
Surf Forecasts:
Rivermouth_Wailuku surf forecast from 12 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 15ft (4.5m), 11s period, E swell with 5,148 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 4.5m 11s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 11s period and expected on Tuesday (Aug 11) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 15ft (4.5m) 11s |
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 cookin’ for the Rivermouth_Wailuku stretch over the next couple of weeks. I’ll be straight with you – this is a tough one.
First thing you gotta know: the water’s sittin’ at about 80°F right now, which is bang on average for this time of year. Nothing weird goin’ on there.
The overall pattern is a long, drawn-out stretch of onshore wind and messy conditions. We’re lookin’ at a solid 12-day gap with no real surf on offer from the start of the period. From Tuesday the 11th of August right through to the morning of Saturday the 16th, it’s a write-off – cross-onshore winds, short-period windswell, and a whole lot of chop. The waves are there, but they’re ugly. The combined energy is weak to moderate early on (192 on the 11th), then builds into a strong pulse (2109 on the 15th), but the wind just ruins it. That 10ft swell on Saturday afternoon the 15th is big, but with a strong cross-onshore breeze at 25 mph and a messy sea state, it’s a real washing machine. Not worth paddlin’ out unless you’re a kite surfer lookin’ for a tow.
Now, hold on. Late afternoon on Sunday the 16th of August, things finally flip. We get a clean window with a gentle cross-offshore breeze, 12ft swell from the ENE, and a period of 10 seconds. The combined energy is a solid 2452 – that’s strong wave energy. The surf report calls it “excellent surf conditions for experienced surfers.” This is a standout session, but it’s a short window. That size is serious – 12ft is only for the crew with some chops. The 10-second period means it’ll have some punch, but it won’t be too drawn out. Still, the wind is clean, and the Rivermouth_Wailuku reef can handle that direction. Pay attention to the crowd situation, though – this spot is often busy, so expect company.
After that one golden moment, it’s back to the grind. Monday morning the 17th through to the end of the forecast on the 26th, it’s all moderate cross-onshore winds again, with swell hovering between 3ft and 5ft, short periods (6 to 8 seconds), and weak to moderate energy (mostly under 400). The surf is consistently rated as poor. Wednesday the 26th still looks the same – no real change.
So, the bottom line: this forecast is a bummer for the most part. The only real shot you’ve got is that Sunday afternoon (16th August) window. If you’re an experienced surfer and you can get out there, it’ll be worth it. For everyone else, it’s a long wait for not much.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 114mm), heaviest during Sat night. Warm (max 27°C on Sun morning, min 25°C on Fri night). Winds decreasing (near gales from the ENE on Sat night, light winds from the E by Sun night). | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||
Wave Height (m) Direction Period (s) | E 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 11 | E 12 | ENE 11 | E 11 | ENE 9 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||
163 | 163 | 168 | 158 | 195 | 220 | 353 | 530 | 1111 | 1857 | 2081 | 2077 | 1914 | 2267 | 828 | 509 | 356 | 259 | 199 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | cross | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 5:39AM0.56m | 4:37PM0.58m | |||||||
Low Tide | 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 | 11:04AM0.32m | 11:30PM0.11m | ||||||
— | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | |
6:58 | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | 5 | 4 | 5 | 83 | 4 | 7 | 4 | 1 | 1 | — |
Temp °C | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 25 |
Feels °C | 25 | 26 | 27 | 26 | 27 | 26 | 26 | 27 | 27 | 24 | 24 | 23 | 21 | 29 | 29 | 29 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | NNW 7 | NNW 7 | W 13 | W 12 | W 12 | NNW 9 | NNW 8 | NNW 7 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 9 | W 12 | W 12 | W 11 | W 11 | W 11 | W 11 |
5 | 5 | 12 | 11 | 11 | 7 | 6 | 5 | 6 | 6 | 6 | 6 | 8 | 11 | 11 | 10 | 10 | 10 | 10 | |
Swell 2 Height (m) Direction Period (s) | W 10 | W 10 | NW 7 | NW 7 | NW 9 | W 12 | W 12 | W 12 | W 12 | W 11 | W 11 | W 11 | W 13 | NNW 8 | N 8 | N 8 | N 8 | N 8 | N 7 |
9 | 8 | 2 | 2 | 3 | 11 | 11 | 11 | 11 | 10 | 9 | 10 | 13 | 7 | 6 | 5 | 5 | 1 | 1 | |
Swell 3 Height (m) Direction Period (s) | SW 14 | W 13 | SW 18 | SW 16 | NW 7 | SW 17 | NE 11 | SW 15 | S 14 | SW 17 | S 14 | — | SW 16 | SW 19 | S 13 | SW 17 | W 18 | SW 19 | W 15 |
7 | 3 | 12 | 11 | 2 | 11 | 4 | 8 | 4 | 12 | 4 | — | 10 | 14 | 3 | 12 | 6 | 14 | 4 | |
Wind waves Height (m) Direction Period (s) | E 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 11 | E 12 | ENE 11 | E 11 | ENE 9 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
163 | 163 | 168 | 158 | 195 | 220 | 353 | 530 | 1111 | 1857 | 2081 | 2077 | 1914 | 2267 | 828 | 509 | 356 | 259 | 199 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 14 | 14 | 20 | 14 | 14 | 20 | 20 | 14 | 20 | 144 | 151 | 151 | 96 | 5 | 2 | 5 | 14 | 14 | 20 |
Best forecast wave conditions in Maui | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











