Waimea Rivermouth Surf Break

Lat Long: 21.95° N 159.67° W

Issued: 1 pm 03 Jul 2026 (local time)

Forecast update in  hr  min

Today's Waimea Rivermouth sea temperature is
25.9° 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 4 Jul 2026:

  • Best quality surf: Saturday 4 Jul, 8AM (local time) - 2.5ft (0.7m), 21s period, S swell with cross-offshore winds.
  • Most powerful swell: Sunday 5 Jul, 2PM (local time) - 3ft (0.9m), 18s period, SSW swell with 522 kJ wave energy.
  • Next surfable swell (1★+): Friday 3 Jul, 11PM (local time) - 1.5ft (0.5m), 16s 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 Friday (Jul 03) at 11PM. The primary swell is predicted to be 0.5m and 16s 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 0.9m 18s and forecast to arrive on Sunday (Jul 05) 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 1.9m 7s period and expected on Tuesday (Jul 07) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Fri 3rd Jul)1.5ft (0.5m) 16s
Best Surf 8AM (Sat 4th Jul)2.5ft (0.7m) 21s
Most Powerful 2PM (Sun 5th Jul)3ft (0.9m) 18s

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


Updates in  hr  min  s Forecast update imminent

Alright crew, Rusty here, breaking down the next 16 days at Waimea Rivermouth.

We’ve got surf from the get-go, no dead period to start. The overall vibe is a slow start that builds into some really clean, fun waves, then a shift to more short-period east swell before finishing with some smaller but glassy conditions.

First up, Friday July 3rd. We’ve got a small, long-period 2ft SSW groundswell with a 17-second gap between sets. Water temp is 79°, totally average for this time of year. Light cross-off breeze, clean conditions – an easy one to get warmed up on.

Saturday July 4th and Sunday July 5th, the swell picks up to 2ft – 3ft, still from the south, with super long periods up to 21 seconds. Wave energy is moderate, and the conditions are very good each session. Classic Rivermouth – those long-period south swells wrap in beautifully, and with the cross-off wind holding, it’ll be glassy and lined up.

Monday July 6th morning is your big standout. A 3ft SSW swell, 16-second period, and the combined energy hits a strong 802. The sky is clear, wind is a light cross-off – this is the best wave of the entire run. The afternoon is still okay but the morning is the call.

Tuesday July 7th through Thursday July 9th, the swell switches to the east and jumps up to 5ft – 6ft, but the period drops to a short 7-8 seconds. This is windswell, not ideal for the Rivermouth which prefers a south pulse. With 5ft+ waves, this is expert territory only. It’ll be a bit messy, but the wind stays clean.

Into the second week, from around July 10th, we drop back to smaller 3ft – 4ft east swell with light winds. Consistent and clean, but nothing epic.

Your two real targets: Monday July 6th morning is the undisputed champion. That 3ft south groundswell with the massive 17-second period and clean conditions is going to be perfection. Expect a few people out.

And in the second week, Tuesday July 14th morning is a real gem. A glassy, dead-calm 3ft west swell with a 16-second period. The combined energy is solid, and the wind is glass. If you see that on the forecast, do what you gotta do to get out there. That’s a special morning.

First week has the best quality. Second week is more of a pick-and-choose, but that one Tuesday morning is a gold star.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Fri afternoon, min 23°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light.

Fri
3
Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
2
0
3
3
3
3
3
1
3
2
1
3
3
2
3
2
2
2
2
2
2
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)
0.6
SSW
17
0.5
SSW
16
0.7
S
21
0.7
S
20
0.8
SSW
19
0.8
SSW
18
0.9
SSW
18
0.8
SSW
16
0.9
SSW
16
0.9
SSW
15
0.8
SSW
15
1.8
E
8
1.6
E
8
1.8
E
7
1.7
E
8
1.7
E
7
1.5
E
7
1.5
E
7
1.7
E
7
1.4
E
7
1.3
E
7
Wave Graph
Metric surfscale
Energy kJ
216
147
445
380
492
418
510
350
421
380
284
367
302
349
320
306
246
239
254
187
168
Wind (km/h)
10
ENE
15
ENE
10
E
10
E
15
ENE
10
ENE
15
ENE
15
ENE
10
ENE
15
ENE
15
ENE
10
ENE
15
ENE
15
ENE
10
ENE
10
ENE
15
ENE
10
E
10
ENE
10
ENE
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
cross-off
High Tide
6:25PM0.51m
6:41AM0.19m
6:54PM0.47m
7:56AM0.23m
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
Low Tide
1:51AM0.09m
11:37AM0.08m
2:19AM0.08m
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
part cloud
part cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
6:00
6:00
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
7:25
7:25
7:24
7:24
 mm
Temp °C
26
25
26
26
25
25
26
25
26
26
25
26
26
25
26
26
25
26
26
25
26
Feels °C
27
26
27
27
26
25
26
25
26
26
24
26
26
24
27
26
26
27
26
26
27
Swell 1
Height (m)
Direction
Period (s)
0.7
NE
8
0.8
NNE
8
0.8
NE
8
0.7
S
20
0.8
SSW
19
0.8
SSW
18
0.9
SSW
18
0.8
SSW
16
0.9
SSW
16
0.9
SSW
15
0.8
SSW
15
0.9
SSW
14
0.8
SSW
14
0.8
SSW
14
0.8
S
14
0.7
NE
7
0.7
NNE
7
0.8
NNE
7
0.7
NNE
7
0.7
NE
7
0.5
S
12
Energy kJ
57
78
69
380
492
418
510
350
421
380
284
350
273
265
236
56
55
62
42
50
69
Swell 2
Height (m)
Direction
Period (s)
0.6
SSW
17
0.5
NW
12
0.7
S
21
0.7
NE
8
0.7
NE
8
0.9
NE
8
0.7
NE
7
0.9
NE
7
0.9
NE
8
0.9
NNE
8
0.8
NNE
7
0.8
NNE
7
0.8
NNE
7
0.7
NE
7
0.7
NE
7
0.7
S
13
0.7
S
13
0.6
S
12
0.6
S
12
0.6
SE
7
0.5
N
6
Energy kJ
216
72
445
62
57
82
56
79
82
103
70
68
70
50
54
176
168
112
108
34
19
Swell 3
Height (m)
Direction
Period (s)
0.5
NW
12
0.5
SSW
16
0.5
SSW
16
0.5
SSW
15
0.5
SSW
15
0.5
SSW
14
0.4
SE
6
0.4
SE
9
0.5
SE
9
0.6
SE
9
0.4
SE
9
0.4
SE
6
0.4
SE
8
0.5
SE
8
0.4
SE
8
0.4
SE
6
0.5
SE
8
0.5
SE
8
0.6
SE
6
0.5
S
12
0.4
SE
8
Energy kJ
77
147
140
126
121
118
9
30
40
50
26
12
24
34
25
12
32
33
24
75
23
Wind waves
Height (m)
Direction
Period (s)
1.4
ENE
8
1.4
ENE
8
1.4
ENE
8
1.4
ENE
7
1.4
ENE
7
1.6
ENE
7
1.6
E
7
1.6
E
7
1.7
E
8
1.8
E
7
1.7
ENE
7
1.8
E
8
1.6
E
8
1.8
E
7
1.7
E
8
1.7
E
7
1.5
E
7
1.5
E
7
1.7
E
7
1.4
E
7
1.3
E
7
Energy kJ
238
232
232
220
208
259
233
255
341
348
327
367
302
349
320
306
246
239
254
187
168
Nearest Offshore or Glassy
Rating
(10 max)
2
1
3
3
3
3
3
2
3
3
2
3
3
3
3
2
2
2
2
2
2
Distance (km)
0
6
0
0
0
0
0
6
0
6
3
0
0
6
0
0
0
0
0
0
0
Best forecast wave conditions in Kaua'i
Rating
(10 max)
2
2
3
3
3
3
3
2
3
3
2
3
3
3
3
3
2
2
2
2
2
Best forecast wave conditions in United States
Rating
(10 max)
2
3
3
3
3
3
3
3
3
3
4
3
3
4
3
3
4
3
2
4
3
Header Global
Rating
(10 max)
7
5
5
5
9
7
7
5
8
7
5
6
9
8
9
8
5
5
5
4
9
  • Map Icons:
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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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