Surf Forecasts:
Rivermouth_Wailuku surf forecast from 12 Aug 2026:
- Best quality surf: Sunday 16 Aug, 11PM (local time) - 7ft (2.1m), 8s period, ENE swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 15ft (4.5m), 10s period, ENE swell with 4,259 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 11PM (local time) - 7ft (2.1m), 8s 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 11PM. The primary swell is predicted to be 2.1m and 8s period with a secondary swell of 0.2m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Rivermouth_Wailuku in the next 16 days are 4.5m 10s and forecast to arrive on Sunday (Aug 16) at 2AM. 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 10s period and expected on Wednesday (Aug 12) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 16th Aug) | 7ft (2.1m) 8s |
| Best Surf | 11PM (Sun 16th Aug) | 7ft (2.1m) 8s |
| Most Powerful | 2AM (Sun 16th Aug) | 15ft (4.5m) 10s |
Table - best surf conditions forecast for Rivermouth_Wailuku over the next 16 days.
The Lowdown
Hey, Rusty here. Let’s break it down.
This full 16-day stretch at Rivermouth Wailuku is a tough one. There’s a persistent cross-onshore wind that just won’t let up, and the swell direction – every day coming from the east or east-northeast – is not what this reef break prefers, which is a northerly-northeast. The combined energy does spike big time in the middle of the run, but it’s always paired with strong winds and rain that trash the surface.
The single best window comes on Sunday afternoon, 16th August. The swell holds at 10ft from the east, with a short 8-second period – so it’s not a classic groundswell, but the wind finally shifts to a cross-offshore from the southeast at only 9 mph. That cleans the surface right up, and with a combined energy of 1960, there’s real power. It’s the only session in the whole forecast where it won’t be a choppy mess, and while the short period means dumpier takeoffs, it’s the clear highlight.
Before that, Saturday 15th August brings the biggest swell – 10ft to 12ft from the east and east-northeast, with periods up to 11 and 12 seconds – but the wind is howling cross-onshore at 22 to 25 mph with rain showers. The combined energy blasts up to 2218 and even 3122, but it’s so messy and windy it’s borderline unsurfable. That kind of power with that wind angle is more of a kite-surfing setup.
From Monday 17th August all the way to the 27th, it’s a long grind. Swell drops to small stuff – 3ft to 6ft – periods are short, mostly 6 to 8 seconds, and the combined energy stays weak to moderate, maxing out around 308. The wind stays cross-onshore from the east-northeast or east, keeping it choppy. Water temp is 80°, about normal for the season.
So if you’re itching for a paddle, Sunday afternoon, 16th August, is your one real chance at Rivermouth Wailuku. The rest of the run is a long stretch of poor conditions, with the wind and swell direction just not lining up. That’s how it goes sometimes.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri night. Warm (max 28°C on Thu afternoon, min 25°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 134mm), heaviest during Sun morning. Warm (max 27°C on Sat morning, min 24°C on Sat night). Winds decreasing (gales from the NE on Sat night, light winds from the SE by Sun night). | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
AM | PM | 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) | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | ENE 10 | ENE 11 | E 12 | ENE 10 | E 9 | E 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
163 | 176 | 153 | 206 | 240 | 353 | 439 | 559 | 1402 | 2211 | 3116 | 4259 | 1621 | 1112 | 511 | 346 | 268 | 199 | 188 | 163 | 149 | |
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-off | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 6:48AM0.54m | 4:30PM0.52m | ||||||||
Low Tide | 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 | 11:51AM0.42m | 11:59PM0.12m | ||||||||
6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | |
mm | — | — | — | — | — | — | — | — | 4 | 2 | 2 | 55 | 64 | 4 | 3 | 1 | 3 | — | — | — | — |
Temp °C | 27 | 27 | 26 | 27 | 28 | 26 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 27 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 28 | 27 | 27 | 27 | 28 | 26 | 26 | 26 | 24 | 25 | 24 | 22 | 26 | 28 | 29 | 28 | 27 | 26 | 26 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | NNW 7 | W 13 | W 12 | W 12 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | W 13 | W 12 | ENE 9 | W 11 | W 11 | W 11 | W 11 | W 11 | W 11 | W 12 |
5 | 12 | 11 | 11 | 7 | 6 | 6 | 6 | 6 | 7 | 6 | 14 | 11 | 841 | 10 | 10 | 9 | 10 | 9 | 9 | 11 | |
Swell 2 Height (m) Direction Period (s) | W 10 | NW 7 | NW 7 | NW 9 | W 12 | W 12 | W 12 | W 12 | W 11 | W 11 | W 11 | NW 9 | NNW 9 | W 12 | N 8 | N 8 | N 8 | N 7 | WSW 17 | WSW 18 | SW 18 |
8 | 2 | 2 | 3 | 11 | 11 | 11 | 11 | 10 | 9 | 10 | 3 | 8 | 11 | 5 | 1 | 1 | 1 | 28 | 30 | 12 | |
Swell 3 Height (m) Direction Period (s) | W 13 | SW 18 | SW 16 | N 7 | SW 16 | NE 11 | S 14 | S 14 | SW 17 | W 15 | — | W 10 | SW 19 | NNW 8 | SW 17 | W 18 | SW 6 | W 5 | W 13 | W 13 | N 7 |
3 | 12 | 11 | 1 | 10 | 4 | 4 | 4 | 12 | 4 | — | 2 | 14 | 7 | 12 | 6 | 1 | 1 | 3 | 14 | 1 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | ENE 10 | ENE 11 | E 12 | ENE 10 | E 9 | E 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
163 | 176 | 153 | 206 | 240 | 353 | 439 | 559 | 1402 | 2211 | 3116 | 4259 | 1621 | 1112 | 511 | 346 | 268 | 199 | 188 | 163 | 149 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 20 | 14 | 20 | 20 | 20 | 14 | 20 | 20 | 133 | 151 | 347 | 96 | 5 | 0 | 14 | 14 | 14 | 14 | 14 | 5 |
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.











