Surf Forecasts:
Kahului Harbor surf forecast from 29 Aug 2026:
- Most powerful swell: Tuesday 1 Sep, 11AM (local time) - 6.5ft (2.0m), 8s period, ENE swell with 500 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 2.0m 8s and forecast to arrive on Tuesday (Sep 01) 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 0.4m 11s period and expected on Friday (Sep 04) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Tue 1st Sep) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright, let’s break it down. The only spot on the menu is Kahului Harbor. It’s a reef break, exposed, and it’s for the advanced guys. Water temp is 27°, which is about normal for this time of year.
The first ten days or so are a real slog. From the 28th of August through the 10th of September, the wind is mostly cross-onshore, making a mess of things. Swell runs from 0.5ft up to around 7ft, but it’s short-period junk, 7 to 8 seconds, coming from the ENE. The combined energy starts moderate and then gets seriously strong, hitting 1959 (very strong) on the 7th of September. But with that wind, it’s a choppy, blown-out mess. This is more of a kiteboarder’s setup than a surfer’s.
Then, on the 11th of September, things shift. Friday morning brings a light SSW cross-offshore breeze at 6 mph, and by the afternoon it goes glassy with a light east wind. The swell is 5ft from the east, still short-period at 7 seconds. The energy is moderate (405 to 427). The report says “clean” and “glassy.” That’s your window. It’s a short-period swell, so the waves will be a bit soft and lumpy, not that deep, powerful groundswell, but clean conditions make a world of difference. The crowd factor is “sometimes,” so you might see a few others, but it’s not a zoo.
The 12th of September, the wind picks up again, and it’s back to marginal.
So, the clear standout is Friday the 11th of September. It’s not a classic, but it’s the only clean day in the whole 16-day stretch. Mark it on your calendar.
Stay patient, and keep your eyes on that Friday.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Fri night. Warm (max 27°C on Fri afternoon, min 25°C on Fri afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Mon night. Warm (max 27°C on Mon afternoon, min 24°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | NNE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 109 | 136 | 158 | 171 | 223 | 209 | 209 | 93 | 337 | 374 | 392 | 500 | 444 | 394 | 268 | 306 | 392 | 330 | 291 | 346 |
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 | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 8:03AM0.61m | ||||||||
Low Tide | 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 | 00:37AM0.07m | ||||||||
 |  |  | |  |  | | | | | | | | | | | | | | | |
 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — | — | 6:39 | — |
mm | — | 1 | 1 | — | — | — | — | — | 2 | — | 1 | 1 | 1 | — | — | 2 | 2 | — | — | — |
Temp °C | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 27 | 25 | 28 | 28 | 27 | 28 | 26 | 25 | 26 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | E 15 | E 13 | E 13 | E 12 | E 12 | E 11 | ENE 11 | NNE 7 | WSW 16 | WSW 15 | SW 16 | WSW 18 | SW 18 | E 13 | E 12 | E 15 | E 13 | E 12 | E 12 | E 12 |
| kJ | 109 | 130 | 125 | 106 | 72 | 62 | 39 | 93 | 24 | 21 | 9 | 30 | 12 | 14 | 27 | 38 | 123 | 110 | 141 | 72 |
Swell 2 Height (m) Direction Period (s) | NW 8 | NW 8 | NW 8 | SW 17 | WSW 17 | WSW 16 | WSW 16 | ENE 10 | W 13 | W 12 | W 13 | W 12 | W 12 | SW 17 | SW 16 | E 12 | E 11 | SW 14 | SW 14 | N 9 |
| kJ | 3 | 3 | 3 | 12 | 27 | 26 | 24 | 33 | 3 | 3 | 3 | 3 | 3 | 11 | 10 | 26 | 57 | 8 | 8 | 2 |
Swell 3 Height (m) Direction Period (s) | W 10 | W 19 | SW 18 | NW 8 | W 12 | W 12 | W 10 | WSW 16 | — | — | SW 19 | E 15 | E 15 | W 11 | W 10 | ESE 11 | SW 15 | NW 10 | NW 10 | W 9 |
| kJ | 2 | 7 | 12 | 3 | 3 | 3 | 2 | 24 | — | — | 15 | 4 | 4 | 10 | 9 | 12 | 9 | 4 | 4 | 2 |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 100 | 136 | 158 | 171 | 223 | 209 | 209 | 74 | 337 | 374 | 392 | 500 | 444 | 394 | 268 | 306 | 392 | 330 | 291 | 346 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 18 | 12 | 12 | 18 | 12 | 12 | 12 | 12 | 18 | 12 | 18 | 18 | 12 | 12 | 12 | 18 | 18 | 18 | 18 | 4 |
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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