Waimea Rivermouth Surf Break

Lat Long: 21.95° N 159.67° W

Waimea Rivermouth Surf Forecast and Surf Report

Issued: 7 pm 10 Jul 2026 (local time)

Forecast update in  hr  min

Today's Waimea Rivermouth sea temperature is
26.2° C
0.0° 

Waimea Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Waimea Rivermouth surf forecast from 11 Jul 2026:

  • Best quality surf: Sunday 12 Jul, 8AM (local time) - 2.5ft (0.7m), 16s period, SW swell with cross-offshore winds.
  • Most powerful swell: Sunday 12 Jul, 2PM (local time) - 6ft (1.8m), 7s period, E swell with 329 kJ wave energy.
  • Next surfable swell (1★+): Saturday 11 Jul, 5AM (local time) - 1.5ft (0.4m), 19s 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 Saturday (Jul 11) at 5AM. The primary swell is predicted to be 0.4m and 19s 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 1.8m 7s and forecast to arrive on Sunday (Jul 12) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Thursday (Jul 16) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Sat 11th Jul)1.5ft (0.4m) 19s
Best Surf 8AM (Sun 12th Jul)2.5ft (0.7m) 16s
Most Powerful 2PM (Sun 12th Jul)6ft (1.8m) 7s

Table - best surf conditions forecast for Waimea Rivermouth over the next 16 days.


Alright, it's Rusty, and we're looking at Waimea Rivermouth for the next couple of weeks. There's a bit of a mixed bag, but a few days are proper gems, so keep your eyes peeled.

We start off with some real surf on Saturday, July 11th. Waves are around 5 ft out of the east with a short 8-second period, and the combined swell energy is moderate at 474. The east-northeast cross-off breeze will keep it clean and manageable for beginners. But the real standout early on is Sunday, July 12th. The morning brings a smaller 2 ft swell from the south-west with a nice long period of 16 seconds, and the combined energy jumps to 526 – that's moderate-strong. It means more punch, better shaped waves, and those longer lulls between sets make it easier to get out. With rain showers and a decent cross-off wind, the river mouth will be clean and juicy. It's not big, but it'll be quality.

Water temp is sitting right around average for this time of year, no crazy talk there.

Monday, July 13th keeps the same 5 ft east swell with 8 seconds and moderate-strong combined energy of 531. Morning session with cross-off wind is your best bet. Tuesday, July 14th sees the swell drop to 2 ft but it switches to a 16-second west groundswell. The combined energy is still decent at 449. The real beauty is Tuesday afternoon – offshore wind from the north-east, so you're looking at glassy, clean waves. Small but that west swell at a spot like this? It'll draw some nice lines.

Wednesday, July 15th is a bit rough in the morning with cross-shore wind and marginal surf. The afternoon is the better call with cross-off wind and a 3 ft west groundswell at 15 seconds. Thursday, July 16th is a sleeper. Swell is only 2 ft west at 14 seconds, but the afternoon shows *glassy* conditions. No wind. That's a golden window for a clean, peaceful session.

Friday, July 17th through the weekend, it gets ugly. Poor surf and marginal conditions, wind is up and the swell is messy. Saturday, July 18th and Sunday, July 19th are pretty weak, with very ordinary conditions and low energy. Monday, July 20th and Tuesday, July 21st are mostly forgettable – surfable but nothing to write home about.

Then things pick up again on Wednesday, July 22nd. The morning has 2 ft of south swell at 14 seconds, combined energy of 389, and a light cross-off breeze. Clean and small, but fun. Thursday, July 23rd is a solid pickup. The east swell returns at a consistent 4 ft with 7-second period, and the morning hits 489 combined energy – moderate-strong. Light wind keeps it clean all day.

Friday, July 24th starts with a glassy morning, 2 ft out of the south-southwest with a gorgeous 18-second period. That's long-period groundswell, real power. Combined energy is 372, moderate. It'll look smooth and peel nicely at the river mouth. But the big standout for the whole two weeks is Saturday, July 25th. Morning glass – zero wind – with a 2 ft south-southwest swell at 16 seconds and combined energy shooting to 470. Then the afternoon stays glassy, and the wind switches to the optimum north-northeast. That's offshore-wind glass for two sessions in a row. The swell builds to 5 ft from the east at 7 seconds. Afternoon combined energy is 417. That Saturday is the one. It won't be too heavy for anyone, and the river mouth might get a little busy since crowds are possible, but if you can get out there, do not miss it. Sunday, July 26th wraps it up with another glassy morning of 5 ft east swell, still no wind. Clean, fun, easy access.

So, mark Saturday, July 25th as your top pick – epic conditions, glassy, with a solid mix of swells. Sunday, July 12th morning is also a true standout for quality over size. The rest has some fun sessions, but those two days are the keepers.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sun morning. Warm (max 27°C on Sat afternoon, min 24°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Wed morning. Warm (max 27°C on Wed afternoon, min 23°C on Mon night). Wind will be generally light.

Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Fri
17
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
1
2
2
2
3
3
1
3
2
2
2
2
3
1
2
2
2
2
2
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
E
7
1.6
E
8
0.6
SSW
18
0.6
SSW
17
1.6
E
7
1.7
E
7
0.7
SW
16
1.6
E
8
1.6
E
8
1.3
E
8
0.7
W
16
0.7
W
16
0.8
W
16
0.8
W
15
0.8
W
15
0.8
W
15
0.7
W
14
0.7
W
14
0.6
W
14
0.6
W
14
1.6
E
6
Wave Graph
Metric surfscale
Energy kJ
298
290
207
202
261
303
248
310
283
213
260
254
306
294
283
272
206
203
148
142
188
Wind (km/h)
15
ENE
10
ENE
10
ENE
15
ENE
15
E
15
ENE
15
ENE
10
E
10
E
10
NE
5
E
10
NNE
10
ENE
15
ESE
5
E
10
ENE
10
E
5
ENE
15
ENE
20
E
15
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross
cross-off
cross-off
cross-off
glassy
cross-off
cross-off
cross-off
High Tide
11:39PM0.17m
2:26PM0.63m
1:07AM0.16m
3:11PM0.67m
2:14AM0.16m
3:54PM0.68m
3:12AM0.18m
4:36PM0.67m
4:07AM0.20m
5:15PM0.64m
5:03AM0.23m
5:52PM0.59m
6:03AM0.25m
6:26PM0.53m
Low Tide
9:41PM0.17m
6:29AM-0.07m
10:15PM0.14m
7:21AM-0.10m
10:48PM0.12m
8:12AM-0.11m
11:22PM0.10m
9:01AM-0.10m
11:55PM0.09m
9:48AM-0.08m
00:28AM0.09m
10:35AM-0.02m
1:00AM0.08m
11:23AM0.05m
clear
clear
part cloud
part cloud
rain showers
rain showers
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
rain showers
rain showers
clear
part cloud
part cloud
part cloud
rain showers
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:03
6:03
6:03
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:24
7:24
7:24
7:24
7:24
7:24
7:23
7:23
 mm
1
1
2
2
1
Temp °C
25
26
27
25
26
26
25
26
27
25
26
26
25
26
27
25
27
27
25
26
26
Feels °C
25
27
29
26
27
26
25
26
27
25
28
27
27
26
28
27
29
29
27
27
26
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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