 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 15 | NNE 8 | NE 8 | SSW 14 | SSW 14 | NNE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NNE 7 | NE 7 | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NNE 8 |
| kJ | 350 | 421 | 380 | 98 | 110 | 276 | 265 | 70 | 56 | 53 | 53 | 51 | 47 | 54 | 70 | 79 | 70 | 62 | 91 | 128 | 130 |
Swell 2 Height (m) Direction Period (s) | NNE 7 | NE 7 | NE 8 | SSW 15 | SSW 14 | NNE 8 | NNE 7 | S 14 | S 13 | S 13 | S 12 | S 12 | S 12 | S 12 | S 11 | SE 8 | SW 18 | SSW 18 | SSW 17 | SW 16 | SW 16 |
| kJ | 68 | 77 | 84 | 284 | 350 | 72 | 34 | 181 | 176 | 125 | 112 | 108 | 75 | 69 | 66 | 24 | 159 | 207 | 202 | 264 | 258 |
Swell 3 Height (m) Direction Period (s) | SE 9 | SE 6 | SE 9 | SE 8 | SE 9 | SE 6 | SE 8 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SE 6 | SW 19 | SE 6 | SE 9 | SE 8 | SE 8 | SE 8 |
| kJ | 31 | 5 | 28 | 25 | 19 | 12 | 24 | 13 | 23 | 13 | 13 | 11 | 14 | 13 | 8 | 96 | 13 | 46 | 25 | 23 | 23 |
Wind waves Height (m) Direction Period (s) | E 7 | E 7 | ENE 8 | ENE 7 | ENE 7 | E 8 | E 7 | E 8 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 8 | ENE 8 | E 8 | E 7 | ENE 7 | E 8 | E 8 |
| kJ | 247 | 240 | 345 | 319 | 414 | 324 | 358 | 413 | 419 | 290 | 306 | 349 | 233 | 251 | 292 | 375 | 367 | 242 | 215 | 193 | 217 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 6 | 3 | 0 | 0 | 3 | 0 | 0 | 6 | 0 | 0 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 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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