Surf Forecasts:
Kahului Harbor surf forecast from 15 Aug 2026:
- Best quality surf: Saturday 15 Aug, 11AM (local time) - 10ft (3.0m), 11s period, E swell with cross-shore winds.
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 11ft (3.5m), 10s period, E swell with 2,633 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 11AM (local time) - 10ft (3.0m), 11s 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 11AM. The primary swell is predicted to be 3.0m and 11s period with a secondary swell of 0.2m and 8s. 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 3.5m 10s and forecast to arrive on Sunday (Aug 16) at 2AM. 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 12s period and expected on Friday (Aug 14) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Sat 15th Aug) | 10ft (3.0m) 11s |
| Best Surf | 11AM (Sat 15th Aug) | 10ft (3.0m) 11s |
| Most Powerful | 2AM (Sun 16th Aug) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Kahului Harbor over the next 16 days.
The Lowdown
Alright, surfers, Rusty here with a look at what’s on the cards for our local waters. Honestly, it’s a pretty quiet stretch ahead, so we’re going to have to be patient.
The forecast starts with us on the back foot. For the first week and a half, there’s nothing really worth paddling out for. The whole setup is dominated by a persistent ENE wind flow that keeps things messy and cross-onshore, with the swell energy fluctuating between weak and moderate at best. The water temp is sitting at 80°F, which is about average for this time of year, so no surprises there.
The first real standout doesn’t show up until the end of the run. On Thursday, 27 August and Friday, 28 August, things get interesting. We’ve got a long-period groundswell creeping in from the east, with a period hitting 16 to 17 seconds. That’s serious energy, with combined swell energy jumping to 1279 (strong) and 1065 (strong) respectively. The wave height is only around 4 ft, but that long period means those waves will have some real punch and shape. The wind is light and cross or cross-on, so it’s not glassy, but it’s manageable. This is a classic setup for a reef like Kahului Harbor (Maui) – that long period tends to wrap in nicely and offer up some lined-up walls. Just keep in mind, with a long period swell like this, the sets will be spaced out, so paddling out won’t be as hectic. The swell direction is out of the east, which is a good match for the exposed reef there.
The best window is probably Friday morning, 28 August, with light cross-shore winds and a solid 4 ft, 16-second swell. It’s not a massive day, but given the long flat spell we’ve had, this is the one to aim for. The best on offer is definitely that Friday morning session, but don’t expect perfection—tides might be a little tricky, so pick your timing.
Beyond that, we trickle back into smaller, weaker swell and onshore winds, so it’s a short-lived window. If you’re keen, pencil in that last week of August.
Rusty.
Short Range ForecastHeavy rain (total 36mm), heaviest during Sat night. Warm (max 27°C on Fri morning, min 24°C on Sat night). Winds decreasing (near gales from the ENE on Sat night, light winds from the E by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Mon morning, min 24°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | |||||||||||||||
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 8 | ENE 10 | E 12 | E 11 | E 10 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 7 | ENE 7 | E 8 |
Wave Graph | |||||||||||||||||||||
567 | 1082 | 2134 | 2062 | 1975 | 2633 | 973 | 645 | 406 | 268 | 228 | 147 | 159 | 155 | 140 | 167 | 168 | 93 | 108 | 157 | 80 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 3:50PM0.81m | 3:59AM0.57m | 4:12PM0.73m | 4:46AM0.57m | 4:28PM0.65m | 5:39AM0.56m | 4:37PM0.58m | 6:48AM0.54m | 4:30PM0.52m | 8:48AM0.54m | 11:15AM0.58m | ||||||||||
Low Tide | 9:10AM0.02m | 10:16PM0.13m | 9:48AM0.11m | 10:40PM0.12m | 10:26AM0.22m | 11:05PM0.11m | 11:04AM0.32m | 11:30PM0.11m | 11:51AM0.42m | 11:59PM0.12m | 00:42AM0.14m | 2:05AM0.15m | |||||||||
6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | |
mm | — | — | 4 | 4 | 1 | 16 | 2 | 1 | 8 | — | — | — | — | — | — | — | — | — | — | 2 | — |
Temp °C | 27 | 27 | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 27 | 25 | 25 | 26 | 24 | 27 | 29 | 28 | 27 | 27 | 26 | 27 | 27 | 26 | 28 | 28 | 26 | 28 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | NNW 8 | NNW 8 | NNW 8 | NNW 8 | W 11 | W 13 | W 12 | W 12 | WNW 11 | W 11 | W 11 | E 9 | WSW 17 | WSW 18 | ENE 8 | NNE 7 | W 12 | NNE 7 | NNE 7 | WSW 18 | E 8 |
6 | 6 | 6 | 7 | 10 | 14 | 11 | 11 | 13 | 10 | 10 | 14 | 28 | 30 | 140 | 9 | 11 | 41 | 40 | 30 | 80 | |
Swell 2 Height (m) Direction Period (s) | W 12 | W 12 | W 11 | W 11 | SW 16 | NNW 9 | NNW 9 | NNW 8 | N 8 | N 8 | N 8 | W 11 | W 11 | W 13 | W 12 | W 12 | WSW 16 | WSW 16 | WSW 18 | W 11 | NNE 7 |
11 | 11 | 10 | 9 | 10 | 7 | 7 | 7 | 5 | 5 | 1 | 10 | 2 | 14 | 11 | 11 | 27 | 26 | 30 | 9 | 40 | |
Swell 3 Height (m) Direction Period (s) | SW 15 | S 14 | SW 17 | S 14 | — | — | SW 19 | SW 16 | SW 5 | W 18 | W 19 | N 7 | W 13 | W 11 | N 8 | WSW 16 | NW 10 | W 11 | W 11 | NW 9 | WSW 16 |
8 | 4 | 12 | 4 | — | — | 14 | 10 | 1 | 6 | 7 | 1 | 3 | 2 | 1 | 27 | 4 | 10 | 9 | 3 | 27 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 10 | E 12 | E 11 | E 10 | E 10 | E 9 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | — | ENE 8 | ENE 8 | E 8 | E 7 | ENE 7 | — |
567 | 1082 | 2134 | 2062 | 1975 | 2633 | 973 | 645 | 406 | 268 | 228 | 147 | 159 | 155 | — | 167 | 168 | 93 | 108 | 157 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 18 | 143 | 19 | 18 | 348 | 12 | 20 | 12 | 12 | 12 | 12 | 4 | 12 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
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.











