Surf Forecasts:
Kahului Harbor surf forecast from 31 Aug 2026:
- Most powerful swell: Saturday 5 Sep, 11AM (local time) - 8ft (2.4m), 13s period, ENE swell with 1,930 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 2.4m 13s and forecast to arrive on Saturday (Sep 05) 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 0.3m 10s period and expected on Sunday (Sep 06) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sat 5th Sep) | 8ft (2.4m) 13s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright, I’m Rusty, and I’m looking at Kahului Harbor for you. Truth is, for the first week and a half, the surf is pretty much a bust. The wind is blowing from the wrong direction, mostly cross or cross-onshore, and the water is choppy and lumpy. The water temperature is about what you’d expect for this time of year.
From Monday the 31st of August through Friday the 4th of September, the swell is coming from the ENE at 6 ft to 7 ft, but with a short period of 8 seconds, and the combined energy is moderate (356 to 793). The wind is a steady 12 to 19 mph from the ENE, making it look more like a kiteboarding spot than a surf break at this beach-and-reef setup. The scores are zero – don’t waste your time.
Saturday the 5th and Sunday the 6th of September bring a bigger swell. The wave height jumps to 8 ft, still from the ENE, but the period stretches to 13 seconds – that’s a groundswell with some real power. Combined energy is strong (1950 and 1521). But the wind is still cross or cross-onshore at 12 mph, so it’s going to be bumpy. The forecast calls it “marginal” – you could try if you’re a real expert, but it’s not clean.
Then Monday the 7th of September sees a chunky 10 ft to 12 ft swell from the ENE with a 12-13 second period. Combined energy is very strong (2482 and 4428). That’s a lot of water moving, but the wind is howling at 19 mph from the NE, cross-onshore, and the wave comment is “poor surf conditions.” This is expert-only, and it’s going to be a messy, windy mess. Skip it.
The one true standout comes on Wednesday the 9th of September. The morning is glassy with a 3 mph wind from the ESE. The swell is 7 ft from the ENE at 8 seconds, and combined energy is moderate (688). The wind is glass, the wave comment says “expect very good surf conditions,” and the score is a 3. That’s the best window. The afternoon gets a light cross-onshore, so hit the morning. It’s a short period, so not a classic groundswell, but clean and head-high is a solid call.
After that, from Thursday the 10th of September onward, the surf drops off hard. Swell goes down to 4 ft and below, wind stays onshore or cross, and scores hit zero. It’s a dead zone.
If you’re going to paddle out, make it Wednesday the 9th of September, first light, glassy conditions at Kahului Harbor. That’s your one.
Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Sun night. Warm (max 27°C on Mon morning, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 28°C on Sat morning, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
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 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 13 | ENE 13 | ENE 13 | E 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 236 | 356 | 374 | 345 | 464 | 423 | 334 | 336 | 339 | 469 | 440 | 408 | 481 | 509 | 398 | 1592 | 1930 | 1713 | 1843 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 4:17AM0.64m | 3:49PM0.64m | 5:09AM0.63m | 4:00PM0.58m | 6:16AM0.62m | 3:55PM0.52m | 8:03AM0.61m | 10:22AM0.66m | 11:33AM0.74m | ||||||||||
Low Tide | 10:01PM0.07m | 9:59AM0.23m | 10:28PM0.05m | 10:40AM0.33m | 10:59PM0.04m | 11:36AM0.43m | 11:38PM0.05m | 00:37AM0.07m | 2:20AM0.09m | 4:07AM0.07m | |||||||||
 |  |  |  |  | |  | | | | | | | | | | |  | | |
 | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 6:43 | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — |
mm | 1 | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | 2 | — |
Temp °C | 26 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 27 | 27 | 26 | 28 | 28 | 27 |
Feels °C | 27 | 26 | 27 | 24 | 27 | 27 | 26 | 27 | 27 | 25 | 25 | 25 | 23 | 26 | 26 | 26 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | WSW 16 | WSW 16 | WSW 15 | SW 16 | SW 18 | SE 11 | ESE 10 | E 14 | E 14 | NW 10 | E 12 | E 12 | E 13 | E 13 | E 13 | NNE 11 | NNE 10 | NNE 10 | ENE 12 |
| kJ | 24 | 24 | 22 | 9 | 12 | 5 | 19 | 66 | 63 | 4 | 109 | 107 | 225 | 281 | 347 | 12 | 20 | 31 | 1428 |
Swell 2 Height (m) Direction Period (s) | W 11 | W 13 | W 12 | W 13 | W 12 | SW 18 | E 13 | SW 16 | SW 16 | SW 15 | NW 10 | NW 10 | NW 9 | NW 9 | N 13 | SW 13 | SSW 12 | SSW 12 | NNE 8 |
| kJ | 2 | 3 | 3 | 3 | 3 | 12 | 14 | 10 | 10 | 9 | 4 | 4 | 3 | 3 | 3 | 7 | 13 | 14 | 23 |
Swell 3 Height (m) Direction Period (s) | W 8 | — | — | SW 19 | SW 15 | W 12 | SW 17 | E 12 | NW 11 | W 10 | SW 14 | SW 14 | S 13 | SW 18 | — | — | SW 17 | SW 17 | SW 11 |
| kJ | 1 | — | — | 15 | 8 | 3 | 11 | 11 | 5 | 2 | 8 | 8 | 3 | 12 | — | — | 12 | 12 | 19 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 13 | ENE 13 | ENE 13 | E 13 |
| kJ | 236 | 356 | 374 | 345 | 464 | 423 | 334 | 336 | 339 | 469 | 440 | 408 | 481 | 509 | 398 | 1592 | 1930 | 1713 | 1843 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 12 | 18 | 18 | 18 | 18 | 12 | 12 | 18 | 12 | 20 | 131 | 18 | 18 | 12 | 12 | 12 | 12 | 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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