Rivermouth_Wailuku Surf Break

Lat Long: 20.91° N 156.49° W

Rivermouth_Wailuku Surf Forecast and Surf Report

Issued: 7 am 20 Jul 2026 (local time)

Forecast update in  hr  min

Today's Rivermouth_Wailuku sea temperature is
26.4° C
0.3° 

Rivermouth_Wailuku surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Rivermouth_Wailuku surf forecast from 20 Jul 2026:

  • Most powerful swell: Monday 27 Jul, 8AM (local time) - 6ft (1.8m), 15s period, E swell with 1,354 kJ wave energy.

Best Forecast Surf Conditions for Rivermouth_Wailuku this week:

The most powerful waves expected at Rivermouth_Wailuku in the next 16 days are 1.8m 15s and forecast to arrive on Monday (Jul 27) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 19s period and expected on Thursday (Jul 23) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8AM (Mon 27th Jul)6ft (1.8m) 15s

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


The Lowdown

G’day, Rusty here. Look, I’ll be straight with you – this 16-day run for Rivermouth_Wailuku is a tough one. The whole stretch is a bit of a grind, with a lot of poor surf conditions and cross-onshore winds that just won’t let up. The water temp is sitting at 80°F, which is about average for this time of year, so that’s one thing we don’t have to worry about.

The first real chance of anything even worth paddling out for doesn’t show up until Monday, July 27th. That’s a solid week of waiting. From the 20th through to the 26th, it’s all poor surf with that constant ENE to NE cross-onshore wind messing things up. The swell is small, mostly around 3ft to 6ft, with short periods of 7 to 8 seconds – just windswell, no power behind it. The combined energy is weak to moderate (177 to 949), but it doesn’t matter because the wind is ruining any chance of a clean face.

Then on Monday, July 27th, the wind finally shifts to an onshore direction, but it’s not offshore – it’s just “on.” The swell starts to pick up a bit, with a 6ft to 6ft swell from the east, and the period jumps to 14 seconds, which is proper groundswell. The combined energy rockets up to 1521 to 1688, so there’s plenty of juice in the water. But the guidance says it’s marginal – questionable tide conditions. This is a reef break, so that long period east swell will wrap in nicely, but those tide issues could make it a bit of a puzzle. The wind is light from the NE at 9 mph, so it’s not perfect, but it’s a big step up from the mess of the first week.

The standout window is Wednesday, July 29th. That morning, the swell is 7ft from the ENE with a 12-second period, and the wind is a light NNE breeze at just 3 mph – that’s as close to glassy as you’ll get. The combined energy is a strong 1364. This is the best on offer. It’s a solid size, too big for beginners at over 5ft, but for experienced surfers, that reef setup should handle the long-period swell well. The only caveat is that this break is fairly consistent, but crowds are often here, so don’t expect to have it to yourself.

After that, the quality drops off again. From Thursday, July 30th, it’s back to cross-onshore winds and poor surf conditions, with the swell dropping and the period shortening. The second week looks like a write-off – consistent ENE winds and choppy, weak surf. If you’re keen, aim for that Wednesday the 29th and get it while it’s clean.

Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Tue afternoon. Warm (max 26°C on Mon morning, min 24°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Some drizzle, heaviest during Sat afternoon. Warm (max 26°C on Thu morning, min 24°C on Thu night). Wind will be generally light.

Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
E
8
1.3
ENE
7
0.9
NE
7
1.2
ENE
7
1.3
ENE
7
1.3
ENE
7
1.2
ENE
7
1.5
ENE
12
1.5
ENE
12
1.6
ENE
11
1.7
ENE
7
1.5
ENE
7
1.7
ENE
7
1.8
ENE
7
1.8
ENE
8
1.7
ENE
8
1
E
16
1.4
E
16
1.5
E
16
1.6
E
16
1.7
E
15
Wave Graph
Metric surfscale
Energy kJ
111
193
67
136
162
158
132
559
579
593
247
200
273
353
353
322
515
1046
1115
1222
1292
Wind (km/h)
15
NE
20
ENE
15
ENE
15
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
ENE
20
E
20
ENE
25
ENE
20
ENE
15
ENE
25
NE
20
ENE
20
ENE
20
NE
15
ENE
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
High Tide
6:01PM0.55m
10:04AM0.50m
5:44PM0.49m
11:40AM0.58m
12:27PM0.64m
1:01PM0.69m
1:30PM0.73m
11:19PM0.34m
1:58PM0.77m
00:18AM0.37m
Low Tide
12:18PM0.37m
1:38AM0.12m
2:16PM0.46m
2:25AM0.11m
3:23AM0.09m
4:25AM0.06m
5:21AM0.03m
8:39PM0.32m
6:07AM-0.01m
8:45PM0.30m
part cloud
part cloud
part cloud
part cloud
rain showers
part cloud
part cloud
clear
rain showers
part cloud
clear
clear
clear
clear
clear
clear
rain showers
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:54
5:56
5:56
5:56
5:56
5:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:08
7:07
7:07
7:07
7:07
7:07
7:07
 mm
2
1
1
Temp °C
26
26
26
26
26
25
26
26
25
26
26
25
26
26
24
26
25
24
26
26
24
Feels °C
26
26
27
27
26
25
26
26
25
25
25
24
25
25
23
27
24
23
26
26
23
  • 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 Rivermouth_Wailuku Surf forecast

The above surf forecast table for Rivermouth_Wailuku provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Rivermouth_Wailuku can be found by selecting the local surf guide option on the grey menu. Our Rivermouth_Wailuku 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 (Rivermouth_Wailuku) 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 Rivermouth_Wailuku 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.

Rivermouth_Wailuku is 4 km (2 miles) from Wailuku. If you plan a vacation in Maui, look for hotels and other accommodation in Wailuku. Wailuku has rooms for a wide range of budgets as well as car hire and transport links.

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