Surf Forecasts:
Kahului Harbor surf forecast from 25 Aug 2026:
- Most powerful swell: Monday 31 Aug, 2PM (local time) - 6ft (1.9m), 8s period, NE swell with 511 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 8s and forecast to arrive on Monday (Aug 31) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 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 | 2PM (Mon 31st Aug) | 6ft (1.9m) 8s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright team, Rusty here with the lowdown on Kahului Harbor. Got to level with you, it’s looking pretty grim for the next couple weeks.
Right from the start, there’s nothing doing. The first real look doesn't pop up until Monday, 31st August, and even that is a shaky call. From the 24th through the 30th, it’s all poor conditions. The wind is a messy cross or cross-onshore breeze out of the ENE at 9 to 16 mph. The swell is tiny and weak, running 4 to 6 ft from the E or ENE with a short period of only 7 to 8 seconds. Combined wave energy barely cracks 300-400 in that first week – that’s weak energy. Don’t bother.
Things perk up just a hair on Monday the 31st. The afternoon brings in some actual energy, with the swell hitting 7 ft out of the NE and the period stretching to 9 seconds. Combined energy jumps to 624 (moderate energy) – the best we’ll see. But the wind is still a cross-shore giving you cross-chop, and the report calls it marginal. The NE direction isn’t even the sweet spot for this advanced reef; it wants it from the NNE. So it’s a gamble.
Tuesday, 1st September, keeps that size around 7 ft with periods of 8-9 seconds and strong energy in the 500-600 range. But again, the wind stays cross-shore, keeping it lumpy. Still just a marginal call.
After that little blip, it's back to poor from the 2nd. The swell drops to 6 ft and smaller, the period is short again (7-8 seconds), and energy fades. By the 4th and 5th, the swell is a pathetic 2 ft, even if the period does hit 12 seconds – long period groundswell, but no power behind it. Wind stays cross-shore ruining the surface. The last few days from the 6th to the 8th are tiny, weak swells from weird directions like the NW, and no consistency.
So what’s the pick? The *only* window worth a thought is Monday afternoon, 31st August, through Tuesday, 1st September. It has the most size and energy, but don’t expect clean waves. It’s an advanced break that's very inconsistent, and with the cross-shore wind and off-direction swell, you’re better off waiting for a better forecast. For everyone else, it’s a 16-day dry spell. That’s just how it goes here sometimes.
- Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Mon afternoon. Warm (max 28°C on Mon morning, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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) | E 7 | E 8 | E 8 | E 8 | E 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 287 | 326 | 257 | 333 | 279 | 191 | 188 | 173 | 137 | 149 | 118 | 118 | 118 | 135 | 149 | 180 | 180 | 142 | 159 | 180 | 230 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 1:30PM0.77m | 00:25AM0.41m | 1:53PM0.80m | 1:02AM0.47m | 2:15PM0.81m | 1:38AM0.52m | 2:37PM0.81m | 2:14AM0.56m | 2:57PM0.80m | 2:52AM0.60m | 3:16PM0.76m | 3:32AM0.62m | 3:34PM0.71m | 4:17AM0.64m | |||||||
Low Tide | 8:07PM0.27m | 6:36AM0.01m | 8:19PM0.24m | 7:10AM-0.01m | 8:36PM0.21m | 7:42AM-0.01m | 8:55PM0.17m | 8:15AM0.02m | 9:15PM0.13m | 8:48AM0.07m | 9:38PM0.10m | 9:22AM0.14m | 10:01PM0.07m | ||||||||
 |  |  | | | | | | | | | | | |  | | | | | | | |
 | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — |
mm | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 27 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 25 | 27 | 26 | 25 | 26 | 27 | 25 | 27 | 27 | 26 |
Feels °C | 29 | 28 | 29 | 27 | 27 | 26 | 25 | 26 | 25 | 26 | 26 | 25 | 28 | 26 | 25 | 25 | 26 | 25 | 27 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | NW 11 | NW 11 | NW 10 | WNW 9 | WNW 10 | WNW 10 | WNW 9 | WNW 10 | NW 10 | NW 10 | NW 9 | NNE 7 | NNE 7 | E 14 | E 14 | E 13 | E 13 | E 12 | E 12 | E 11 | E 11 |
| kJ | 31 | 29 | 15 | 8 | 9 | 9 | 8 | 9 | 15 | 15 | 14 | 10 | 17 | 65 | 104 | 176 | 168 | 106 | 69 | 64 | 59 |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 18 | SW 17 | SW 16 | SW 16 | W 11 | W 11 | SW 18 | SW 16 | N 7 | N 8 | WNW 9 | E 14 | NNE 6 | NW 8 | NW 8 | NW 8 | WSW 17 | WSW 16 | WSW 16 | WSW 16 |
| kJ | 8 | 12 | 11 | 10 | 10 | 2 | 2 | 12 | 11 | 4 | 12 | 8 | 60 | 14 | 3 | 3 | 3 | 27 | 26 | 24 | 24 |
Swell 3 Height (m) Direction Period (s) | W 18 | SW 14 | SW 13 | W 12 | W 12 | SW 18 | SW 15 | W 10 | N 9 | SW 16 | SW 16 | E 15 | WNW 9 | WNW 9 | W 10 | SW 18 | SW 17 | NW 9 | NW 9 | NW 9 | NW 9 |
| kJ | 6 | 8 | 7 | 3 | 3 | 12 | 8 | 2 | 2 | 10 | 10 | 18 | 8 | 7 | 2 | 12 | 12 | 3 | 3 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | E 7 | E 8 | E 8 | E 8 | E 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 287 | 326 | 257 | 333 | 279 | 191 | 188 | 173 | 137 | 149 | 118 | 118 | 118 | 135 | 149 | 180 | 180 | 142 | 159 | 180 | 230 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 12 | 12 | 12 | 18 | 18 | 18 | 18 | 12 | 12 | 18 | 12 | 12 | 18 | 12 | 18 | 18 | 12 | 12 | 12 | 12 |
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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