Rivermouth_Wailuku Surf Break

Lat Long: 20.91° N 156.49° W

Rivermouth_Wailuku Surf Forecast and Surf Report

Issued: 1 pm 08 Aug 2026 (local time)

Forecast update in  hr  min

Today's Rivermouth_Wailuku sea temperature is
26.5° C
0.1° 

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 9 Aug 2026:

  • Most powerful swell: Saturday 15 Aug, 8PM (local time) - 10ft (3.0m), 9s period, ENE swell with 1,431 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 3.0m 9s and forecast to arrive on Saturday (Aug 15) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 18s period and expected on Saturday (Aug 08) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8PM (Sat 15th Aug)10ft (3.0m) 9s

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


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s on offer for the next couple of weeks at Rivermouth_Wailuku. I gotta be straight with you – this stretch is looking pretty bleak. The whole 16-day window is a tough one, and there’s not a single day I’d call a standout. The first real surf we see is from Saturday the 8th of August, but it’s not good news.

The pattern is stubbornly locked in. A persistent ENE swell is running, but the wind is a constant problem. From Saturday the 8th right through to the end of the forecast, we’re dealing with cross-onshore and onshore winds. This means the surface is going to be choppy and messy, not the clean lines we want. The water temp is sitting at 80°F, which is bang on average for this time of year.

Right from the start, Saturday the 8th brings a 5ft ENE swell with a short period of 7 seconds and combined energy of 189 – weak, wind-chop stuff. The wind is a 12 mph cross-on from the NE. It’s just poor. Sunday the 9th is a little bigger at 5ft to 5ft, but the wind picks up to 16 mph in the afternoon with rain showers, making it even worse. This same story just repeats: Monday the 10th, Tuesday the 11th, all the way through the week. Swell hangs around 4ft to 5ft, always ENE, always short period (6 to 8 seconds), and always cross-onshore winds. The combined energy stays in the low to mid 100s and 200s – weak.

Towards the end of the first week, things actually get a bit more size, but that makes it worse. Friday the 14th sees the swell bump up to 7ft in the morning and 8ft in the afternoon, with energy climbing to 595 (moderate). But the wind is a fresh 16 mph cross-on from the NE, and the period is still short at 7 seconds. It’s just a big, messy, onshore mess.

The second week kicks off with a pulse. Saturday the 15th of August has a 10ft swell from the ENE with a period of 8 to 9 seconds and combined energy hitting 1083 in the morning and 1298 in the afternoon – that’s strong wave energy. But the wind is howling at 22 to 25 mph from the NE, with a risk of thunderstorms. This is a dangerous setup, well over the 8ft mark, so experts only, and even then, with that wind it’s going to be a washing machine. Sunday the 16th is a slight shift: the wind swings to the S and SSE at 25 mph, becoming cross-offshore, cleaning it up a bit. The swell is still 10ft in the morning dropping to 8ft, and energy is 1162 and 819. The conditions are described as “clean” but the rating is still just a marginal 1/10. It’s the closest thing to a window, but with that wind strength, it’s more of a challenge than a pleasure.

From Monday the 17th onwards, we fade back down. Swell drops to 6ft and then 6ft, with energy dropping into the 300s and 400s. The wind stays cross-onshore from the ENE and NE, 6 to 12 mph. The rest of the week, from the 18th through to the 23rd of August, is all the same: swell between 4ft and 5ft, short period (6-8 seconds), weak energy (200-330), and constant cross-onshore or cross-shore wind. It’s all poor.

Honestly, there’s nothing here to get excited about. The winds are relentless, the swell is short-period and onshore, and the quality never shows up. With this persistent cross-onshore wind and a beach-and-reef setup, this looks more interesting for kite surfing than paddle surfing. We’ll have to wait for a change in the pattern. Keep an eye on it, but don’t hold your breath.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Sun afternoon. Warm (max 28°C on Sat afternoon, min 25°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 28°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light.

Sat
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
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
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
ENE
7
1.4
ENE
7
1.5
ENE
8
1.6
ENE
8
1.6
ENE
8
1.6
ENE
8
1.5
ENE
8
1.4
ENE
8
1.3
ENE
7
1.4
ENE
7
1.2
ENE
7
1.3
ENE
7
1.4
ENE
6
1.5
ENE
6
1.6
ENE
6
1.7
ENE
7
1.8
ENE
7
2.1
ENE
7
2.4
ENE
7
2.4
ENE
8
Wave Graph
Metric surfscale
Energy kJ
186
186
234
328
324
273
240
204
191
199
160
158
149
170
201
262
310
468
595
763
Wind (km/h)
20
ENE
20
ENE
20
ENE
25
NE
15
ENE
20
ENE
20
ENE
15
ENE
15
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
NE
20
ENE
25
ENE
25
ENE
25
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
High Tide
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
3:25PM0.87m
3:13AM0.55m
3:50PM0.81m
3:59AM0.57m
Low Tide
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
8:31AM-0.06m
9:51PM0.16m
9:10AM0.02m
10:16PM0.13m
clear
clear
part cloud
rain showers
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:03
6:03
6:03
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
6:59
6:59
6:58
6:57
6:57
6:55
 mm
1
1
3
Temp °C
28
26
27
26
26
27
27
26
27
27
25
27
27
25
27
28
26
27
27
26
Feels °C
29
27
29
27
27
28
27
27
28
27
25
27
27
25
27
28
26
26
26
26
  • 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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