Surf Forecasts:
Kahului Harbor surf forecast from 16 Sep 2026:
- Most powerful swell: Tuesday 22 Sep, 11PM (local time) - 7.5ft (2.3m), 10s period, E swell with 1,141 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 2.3m 10s and forecast to arrive on Tuesday (Sep 22) 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 0.4m 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 | 11PM (Tue 22nd Sep) | 7.5ft (2.3m) 10s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright, Rusty here again, same story, different numbers.
Looking at Kahului Harbor for the next 16 days, and frankly, it’s a tough one. There’s a big gap with nothing worthwhile for a surfer. The whole run is plagued by cross and cross-onshore winds out of the NE and ENE, just messing up any potential.
The swell is coming from the ENE, but the quality is the main issue. The combined energy stays in a moderate to strong range (363 to over 1100), but it’s all wasted on choppy, lumpy, and messy surfaces. For the first week and a half, it’s all “poor surf conditions” with low scores. Water temp is about what you’d expect for this time of year.
There’s one small window for the advanced guys. On Friday, September 25th into Saturday the 26th, the wind switches to a cross-offshore from the SE. The waves will be about 5ft to 6ft from the ENE with a short 8-second period, but for the first time, the report says “clean.” It’s still a marginal forecast, so don't get your hopes up too high, but it’s the best on offer. The energy will be weak-to-moderate (around 381 to 525), so it’s not big, just the cleanest. Watch for those afternoon thunderstorms.
That Friday morning is your best bet if you really need to get wet. Otherwise, I’d save your energy for another day.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Thu afternoon. Warm (max 28°C on Wed afternoon, min 25°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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) | NNE 8 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 56 | 353 | 427 | 439 | 633 | 505 | 404 | 350 | 383 | 341 | 358 | 412 | 412 | 402 | 392 | 361 | 521 | 645 | 660 |
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 | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross |
High Tide | 5:57AM0.62m | 3:16PM0.48m | 7:25AM0.57m | 10:10AM0.58m | 11:23AM0.62m | 11:58AM0.67m | 11:04PM0.32m | 12:24PM0.71m | 11:46PM0.39m | ||||||||||
Low Tide | 10:19PM0.06m | 11:48AM0.43m | 10:43PM0.10m | 11:13PM0.14m | 00:18AM0.19m | 3:22AM0.20m | 7:29PM0.28m | 4:47AM0.16m | 7:14PM0.26m | ||||||||||
 |  | | |  |  | | | |  | | | | | | | | |  | |
 | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 6:28 | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — |
mm | 1 | — | — | 1 | — | 4 | 3 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 28 | 26 | 27 | 27 | 26 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 28 | 29 | 30 | 27 | 29 | 28 | 27 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 28 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | NNE 8 | SW 18 | SW 18 | SW 17 | WSW 16 | SW 16 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | WSW 16 | WSW 15 | SW 15 | SW 15 | SW 14 | NW 12 |
| kJ | 50 | 80 | 79 | 77 | 51 | 66 | 77 | 78 | 76 | 69 | 41 | 40 | 40 | 24 | 22 | 9 | 8 | 8 | 5 |
Swell 2 Height (m) Direction Period (s) | E 11 | N 9 | NNE 9 | NW 10 | W 10 | SW 20 | W 10 | NW 11 | NW 10 | NW 9 | NW 9 | NW 11 | NW 10 | N 11 | N 11 | NNW 10 | N 10 | N 10 | NW 9 |
| kJ | 56 | 7 | 8 | 4 | 2 | 15 | 2 | 5 | 4 | 3 | 3 | 4 | 4 | 3 | 2 | 11 | 2 | 2 | 3 |
Swell 3 Height (m) Direction Period (s) | WSW 19 | NW 9 | NW 9 | W 8 | SW 20 | NW 10 | NW 12 | W 9 | W 9 | W 9 | W 9 | W 9 | N 12 | NW 9 | NW 9 | W 12 | W 12 | W 11 | W 11 |
| kJ | 73 | 3 | 3 | 1 | 15 | 4 | 6 | 2 | 2 | 2 | 2 | 1 | 3 | 3 | 3 | 3 | 3 | 2 | 2 |
Wind waves Height (m) Direction Period (s) | E 6 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 |
| kJ | 37 | 353 | 427 | 439 | 633 | 505 | 404 | 350 | 383 | 341 | 358 | 412 | 412 | 402 | 392 | 361 | 521 | 645 | 660 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 12 | 18 | 18 | 12 | 12 | 12 | 12 | 115 | 12 | 12 | 12 | 12 | 12 | 18 | 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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