Rivermouth_Wailuku Surf Break

Lat Long: 20.91° N 156.49° W

Rivermouth_Wailuku Surf Forecast and Surf Report

Issued: 7 am 10 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 10 Aug 2026:

  • Best quality surf: Sunday 16 Aug, 8PM (local time) - 7.5ft (2.3m), 11s period, ENE swell with offshore winds.
  • Most powerful swell: Sunday 16 Aug, 5PM (local time) - 8ft (2.4m), 11s period, ENE swell with 1,322 kJ wave energy.
  • Next surfable swell (1★+): Sunday 16 Aug, 8PM (local time) - 7.5ft (2.3m), 11s period with ENE swell.

Best Forecast Surf Conditions for Rivermouth_Wailuku this week:

The surf forecast for Rivermouth_Wailuku over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 16) at 8PM. The primary swell is predicted to be 2.3m and 11s period with a secondary swell of 0.2m and 8s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Rivermouth_Wailuku in the next 16 days are 2.4m 11s and forecast to arrive on Sunday (Aug 16) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Sunday (Aug 16) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Sun 16th Aug)7.5ft (2.3m) 11s
Best Surf 8PM (Sun 16th Aug)7.5ft (2.3m) 11s
Most Powerful 5PM (Sun 16th Aug)8ft (2.4m) 11s

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


The Lowdown

Alright folks, it’s Rusty here, and I’ve been staring at this forecast for the Wailuku River mouth. Let’s be honest from the start: this is a tough stretch for surfers around here. The whole 16-day window is pretty much a write-off, with no real standout sessions to get excited about.

We’re looking at Rivermouth_Wailuku, a reef break that’s fairly consistent but craves an offshore wind from the SSW. Unfortunately, the trade winds are locked in from the ENE and NE, blowing cross-on shore for the entire first week and beyond. The water temp is sitting at 80°F, which is about normal for this time of year, so we can’t even blame the cold for the lack of quality.

We start off from Monday, 10 August, with a small 4ft swell from the ENE, but with a short period of 8 seconds and a cross-on breeze, it’s just choppy and weak. The combined energy is a meagre 229 (weak). Tuesday and Wednesday are more of the same – 4ft to 5ft, still short-period, still cross-on. Honestly, it’s frustrating.

The swell builds a little heading into the weekend of 15-16 August, hitting 7ft to 8ft from the ENE, and the period stretches to 10-11 seconds. The energy jumps up – on Sunday, 16 August, we see 1115 (strong) in the morning and 1328 (very strong) in the afternoon. But here’s the kicker: the wind swings around to the south, giving a clean, cross-off breeze. That’s the only window that looks marginally interesting. The morning is risky with a chance of thunderstorms, and the score is low, but by Sunday afternoon the wind is moderate and the surf is listed as clean. Still, the swell direction is ENE, while this break works best with a NNE swell, so the waves won’t be lined up properly. It’s a tease, and for a spot that’s a river mouth, those long-period (11 sec) ENE swells break too straight, so it’s more for the experienced crew taking a gamble.

The following week, from Monday, 18 August, through to the end of the forecast on 25 August, we’re back to small, weak, short-period chop. The swell drops to 3ft to 4ft, periods are 5-8 seconds, and the energy is weak (72 to 331). The cross-on trades are relentless. There’s nothing to recommend here.

If you’re a hardcore local, that Sunday, 16 August, afternoon might be your only chance to get wet, but it’s a gamble. For everyone else, it’s time to check the kite gear, because with that onshore wind and building swell, the setup looks far more interesting for kite surfing than paddle surfing. The forecast can always change, but for now, it’s a long blank run.

Rusty.

Short Range Forecast

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

Days 4-6 Weather Summary

Heavy rain (total 87mm), heaviest during Sat night. Warm (max 27°C on Thu morning, min 24°C on Thu night). Winds increasing (light winds from the ENE on Thu morning, strong winds from the NNW by Sat night).

Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
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
2
2
3
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
ENE
8
1.5
ENE
8
1.3
ENE
8
1.3
ENE
7
1.2
ENE
7
1.1
E
8
1.3
ENE
7
1.4
ENE
7
1.4
ENE
6
1.5
ENE
7
1.6
ENE
7
1.6
ENE
8
1.7
ENE
8
1.8
ENE
9
2
ENE
9
2
ENE
10
2.1
ENE
10
2.1
ENE
10
2.3
ENE
10
2.4
ENE
11
2.3
ENE
10
Wave Graph
Metric surfscale
Energy kJ
202
246
196
186
164
138
163
173
144
204
261
306
389
455
627
732
828
872
1109
1322
1152
Wind (km/h)
20
ENE
20
ENE
15
E
15
ENE
20
ENE
15
ENE
20
ENE
20
NE
20
ENE
20
ENE
25
NE
25
ENE
25
ENE
25
NE
25
NE
30
NE
40
N
35
SSW
30
S
20
S
10
S
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
on
on
off
cross-off
cross-off
off
High Tide
1:52PM0.90m
00:51AM0.42m
2:25PM0.92m
1:42AM0.48m
2:56PM0.91m
2:28AM0.52m
3:25PM0.87m
3:13AM0.55m
3:50PM0.81m
3:59AM0.57m
4:12PM0.73m
4:46AM0.57m
4:28PM0.65m
Low Tide
8:41PM0.26m
7:05AM-0.11m
9:02PM0.23m
7:50AM-0.10m
9:26PM0.19m
8:31AM-0.06m
9:51PM0.16m
9:10AM0.02m
10:16PM0.13m
9:48AM0.11m
10:40PM0.12m
10:26AM0.22m
11:05PM0.11m
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
rain showers
rain showers
mod rain
rain showers
rain showers
thunderstorm
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:03
6:03
6:03
6:03
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:59
6:58
6:57
6:57
6:55
6:54
6:54
 mm
2
3
9
73
4
2
Temp °C
27
27
26
27
27
25
26
27
25
27
27
25
27
27
25
25
26
26
27
28
26
Feels °C
28
28
27
28
28
26
26
27
25
27
27
25
26
27
24
24
25
25
26
28
28
  • 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 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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