Rivermouth_Wailuku Surf Break

Lat Long: 20.91° N 156.49° W

Rivermouth_Wailuku Surf Forecast and Surf Report

Issued: 1 pm 18 Jul 2026 (local time)

Forecast update in  hr  min

Today's Rivermouth_Wailuku sea temperature is
26.3° 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 19 Jul 2026:

  • Most powerful swell: Thursday 23 Jul, 11AM (local time) - 5ft (1.6m), 11s period, ENE swell with 615 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 11s and forecast to arrive on Thursday (Jul 23) at 11AM. 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 Powerful11AM (Thu 23rd Jul)5ft (1.6m) 11s

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


The Lowdown

Alright, this is Rusty. Let's have a look at the Rivermouth_Wailuku forecast.

To be straight up with you, the next week or so looks pretty average. The wind is locked in from the east, blowing cross-onshore almost every single day. That’s going to keep the surface choppy and messy. We’ve got a consistent run of small to moderate swell, around 4 to 6ft, mostly from the ENE, but that onshore breeze kills it. The water temp is sitting at about 79°, which is pretty much bang on normal for this time of year, so no surprises there.

For the first few days, from Saturday the 18th through to Friday the 24th of July, it’s just a grind of poor surf. The combined swell energy bounces around between 177 and 625 (moderate), but it doesn't matter because the wind is ruining it. Don’t bother paddling out expecting anything clean.

Then we get a bit of a shift heading into the weekend of the 26th of July. The swell picks up, and more importantly, the period jumps to 16 seconds. That’s a long-period groundswell, and it brings some real energy with it – we’re talking 1130 to 1343 (strong to very strong). The swell height sits around 4 to 5ft. Now, the caveat here is that with that long 16-second period, it might break a bit too straight at a beach setup, but Rivermouth_Wailuku is a reef break. That is what you want. It should produce better shaped, more powerful waves.

The downside? The wind is still cross-onshore, so it’s never going to be glassy. The forecasts call it "marginal" or a 1 or 2 out of 10, which is the best we get here. The swell direction is from the East, which isn't the ideal NNE direction, but with that much energy, it’ll still be the best on offer. For a standout, I’d aim for the 27th of July, Monday morning and afternoon. The swell is 5ft, period 14 seconds, and the wind drops to a gentle breeze (9 mph). It’s still cross-onshore, but lighter wind means less chop. The combined energy is 1177 and 1123 (strong). This is about as good as it gets in this window.

After that, it fades again. By the 29th of July, the period drops back to 11-12 seconds, and the swell drops under 4ft. The wind stays cross-onshore. It’s back to the poor conditions we started with. That run of poor surf looks like it will stretch all the way to the end of the forecast on the 2nd of August.

So, here’s the call: the window from Saturday the 26th to Monday the 28th of July is the only one that really has any juice. It won't be perfect, but for a reef break seeing that kind of long-period energy, it's your best bet if you can handle a bit of chop. Keep in mind that it's often crowded here, so expect company.

Rusty.

Short Range Forecast

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

Days 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Tue afternoon. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light.

Sat
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
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)
1.8
ENE
8
1.4
E
8
1.3
ENE
8
1.3
ENE
8
1
E
8
1.3
ENE
7
1.3
ENE
7
1.2
ENE
7
1.2
ENE
7
1.3
ENE
7
1.3
ENE
7
1.1
ENE
7
1.4
ENE
7
0.8
E
12
1.6
ENE
11
1.6
ENE
7
1.6
ENE
7
1.6
ENE
7
1.9
ENE
7
1.8
ENE
8
Wave Graph
Metric surfscale
Energy kJ
394
264
229
229
124
193
164
140
128
149
158
123
176
184
615
214
227
273
369
373
Wind (km/h)
20
ENE
20
ENE
15
ENE
20
NE
15
ENE
15
ENE
20
NE
15
ENE
15
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
20
E
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
5:32PM0.71m
6:19AM0.44m
5:51PM0.62m
7:53AM0.45m
6:01PM0.55m
10:04AM0.50m
5:44PM0.49m
11:40AM0.58m
12:27PM0.64m
1:01PM0.69m
Low Tide
00:26AM0.16m
11:26AM0.26m
1:00AM0.14m
12:18PM0.37m
1:38AM0.12m
2:16PM0.46m
2:25AM0.11m
3:23AM0.09m
4:25AM0.06m
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
rain showers
clear
clear
clear
clear
part cloud
clear
rain showers
rain showers
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:54
5:54
5:56
5:56
5:56
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:08
7:08
7:08
7:07
7:07
7:07
7:07
 mm
1
1
1
Temp °C
27
25
26
26
25
26
26
25
26
26
25
26
26
24
26
27
25
26
26
25
Feels °C
26
25
25
26
24
27
27
25
27
26
25
26
26
23
25
26
24
25
25
24
  • 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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