Surf Forecasts:
Waimanalo surf forecast from 27 Aug 2026:
- Most powerful swell: Wednesday 2 Sep, 11PM (local time) - 7ft (2.1m), 8s period, ENE swell with 563 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.1m 8s and forecast to arrive on Wednesday (Sep 02) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 17s period and expected on Thursday (Aug 27) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Wed 2nd Sep) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s have a look at what’s cookin’ for Waimanalo.
Honestly, the whole 16-day window is a straight-up write-off for decent surfing. There’s not a single good session in the mix. The swell is there, sure, but the wind absolutely kills it. We’re lookin’ at a solid run of poor surf conditions from now all the way through to the 11th of September.
The water’s sittin’ at about 81°, which is pretty much average for this time of year, so that’s not the problem. The problem is that relentless ENE wind. It blows onshore or cross-onshore almost the entire time, from 16 mph right up to a nasty 31 mph. That’s gonna chop everything to pieces. Even when the swell ticks up around the 4th and 5th of September, with the swell period stretchin’ out to 11 seconds and the combined energy climbin’ into the strong range, the wind is still fresh onshore. That’s just frustration in the lineup.
There’s a brief moment on the afternoon of the 11th of September where the wind goes cross-off and clean, but by then the swell has dropped to 6ft with a short 7-second period, and combined energy is only 349 – just not enough push to light it up.
So, no standout sessions, no hidden gems. This is just one of those blank runs where the tradewinds have the place on lock. Forecasts can always shift, but for now, leave the board at home.
- Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Sat morning, min 25°C on Thu morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Sun afternoon, min 25°C on Sun morning). Mainly fresh winds. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 155 | 165 | 200 | 145 | 146 | 212 | 207 | 268 | 336 | 293 | 338 | 286 | 387 | 459 | 532 | 559 | 500 | 476 | 434 | 423 | 354 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | on | on | on | on | cross-on | cross-on | on | cross-on |
High Tide | 2:57PM0.65m | 2:22AM0.43m | 3:14PM0.63m | 3:05AM0.46m | 3:30PM0.60m | 3:52AM0.48m | 3:45PM0.56m | 4:44AM0.51m | 3:57PM0.51m | 5:44AM0.52m | 4:04PM0.47m | 7:03AM0.52m | 3:54PM0.43m | ||||||||
Low Tide | 9:08PM0.15m | 8:18AM0.02m | 9:29PM0.12m | 8:54AM0.07m | 9:52PM0.09m | 9:33AM0.13m | 10:17PM0.05m | 10:16AM0.20m | 10:46PM0.03m | 11:06AM0.27m | 11:19PM0.02m | 12:22PM0.33m | 00:03AM0.02m | ||||||||
 | |  | | | | | | | | | | | | | | |  |  | |  | |
 | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 22 | 22 | 22 | 23 | 22 | 21 | 23 | 22 | 22 | 22 | 23 | 22 | 22 | 24 | 23 | 25 | 25 | 26 | 26 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | S 17 | S 17 | S 16 | S 15 | S 14 | E 14 | E 13 | E 12 | E 12 | ENE 11 | S 12 | ENE 11 | S 11 | S 11 | S 10 | SSW 18 | SSW 18 | SSW 17 | S 16 | ESE 10 | E 10 |
| kJ | 214 | 143 | 121 | 104 | 100 | 146 | 126 | 77 | 75 | 43 | 25 | 37 | 21 | 20 | 8 | 107 | 63 | 97 | 83 | 78 | 200 |
Swell 2 Height (m) Direction Period (s) | N 8 | NNE 8 | NNE 7 | E 16 | E 15 | S 14 | S 13 | S 13 | S 12 | S 12 | SSW 15 | S 11 | SSW 15 | SSW 14 | S 19 | S 10 | S 12 | E 13 | E 16 | S 16 | E 14 |
| kJ | 12 | 13 | 9 | 78 | 104 | 60 | 54 | 54 | 26 | 25 | 23 | 21 | 21 | 20 | 30 | 7 | 11 | 14 | 75 | 79 | 142 |
Swell 3 Height (m) Direction Period (s) | SSW 12 | SSW 12 | E 17 | NNE 6 | NW 8 | NW 8 | SW 18 | SW 17 | SSW 17 | SSW 16 | S 16 | SSW 15 | S 21 | S 19 | SW 14 | SW 14 | E 15 | S 10 | ESE 11 | E 15 | S 15 |
| kJ | 14 | 14 | 24 | 8 | 3 | 3 | 12 | 12 | 28 | 26 | 5 | 22 | 8 | 29 | 7 | 8 | 17 | 8 | 40 | 69 | 69 |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 155 | 165 | 200 | 145 | 146 | 212 | 207 | 268 | 336 | 293 | 338 | 286 | 387 | 459 | 532 | 559 | 500 | 476 | 434 | 423 | 354 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 45 | 55 | 45 | 44 | 116 | 44 | 50 | 52 | 50 | 50 | 52 | 44 | 50 | 45 | 15 | 44 | 50 | 15 | 44 | 44 | 15 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Waimanalo Surf forecast
The above surf forecast table for Waimanalo provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Waimanalo can be found by selecting the local surf guide option on the grey menu. Our Waimanalo 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 (Waimanalo) 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 Waimanalo 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.
Waimanalo is 7 km (4 miles) from Kailua. If you plan a vacation in Oahu, look for hotels and other accommodation in Kailua. Kailua has rooms for a wide range of budgets as well as car hire and transport links.
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