Waimea Rivermouth Surf Break

Lat Long: 21.95° N 159.67° W

Waimea Rivermouth Surf Forecast and Surf Report

Issued: 7 am 18 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: Saturday 25 Jul, 8AM (local time) - 3ft (0.9m), 20s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Saturday 25 Jul, 8AM (local time) - 3ft (0.9m), 20s period, SSW swell with 634 kJ wave energy.
  • Next surfable swell (1★+): Saturday 18 Jul, 5PM (local time) - 6.5ft (2.0m), 6s 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 Saturday (Jul 18) at 5PM. The primary swell is predicted to be 2.0m and 6s period with a secondary swell of 0.6m and 14s. Another secondary swell of 0.6m and 6s is also forecast. 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 20s and forecast to arrive on Saturday (Jul 25) at 8AM. 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 Wednesday (Jul 22) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Sat 18th Jul)6.5ft (2.0m) 6s
Best Surf 8AM (Sat 25th Jul)3ft (0.9m) 20s
Most Powerful 8AM (Sat 25th Jul)3ft (0.9m) 20s

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


The Lowdown

Alright, Rusty here, let's run through what's coming up for the next couple of weeks.

Right from the start, we’ve got a solid run of surfable days ahead. The water temperature’s sitting at 80°, which is about normal for this time of year, nothing unusual there. The winds are looking clean through a lot of the period, with that cross-off or glassy setup showing up often.

The real standout is Saturday, July 25th. The morning session at Waimea Rivermouth is the one to circle. You’ve got an SSW swell running around 3 ft at a long 19 seconds, with clean cross-off winds from the east. The combined wave energy hits a strong 1032, so there’s real power in the water. That long period will wrap into the river mouth and give you some proper shape. Crowds can show up here, so plan accordingly.

Before that, the week prior stays active. Saturday afternoon July 18th bumps to 7 ft from the east with a short 6-second period—bit wind-affected, but it gets things moving. Sunday the 19th and Monday the 20th settle to around 4 ft to 4 ft from the east, with 8-second period, and nice cross-off or glassy winds. The energy sits in the 300s, so moderate but clean.

Tuesday the 21st through Thursday the 24th keeps the rhythm: SSW swells around 2 ft to 3 ft, with periods stretching from 14 up to 20 seconds. The winds stay favourable, mostly east or east-northeast at 6-9 mph, cross-off, keeping things clean. The combined energy climbs through the 800s toward the end of the week, so those morning sessions on Wednesday and Thursday are well worth the paddle out.

After Saturday the 25th peaks, Sunday the 26th and Monday the 27th are still very good. Swell drops to around 3 ft to 3 ft from the SSW, periods 15 to 16 seconds. Winds stay light, with some glassy spells, especially Monday afternoon.

Then we hit a slow patch. Tuesday the 28th drops off—surf down to 2 ft, weak energy in the 100s, and a messy cross-shore wind. That sets up a quiet stretch. There’s a spike on Wednesday July 29th morning—a massive 10 ft east swell with 14-second period and 3754 energy—but that’s too big for this break and only for experts. The afternoon calms down.

From there, Thursday the 30th is tiny but glassy, not much going on. Friday the 31st morning is marginal, but the afternoon brings back a clean 7 ft east swell with glassy conditions and energy at 772—worth a look. Into August, Saturday the 1st holds 6 ft to 7 ft from the east, short period around 7-8 seconds but clean. Sunday the 2nd eases to 4 ft, still clean with east-northeast winds, a decent end to the run.

If you only get one session in, make it Saturday July 25th morning. The week before is a steady build of quality, and the first weekend of August still has some energy, even if the period’s shorter.

Rusty out.

Short Range Forecast

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

Days 4-6 Weather Summary

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

Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
3
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
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)
0.6
SSW
14
2
E
6
1.4
E
8
1.3
E
8
1.3
E
8
1.1
E
8
1.1
E
8
0.5
S
16
1.1
E
7
0.8
S
15
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
0.7
SSW
18
0.7
SSW
18
0.8
SSW
17
1.7
E
8
Wave Graph
Metric surfscale
Energy kJ
149
335
235
219
208
149
153
134
127
271
257
273
315
429
366
416
399
344
326
340
320
Wind (km/h)
10
E
10
E
15
ENE
5
NE
10
ENE
10
ENE
5
E
5
ENE
10
NE
5
E
10
ENE
15
ENE
10
E
5
E
15
ENE
10
E
10
E
15
ENE
10
ENE
10
ENE
15
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
glassy
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
6:57PM0.45m
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
Low Tide
12:16PM0.13m
2:04AM0.06m
1:25PM0.22m
2:37AM0.06m
3:25PM0.28m
3:13AM0.05m
3:56AM0.05m
4:46AM0.04m
5:39AM0.03m
10:22PM0.16m
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
rain showers
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:05
6:05
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:22
7:22
7:22
7:22
7:22
 mm
1
Temp °C
27
27
25
26
26
25
26
26
25
27
27
25
26
26
25
26
26
25
26
27
25
Feels °C
28
29
26
27
27
26
27
27
27
28
28
27
27
27
25
27
27
25
26
27
25
  • 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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