Surf Forecasts:
Kahului Harbor surf forecast from 28 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 11AM (local time) - 6ft (1.9m), 12s period, E swell with 959 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 1.9m 12s and forecast to arrive on Thursday (Sep 03) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 17s period and expected on Saturday (Aug 29) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 3rd Sep) | 6ft (1.9m) 12s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Right then, let’s talk about what we’ve got. The whole 16-day window is pretty much a write-off for decent surf. There’s only one spot that ever gets mentioned, and that’s Kahului Harbor, a reef break that takes an optimum swell from the NNE. But the problem is, we’re looking at a long stretch of poor conditions all the way from late August well into mid-September.
For the first couple of weeks, it’s a grind. From Thursday the 27th of August right through to Wednesday the 9th of September, the forecast is consistently poor or marginal. The swell direction is all wrong – mostly ENE or NE, which is cross-on or cross-shore for this spot. That means it’s choppy, bumpy, and just plain messy. Swell heights bob around from 2ft to just over 7ft, but the periods are often short, under 8 seconds, so it’s weak, crumbly stuff. The combined energy is mostly moderate, in the low to mid-hundreds, but it never lines up right. Honestly, there’s nothing to get excited about. The water temp is sitting at a fairly average 80°, nothing special.
Then, finally, there’s a flicker of hope on Thursday the 10th of September. The wind swings around to a light SSW, giving us a clean offshore flow. The swell is from the east at 4-4ft with a longer period of 10-11 seconds, which is proper groundswell. The combined energy jumps up to a moderate 494, which is the best we’ve seen. This is the standout of the whole outlook – but it’s still only a 4ft wave. For a reef, that’s clean and fun for someone who knows the break, but it’s not going to set the world on fire. The crowd factor says “sometimes,” so you might share it with a few others. After that, Friday the 11th looks a bit mixed again with cross-shore wind and a little chop, so the window closes fast.
All in all, this is a rough run. The area really needs a better swell direction to make Kahului Harbor work. A blank patch like this isn’t uncommon for a spot that’s so picky about its wind and swell. You’d be better off checking back in a week or so.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon morning. Warm (max 27°C on Sun afternoon, min 24°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Thu 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | ||||||||||||||
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 6 | ENE 6 | ENE 7 | E 15 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | NE 8 | NE 8 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 133 | 108 | 111 | 109 | 130 | 156 | 189 | 197 | 229 | 204 | 88 | 291 | 408 | 384 | 428 | 374 | 326 | 318 | 523 | 704 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross |
High Tide | 2:37PM0.81m | 2:14AM0.56m | 2:57PM0.80m | 2:52AM0.60m | 3:16PM0.76m | 3:32AM0.62m | 3:34PM0.71m | 4:17AM0.64m | 3:49PM0.64m | 5:09AM0.63m | 4:00PM0.58m | 6:16AM0.62m | 3:55PM0.52m | |||||||
Low Tide | 8:55PM0.17m | 8:15AM0.02m | 9:15PM0.13m | 8:48AM0.07m | 9:38PM0.10m | 9:22AM0.14m | 10:01PM0.07m | 9:59AM0.23m | 10:28PM0.05m | 10:40AM0.33m | 10:59PM0.04m | 11:36AM0.43m | 11:38PM0.05m | |||||||
 |  | | | |  | | | | | |  | | | | | | | |  | |
 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — | — | — | — | 1 |
Temp °C | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 26 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 26 | 25 | 26 | 25 | 25 | 27 | 27 | 25 | 25 | 27 | 25 | 27 | 27 | 25 | 28 | 27 | 28 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | N 8 | NNE 7 | E 15 | E 15 | E 13 | E 13 | E 12 | E 12 | E 11 | E 11 | NNE 6 | WSW 16 | SW 15 | SW 16 | WSW 18 | E 15 | E 14 | ESE 12 | SW 16 | E 13 |
| kJ | 11 | 9 | 72 | 109 | 130 | 125 | 106 | 72 | 62 | 59 | 69 | 24 | 9 | 9 | 30 | 17 | 93 | 208 | 10 | 704 |
Swell 2 Height (m) Direction Period (s) | NW 9 | E 16 | NNE 6 | WNW 8 | NW 8 | NW 8 | SW 17 | WSW 17 | WSW 16 | WSW 16 | ENE 10 | W 11 | W 12 | W 13 | W 12 | SW 18 | SW 17 | SW 16 | W 10 | SW 15 |
| kJ | 14 | 44 | 8 | 7 | 3 | 3 | 12 | 27 | 26 | 24 | 33 | 2 | 3 | 3 | 12 | 12 | 11 | 10 | 2 | 9 |
Swell 3 Height (m) Direction Period (s) | SW 16 | WNW 9 | WNW 9 | W 10 | N 7 | SW 18 | NW 8 | NW 8 | W 12 | W 10 | WSW 16 | — | W 15 | SW 19 | E 15 | W 12 | W 11 | W 10 | NW 11 | W 10 |
| kJ | 10 | 8 | 8 | 2 | 1 | 12 | 3 | 3 | 3 | 2 | 24 | — | 4 | 15 | 4 | 11 | 10 | 8 | 5 | 2 |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | ENE 7 | ENE 5 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | NE 8 | NE 8 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 7 |
| kJ | 133 | 108 | 111 | 90 | 121 | 156 | 189 | 197 | 229 | 204 | 88 | 291 | 408 | 384 | 428 | 374 | 326 | 318 | 523 | 223 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 19 | 18 | 12 | 18 | 12 | 12 | 18 | 12 | 12 | 12 | 12 | 18 | 18 | 4 | 12 | 12 | 12 | 4 | 12 | 12 |
Best forecast wave conditions in Maui | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kahului Harbor surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest