Surf Forecasts:
Kahului Harbor surf forecast from 15 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 11AM (local time) - 7ft (2.1m), 10s period, ENE swell with 752 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 2.1m 10s and forecast to arrive on Thursday (Sep 17) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 18s period and expected on Wednesday (Sep 16) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 17th Sep) | 7ft (2.1m) 10s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what we've got for the surf over the next couple of weeks. I'm not gonna sugarcoat it – this is a tough stretch. We're looking at a long, dry period where nothing really lines up.
We start off with Kahului Harbor on Tuesday, September 15th. There's a little bit of swell in the water, maybe 3ft from the NE on the morning, but the wind is coming from the ENE at 9 mph, putting us in a cross-onshore situation. The combined swell energy is weak, only 128, and the report says it's poor surf conditions. It stays like that for days. We get a bump in energy mid-week around Thursday the 17th, with swell hitting 7ft from the ENE, and the energy climbs to a moderate 752. But again, the wind is cross-shore and choppy, and the period is short at 9 seconds. Nothing clean about it. This run of messy, poor quality surf stretches all the way through to the 25th.
Even when the swell jumps up to 8ft from the east on Tuesday the 22nd, with strong wave energy of 1052, the wind is a fresh cross-onshore at 19 mph, making it lumpy and blown out. At that size with that wind, this is more of a kite-surfing setup than a paddle-surfing one, especially at a reef break like this.
Now, there is one date to keep a very loose eye on. On Saturday the 26th, there's a blip on the radar. We see a 2ft swell from the NW with a very long period of 18 seconds. The energy is a moderate 597. But the wind is still cross-onshore, making it choppy, and the report calls it marginal. A long period groundswell like that (18 seconds!) can be really special at a reef break, but with that onshore breeze, it's gonna be a mess. It's a promise of something good that just gets ruined by the wind.
Overall, there are no standout days in this 16-day window. The best we can say is that on Saturday the 26th there's a hint of a decent groundswell, but the conditions are against it. For everything else, it's a waiting game. Forecasts can change, so don't write it off completely, but as it stands, you might be better off doing something else for a while.
- Rusty
Short Range ForecastLight rain (total 5mm), mostly falling on Thu afternoon. Warm (max 28°C on Wed afternoon, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Thu night. Warm (max 28°C on Fri morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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) | NE 8 | NE 8 | E 11 | NNE 8 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 8 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 86 | 73 | 39 | 56 | 245 | 338 | 394 | 752 | 579 | 471 | 428 | 374 | 349 | 358 | 358 | 359 | 350 | 350 | 361 |
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-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross |
High Tide | 5:04AM0.66m | 3:32PM0.52m | 5:57AM0.62m | 3:16PM0.48m | 7:25AM0.57m | 10:10AM0.58m | 11:23AM0.62m | 11:58AM0.67m | 11:04PM0.32m | ||||||||||
Low Tide | 9:58PM0.04m | 10:54AM0.36m | 10:19PM0.06m | 11:48AM0.43m | 10:43PM0.10m | 11:13PM0.14m | 00:18AM0.19m | 3:22AM0.20m | 7:29PM0.28m | 4:47AM0.16m | |||||||||
 |  |  |  | | | |  | |  | | | | | | | | | | |
 | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 6:29 | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — |
mm | — | — | — | — | — | — | — | 1 | 4 | 3 | — | 1 | — | — | — | — | — | — | — |
Temp °C | 25 | 27 | 27 | 26 | 27 | 28 | 26 | 27 | 27 | 26 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 25 |
Feels °C | 27 | 29 | 29 | 28 | 29 | 30 | 27 | 29 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | NE 8 | E 12 | NNE 8 | NNE 8 | SW 18 | SW 18 | NNE 8 | SW 16 | SW 16 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | WSW 15 | SW 15 | SW 15 |
| kJ | 86 | 45 | 35 | 50 | 80 | 79 | 36 | 66 | 66 | 77 | 78 | 76 | 69 | 41 | 40 | 40 | 23 | 35 | 9 |
Swell 2 Height (m) Direction Period (s) | E 13 | WSW 20 | E 11 | E 11 | N 9 | NNE 9 | SW 17 | W 10 | SW 20 | W 10 | NW 11 | NW 10 | NW 9 | NW 9 | NW 8 | N 12 | N 12 | N 11 | NNW 10 |
| kJ | 30 | 75 | 39 | 56 | 7 | 8 | 77 | 2 | 15 | 2 | 5 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 11 |
Swell 3 Height (m) Direction Period (s) | NNE 10 | NE 8 | WSW 19 | WSW 19 | NW 9 | NW 9 | NW 10 | W 8 | W 10 | W 9 | W 10 | W 9 | W 9 | W 9 | W 9 | N 10 | NW 9 | NW 9 | W 12 |
| kJ | 10 | 10 | 74 | 73 | 3 | 3 | 4 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 2 | 3 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | — | NE 8 | ENE 4 | E 6 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 8 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | — | 73 | 33 | 29 | 245 | 338 | 394 | 752 | 579 | 471 | 428 | 374 | 349 | 358 | 358 | 359 | 350 | 350 | 361 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 4 | 18 | 4 | 12 | 18 | 18 | 12 | 20 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 18 | 12 |
Best forecast wave conditions in Maui | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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