Surf Forecasts:
Rivermouth_Wailuku surf forecast from 10 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 15ft (4.5m), 13s period, ENE swell with 7,037 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 13s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Sunday (Aug 16) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 15ft (4.5m) 13s |
Table - best surf conditions forecast for Rivermouth_Wailuku over the next 16 days.
The Lowdown
Right, cobber, Rusty here. Look, normally I’d be chomping at the bit to give you the goods, but this 16-day window is a bit of a shocker for Rivermouth Wailuku. Honestly, for the first week and a half, it’s a write-off. We’ve got a solid run of poor surf from Sunday the 9th through to Saturday the 15th, and then again from Tuesday the 18th onwards. That’s a long, ugly stretch with no real recommendations.
The only flicker of hope comes on Sunday the 16th of August, but it’s a tricky one. That morning, the swell jumps up to a chunky 15 ft from the NE, with a period of 12 seconds and the energy is huge (6456). But the conditions are problem: cross-on wind at 12 mph and risk of thunderstorms, so it’s sloppy. It’s quoted as marginal. This is big, powerful stuff—well over 8 ft, so it’s experts-only at this reef setup. The afternoon eases to 8 ft from the N, still messy with cross-shore breeze. Hardly a standout.
Then, believe it or not, the standout window is on Monday the 17th of August. This is your best shot. The morning brings a clean 5 ft swell from the ENE, period around 8 seconds (moderate energy of 353), but the wind is light from the south at 3 mph, making it cross-off and clean. The afternoon gets even better: glassy conditions with a 3 mph SSW breeze and the swell drops to 4 ft. It’s not big, but it’ll be super clean and rideable. For a reef break like this, that’s your moment.
After that, from Tuesday the 18th, it’s back to poor, choppy, cross-on muck. Nothing else worth paddling out for.
So to sum up: sit tight through a long, flat, junk stretch. Mark Monday the 17th of August in your calendar—morning or afternoon—for clean, glassy waves at Rivermouth Wailuku. It won’t be huge, but it’ll be the pick of a very average bunch.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 27°C on Mon morning, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Sat morning. Warm (max 27°C on Wed afternoon, min 25°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | ENE 11 | E 13 | ENE 13 | ENE 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 302 | 257 | 202 | 246 | 191 | 191 | 191 | 164 | 145 | 168 | 137 | 177 | 210 | 303 | 439 | 495 | 1279 | 3198 | 4168 | 5028 |
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 | on | on |
High Tide | 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 | |||||||
 |  |  | | | | | | |  | | | | | | |  | | |  | |
 | — | — | 6:03 | — | — | 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 | — | 2 |
Temp °C | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 26 | 26 | 27 | 25 |
Feels °C | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 24 | 27 | 27 | 25 | 27 | 27 | 25 | 26 | 26 | 26 | 26 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | 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 | E 13 | NNW 9 | NNW 8 | ENE 13 | ENE 13 |
| kJ | 24 | 20 | 16 | 16 | 13 | 12 | 6 | 5 | 5 | 13 | 11 | 11 | 7 | 6 | 5 | 215 | 8 | 7 | 4168 | 5028 |
Swell 2 Height (m) Direction Period (s) | WSW 16 | NE 9 | NE 8 | W 10 | NE 8 | W 10 | W 10 | W 11 | W 10 | NNW 7 | NW 7 | NW 9 | W 12 | W 12 | W 12 | NNW 7 | W 11 | W 11 | NNW 8 | W 13 |
| kJ | 26 | 12 | 11 | 8 | 10 | 8 | 8 | 9 | 8 | 5 | 2 | 3 | 11 | 11 | 11 | 5 | 10 | 9 | 6 | 31 |
Swell 3 Height (m) Direction Period (s) | W 11 | W 11 | W 11 | SW 16 | W 10 | SW 15 | W 14 | SW 14 | SW 18 | SW 18 | SW 16 | N 7 | SW 17 | SW 15 | E 16 | W 12 | SW 17 | — | W 11 | — |
| kJ | 10 | 9 | 9 | 10 | 8 | 9 | 4 | 7 | 12 | 12 | 11 | 1 | 11 | 9 | 5 | 11 | 12 | — | 10 | — |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | ENE 11 | E 13 | — | — |
| kJ | 302 | 257 | 202 | 246 | 191 | 191 | 191 | 164 | 145 | 168 | 137 | 177 | 210 | 303 | 439 | 495 | 1279 | 3198 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 14 | 5 | 20 | 14 | 5 | 20 | 14 | 14 | 20 | 14 | 20 | 20 | 20 | 14 | 20 | 20 | 20 | 20 | 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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