Surf Forecasts:
Kahului Harbor surf forecast from 5 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 5PM (local time) - 6ft (1.8m), 8s period, ENE swell with 384 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 1.8m 8s and forecast to arrive on Sunday (Aug 09) at 5PM. 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 12s period and expected on Wednesday (Aug 05) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Sun 9th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright, let's be straight with you for Kahului Harbor. Over these 16 days, we've got nothing to get excited about. The surf’s there, but the wind is just wrecking it every single time.
We start getting some rideable swell early on, but the wind is always coming from the ENE, which is cross or cross-onshore for this spot. It’s the kiss of death for Kahului Harbor because it needs a clean north-northeast offshore breeze. So from the start, it’s just choppy, messy waves.
By Friday the 8th of August, we’ve got some 5-foot waves pushing in from the east-northeast, and the energy is moderate. But the cross-onshore wind is making it a total chop fest. Water temp is about normal for the season.
The size really starts building by Sunday the 10th, with waves around 6 feet, and it keeps climbing into the second week. By Saturday the 16th of August, we’re looking at 6- to 7-foot waves, and the energy is getting strong. By Monday the 18th, it’s pushing 8-foot, and by Tuesday the 19th, we top out at 10-foot surf from the east-northeast. That’s a lot of water moving, and the energy is strong—over 1300.
But every single time, the wind is wrong. It’s either cross or cross-onshore. For a surfer, that means the waves are blown out, lumpy, and hard to ride. At that 10-foot size with that chop, this setup is way more fun for a kite surfer than a paddle surfer. It’s too powerful and messy.
There’s one moment on the 16th and 17th where the forecast nudges up to a “marginal” call, but it’s still cross-shore wind. Even right at the end, on Thursday the 21st, we’ve got 7-foot waves but the wind is finally just a little more north—still not the clean offshore we need.
So, no standout days. Kahului Harbor is a no-go for the whole stretch.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Fri morning, min 24°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun afternoon. Warm (max 27°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
AM | 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 9 | ENE 9 | NE 8 | ENE 8 | ENE 8 | ENE 4 | ENE 7 | ENE 5 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 193 | 194 | 100 | 172 | 131 | 28 | 102 | 73 | 104 | 143 | 225 | 255 | 356 | 384 | 310 | 244 | 234 | 252 | 222 | 245 | 183 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | cross-on | cross | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross |
High Tide | 8:17AM0.53m | 4:59PM0.52m | 10:35AM0.60m | 11:51AM0.70m | 12:37PM0.79m | 10:03PM0.34m | 1:16PM0.86m | 11:50PM0.37m | 1:52PM0.90m | 00:51AM0.42m | 2:25PM0.92m | 1:42AM0.48m | |||||||||
Low Tide | 12:37PM0.46m | 1:32AM0.06m | 2:47AM0.04m | 4:09AM0.00m | 8:44PM0.33m | 5:19AM-0.05m | 8:26PM0.30m | 6:16AM-0.09m | 8:41PM0.26m | 7:05AM-0.11m | 9:02PM0.23m | ||||||||||
 | |  | |  |  | | | | | | | |  |  | | | | | | | |
 | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 27 | 26 | 26 | 27 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 28 | 28 | 26 | 27 | 27 | 26 | 28 | 27 | 28 | 28 | 27 | 25 | 27 | 27 | 26 | 29 | 28 | 27 | 28 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | NNE 9 | NNE 8 | NE 8 | N 8 | NNW 8 | ENE 7 | NNW 7 | NNW 7 | NE 11 | NE 10 | N 6 | NE 9 | WSW 17 | WSW 16 | NNW 10 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | W 13 |
| kJ | 8 | 7 | 100 | 5 | 7 | 21 | 10 | 5 | 18 | 24 | 3 | 14 | 27 | 26 | 20 | 17 | 16 | 13 | 12 | 6 | 13 |
Swell 2 Height (m) Direction Period (s) | W 12 | W 12 | NNE 8 | W 11 | NNW 8 | NNW 8 | W 11 | NE 12 | NNW 7 | N 7 | WSW 18 | WSW 18 | W 12 | W 11 | W 11 | W 11 | W 11 | W 10 | W 10 | W 10 | NNW 8 |
| kJ | 11 | 11 | 6 | 10 | 6 | 11 | 9 | 23 | 5 | 3 | 31 | 30 | 12 | 10 | 10 | 9 | 9 | 8 | 8 | 8 | 6 |
Swell 3 Height (m) Direction Period (s) | SW 16 | SW 16 | W 12 | NW 8 | W 12 | NE 11 | SW 14 | SW 20 | WSW 19 | WSW 18 | SW 13 | N 6 | N 8 | N 11 | WSW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 19 |
| kJ | 10 | 10 | 11 | 3 | 11 | 5 | 8 | 15 | 37 | 33 | 7 | 3 | 1 | 10 | 25 | 10 | 10 | 9 | 8 | 8 | 15 |
Wind waves Height (m) Direction Period (s) | ENE 9 | ENE 9 | E 3 | ENE 8 | ENE 8 | ENE 4 | ENE 7 | ENE 5 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 193 | 194 | 2 | 172 | 131 | 28 | 102 | 73 | 104 | 143 | 225 | 255 | 356 | 384 | 310 | 244 | 234 | 252 | 222 | 245 | 183 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 18 | 4 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 18 | 12 | 12 | 12 | 12 | 12 | 18 | 12 | 12 | 18 |
Best forecast wave conditions in Maui | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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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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