Surf Forecasts:
Rivermouth_Wailuku surf forecast from 20 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 11AM (local time) - 5ft (1.6m), 16s period, E swell with 1,285 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 16s and forecast to arrive on Sunday (Jul 26) at 11AM. Winds are predicted to be 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 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sun 26th Jul) | 5ft (1.6m) 16s |
Table - best surf conditions forecast for Rivermouth_Wailuku over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's talk about what's happening at Rivermouth_Wailuku over the next couple of weeks.
Right off the bat, we've got a pretty grim run of surf. The whole first week is a write-off. From Monday the 20th to Friday the 24th, it's just poor conditions with messy, cross-onshore wind and weak, short-period swell. The combined energy is weak to moderate (173 to 410), but it doesn't matter because the wind is just ruining it. The water temp is about average for this time of year, so at least you won't freeze while you're staring at the chop.
The first real sign of life doesn't show up until Sunday the 26th. We get a pulse of energy from the east, with a very long period of 16 seconds and combined energy kicking into the strong range (1629). The swell is around 5ft, but the wind is finally onshore, which is a positive. However, the forecast calls it marginal, likely due to tricky tides. This is a groundswell, and with that kind of period, it's going to be bowling and wonky at a river mouth setup. It's more for the experienced crew who know the channel.
Monday the 27th and Tuesday the 28th keep that energy going, but the wind is light cross-onshore, keeping it a bit bumpy. The size is still around 5ft to 6ft, with a long period swell (13-14 seconds) and moderate energy (1075). Still not clean, but it's the best we've seen all week. By Wednesday the 29th, the swell bumps up to 6ft, but it's still cross-on. The crowds are likely here, so don't expect a lonely session.
After that, it fades. From Thursday the 30th of July right through to the end of the forecast window on Tuesday the 4th of August, it's back to poor to marginal conditions with small, weak swell and choppy winds. The energy drops right off (121 to 537), and the size is barely pushable.
So, the honest truth is there's no standout, epic session in this 16-day window. The best you're going to get is the Sunday the 26th through to Wednesday the 29th, where the swell is actually solid and has some punch. But the wind is never truly clean, and the tide is going to be a factor. The river mouth is inconsistent at the best of times, and this period is no exception. It's a waiting game.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 27°C on Mon afternoon, min 24°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 27°C on Fri morning, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | ||||||||||||||
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 7 | ENE 7 | ENE 12 | E 12 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | NE 8 | E 17 | E 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 120 | 169 | 220 | 158 | 158 | 158 | 158 | 123 | 559 | 139 | 212 | 240 | 244 | 289 | 379 | 389 | 344 | 587 | 1201 |
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-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 7:53AM0.45m | 6:01PM0.55m | 10:04AM0.50m | 5:44PM0.49m | 11:40AM0.58m | 12:27PM0.64m | 1:01PM0.69m | 1:30PM0.73m | 11:19PM0.34m | ||||||||||
Low Tide | 1:00AM0.14m | 12:18PM0.37m | 1:38AM0.12m | 2:16PM0.46m | 2:25AM0.11m | 3:23AM0.09m | 4:25AM0.06m | 5:21AM0.03m | 8:39PM0.32m | ||||||||||
 |  |  | | |  |  | | | | | | | | |  | | | | |
 | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — |
 | 7:08 | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — |
mm | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — |
Temp °C | 25 | 26 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 26 | 27 | 25 |
Feels °C | 25 | 27 | 28 | 27 | 27 | 27 | 25 | 26 | 26 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | E 8 | W 12 | W 12 | E 12 | E 11 | E 14 | E 12 | E 11 | SW 18 | E 12 | WSW 20 | NNW 10 | ENE 10 | WSW 18 | SW 17 | E 16 | E 15 | E 17 | E 16 |
| kJ | 120 | 10 | 11 | 11 | 23 | 58 | 103 | 123 | 12 | 139 | 38 | 9 | 35 | 31 | 47 | 80 | 150 | 587 | 1201 |
Swell 2 Height (m) Direction Period (s) | NNE 8 | SW 18 | E 13 | WSW 16 | E 15 | E 11 | SW 16 | SW 16 | SW 23 | WSW 18 | NNW 10 | WSW 20 | SW 18 | NNW 9 | E 18 | WSW 16 | E 19 | SW 18 | SW 18 |
| kJ | 66 | 13 | 13 | 27 | 38 | 22 | 10 | 10 | 21 | 30 | 10 | 37 | 50 | 8 | 24 | 26 | 62 | 51 | 49 |
Swell 3 Height (m) Direction Period (s) | W 12 | E 14 | SW 18 | W 11 | SW 17 | SW 17 | W 11 | SW 24 | N 12 | NNW 11 | SW 16 | SW 16 | NNW 9 | E 19 | NNW 8 | NNW 8 | SW 16 | S 12 | — |
| kJ | 11 | 4 | 12 | 3 | 11 | 11 | 2 | 22 | 3 | 11 | 10 | 10 | 8 | 7 | 7 | 6 | 10 | 3 | — |
Wind waves Height (m) Direction Period (s) | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 12 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | NE 8 | NE 8 | NE 8 |
| kJ | — | 169 | 220 | 158 | 158 | 158 | 158 | 117 | 559 | 135 | 212 | 240 | 244 | 289 | 379 | 389 | 344 | 388 | 440 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 5 | 5 | 14 | 5 | 5 | 14 | 20 | 14 | 14 | 5 | 14 | 14 | 14 | 20 | 20 | 14 | 14 | 20 | 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.
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