
Surf Forecasts:
Waimea Rivermouth surf forecast from 9 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 11PM (local time) - 3ft (0.9m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Saturday 12 Sep, 2AM (local time) - 4.5ft (1.3m), 11s period, E swell with 388 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 11PM (local time) - 3ft (0.9m), 14s 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 Tuesday (Sep 08) at 11PM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 1.2m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Waimea Rivermouth in the next 16 days are 1.3m 11s and forecast to arrive on Saturday (Sep 12) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 7s period and expected on Thursday (Sep 10) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Tue 8th Sep) | 3ft (0.9m) 14s |
| Best Surf | 11PM (Tue 8th Sep) | 3ft (0.9m) 14s |
| Most Powerful | 2AM (Sat 12th Sep) | 4.5ft (1.3m) 11s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
The Lowdown
Hey folks, Rusty here. Let's look at what's coming up for Waimea Rivermouth. It's a bit of a slow start, but there's a solid run of clean swell to look forward to later on.
Right now, the surf is pretty ordinary. We've got some south swell pushing in at 6 ft but the wind is onshore from the SW at 9 mph, making for poor conditions. The combined swell energy is moderate though, sitting at 847. It's not worth paddling out for.
Wednesday and Thursday will be small but clean. Wednesday morning starts with a 3 ft south-southwest swell and a long period of 14 seconds, but a light cross-onshore breeze. By Wednesday afternoon, the wind turns glassy and the swell drops to 2 ft from the SSW with a 13 second period. The water temp is a warm 80°, which is pretty much normal for this time of year. Thursday is similar, with glassy conditions in the morning and a tiny 2 ft SSW swell. Good for a beginner session on a longboard, but nothing exciting.
Friday the 11th brings a small bump up to 4 ft, but it's from the east with a short period of just 7 seconds, so it won't have much push. From Saturday the 12th right through to Tuesday the 17th of September, the swell stays small, mostly between 1 ft and 2 ft, but what’s good is the wind is often glassy or light cross-offshore. The combined energy is low to moderate, bottoming out around 60 on the 13th. Still, with clean conditions, it’s rideable for the learners.
Now, here’s where it gets interesting. The standout window is from Wednesday the 18th of September through Saturday the 21st. The swell picks up to 3 ft from the SSW, with a 15-17 second period – that’s proper groundswell. Combined wave energy climbs into the strong range, hitting 742 on Friday morning. The wind is clean every day, either glassy or light cross-offshore. This is the best run of the whole outlook. This size and period will work nicely at the rivermouth, offering clean, lined-up waves. It's rated for beginners and is fairly consistent, but remember it can get crowded here sometimes. Saturday the 21st still sees good energy at 394 and glassy conditions.
The last few days of the forecast, from the 22nd, it fades back to small, poor surf with onshore wind. The east swell on the 23rd at 3 ft has a short 8 second period, so no real quality there.
So, if you've got some flexibility, hold out for the 18th through 21st. That's the time to be at Waimea Rivermouth.
- Rusty
Short Range ForecastLight rain (total 9mm), mostly falling on Tue afternoon. Warm (max 28°C on Wed afternoon, min 24°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sat afternoon. Warm (max 27°C on Mon morning, min 24°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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 9 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | E 7 | E 7 | SSW 15 | E 11 | SW 16 | SSW 16 | SSW 13 | SSW 15 | SW 14 | SW 14 | SW 23 | SW 22 | SW 21 |
Wave Graph | ||||||||||||||||||||
432 | 356 | 277 | 187 | 178 | 131 | 119 | 171 | 128 | 150 | 388 | 64 | 98 | 68 | 84 | 54 | 51 | 85 | 118 | 117 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross-on | glassy | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | glassy | glassy | cross-off | glassy | glassy | cross-off |
High Tide | 2:28PM0.60m | 2:29AM0.32m | 3:02PM0.58m | 3:12AM0.37m | 3:33PM0.54m | 3:54AM0.42m | 4:02PM0.48m | 4:35AM0.46m | 4:26PM0.43m | 5:18AM0.48m | 4:48PM0.37m | 6:01AM0.49m | 5:03PM0.31m | |||||||
Low Tide | 9:19PM0.10m | 8:12AM0.02m | 9:39PM0.09m | 9:00AM0.04m | 10:00PM0.07m | 9:47AM0.08m | 10:20PM0.06m | 10:34AM0.12m | 10:41PM0.05m | 11:23AM0.17m | 11:02PM0.05m | 12:18PM0.21m | 11:24PM0.05m | |||||||
— | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | |
6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:44 | — | — | 6:43 | — | |
mm | 3 | 1 | — | — | — | — | 2 | 3 | — | — | — | — | 2 | 1 | — | — | — | — | — | — |
Temp °C | 26 | 26 | 27 | 28 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 27 | 27 | 26 |
Feels °C | 27 | 30 | 30 | 31 | 31 | 31 | 30 | 29 | 28 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 8 | NNW 9 | NW 10 | NNW 9 | SSW 13 | SSW 12 | SW 16 | SW 16 | SSW 15 | SSW 15 | NE 8 | NE 9 | NNE 9 | NNE 8 | NNE 9 | NE 9 | NE 8 | NE 8 | NNE 8 |
432 | 157 | 168 | 211 | 96 | 131 | 119 | 129 | 121 | 150 | 148 | 31 | 37 | 50 | 48 | 50 | 37 | 35 | 34 | 27 | |
Swell 2 Height (m) Direction Period (s) | NW 9 | NNW 8 | SSW 14 | SSW 13 | SSW 13 | NNW 8 | NE 8 | SSW 12 | NE 7 | NE 8 | NE 7 | SW 16 | SSW 16 | SSW 13 | SSW 15 | SW 14 | SW 14 | SW 14 | SW 22 | SW 21 |
304 | 117 | 277 | 187 | 178 | 59 | 46 | 81 | 23 | 28 | 25 | 64 | 98 | 68 | 84 | 54 | 51 | 49 | 118 | 117 | |
Swell 3 Height (m) Direction Period (s) | SSW 15 | SSW 14 | S 8 | S 8 | S 7 | SSW 17 | NW 8 | NE 7 | SSW 12 | SSW 12 | SSW 12 | SW 13 | SE 6 | SE 5 | SSE 8 | SSE 8 | SE 9 | SW 23 | SW 14 | SW 13 |
376 | 356 | 57 | 41 | 27 | 109 | 32 | 32 | 46 | 45 | 44 | 46 | 8 | 8 | 11 | 6 | 13 | 85 | 47 | 44 | |
Wind waves Height (m) Direction Period (s) | W 6 | — | — | — | — | ENE 8 | E 2 | E 7 | E 7 | E 5 | E 11 | ENE 10 | SE 5 | ESE 5 | — | E 6 | E 5 | E 6 | E 5 | E 5 |
39 | — | — | — | — | 151 | 1 | 171 | 128 | 51 | 388 | 133 | 18 | 35 | — | 9 | 20 | 30 | 21 | 27 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 36 | 0 | 18 | 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 | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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










