Rivermouth_Wailuku Surf Break

Lat Long: 20.91° N 156.49° W

Rivermouth_Wailuku Surf Forecast and Surf Report

Issued: 1 am 06 Aug 2026 (local time)

Forecast update in  hr  min

Today's Rivermouth_Wailuku sea temperature is
26.6° C
0.2° 

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 6 Aug 2026:

  • Most powerful swell: Sunday 9 Aug, 5PM (local time) - 5ft (1.6m), 8s period, ENE swell with 350 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 1.6m 8s and forecast to arrive on Sunday (Aug 09) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 11s period and expected on Thursday (Aug 06) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Sun 9th Aug)5ft (1.6m) 8s

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


The Lowdown

Right, folks, let’s get into it. The window’s lookin’ a bit grim for a while, I won’t lie to ya. The only break on the radar is Rivermouth_Wailuku, and it’s a reef setup that’s fairly consistent. But for the first week and a half, we’re staring down the barrel of a whole lot of nothin’ good. The wind is stubbornly out of the east-northeast, blowin’ cross-on, and the wave comment is “poor surf conditions” right through.

Water temp’s at 79.9°, which is about average for the time of year, so at least the water’s not gonna give you a shock.

We start off on Thursday, 6th August, with tiny waves. Morning swell is a pathetic 2.3ft from the ENE with a short 8-second period, and the combined energy is weak (103). The cross-on breeze makes it a choppy mess. It’s the same story for days: Thursday afternoon brings 3.6ft, Friday morning drops to 2.0ft, Friday afternoon pops up to 3.3ft but with a 5-second period that’s just noise. Saturday the 8th sees 3.9ft, and it slowly builds, but it’s all cross-on, all choppy. The energy stays moderate (170-218) but the quality is zero.

Sunday the 9th through Wednesday the 13th is a long, flat line of poor surf. Swell hovers between 3.6ft and 5.2ft, period is short (7-8 seconds), and the wind is relentless from the ENE. This is a stretch of days where you’re better off doin’ somethin’ else.

Now, we start to see a pulse pick up around Friday the 14th of August. The swell jumps to 6.2ft in the morning, then 6.6ft in the afternoon, with the combined energy ramping up to moderate/strong (339-407). But it’s still cross-on from the ENE, so it’s gonna be messy. Saturday the 15th is the biggest day of the whole run: 7.5ft-7.9ft from the ENE, period stretching to 9 seconds, and the energy gets strong (741-880). Sunday the 16th holds that size at 7.9ft (909 energy) and 7.5ft (855 energy). Still, all that power is matched with a cross-on wind, so it’s gonna be a washing machine. For a reef like Rivermouth_Wailuku, that’s a real shame. This is expert-only territory, and honestly, it looks more interesting for kite surfing than paddle surfing with that wind and chop.

Monday the 17th sees a slight drop to 6.9ft, still cross-on. The only glimmer comes on Tuesday the 18th of August morning. The swell is still 6.2ft from the ENE with an 8-second period, the energy is strong (522), and the wind finally eases to a gentle breeze from the NE. The comment shifts to “marginal surf forecast.” It’s the best we’ve got in the whole 16 days, but it’s a long shot. The break is a reef, and the swell direction is ENE while the optimum direction is NNE, so it’s not a perfect match. The crowds are “often” at this spot, so you won’t be alone.

After that, it fades back into poor conditions through the end of the window on the 21st of August.

So, the standout, if you can call it that, is that Tuesday the 18th morning session. It’s the only slot with a score of 1 out of 10 instead of a zero. The size is there, the energy is there, but the wind is finally light enough to maybe give you a few clean-ish walls. For the rest? It’s a long, frustrating stretch of cross-on chop. Don’t get your hopes up.

Short Range Forecast

Mostly dry. Warm (max 27°C on Fri morning, min 24°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Sun afternoon. Warm (max 27°C on Sun afternoon, min 24°C on Tue night). Wind will be generally light.

Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
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
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
ENE
8
1.1
ENE
8
0.5
ENE
7
0.6
ENE
7
1
ENE
5
1.2
ENE
7
1.2
ENE
7
1.5
ENE
7
1.6
ENE
7
1.6
ENE
8
1.6
ENE
8
1.4
ENE
8
1.4
ENE
8
1.3
ENE
8
1.4
ENE
7
1.2
ENE
7
1.3
ENE
7
1.2
ENE
7
1.1
ENE
7
1.1
ENE
7
0.9
E
8
Wave Graph
Metric surfscale
Energy kJ
56
131
31
34
58
135
143
215
238
324
350
251
210
196
220
164
186
151
121
118
90
Wind (km/h)
15
ENE
15
NE
15
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
E
15
E
15
ENE
20
ENE
20
ENE
15
ENE
20
ENE
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
10:35AM0.60m
11:51AM0.70m
12:37PM0.79m
10:03PM0.34m
1:16PM0.86m
11:50PM0.37m
1:52PM0.90m
00:51AM0.42m
2:25PM0.92m
1:42AM0.48m
2:56PM0.91m
2:28AM0.52m
Low Tide
2:47AM0.04m
4:09AM0.00m
8:44PM0.33m
5:19AM-0.05m
8:26PM0.30m
6:16AM-0.09m
8:41PM0.26m
7:05AM-0.11m
9:02PM0.23m
7:50AM-0.10m
9:26PM0.19m
part cloud
part cloud
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
thunderstorm
rain showers
clear
rain showers
rain showers
clear
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:01
6:03
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
7:00
7:00
6:59
6:59
6:58
6:57
 mm
2
1
1
2
Temp °C
26
26
25
27
26
26
27
27
26
26
27
26
27
27
26
27
27
25
27
27
26
Feels °C
28
27
26
28
27
27
27
27
27
27
29
27
28
29
28
28
27
25
28
27
27
  • 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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