Waimea Rivermouth Surf Break

Lat Long: 21.95° N 159.67° W

Issued: 1 am 05 Jul 2026 (local time)

Forecast update in  hr  min

Today's Waimea Rivermouth sea temperature is
26.0° C

Normal for this time of year

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 5 Jul 2026:

  • Best quality surf: Sunday 5 Jul, 11AM (local time) - 2.5ft (0.8m), 18s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Saturday 11 Jul, 2AM (local time) - 7ft (2.1m), 8s period, E swell with 537 kJ wave energy.
  • Next surfable swell (1★+): Sunday 5 Jul, 11AM (local time) - 2.5ft (0.8m), 18s 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 Sunday (Jul 05) at 11AM. The primary swell is predicted to be 0.8m and 18s 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 2.1m 8s and forecast to arrive on Saturday (Jul 11) 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 2.1m 8s period and expected on Friday (Jul 10) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Sun 5th Jul)2.5ft (0.8m) 18s
Best Surf11AM (Sun 5th Jul)2.5ft (0.8m) 18s
Most Powerful 2AM (Sat 11th Jul)7ft (2.1m) 8s

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


Updates in  hr  min  s Forecast update imminent

Alright, let’s talk Waimea Rivermouth in feet and Fahrenheit.

We kick off on Sunday, July 5th. Water temp is about 79°, which is dead average for this time of year – no surprises there.

Sunday morning brings waist-high swell, about 2-3 feet of SSW groundswell, with a long 18-second period. That’s proper energy, moderate at 536. The wind is a gentle cross-off from the ENE, keeping it clean. Perfect for the Rivermouth – that long period will wrap in sweet. It’s small enough for the beginners to have a go. Afternoon bumps up to about 3 feet, still a 12 mph cross-off, still clean. This is a top notch window.

Monday the 6th: same size, around 3 feet, period drops from 16 to 15 seconds. Clean, light breeze, moderate energy. Good fun.

Tuesday the 7th: still about 3 feet, 14 seconds in the morning, dropping to 2-3 feet by the arvo. Clean.

Wednesday the 8th: swell shifts east, now 5-6 feet but with a short 8-second period – that’s windswell, not groundswell. Clean, gentle cross-off. The energy is moderate (593). It’s getting too big for beginners now. This holds through Thursday (5-6 feet, 7-8 seconds) and Friday (5-6 feet, 7 seconds). Still clean.

Saturday the 11th is another highlight: 6-7 feet from the east, 8-second period, energy is solid moderate (597-667). Steady cross-off wind. It’s pushy, but clean.

Sunday the 12th drops back to 2-3 feet, but the period jumps to 16 seconds from the SW – classic groundswell. Light cross-off, glassy. Energy moderate (513-525). This is a beautiful small window for the Rivermouth.

Monday the 13th stays small (2-3 feet, 15 seconds), light breeze. Afternoon goes west with a 17-second period, moderate cross-off, energy jumps to 786. Tuesday the 14th: 2-3 feet of W groundswell at 16 seconds, light to gentle cross-off. Clean.

Wednesday the 15th and Thursday the 16th: same size, long period (15-16 seconds), light to gentle cross-off. Thursday afternoon goes glassy with a light cross-shore.

Friday the 17th is a real standout. Glassy conditions in the morning, 5 feet from the east at only 7 seconds. That’s windswell, but with glass-off, it’ll be clean. Energy moderate (500). Not for beginners, but for the experienced crew, it’s a sweet little window.

Saturday the 18th drops to 4-5 feet, short period (6-7 seconds), clean cross-off. Nothing special.

From Sunday the 19th onward, it fades. Sunday morning: 3-4 feet, glassy but “ordinary”. Afternoon picks up to 4 feet with 8 seconds. Monday the 20th: about 4 feet, short period, glassy spells. The energy is dropping to weak-moderate (190-249). The run is fizzling out.

The real standouts are Sunday the 5th and Sunday the 12th – long-period groundswell, clean winds, manageable size. Friday the 17th with glassy conditions is also a cracker for the experienced.

Crowds are “sometimes”, so you might see a few heads, but nothing crazy.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Sun afternoon. Warm (max 26°C on Sun morning, min 23°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Fri afternoon. Warm (max 27°C on Wed afternoon, min 23°C on Wed night). Wind will be generally light.

Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
Saturday
11
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
3
1
2
3
1
2
2
2
3
3
1
2
2
0
2
2
3
3
3
3
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
SSW
18
0.9
SSW
18
0.8
SSW
16
0.9
SSW
16
1.7
E
8
0.8
SSW
15
0.9
SSW
14
0.8
SSW
14
1.7
E
8
1.8
E
8
1.7
E
8
1.7
E
7
1.7
E
7
1.7
E
8
0.5
S
12
1.8
E
7
1.8
E
7
2.1
E
8
1.9
E
8
1.8
E
8
1.6
E
8
Wave Graph
Metric surfscale
Energy kJ
418
510
350
421
380
284
350
273
365
398
323
287
315
332
75
358
358
537
464
377
309
Wind (km/h)
10
ENE
15
E
15
ENE
15
ENE
15
ENE
15
ENE
15
ENE
15
ENE
15
ENE
15
E
10
ENE
15
ENE
10
E
15
E
15
ENE
10
E
10
ENE
15
ENE
15
ENE
15
ENE
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
7:21PM0.43m
9:20AM0.28m
7:49PM0.37m
10:43AM0.35m
8:18PM0.31m
11:53AM0.44m
8:51PM0.25m
12:49PM0.52m
9:52PM0.20m
1:39PM0.58m
11:39PM0.17m
2:26PM0.63m
1:07AM0.16m
Low Tide
12:30PM0.15m
2:49AM0.06m
1:52PM0.23m
3:22AM0.04m
4:16PM0.27m
4:01AM0.01m
6:58PM0.26m
4:47AM-0.02m
8:54PM0.21m
5:37AM-0.05m
9:41PM0.17m
6:29AM-0.07m
10:15PM0.14m
clear
rain showers
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
clear
part cloud
rain showers
rain showers
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:00
6:00
6:01
6:01
6:01
6:01
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:25
7:25
7:25
7:25
7:24
7:24
7:24
 mm
1
1
1
Temp °C
26
26
25
25
26
24
25
26
24
25
27
25
26
27
25
26
27
25
25
26
24
Feels °C
27
27
25
25
26
23
25
26
23
25
27
25
27
27
25
28
29
26
25
27
23
Swell 1
Height (m)
Direction
Period (s)
0.9
NE
8
0.9
SSW
18
0.8
SSW
16
0.9
SSW
16
0.9
NNE
8
0.9
NE
8
0.9
NNE
7
0.8
NNE
8
0.8
SSW
14
0.8
NNE
8
0.7
NE
7
0.7
NE
7
0.8
NNE
7
0.7
NE
7
0.7
NE
7
0.9
NE
7
0.8
NNE
7
0.8
NNE
7
1
NE
7
0.9
NNE
7
0.9
NNE
8
Energy kJ
82
510
350
421
101
82
96
72
265
72
56
53
68
51
51
77
51
61
102
86
101
Swell 2
Height (m)
Direction
Period (s)
0.8
SSW
18
0.8
NNE
7
0.7
NE
7
0.8
NNE
7
0.9
SSW
15
0.8
SSW
15
0.9
SSW
14
0.8
SSW
14
0.8
NNE
7
0.7
S
14
0.7
S
13
0.6
S
13
0.6
S
12
0.6
S
12
0.5
S
12
0.5
S
12
0.5
S
11
0.5
NE
7
0.5
SW
18
0.6
SSW
18
0.7
SW
17
Energy kJ
418
68
54
68
380
284
350
273
66
181
176
125
112
108
75
69
66
27
159
207
309
Swell 3
Height (m)
Direction
Period (s)
0.5
SSW
14
0.4
SE
6
0.4
SE
9
0.4
SE
9
0.5
SE
9
0.4
SE
9
0.4
SE
6
0.4
SE
6
0.4
SE
8
0.4
SE
6
0.4
SE
6
0.6
SE
8
0.6
SE
6
0.6
SE
8
0.5
SE
6
0.4
SE
6
0.4
SE
6
0.4
ESE
6
0.4
S
12
0.4
SE
6
0.4
SE
6
Energy kJ
118
8
30
30
39
27
12
13
25
14
13
42
24
42
19
13
11
15
44
13
15
Wind waves
Height (m)
Direction
Period (s)
1.5
ENE
7
1.6
E
6
1.5
E
7
1.6
E
7
1.7
E
8
1.7
ENE
7
1.8
ENE
8
1.9
ENE
7
1.7
E
8
1.8
E
8
1.7
E
8
1.7
E
7
1.7
E
7
1.7
E
8
1.5
E
8
1.8
E
7
1.8
E
7
2.1
E
8
1.9
E
8
1.8
E
8
1.6
E
8
Energy kJ
228
169
218
247
329
327
375
394
365
398
323
287
315
332
258
358
358
537
464
377
294
Nearest Offshore or Glassy
Rating
(10 max)
3
3
3
2
3
2
2
2
3
3
3
2
2
2
1
2
2
3
3
3
3
Distance (km)
0
0
3
0
0
3
0
0
3
0
0
6
0
0
3
0
0
0
0
0
0
Best forecast wave conditions in Kaua'i
Rating
(10 max)
3
3
3
2
3
2
2
2
3
3
3
3
2
2
1
2
3
3
3
3
3
Best forecast wave conditions in United States
Rating
(10 max)
3
3
3
2
3
3
2
2
4
3
3
4
2
3
4
2
3
4
3
3
3
Header Global
Rating
(10 max)
7
6
5
8
7
5
5
9
8
9
6
7
8
8
6
9
6
4
9
7
7
  • 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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