Surf Forecasts:
Waimea Rivermouth surf forecast from 3 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 8PM (local time) - 4.5ft (1.3m), 11s period, E swell with cross-offshore winds.
- Most powerful swell: Tuesday 4 Aug, 2PM (local time) - 4.5ft (1.3m), 12s period, E swell with 456 kJ wave energy.
- Next surfable swell (1★+): Monday 3 Aug, 8AM (local time) - 4.5ft (1.4m), 8s 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 Monday (Aug 03) at 8AM. The primary swell is predicted to be 1.4m and 8s 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 1.3m 12s and forecast to arrive on Tuesday (Aug 04) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 5s period and expected on Friday (Aug 07) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Mon 3rd Aug) | 4.5ft (1.4m) 8s |
| Best Surf | 8PM (Tue 4th Aug) | 4.5ft (1.3m) 11s |
| Most Powerful | 2PM (Tue 4th Aug) | 4.5ft (1.3m) 12s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
The Lowdown
Alright, let’s break it down for Waimea Rivermouth.
Monday morning kicks off with 5 ft east swell, 8-second period, combined energy 275 (moderate), and a light cross-off breeze. Water temp is 81°, right on average for the season. That morning surf is alright.
By Monday afternoon, the swell drops to 1 ft, but glassy wind at 5 km/h from the ENE keeps it clean – just real small.
Tuesday morning is glassy again with 3 ft east swell, 8 seconds, energy 187 (moderate). Tuesday afternoon picks up energy to 448 (moderate) with 4 ft east swell at 11 seconds, cross-off wind.
Wednesday through Friday morning is tiny, under 1 ft. Then Friday afternoon brings a 2 ft SSW swell with a 16-second period, energy 149 (moderate), clean cross-off.
Saturday 8th August: 5 ft east swell, 7 seconds, energy 303 (moderate), cross-off. By Saturday afternoon, 5 ft east, energy 319 – still short period. Sunday same story, energy building to 454 by afternoon.
Tuesday 11th August afternoon is a big jump: 7 ft east swell, only 6 seconds, energy 504 (moderate), cross-off. That’s expert territory at that size.
Best on offer: Wednesday 12th August. 3 ft south swell, 18-second period, energy 1014 (strong), light cross-off. That’s a proper groundswell, clean and powerful. Thursday and Friday stay good with south swell of 4 ft to 4 ft, periods 14-16 seconds, energy still high (872 to 823), cross-off wind.
Saturday 15th morning wind picks up to 20 km/h cross-off, but still clean, 4 ft south at 14 seconds, energy 860. Saturday afternoon eases.
Sunday 16th: west swell at 3 ft, 14 seconds, energy 614, wind up again.
Monday 17th and Tuesday 18th: east swell returns at 6 ft to 6 ft, 8 seconds, energy 756 to 663, cross-off. Punchy and powerful.
The window has a slow start but builds into some serious quality mid-second week. Crowds are possible, but worth it for those clean south groundswell days.
Keep an eye on that Wednesday 12th – it’s the gem.
Rusty.
Short Range ForecastSome drizzle, heaviest during Tue afternoon. Warm (max 27°C on Mon afternoon, min 24°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Thu afternoon. Warm (max 27°C on Thu morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | |||||||||||||||
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) | E 8 | SSW 13 | E 8 | E 8 | E 11 | SW 15 | S 13 | SSE 12 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SSW 16 | SSW 14 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 266 | 55 | 161 | 140 | 351 | 59 | 52 | 49 | 57 | 54 | 52 | 53 | 52 | 137 | 77 | 168 | 199 | 205 | 209 | 239 | 233 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:27PM0.39m | 8:40AM0.39m | 6:44PM0.33m | 10:03AM0.44m | 11:24AM0.50m | 12:30PM0.55m | 1:25PM0.60m | 00:14AM0.17m | 2:12PM0.64m | 1:28AM0.19m | |||||||||||
Low Tide | 12:43PM0.21m | 1:30AM0.05m | 2:18PM0.27m | 2:09AM0.04m | 2:59AM0.03m | 4:05AM0.02m | 5:16AM-0.00m | 9:29PM0.16m | 6:22AM-0.03m | 9:47PM0.13m | |||||||||||
 | |  | |  | |  | | | | |  | |  | | | |  | | | | |
 | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:13 | — |
mm | — | — | — | — | 1 | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | 2 | — |
Temp °C | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 |
Feels °C | 28 | 29 | 27 | 28 | 28 | 27 | 29 | 28 | 28 | 30 | 29 | 27 | 29 | 29 | 27 | 28 | 28 | 26 | 29 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | NNE 6 | N 6 | NNE 6 | SSW 12 | SSW 12 | SSW 11 | NE 10 | NE 10 | SSW 10 | S 11 | N 8 | NNW 7 | N 7 | SSW 16 | SE 7 | SSW 14 | SE 8 | SE 7 | NE 7 | NNE 7 | SSW 16 |
| kJ | 29 | 16 | 18 | 47 | 44 | 40 | 37 | 35 | 20 | 39 | 28 | 18 | 16 | 137 | 15 | 115 | 39 | 24 | 33 | 36 | 198 |
Swell 2 Height (m) Direction Period (s) | SE 6 | SSW 13 | SSW 12 | N 5 | NNE 5 | SSE 13 | SSW 11 | SSW 11 | SW 15 | SW 14 | SW 14 | SW 14 | SE 7 | SE 6 | SSW 14 | SE 8 | NE 7 | SSW 13 | SSW 13 | S 18 | NNE 7 |
| kJ | 9 | 55 | 48 | 4 | 9 | 58 | 39 | 37 | 57 | 54 | 52 | 53 | 19 | 12 | 77 | 20 | 11 | 99 | 98 | 156 | 37 |
Swell 3 Height (m) Direction Period (s) | ENE 8 | SE 7 | SE 9 | NE 6 | SSW 16 | SW 15 | S 13 | SSE 12 | S 12 | NNW 8 | SSE 11 | S 11 | SW 14 | N 7 | NNE 7 | NE 7 | SW 18 | NE 6 | SSE 10 | SSW 12 | SE 8 |
| kJ | 14 | 13 | 23 | 5 | 53 | 59 | 52 | 49 | 26 | 13 | 25 | 38 | 52 | 15 | 15 | 12 | 81 | 14 | 37 | 59 | 32 |
Wind waves Height (m) Direction Period (s) | E 8 | ENE 8 | E 8 | E 8 | E 11 | ENE 11 | E 5 | ENE 10 | E 5 | ENE 9 | E 5 | E 5 | E 4 | E 5 | E 6 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 |
| kJ | 266 | 250 | 161 | 140 | 351 | 400 | 66 | 240 | 39 | 99 | 57 | 34 | 30 | 83 | 101 | 168 | 199 | 205 | 209 | 239 | 233 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 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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