Waimea Rivermouth Surf Break

Lat Long: 21.95° N 159.67° W

Waimea Rivermouth Surf Forecast and Surf Report

Issued: 7 am 19 Jul 2026 (local time)

Forecast update in  hr  min

Today's Waimea Rivermouth sea temperature is
26.7° C
0.3° 

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 19 Jul 2026:

  • Best quality surf: Thursday 23 Jul, 2PM (local time) - 6.5ft (2.0m), 7s period, E swell with cross-offshore winds.
  • Most powerful swell: Saturday 25 Jul, 5PM (local time) - 3ft (0.9m), 19s period, SSW swell with 583 kJ wave energy.
  • Next surfable swell (1★+): Sunday 19 Jul, 5PM (local time) - 4ft (1.2m), 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 Sunday (Jul 19) at 5PM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.5m and 13s. 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 Saturday (Jul 25) at 5PM. 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 8s period and expected on Saturday (Jul 25) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Sun 19th Jul)4ft (1.2m) 8s
Best Surf 2PM (Thu 23rd Jul)6.5ft (2.0m) 7s
Most Powerful 5PM (Sat 25th Jul)3ft (0.9m) 19s

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


The Lowdown

Alright, talkin' surf now. This is Rusty, and we’re looking at the next two weeks for the North Shore. Water temp is sitting at 80°F, which is pretty much right where it should be for July.

The first few days are a bit of a slow cooker. Sunday the 19th through Monday the 20th gives us small, clean lines from the east. We’re talking about 3 to 4 feet, with a light cross-off breeze keeping the surface smooth. The energy is moderate (364), and with a short 8-second period, these are friendly, crumbly waves. Good for a beginner to get wet.

Then the real stuff starts. Tuesday the 21st, the swell turns south, and the period jumps to 15 seconds. The wave height drops to about 2 feet, but the energy is up to 395. That’s a proper groundswell with some grunt. The standout is Wednesday, July 22nd. The swell is tiny at 2 feet, but the period is a massive 24 seconds. The combined energy hits 703. That’s a classic Waimea Rivermouth setup. The wind is a gentle cross-off, so the sets will be glassy. This is the best quality wave of the first week. Thursday the 23rd keeps that 20-second period going, with energy climbing to 891.

Friday the 24th throws a curveball. The swell swings back east, but the period drops to 7 seconds, and the height jumps to 6 to 6 feet. That’s a lot of short-period, lumpy white water. It’s rideable, but it's not the good stuff.

The second week picks up again. Saturday the 25th brings back the long-period SSW groundswell, with energy hitting 1053. That’s strong. Sunday the 26th through Monday the 27th holds steady with clean 3 to 3 foot waves from the SSW, with periods of 15-16 seconds. The wind is light, turning glassy on Monday afternoon.

The big highlight of the whole 16 days is Tuesday, July 28th. The morning shows a 6-foot east swell with a 13-second period, but the combined energy is a massive 1216. The wind is light and glassy. This is a standout, but a 6-foot east swell at the river mouth can break straight and fast, making it a challenge for experts only. It drops off to weak, ordinary conditions right after that.

The final days into August are small and weak, with glassy conditions but no real energy.

So, for the best on offer: Wednesday, July 22nd is the pick for quality, long-period groundswell. And Tuesday, July 28th is the big, powerful one, but it’s for the experienced guys only. The rest is small, clean, and fun for the beginners.

This is Rusty, out.

Short Range Forecast

Some drizzle, heaviest during Tue afternoon. Warm (max 27°C on Sun afternoon, min 23°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Thu afternoon, min 23°C on Wed night). Wind will be generally light.

Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
2
2
2
2
2
2
1
3
3
2
3
4
2
3
3
3
3
4
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
E
8
1.2
E
8
1.1
E
8
1.1
E
8
1.1
E
8
1.2
E
7
0.7
S
15
0.8
S
14
0.9
S
13
0.5
S
24
0.6
SSW
23
0.7
SSW
22
0.7
SSW
20
0.7
SSW
20
1.8
E
7
1.7
E
7
1.9
E
7
1.7
E
8
0.8
SSW
19
0.9
SSW
19
0.9
SSW
18
Wave Graph
Metric surfscale
Energy kJ
217
187
153
141
135
139
212
257
281
284
429
480
416
399
344
310
357
328
502
583
516
Wind (km/h)
10
NE
15
ENE
15
E
10
E
10
ENE
15
NE
5
E
10
ENE
15
ENE
10
E
5
E
15
ENE
15
E
15
E
15
ENE
10
ENE
10
E
15
ENE
10
ENE
15
NE
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
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
8:22AM0.32m
7:23PM0.38m
9:46AM0.36m
7:41PM0.31m
11:09AM0.41m
12:17PM0.45m
1:09PM0.49m
1:51PM0.52m
00:27AM0.16m
2:27PM0.53m
1:30AM0.16m
Low Tide
1:25PM0.22m
2:37AM0.06m
3:25PM0.28m
3:13AM0.05m
3:56AM0.05m
4:46AM0.04m
5:39AM0.03m
10:22PM0.16m
6:29AM0.02m
10:26PM0.14m
clear
part cloud
clear
clear
part cloud
clear
clear
rain showers
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:05
6:07
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:22
7:22
7:22
7:22
7:22
7:21
 mm
1
Temp °C
26
27
25
27
27
25
27
26
25
26
26
25
26
27
25
26
27
25
26
26
25
Feels °C
27
28
25
27
28
26
29
27
26
26
27
26
26
27
25
26
28
25
27
27
25
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  • 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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