Surf Forecasts:
Rivermouth_Wailuku surf forecast from 9 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 8PM (local time) - 10ft (3.0m), 13s period, ENE swell with 3,145 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 13s 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 0.3m 13s period and expected on Sunday (Aug 16) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sat 15th Aug) | 10ft (3.0m) 13s |
Table - best surf conditions forecast for Rivermouth_Wailuku over the next 16 days.
The Lowdown
G’day, Rusty here, and I’ve gotta be straight with you—this 16-day stretch for Rivermouth_Wailuku is a real test of patience. The entire first week and a half is pretty much a write-off, with persistent cross-onshore winds and choppy, messy conditions. You’ll be looking at at least an 8-day gap before anything even remotely surfable pops up. The water is sitting at a normal 80° for this time of year, so at least you won’t be freezing while you stare at the crud.
We kick off Sunday, August 9th, with a weak, short-period 5ft east swell, but with a 12 mph cross-onshore wind, it’s just a bumpy, blown-out mess. That same story runs all the way through to Saturday, August 15th. The swell does start to build, hitting 8ft by Saturday morning with energy climbing to 1603 (moderate), but the wind is still cross-on. By Saturday afternoon, it’s up to 10ft from the ENE with a period of 13 seconds—that’s a proper groundswell—and the wind turns onshore, but the conditions are still rated poor. That big swell, with combined energy over 2900 (strong), will be heaving, but it’s going to be a washing machine with the wind.
Sunday, August 16th, keeps the 10ft swell going, but it’s still messy. The first real glimmer of hope comes on Monday, August 17th. That’s your standout. The wind swings offshore from the SSW at 12 mph, and we get a 7ft NNE swell with a period of 9 seconds. The combined energy is 774 (moderate), and the conditions are forecast to be very good. That’s the day to circle—clean, offshore conditions on a solid, punchy swell. The afternoon drops off to a 5ft north swell, but the morning window is the real deal. Keep in mind, Rivermouth_Wailuku is a reef break, and it’s fairly consistent, but crowds are often a factor here, so get in early.
After that, Tuesday, August 18th, goes glassy in the morning with a tiny 3ft swell—clean but small. Then it’s back to the cross-on junk for the rest of the run. The second week is a wasteland of weak, short-period E/ENE swells and onshore winds, with the odd rumble of a thunderstorm. The swell tries to build again around Saturday, August 23rd, with 8ft from the east, but the cross-onshore wind kills it.
So, bottom line: if you’ve got the patience, the Monday morning of August 17th is your best and only real shot at something special. The rest is a long, slow grind.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 27°C on Sun morning, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Wed morning, min 25°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 10 | ENE 11 | ENE 13 | ENE 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 265 | 314 | 302 | 232 | 246 | 196 | 186 | 199 | 164 | 158 | 145 | 160 | 176 | 195 | 303 | 376 | 460 | 772 | 1547 | 2904 | 3145 |
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 | on | on |
High Tide | 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 | 4:12PM0.73m | 4:46AM0.57m | |||||||
Low Tide | 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 | 9:48AM0.11m | 10:40PM0.12m | ||||||||
 |  |  |  | | | | | | | | | | | | | |  | | | | |
 | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — |
mm | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — |
Temp °C | 27 | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 26 | 27 | 25 |
Feels °C | 28 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 25 | 27 | 27 | 24 | 26 | 26 | 24 | 26 | 27 | 25 | 26 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | NE 9 | NNW 11 | NNW 10 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | W 13 | W 12 | W 12 | NNW 9 | NNW 8 | NNW 7 | NNW 7 | NNW 10 | E 16 | NNW 8 | ENE 13 |
| kJ | 13 | 24 | 20 | 16 | 16 | 13 | 12 | 6 | 5 | 5 | 13 | 11 | 11 | 8 | 6 | 5 | 5 | 9 | 48 | 7 | 3145 |
Swell 2 Height (m) Direction Period (s) | WSW 17 | WSW 16 | NE 9 | NE 8 | W 10 | W 10 | W 10 | ESE 9 | W 11 | W 10 | NNW 7 | NW 7 | NW 9 | W 12 | W 12 | W 12 | W 12 | W 11 | NNW 9 | W 11 | W 13 |
| kJ | 27 | 26 | 12 | 11 | 8 | 8 | 8 | 8 | 9 | 8 | 5 | 2 | 3 | 11 | 11 | 11 | 11 | 10 | 8 | 10 | 30 |
Swell 3 Height (m) Direction Period (s) | W 12 | W 11 | W 11 | W 11 | SW 16 | SW 15 | SW 15 | W 10 | W 13 | SW 18 | SW 18 | SW 16 | NW 7 | SW 16 | SW 15 | S 14 | S 14 | W 17 | W 11 | — | NNW 8 |
| kJ | 11 | 10 | 9 | 9 | 10 | 9 | 9 | 8 | 3 | 12 | 12 | 11 | 2 | 10 | 9 | 4 | 4 | 6 | 9 | — | 6 |
Wind waves Height (m) Direction Period (s) | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 10 | ENE 11 | ENE 13 | — |
| kJ | 265 | 314 | 302 | 232 | 246 | 196 | 186 | 199 | 164 | 158 | 145 | 160 | 176 | 195 | 303 | 376 | 460 | 772 | 1547 | 2904 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 14 | 14 | 14 | 14 | 20 | 14 | 14 | 20 | 14 | 14 | 20 | 14 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 35 | 20 |
Best forecast wave conditions in Maui | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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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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