Surf Forecasts:
Kahului Harbor surf forecast from 8 Aug 2026:
- Best quality surf: Saturday 15 Aug, 5AM (local time) - 20ft (6.0m), 15s period, E swell with cross-shore winds.
- Most powerful swell: Saturday 15 Aug, 8AM (local time) - 25ft (7.5m), 14s period, E swell with 21,363 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 5AM (local time) - 20ft (6.0m), 15s period with E swell.
Best Forecast Surf Conditions for Kahului Harbor this week:
The surf forecast for Kahului Harbor over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 15) at 5AM. The primary swell is predicted to be 6.0m and 15s period. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Kahului Harbor in the next 16 days are 7.5m 14s and forecast to arrive on Saturday (Aug 15) at 8AM. 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 19s period and expected on Saturday (Aug 08) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sat 15th Aug) | 20ft (6.0m) 15s |
| Best Surf | 5AM (Sat 15th Aug) | 20ft (6.0m) 15s |
| Most Powerful | 8AM (Sat 15th Aug) | 25ft (7.5m) 14s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at the stretch ahead for us here. Let’s get into it.
Honestly, folks, it’s a rough start. The first week and a half is pretty much a write-off for decent surf. From Saturday the 8th all the way through to Thursday the 14th, it’s just poor surf conditions day after day at Kahului Harbor. The wind is mostly cross or cross-on, the swell is short-period and messy, and the wave energy is weak to moderate (values between 152 and 377). Nothing to get excited about. You’d be fighting a chop for no reward.
Then things get wild. On Friday the 14th, the swell starts to build but it’s still no good for surfing – the wind is up, 22 to 25 mph, making it a lumpy, messy cross-chop. The energy jumps to 980 and then 1976, but it’s just not clean.
But hold on. Saturday the 15th of August is the one that’s got my heart racing. The forecast shows a proper, long-period groundswell hitting. We’re talking about 28 ft swell from the east with a period of 14 seconds, and the combined energy is a massive 27557. That’s serious power. The wind is forecast to be cross, and the notes say wind and tide are favorable, but here’s the catch – and it’s a big one – the swell is just too big for this break. If you’re an expert and you know Kahului Harbor well, this could be the session of the year, but it’s a real expert-only proposition. The water temp is about 80°F, which is pretty average for the time of year, nothing unusual there.
Sunday the 16th is a major drop-off. The swell is still a solid 7 ft to 7 ft but the energy is down to 603-775, and the conditions are only marginal. The rest of the run, from the 17th through the 23rd, slides back into that poor, choppy, cross-on slop we saw at the start. Nothing to recommend.
So, the one true standout is Saturday, August 15th. A massive, powerful groundswell with a very long period (14 seconds). It’s a rare event for the area, but it’s also a break that rarely gets this kind of size. For the experts, it’s the best on offer, but it’s not for the faint of heart. The rest of the window is a long, flat slog.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 28°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue morning, min 24°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 11 | E 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 149 | 162 | 204 | 253 | 353 | 287 | 272 | 240 | 234 | 228 | 228 | 186 | 173 | 151 | 183 | 227 | 265 | 468 | 980 | 1976 | 12451 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross | cross |
High Tide | 12:37PM0.79m | 10:03PM0.34m | 1:16PM0.86m | 11:50PM0.37m | 1:52PM0.90m | 00:51AM0.42m | 2:25PM0.92m | 1:42AM0.48m | 2:56PM0.91m | 2:28AM0.52m | 3:25PM0.87m | 3:13AM0.55m | 3:50PM0.81m | 3:59AM0.57m | |||||||
Low Tide | 8:44PM0.33m | 5:19AM-0.05m | 8:26PM0.30m | 6:16AM-0.09m | 8:41PM0.26m | 7:05AM-0.11m | 9:02PM0.23m | 7:50AM-0.10m | 9:26PM0.19m | 8:31AM-0.06m | 9:51PM0.16m | 9:10AM0.02m | 10:16PM0.13m | ||||||||
 | |  | |  |  | | | | | | | | | | | |  |  | | | |
 | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — |
mm | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 26 | 26 | 27 | 27 |
Feels °C | 28 | 28 | 26 | 29 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 25 | 27 | 27 | 25 | 26 | 26 | 25 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | N 7 | N 6 | NE 9 | WSW 17 | NNW 11 | NNW 10 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | W 13 | W 12 | W 12 | SW 16 | ESE 12 | W 12 | W 12 | — |
| kJ | 3 | 3 | 22 | 27 | 24 | 20 | 16 | 16 | 13 | 12 | 6 | 5 | 5 | 13 | 11 | 11 | 10 | 29 | 3 | 3 | — |
Swell 2 Height (m) Direction Period (s) | WSW 18 | WSW 18 | WSW 18 | W 12 | WSW 16 | NE 9 | W 11 | W 10 | W 10 | W 10 | W 10 | W 11 | W 10 | NW 7 | NW 7 | N 7 | W 12 | NW 8 | S 15 | S 14 | — |
| kJ | 33 | 31 | 30 | 11 | 26 | 12 | 9 | 8 | 8 | 8 | 8 | 9 | 9 | 2 | 2 | 1 | 11 | 3 | 4 | 4 | — |
Swell 3 Height (m) Direction Period (s) | SW 14 | SW 13 | N 6 | N 12 | W 11 | W 11 | NNE 8 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 18 | SW 18 | SW 16 | SW 16 | NW 7 | W 12 | W 18 | W 17 | — |
| kJ | 8 | 7 | 3 | 3 | 10 | 9 | 7 | 10 | 9 | 9 | 8 | 7 | 12 | 12 | 11 | 10 | 2 | 3 | 6 | 6 | — |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 11 | E 15 |
| kJ | 149 | 162 | 204 | 253 | 353 | 287 | 272 | 240 | 234 | 228 | 228 | 186 | 173 | 151 | 183 | 227 | 265 | 468 | 980 | 1976 | 12451 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 12 | 12 | 12 | 12 | 18 | 12 | 12 | 18 | 12 | 12 | 18 | 12 | 12 | 18 | 18 | 18 | 18 | 18 | 131 | 131 | 19 |
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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