Waimea Rivermouth Surf Break

Lat Long: 21.95° N 159.67° W

Waimea Rivermouth Surf Forecast and Surf Report

Issued: 1 pm 21 Jul 2026 (local time)

Forecast update in  hr  min

Today's Waimea Rivermouth sea temperature is
26.8° C
0.4° 

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 22 Jul 2026:

  • Best quality surf: Tuesday 28 Jul, 11AM (local time) - 5.5ft (1.7m), 14s period, E swell with glassy winds.
  • Most powerful swell: Tuesday 28 Jul, 11AM (local time) - 5.5ft (1.7m), 14s period, E swell with 1,081 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 21 Jul, 8PM (local time) - 2.5ft (0.8m), 14s period with S 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 (Jul 21) at 8PM. The primary swell is predicted to be 0.8m and 14s period with a secondary swell of 0.2m and 5s. 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 1.7m 14s and forecast to arrive on Tuesday (Jul 28) at 11AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Wednesday (Jul 22) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Tue 21st Jul)2.5ft (0.8m) 14s
Best Surf11AM (Tue 28th Jul)5.5ft (1.7m) 14s
Most Powerful11AM (Tue 28th Jul)5.5ft (1.7m) 14s

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


The Lowdown

Alright, folks, Rusty here. Let's talk about the waves at Waimea Rivermouth.

We've got a nice run of surf coming up at this beginner-friendly spot, which is fairly consistent. The water's at 80°, right about where you'd expect it for the time of year.

The action starts Tuesday afternoon, July 21st, with a clean 3 ft S swell. A good start, but the real meat of the forecast kicks in from Wednesday the 22nd through the weekend. The wave energy builds into the moderate range, with a mix of S and SSW swells. That SSW swell hits a 20-second period on the 23rd, a real long-period groundswell that'll wrap in nicely. Winds are a steady cross-off breeze, keeping things clean and rideable despite some rain showers.

The standout is Thursday morning, July 23rd. We've got a 2 ft SSW groundswell, a 20-second period, and the wave energy is pumping. The winds are a moderate cross-off, and the break is exposed to the swell with the optimum direction from the S. It's going to be a ripper of a session for a beginner-friendly wave. Crowds are possible, so get down early.

Into Friday the 24th, the morning gets a bit bigger with a 6 ft E swell, but the period drops to 7 seconds, making it a bit messy. The better call is the afternoon's 3 ft SSW groundswell at 17 seconds. The weekend stays solid, with clean, light breezes, and the SSW groundswell persists through Sunday the 26th.

The biggest standout of the whole forecast, though, is Tuesday morning, July 28th. We're looking at 6 ft, glassy conditions, and a massive wave energy reading. That swell is coming from the E with a 14-second period. This is a more powerful, clean day. At 6 ft, it's getting into the zone where it's a bit much for beginners, but experienced surfers will be loving it. The glassy wind and solid energy make this the true peak of the run.

The surf drops off again after that, with smaller, glassy days through the end of July and into early August. The first week of August sees a return of consistent but smaller E swells in the 4 ft to 5 ft range, generally clean.

The last standout to note is Wednesday afternoon, August 5th, with a glassy 5 ft E swell, though the period is short at 6 seconds.

So, to sum it up: the best bet is the glassy 6 ft on Tuesday morning, July 28th, for the experienced crew, and the clean, long-period SSW groundswell on Thursday, July 23rd, for the beginners.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Tue afternoon. Warm (max 26°C on Tue afternoon, min 23°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Sat afternoon. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light.

Tue
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
3
3
3
2
3
3
3
3
3
2
3
3
3
3
2
3
2
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
S
14
0.9
S
13
0.9
S
14
0.6
SSW
23
0.6
SSW
22
0.7
SSW
20
0.7
SSW
20
1.9
E
7
1.8
E
7
0.8
SSW
17
0.6
S
20
0.8
SSW
19
0.9
SSW
19
0.9
SSW
18
0.9
SSW
16
0.9
SSW
16
0.8
SSW
16
0.7
SSW
15
0.7
SSW
15
0.7
SSW
14
Wave Graph
Metric surfscale
Energy kJ
257
268
315
429
366
416
399
344
303
340
305
502
583
516
448
427
333
228
222
213
Wind (km/h)
10
E
15
E
15
E
15
ENE
15
ENE
15
E
15
ENE
15
ENE
15
E
15
ENE
15
ENE
5
ENE
10
NE
15
ENE
10
E
10
ENE
15
ENE
10
ENE
5
E
10
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
High Tide
12:17PM0.45m
1:09PM0.49m
1:51PM0.52m
00:27AM0.16m
2:27PM0.53m
1:30AM0.16m
3:01PM0.55m
2:13AM0.17m
3:32PM0.56m
2:49AM0.19m
Low Tide
3:56AM0.05m
4:46AM0.04m
5:39AM0.03m
10:22PM0.16m
6:29AM0.02m
10:26PM0.14m
7:14AM-0.00m
10:38PM0.13m
7:54AM-0.02m
10:52PM0.13m
rain showers
clear
rain showers
rain showers
clear
clear
part cloud
clear
clear
part cloud
clear
part cloud
rain showers
rain showers
clear
part cloud
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:07
6:07
6:07
6:07
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:22
7:22
7:22
7:21
7:21
7:21
 mm
2
1
2
1
2
Temp °C
26
25
26
26
25
25
26
25
25
26
25
26
26
25
26
26
25
25
26
24
Feels °C
28
26
27
26
25
25
26
25
25
26
26
28
27
26
27
26
25
26
28
24
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  • 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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