Surf Forecasts:
Waimea Rivermouth surf forecast from 17 Jul 2026:
- Best quality surf: Friday 24 Jul, 2PM (local time) - 2.5ft (0.8m), 18s period, SSW swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 8PM (local time) - 3ft (0.9m), 19s period, SSW swell with 539 kJ wave energy.
- Next surfable swell (1★+): Friday 17 Jul, 2PM (local time) - 2ft (0.6m), 14s period with W 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 (Jul 17) at 2PM. The primary swell is predicted to be 0.6m 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 0.9m 19s and forecast to arrive on Thursday (Jul 23) at 8PM. 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 6s period and expected on Saturday (Jul 18) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Fri 17th Jul) | 2ft (0.6m) 14s |
| Best Surf | 2PM (Fri 24th Jul) | 2.5ft (0.8m) 18s |
| Most Powerful | 8PM (Thu 23rd Jul) | 3ft (0.9m) 19s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s happening at Waimea Rivermouth.
Over the next 16 days, we start small and clean, but the real highlight is a long-period groundswell that shows up mid-period. Water temp is about 80°, pretty normal for this time of year.
Friday July 17th – tiny waves, knee-high at 0.6m, from the west, period 14 seconds. Light cross-off breeze, clean. Combined energy moderate at 257.
Saturday July 18th – morning picks up to 1.4m from the east, but period is short at 6 seconds – a bit crumbly. Afternoon jumps to 1.9m, still short period, energy 468. Light cross-off – clean but not the best shape.
Sunday July 19th – morning 1.4m east swell, 8 seconds. Afternoon goes glassy – combined energy 367. This is a great call for a clean session, especially for beginners.
Monday July 20th – morning has a small 0.5m south swell, period 16 seconds, energy 329. Afternoon picks up to 1.1m east swell, glassy – ideal for a longboard.
Tuesday July 21st – morning glassy with 0.7m, 15-second south swell. Afternoon clean, 0.8m, 14 seconds, energy 429.
Wednesday July 22nd – morning 0.5m, 24-second south swell – very long groundswell. Clean, energy 560. This is a standout. Afternoon 0.6m, 23 seconds, energy 655, still clean.
Thursday July 23rd – 0.7m, 20-second swell, energy 573, clean. Quality continues.
Friday July 24th – afternoon sees 0.8m, 17-second swell, but combined energy hits 1203 – strong. Clean and cross-off. This is excellent for experienced surfers.
Saturday July 25th – 0.8m to 0.9m, 19-20 seconds, energy over 1000. Clean but with a moderate breeze. Still top-tier.
Sunday July 26th – fading, 0.9m, 17 seconds, energy 873, clean.
Monday July 27th – 1.6m east swell, short 8-second period, energy 588. Clean but bumpy from the short period.
From Tuesday July 28th onward, it gets small and ordinary. Energy drops, waves stay below 0.8m, and conditions are glassy but weak. By Wednesday July 29th, it’s marginal. The last days into early August are tiny, with only small pulses of 0.5m to 0.6m.
Best window is Wednesday July 22nd through Saturday July 25th – that’s where the long-period groundswell and clean winds line up. For pure quality, aim for that block. The biggest size day is Saturday July 18th, but it’s short-period and less clean.
That’s the story from Waimea Rivermouth.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Fri morning, min 23°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue afternoon, min 23°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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) | W 14 | SSW 16 | SSW 14 | SSW 14 | E 6 | E 8 | E 8 | E 8 | E 7 | S 16 | E 8 | S 15 | S 15 | S 14 | S 13 | S 24 | SSW 23 | SSW 22 | SSW 20 | SSW 20 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 142 | 196 | 198 | 157 | 293 | 249 | 246 | 246 | 147 | 137 | 141 | 165 | 212 | 253 | 256 | 284 | 429 | 366 | 416 | 399 | 377 |
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 | glassy | cross-off | cross-off | glassy | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:26PM0.53m | 7:08AM0.28m | 6:57PM0.45m | 8:22AM0.32m | 7:23PM0.38m | 9:46AM0.36m | 7:41PM0.31m | 11:09AM0.41m | 12:17PM0.45m | 1:09PM0.49m | |||||||||||
Low Tide | 11:23AM0.05m | 1:32AM0.07m | 12:16PM0.13m | 2:04AM0.06m | 1:25PM0.22m | 2:37AM0.06m | 3:25PM0.28m | 3:13AM0.05m | 3:56AM0.05m | 4:46AM0.04m | |||||||||||
 |  |  | | | | | | | | | | | | | | | | | | | |
 | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — |
 | — | 7:23 | — | — | 7:23 | — | — | 7:23 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 25 | 27 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 29 | 29 | 27 | 28 | 28 | 26 | 27 | 26 | 26 | 27 | 28 | 27 | 27 | 28 | 26 | 27 | 27 | 27 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | W 14 | NNE 7 | SSW 14 | SSW 14 | S 14 | SE 8 | S 12 | S 13 | NE 8 | NE 7 | S 16 | S 15 | S 15 | S 14 | S 13 | S 13 | S 13 | S 13 | SSW 20 | SSW 20 | SSW 18 |
| kJ | 142 | 34 | 198 | 149 | 146 | 42 | 78 | 86 | 28 | 26 | 134 | 165 | 212 | 253 | 256 | 276 | 212 | 215 | 416 | 399 | 377 |
Swell 2 Height (m) Direction Period (s) | NNE 7 | SSW 16 | NNE 7 | NNE 7 | SE 6 | NNE 8 | NE 7 | SE 8 | SSW 11 | S 11 | NNE 7 | NE 7 | NE 7 | NNE 7 | NE 7 | ENE 7 | SSW 23 | SSW 22 | S 13 | S 13 | S 11 |
| kJ | 35 | 196 | 33 | 32 | 29 | 36 | 26 | 35 | 40 | 65 | 21 | 23 | 22 | 18 | 23 | 31 | 429 | 366 | 157 | 157 | 56 |
Swell 3 Height (m) Direction Period (s) | SE 7 | W 14 | W 13 | SE 7 | NNE 7 | S 12 | SE 9 | NNE 7 | S 18 | S 16 | S 11 | S 11 | SSW 11 | SW 16 | SSW 26 | S 24 | SE 5 | NE 7 | NE 6 | ESE 6 | S 13 |
| kJ | 26 | 136 | 89 | 19 | 34 | 73 | 46 | 20 | 99 | 137 | 57 | 59 | 40 | 65 | 224 | 284 | 14 | 21 | 14 | 22 | 85 |
Wind waves Height (m) Direction Period (s) | E 6 | E 6 | E 6 | E 6 | E 6 | E 8 | E 8 | E 8 | E 7 | E 8 | E 8 | E 7 | ENE 7 | E 7 | E 7 | E 5 | E 6 | E 6 | E 5 | E 6 | NE 6 |
| kJ | 89 | 125 | 118 | 157 | 293 | 249 | 246 | 246 | 147 | 127 | 141 | 134 | 86 | 111 | 107 | 90 | 178 | 95 | 97 | 207 | 18 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 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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