Surf Forecasts:
Kahului Harbor surf forecast from 3 Aug 2026:
- Most powerful swell: Monday 3 Aug, 11PM (local time) - 4.5ft (1.4m), 12s period, ENE swell with 541 kJ wave energy.
Best Forecast Surf Conditions for Kahului Harbor this week:
The most powerful waves expected at Kahului Harbor in the next 16 days are 1.4m 12s and forecast to arrive on Monday (Aug 03) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 11s period and expected on Sunday (Aug 09) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Mon 3rd Aug) | 4.5ft (1.4m) 12s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you – this outlook for Kahului Harbor is a tough one. We’re looking at a long, dry spell of poor conditions that stretches for most of the 16-day window. The surf is technically there, but the wind is just messing everything up. The water is sitting at 80°F right now, which is about average for this time of year.
The first real chance you’ll want to even look at the water is on Monday, August 18th. That’s a long way off, nearly two weeks. Before that, from Monday, August 3rd all the way through Sunday, August 17th, it’s a total write-off. Wind is mostly cross-onshore or cross-shore, and the swell is choppy. The combined energy stays moderate, hovering between 103 and 591, but the quality is just not there. You’ll be fighting a mess.
Even the best we see comes with a big caveat. On Tuesday afternoon, August 18th, things finally get interesting. The wind shifts to a light cross-offshore breeze from the southeast, and the forecast is for “very good surf conditions.” The swell is 7ft coming from the ENE with a period of 9 seconds, generating solid moderate energy (743). That’s a clean, rippable wave. But here’s the thing – this is a reef break for advanced surfers only. It’s also consistent, exposed to the swell, and the optimum direction is NNE, so the ENE swell is a little off. Crowds are possible here, so you’ll have company. This is your one standout, but it’s a long way out and only for the experienced crew.
The rest of the window? Forget it. The wind is relentless, and the waves are just a mess of cross-chop and onshore crud. It’s not a good run for the area, but it happens. By the time we hit August 18th, you’ll be ready.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed night. Warm (max 27°C on Mon morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Warm (max 27°C on Sat morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | |||||||||||||||
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 8 | ENE 8 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | E 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 261 | 273 | 447 | 436 | 460 | 325 | 207 | 280 | 169 | 149 | 131 | 97 | 93 | 106 | 166 | 171 | 261 | 265 | 365 | 384 | 280 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross |
High Tide | 4:58PM0.65m | 6:31AM0.50m | 5:07PM0.58m | 8:17AM0.53m | 4:59PM0.52m | 10:35AM0.60m | 11:51AM0.70m | 12:37PM0.79m | 10:03PM0.34m | 1:16PM0.86m | 11:50PM0.37m | ||||||||||
Low Tide | 10:39AM0.24m | 11:58PM0.11m | 11:22AM0.35m | 00:37AM0.08m | 12:37PM0.46m | 1:32AM0.06m | 2:47AM0.04m | 4:09AM0.00m | 8:44PM0.33m | 5:19AM-0.05m | 8:26PM0.30m | ||||||||||
 | |  |  | |  | | |  | | | | | | | | | |  | |  | |
 | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | — | 7:02 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 1 |
Temp °C | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 26 | 26 | 25 |
Feels °C | 29 | 29 | 28 | 29 | 28 | 28 | 28 | 28 | 26 | 27 | 27 | 26 | 26 | 26 | 24 | 27 | 27 | 25 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | E 12 | ENE 11 | ENE 11 | W 13 | ENE 10 | ENE 9 | NNE 8 | NNE 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NE 9 | NE 11 | NE 9 | N 6 | NE 10 | NE 10 | W 12 | W 11 |
| kJ | 261 | 104 | 447 | 436 | 13 | 325 | 207 | 7 | 6 | 7 | 6 | 11 | 10 | 22 | 29 | 29 | 3 | 15 | 14 | 11 | 21 |
Swell 2 Height (m) Direction Period (s) | E 13 | N 8 | N 5 | W 11 | N 10 | N 9 | NNE 9 | W 12 | W 12 | N 8 | N 8 | NE 11 | W 10 | NNW 7 | NE 8 | N 7 | WSW 18 | WSW 18 | W 12 | WSW 16 | WSW 16 |
| kJ | 119 | 4 | 9 | 2 | 2 | 7 | 8 | 11 | 11 | 5 | 4 | 5 | 2 | 10 | 11 | 3 | 31 | 30 | 11 | 26 | 25 |
Swell 3 Height (m) Direction Period (s) | N 8 | W 12 | N 7 | SW 17 | SW 17 | W 12 | W 12 | SW 16 | SW 16 | W 11 | W 12 | W 12 | SW 14 | NE 12 | NNW 7 | WSW 18 | SW 13 | W 12 | WSW 17 | S 12 | N 10 |
| kJ | 10 | 11 | 4 | 11 | 11 | 12 | 11 | 10 | 9 | 10 | 11 | 11 | 8 | 21 | 5 | 33 | 7 | 11 | 27 | 3 | 2 |
Wind waves Height (m) Direction Period (s) | — | ENE 8 | — | — | ENE 11 | — | — | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | E 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 |
| kJ | — | 273 | — | — | 460 | — | — | 280 | 169 | 149 | 131 | 97 | 93 | 106 | 166 | 171 | 261 | 265 | 365 | 384 | 280 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 11 | 4 | 4 | 11 | 4 | 12 | 4 | 12 | 4 | 12 | 12 | 12 | 18 | 12 | 12 | 18 | 12 | 12 | 12 | 12 |
Best forecast wave conditions in Maui | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Kahului Harbor Surf forecast
The above surf forecast table for Kahului Harbor provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kahului Harbor can be found by selecting the local surf guide option on the grey menu. Our Kahului Harbor 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 (Kahului Harbor) 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 Kahului Harbor 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.
Kahului Harbor is 3 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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