Surf Forecasts:
Waimea Rivermouth surf forecast from 9 Sep 2026:
- Best quality surf: Friday 11 Sep, 2PM (local time) - 4.5ft (1.3m), 11s period, E swell with glassy winds.
- Most powerful swell: Friday 11 Sep, 2PM (local time) - 4.5ft (1.3m), 11s period, E swell with 411 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 5PM (local time) - 2.5ft (0.7m), 13s 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 Wednesday (Sep 09) at 5PM. The primary swell is predicted to be 0.7m and 13s period. 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 Friday (Sep 11) at 2PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 10s period and expected on Wednesday (Sep 09) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Wed 9th Sep) | 2.5ft (0.7m) 13s |
| Best Surf | 2PM (Fri 11th Sep) | 4.5ft (1.3m) 11s |
| Most Powerful | 2PM (Fri 11th Sep) | 4.5ft (1.3m) 11s |
Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.
The Lowdown
Right, listen up. Rusty here, and I've been staring at the charts for Waimea Rivermouth. Let's be straight with you—it's a bit of a slow-burner for the first week, but patience is going to pay off in the second.
We start off with a bit of a nothing-burger on Wednesday the 9th. The morning’s a write-off with poor surf and a cross-on wind. It’s a beginner spot, so the little 3ft swell from the SSW and moderate energy (334) isn't doing it any favours. The afternoon goes glassy, clean as a whistle, but the swell drops to 2ft. It’s rideable, but nothing to get excited about. Thursday and Friday are much the same story—small, clean, but tiny. The water is sitting at 80°, which is bang on average for this time of year. The real action starts to brew from the middle of next week.
Now, the standout. The best on offer is a dead-set cracker on the afternoon of Monday the 23rd of September. We’ve got a 5ft swell from the East with a solid 13-second period pushing in. The combined energy is a meaty 1006, which is serious grunt for this break. The wind is glassy, so it’ll be pristine. This is prime for a beginner-friendly spot like the Rivermouth, but given the size, it’s going to be a fun one for everyone. Keep an eye on that.
The week prior, from the 17th of September, we start to see a pulse. The Thursday afternoon has a 6ft East swell, but it’s a short-period 6 seconds, so it’ll be a bit lumpy and closed out. It’s clean, but not the best shape. The Saturday the 19th has a similar story with a 6ft East swell. The real consistent run of good surf kicks off around the 18th and 19th, with clean, cross-off winds and waist-to-chest high waves. The combined energy picks up to over 800, which is a solid moderate energy.
There’s a bit of a gap in the first week with nothing worth racing for. Monday the 22nd of September has a 6ft East swell with a 12-second period, but the morning is a bit cross. The afternoon cleans up and is very good, but the 23rd is the absolute winner.
So, to sum it up: the first week is for the longboard and the patient. The second week, especially the 23rd, is the one to circle on the calendar. It’s a long way out, so the forecast could shift, but right now it looks like the session of the fortnight.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Thu afternoon. Warm (max 27°C on Wed morning, min 24°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Sat morning, min 24°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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) | SSW 14 | SSW 13 | SSW 13 | SSW 13 | E 8 | E 7 | E 7 | SSW 15 | SSW 15 | E 10 | SSW 16 | SSW 13 | SSW 15 | SW 14 | SW 14 | SW 23 | SW 22 | SW 21 | SSW 20 | SSW 19 | SSW 19 |
Wave Graph  | |||||||||||||||||||||
 kJ | 277 | 187 | 178 | 131 | 138 | 150 | 124 | 150 | 148 | 158 | 98 | 68 | 84 | 54 | 51 | 85 | 118 | 117 | 256 | 251 | 243 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | cross | glassy | cross-off | cross-off | glassy | cross-off | cross | glassy | cross-off | cross-off | glassy | off | glassy | glassy | glassy | glassy | glassy | glassy |
High Tide | 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 | 6:48AM0.48m | 5:03PM0.26m | ||||||||
Low Tide | 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 | 1:35PM0.25m | 11:47PM0.06m | |||||||
 | |  | |  |  | |  |  | | | | | | | | | | | | | |
 | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — |
 | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — |
mm | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 |
Feels °C | 30 | 30 | 31 | 30 | 30 | 29 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | NNW 10 | NW 9 | NW 8 | SSW 13 | SSW 12 | SSW 12 | SW 16 | SSW 15 | SSW 15 | NE 8 | NE 9 | NNE 9 | NNE 9 | NNE 9 | NNE 9 | NE 8 | NE 8 | NNE 8 | SSW 20 | SSW 19 | SSW 19 |
| kJ | 342 | 237 | 59 | 131 | 121 | 81 | 121 | 150 | 148 | 31 | 38 | 52 | 50 | 49 | 50 | 35 | 34 | 26 | 256 | 251 | 243 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SSW 13 | SSW 13 | NNW 8 | NE 8 | SW 16 | SSW 12 | NE 8 | NNE 7 | SW 16 | SSW 16 | SSW 13 | SSW 15 | SW 14 | SW 14 | SW 14 | SW 22 | SW 21 | NNE 8 | NNE 7 | NNE 5 |
| kJ | 277 | 187 | 178 | 44 | 28 | 129 | 46 | 28 | 21 | 64 | 98 | 68 | 84 | 54 | 51 | 49 | 118 | 117 | 25 | 21 | 8 |
Swell 3 Height (m) Direction Period (s) | S 8 | S 8 | S 7 | SSW 17 | NW 8 | NE 7 | NE 7 | SE 5 | SSW 12 | SW 13 | SE 5 | SE 5 | NW 13 | SSE 10 | SE 5 | SW 23 | SW 14 | SW 13 | SSW 12 | SSW 12 | NE 7 |
| kJ | 57 | 41 | 26 | 109 | 28 | 25 | 21 | 10 | 44 | 46 | 4 | 6 | 28 | 9 | 6 | 85 | 47 | 44 | 30 | 29 | 14 |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 3 | E 8 | E 7 | E 7 | ESE 5 | E 11 | E 10 | ESE 4 | E 4 | E 9 | E 9 | E 5 | E 5 | E 5 | E 5 | E 5 | ENE 5 | ENE 5 |
| kJ | — | — | — | 1 | 138 | 150 | 124 | 109 | 233 | 158 | 13 | 18 | 59 | 41 | 62 | 36 | 63 | 37 | 25 | 42 | 42 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 3 | 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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