Surf Forecasts:
Waimanalo surf forecast from 30 Aug 2026:
- Most powerful swell: Saturday 5 Sep, 11AM (local time) - 10ft (3.0m), 8s period, ENE swell with 1,073 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 3.0m 8s and forecast to arrive on Saturday (Sep 05) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 10s period and expected on Sunday (Sep 06) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sat 5th Sep) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s on the cards for the next couple of weeks.
Right off the bat, I gotta be straight with you – this is a tough stretch for Waimanalo. The whole 16-day window is a write-off for anything you’d want to paddle out for. We’ve got a solid 10 or 11 days of straight up poor conditions right from the start. The issue is a relentless onshore wind from an ENE direction that just hammers the surf. We’re looking at swell sizes from 5ft up to 10ft, and while that might sound fun, the wind keeps it chopped, lumpy, or blown out. The water temp is about average for this time of year, nothing weird going on there.
It’s not until Wednesday the 9th of September that we see a change, and even then it’s a bit of a tease. The swell jumps up to a solid 10ft with a period of 10 seconds. The winds finally drop to a gentle breeze, so it’s not as messy, but the combined swell energy is pumping at 1708 – that’s strong stuff. The problem is, the scan says it’s actually too big for this break, so that one’s for the experts only, and even then it’ll be a beast. After that, there’s a little window on Thursday the 10th of September where the wind turns clean and offshore. Swell is 8ft coming from the ENE with an 8-second period. The combined energy is moderate at 924. The wind is a light cross-offshore, so conditions would be clean. But the verdict is that it’s a marginal forecast with questionable tides. After that, we’re back to onshore wind and small, weak surf for the rest of the run.
The standouts? Honestly, there’s none. The only day that gets close to being rideable is Thursday the 10th of September, if you’re desperate and the tides cooperate. The rest is a long, frustrating gap of straight-up poor conditions. For beginners, the swell is over 5ft on most days anyway, so it’s not a friendly stretch. With all that fresh onshore wind, the setup here is honestly more interesting for a kite surfer than someone with a paddle. Forecasts can always change, but as it looks now, I’d be finding something else to do for the next couple of weeks.
- Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Sun morning, min 25°C on Sat night). Mainly strong winds. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Wed night. Warm (max 26°C on Wed morning, min 25°C on Tue night). Mainly strong winds. | ||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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 | E 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 469 | 334 | 301 | 154 | 443 | 419 | 419 | 410 | 432 | 483 | 402 | 335 | 331 | 358 | 373 | 366 | 456 | 495 | 654 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | on | on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on |
High Tide | 3:52AM0.48m | 3:45PM0.56m | 4:44AM0.51m | 3:57PM0.51m | 5:44AM0.52m | 4:04PM0.47m | 7:03AM0.52m | 3:54PM0.43m | 9:02AM0.54m | 10:54AM0.59m | |||||||||
Low Tide | 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 | 1:10AM0.03m | 2:48AM0.04m | ||||||||
 |  | |  | | | | | | | | |  |  | | |  | | | |
 | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — |
 | 6:49 | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 25 | 25 | 25 | 26 | 26 | 26 |
Feels °C | 21 | 23 | 23 | 22 | 22 | 24 | 22 | 24 | 24 | 22 | 25 | 24 | 25 | 21 | 21 | 21 | 22 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | E 12 | ENE 11 | ENE 11 | NNE 7 | S 11 | S 10 | S 10 | SSW 18 | SSW 18 | S 17 | S 16 | S 16 | E 13 | E 13 | E 12 | E 12 | E 14 | E 14 | E 13 |
| kJ | 75 | 43 | 40 | 96 | 21 | 19 | 18 | 107 | 107 | 93 | 130 | 79 | 85 | 119 | 72 | 69 | 229 | 229 | 222 |
Swell 2 Height (m) Direction Period (s) | S 12 | S 12 | S 12 | ENE 10 | SSW 15 | SSW 14 | S 19 | S 10 | S 12 | S 10 | E 14 | E 14 | S 15 | S 14 | S 14 | E 15 | S 13 | S 13 | S 13 |
| kJ | 26 | 25 | 25 | 37 | 22 | 21 | 30 | 7 | 11 | 8 | 33 | 66 | 68 | 65 | 60 | 68 | 55 | 55 | 30 |
Swell 3 Height (m) Direction Period (s) | SSW 17 | SSW 16 | SSW 15 | S 11 | S 21 | S 19 | SSW 14 | SW 14 | E 15 | E 14 | S 10 | S 10 | S 11 | S 10 | S 10 | S 14 | S 21 | N 13 | NNE 12 |
| kJ | 28 | 26 | 23 | 22 | 8 | 29 | 18 | 8 | 4 | 14 | 8 | 8 | 21 | 18 | 8 | 57 | 9 | 3 | 13 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
| kJ | 469 | 334 | 301 | 154 | 443 | 419 | 419 | 410 | 432 | 483 | 402 | 335 | 331 | 358 | 373 | 366 | 456 | 495 | 654 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 57 | 50 | 56 | 44 | 50 | 50 | 44 | 44 | 116 | 44 | 44 | 50 | 44 | 50 | 120 | 46 | 118 | 211 | 146 |
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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