Surf Forecasts:
Waimea Rivermouth surf forecast from 21 Jul 2026:
- Best quality surf: Saturday 25 Jul, 5AM (local time) - 2.5ft (0.8m), 20s period, SSW swell with cross-offshore winds.
- Most powerful swell: Saturday 25 Jul, 5PM (local time) - 3ft (0.9m), 19s period, SSW swell with 583 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 5PM (local time) - 1.5ft (0.5m), 16s period with S 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 20) at 5PM. The primary swell is predicted to be 0.5m 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 19s and forecast to arrive on Saturday (Jul 25) 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 1.8m 7s period and expected on Saturday (Jul 25) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Mon 20th Jul) | 1.5ft (0.5m) 16s |
| Best Surf | 5AM (Sat 25th Jul) | 2.5ft (0.8m) 20s |
| Most Powerful | 5PM (Sat 25th Jul) | 3ft (0.9m) 19s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
The Lowdown
Alright, I’m looking at the Rivermouth over the next 16 days. The water’s sitting around 80°, which is normal for the season, so no drama there.
The first real window is Monday, July 20th. There’s a small 4ft east swell with a short 8-second period in the morning. The energy is weak at 347, but it’s clean with a light cross-off breeze. The afternoon drops to 2ft, so the morning is your best bet.
Tuesday and Wednesday, the 21st and 22nd, the swell stays small, 2ft to 3ft, but it’s from the south with a longer period of 14 to 15 seconds. That’s groundswell, so it has more shape, but at a beach break, long period swells can be a bit tricky. The energy builds from 264 to 660, but the wind picks up to a moderate breeze on Wednesday, so it’s not as clean.
Thursday the 23rd is the first real highlight. The swell is 2ft from the SSW with a 20-second period, which is very long-period groundswell. The energy is strong at 919. The wind is a gentle breeze from the ENE, keeping it clean. The waves will have push and shape, but be ready for gaps between sets.
Friday the 24th holds that quality, with energy in the 600 to 800 range. But the standout is Saturday, July 25th. The morning brings 3ft from the SSW at 19 seconds, with a light breeze. The combined energy hits 1002, the strongest of the whole run. The water is glassy, and the waves are consistent. This is the day to circle.
The following week has some glassy mornings, like Monday the 27th and Tuesday the 28th, but the swell is tiny, around 2ft or less. You’ll be paddling for little ripples.
There’s a small bump on Saturday, August 1st, with 4ft from the east, but it’s a short-period windswell at 8 seconds. The energy is moderate at 309. It’s clean, but not the same quality as the groundswell.
After that, the 2nd of August gets messy with a cross-chop, and the run fades out into weak surf by the 4th, with energy dropping to 89.
The best call of the whole 16 days is Saturday, July 25th, in the morning. Waimea Rivermouth has that clean 3ft SSW groundswell, light breeze, and the highest energy. It’s not huge, but it’s quality. Crowds are possible, so get there early.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Wed morning. Warm (max 27°C on Mon afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Fri morning. Warm (max 27°C on Thu afternoon, min 23°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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) | S 16 | E 7 | S 15 | S 14 | S 13 | S 14 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | E 7 | E 7 | SSW 17 | E 7 | SSW 19 | SSW 19 | SSW 18 | SSW 16 | SSW 16 | SSW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 134 | 155 | 215 | 257 | 268 | 315 | 429 | 366 | 416 | 399 | 344 | 302 | 340 | 343 | 502 | 583 | 516 | 448 | 427 | 333 |
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 |
High Tide | 7:41PM0.31m | 11:09AM0.41m | 12:17PM0.45m | 1:09PM0.49m | 1:51PM0.52m | 00:27AM0.16m | 2:27PM0.53m | 1:30AM0.16m | 3:01PM0.55m | 2:13AM0.17m | ||||||||||
Low Tide | 3:25PM0.28m | 3:13AM0.05m | 3:56AM0.05m | 4:46AM0.04m | 5:39AM0.03m | 10:22PM0.16m | 6:29AM0.02m | 10:26PM0.14m | 7:14AM-0.00m | 10:38PM0.13m | ||||||||||
 |  |  | | |  | | | | | | | | | | | | | |  | |
 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:21 | — |
mm | — | — | — | — | — | 2 | 1 | — | — | — | — | 1 | — | — | 2 | — | — | — | — | — |
Temp °C | 27 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 28 | 26 | 27 | 29 | 26 | 26 | 26 | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | NNE 7 | NNE 7 | S 15 | S 14 | S 13 | S 14 | S 13 | S 13 | SSE 13 | SSE 13 | SSW 18 | SSE 12 | SSE 12 | NNE 8 | NE 8 | SSW 19 | NNE 8 | SSW 16 | SSW 16 | SSW 16 |
| kJ | 44 | 31 | 215 | 257 | 268 | 315 | 215 | 160 | 235 | 229 | 344 | 202 | 195 | 72 | 93 | 583 | 114 | 448 | 427 | 333 |
Swell 2 Height (m) Direction Period (s) | S 16 | S 15 | NE 7 | NNE 7 | NE 7 | ENE 7 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | NE 7 | NE 7 | SSW 17 | SSW 16 | SSW 19 | NNE 8 | SSW 18 | NE 8 | NE 8 | NE 8 |
| kJ | 134 | 116 | 22 | 30 | 35 | 30 | 429 | 366 | 416 | 399 | 35 | 51 | 340 | 208 | 502 | 86 | 516 | 93 | 95 | 86 |
Swell 3 Height (m) Direction Period (s) | SSW 10 | SSW 11 | SW 11 | SE 6 | SSW 26 | S 24 | NE 7 | NE 6 | NE 7 | NE 7 | SE 7 | SSW 18 | NE 7 | S 20 | SSW 16 | SSE 11 | S 11 | S 11 | S 11 | SSE 10 |
| kJ | 37 | 38 | 30 | 5 | 224 | 284 | 23 | 27 | 35 | 27 | 34 | 246 | 50 | 305 | 144 | 100 | 37 | 37 | 57 | 33 |
Wind waves Height (m) Direction Period (s) | ENE 5 | E 7 | E 7 | E 7 | E 6 | E 6 | E 6 | E 6 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 8 | E 8 | E 8 | ENE 8 | ENE 8 | E 7 |
| kJ | 94 | 155 | 117 | 152 | 132 | 160 | 175 | 115 | 321 | 232 | 312 | 302 | 287 | 343 | 291 | 279 | 300 | 215 | 232 | 150 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 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.
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