Surf Forecasts:
Kahana Bay surf forecast from 8 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 2PM (local time) - 6ft (1.8m), 11s period, ENE swell with offshore winds.
- Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 7ft (2.2m), 12s period, ENE swell with 1,302 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 2PM (local time) - 6ft (1.8m), 11s period with ENE swell.
Best Forecast Surf Conditions for Kahana Bay this week:
The surf forecast for Kahana Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 2PM. The primary swell is predicted to be 1.8m and 11s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Kahana Bay in the next 16 days are 2.2m 12s and forecast to arrive on Tuesday (Sep 08) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 7s period and expected on Tuesday (Sep 08) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Tue 8th Sep) | 6ft (1.8m) 11s |
| Best Surf | 2PM (Tue 8th Sep) | 6ft (1.8m) 11s |
| Most Powerful | 2AM (Tue 8th Sep) | 7ft (2.2m) 12s |
Table - best surf conditions forecast for Kahana Bay over the next 16 days.
The Lowdown
Alright, let’s talk surf. It’s been flat and messy here at Kahana Bay for a while, and honestly, that’s not changing anytime soon. We’ve got a long stretch of small, weak waves ahead before anything with a bit of push shows up.
Right now, on Monday afternoon, it’s ugly. There’s a storm risk, wind is blowing 22 mph cross-shore, and it’s making a mess of that 8ft of short-period, 7-second wind swell. The energy is moderate (800), but it’s lumpy and chopped up. Forget surfing, this looks more like a kiting day. Water temp is 80°, which is about normal for this time of year.
The surf stays poor through the rest of the week. Tuesday morning cleans up with a fresh offshore wind and 6ft of longer-period, 11-second swell from the ENE. The energy is still moderate (884), and it’s looking marginal, but it’s the best we’ll see for days. Tuesday afternoon eases to 6ft with a moderate offshore wind and clean conditions. It’s not great, but if you’re keen for a paddle, that’s your window. Wednesday through Friday is a write-off—the swell drops, the wind goes onshore, and it’s back to being small and lumpy.
The weekend is weak too. Saturday and Sunday have waves in the 2ft to 3ft range with light cross and cross-onshore winds. It’s messy and weak. Nothing to get excited about.
There is a pulse of north-northwest groundswell coming around the 17th and 18th. The period stretches out to 12-13 seconds, which is proper swell, but the size is still only 3ft to 4ft. The energy jumps to a moderate 485 on the 17th afternoon, but it’s still not enough to get the heart racing, and the wind is cross-shore, making it marginal at best.
So, the truth is, there’s nothing that stands out as a proper session in the entire 16-day window. We’re looking at a long gap of small, weak surf. The breaks are inconsistent, so this blank run is pretty much the norm for this area. It won’t stay this bad forever, but right now, you’re better off waiting. Keep an eye on that NNW groundswell near the end of the second week—it has potential, but it’s a long way out, and the wind has to play nice. For now, be patient.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Mon night. Warm (max 29°C on Tue afternoon, min 25°C on Wed night). Winds decreasing (strong winds from the SE on Mon night, calm by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | E 13 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | NE 8 | NE 8 | NE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 800 | 1302 | 870 | 711 | 378 | 211 | 168 | 269 | 276 | 240 | 162 | 108 | 297 | 250 | 160 | 160 | 141 | 72 | 72 | 74 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | off | off | off | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 11:50PM0.45m | 1:11PM0.90m | 00:39AM0.53m | 1:37PM0.87m | 1:24AM0.59m | 2:00PM0.83m | 2:09AM0.65m | 2:19PM0.77m | 2:53AM0.68m | 2:34PM0.70m | 3:38AM0.70m | 2:46PM0.64m | 4:24AM0.70m | |||||||
Low Tide | 7:46PM0.26m | 6:11AM-0.02m | 7:58PM0.23m | 6:56AM-0.01m | 8:15PM0.18m | 7:38AM0.04m | 8:34PM0.14m | 8:19AM0.10m | 8:55PM0.10m | 9:00AM0.18m | 9:17PM0.06m | 9:41AM0.27m | 9:39PM0.05m | |||||||
 |  |  | |  | |  |  |  | |  | | | | | | | | | | |
 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — |
mm | 4 | 8 | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 28 | 29 | 27 | 28 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 25 | 28 | 29 | 31 | 32 | 30 | 28 | 26 | 27 | 26 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | SW 15 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | ENE 8 | E 13 | E 12 | E 12 | E 11 | E 11 | NNE 8 | ENE 8 | ENE 10 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 |
| kJ | 171 | 1302 | 870 | 711 | 378 | 211 | 117 | 117 | 104 | 103 | 94 | 88 | 39 | 207 | 160 | 75 | 75 | 72 | 72 | 74 |
Swell 2 Height (m) Direction Period (s) | S 9 | SW 14 | SSW 15 | S 9 | E 14 | E 13 | E 13 | NW 8 | NW 7 | NW 9 | SSW 16 | NNE 8 | SSW 15 | SSW 15 | NE 8 | SW 16 | SSW 13 | ENE 9 | ENE 9 | ENE 8 |
| kJ | 39 | 834 | 75 | 122 | 132 | 168 | 168 | 15 | 14 | 21 | 26 | 26 | 22 | 22 | 70 | 10 | 17 | 46 | 26 | 55 |
Swell 3 Height (m) Direction Period (s) | SSW 17 | NNW 12 | NNW 12 | E 14 | NW 9 | NW 8 | NW 8 | NW 10 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | NW 8 | SSW 12 | SSW 16 | SW 13 | NW 15 | SSW 15 | SW 15 | SSW 14 |
| kJ | 93 | 14 | 14 | 97 | 50 | 33 | 32 | 33 | 33 | 32 | 14 | 26 | 2 | 13 | 24 | 7 | 8 | 21 | 8 | 20 |
Wind waves Height (m) Direction Period (s) | E 7 | SSE 7 | S 10 | — | — | — | ENE 3 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 10 | — | ENE 10 | ENE 9 | E 5 | E 5 | — |
| kJ | 800 | 607 | 408 | — | — | — | 3 | 269 | 276 | 240 | 162 | 108 | 297 | 250 | — | 160 | 141 | 27 | 17 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 140 | 143 | 157 | 0 | 0 | 20 | 22 | 22 | 22 | 30 | 30 | 22 | 22 | 22 | 21 | 22 | 22 | 22 | 22 | 22 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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Information about the Kahana Bay Surf forecast
The above surf forecast table for Kahana Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kahana Bay can be found by selecting the local surf guide option on the grey menu. Our Kahana Bay 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 (Kahana Bay) 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 Kahana Bay 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.
Kahana Bay is 17 km (11 miles) from Wahiawa. If you plan a vacation in Oahu, look for hotels and other accommodation in Wahiawa. Wahiawa has rooms for a wide range of budgets as well as car hire and transport links.
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