Surf Forecasts:
Waimanalo surf forecast from 29 Aug 2026:
- Most powerful swell: Tuesday 1 Sep, 8PM (local time) - 7ft (2.1m), 8s period, ENE swell with 555 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 Tuesday (Sep 01) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 14s period and expected on Saturday (Aug 29) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Tue 1st Sep) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
G'day, I'm Rusty, and I'm looking at the surf for Waimanalo. Right now, the water temp is about average for this time of year, so nothing weird there. But I gotta be straight with you – the next couple of weeks look pretty grim for a decent paddle. The wind is just howling out of the east-northeast, hammering this exposed stretch of coast with onshore and cross-onshore winds that are making a mess of things. The swell is coming from the same direction as the wind, which is a recipe for lumpy, choppy, and just plain poor conditions. The energy is moderate, with combined swell readings sitting around 300 to 500, but it's all short-period, wind-driven junk of about 6 to 8 seconds, so there's no real power or shape to it.
We've got a solid run of 'poor surf conditions' flagged from the start through to the 9th of September. The wind is relentless, a fresh breeze of 30 to 35 km/h, making it feel like a battle just to get out. The swell sits around 6 ft to 7 ft, but it's all rubbish. Honestly, this setup looks more interesting for kite surfing than paddle surfing, with that strong onshore flow and some size.
There's a brief glimmer of a change on the 10th of September, with the wind dropping to a light breeze, but the swell is still that short-period, cross-onshore junk. It's a marginal improvement, but still a pass. Then, on the 7th and 8th of September, the swell actually jumps up to a solid 8 ft to 10 ft, and the energy readings go through the roof – over 1000! But it's still a messy onshore wind, and the period is short, so it's going to be a big, bumpy, and unruly mess. That's expert-only territory, and even then, it won't be pretty.
The only blip of hope is on the 10th of September, mentioned as 'marginal.' The wind swings light, but the swell is still short and cross-onshore from the ENE. It's a 6 ft swell with 7-second period, so it's not going to be anything special. The rest of the window into the 13th of September just stays poor, with the wind picking up again. For a break that's 'fairly consistent' and usually gets some good NE swell, this is a real quiet spell. Sometimes it's just like that.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sun night. Warm (max 26°C on Sat morning, min 25°C on Fri night). Mainly strong winds. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Tue afternoon. Warm (max 26°C on Tue afternoon, min 25°C on Mon night). Mainly fresh winds. | ||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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 | 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 7 | ENE 8 | E 12 | E 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 188 | 252 | 233 | 394 | 325 | 362 | 285 | 376 | 423 | 471 | 441 | 541 | 496 | 384 | 362 | 379 | 322 | 196 | 161 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | on | on | on | on | cross-on | on | on | on | cross-on | on | on |
High Tide | 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 | 9:02AM0.54m | ||||||||
Low Tide | 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 | 1:10AM0.03m | |||||||
 |  |  | | | |  | | |  | |  | | | | | | | | |
 | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 6:50 | — | 6:49 | — | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | 1 | — | — | — | — | 1 | 3 | — | — | 2 | — | — | — |
Temp °C | 25 | 26 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 22 | 23 | 22 | 22 | 23 | 23 | 22 | 24 | 24 | 22 | 23 | 24 | 23 | 25 | 25 | 23 | 22 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | E 14 | E 13 | E 12 | E 12 | ENE 11 | S 12 | ENE 10 | S 11 | S 10 | SSW 19 | SSW 18 | SSW 18 | S 17 | S 16 | S 16 | S 15 | E 13 | E 12 | E 12 |
| kJ | 146 | 126 | 77 | 75 | 43 | 25 | 37 | 21 | 19 | 74 | 107 | 107 | 93 | 130 | 79 | 69 | 84 | 196 | 103 |
Swell 2 Height (m) Direction Period (s) | S 14 | S 13 | S 13 | S 12 | S 12 | SSW 15 | S 11 | SSW 15 | SSW 14 | S 10 | S 9 | S 12 | S 10 | S 10 | E 12 | E 13 | S 14 | S 14 | N 6 |
| kJ | 93 | 54 | 54 | 26 | 25 | 23 | 22 | 21 | 21 | 18 | 7 | 11 | 8 | 8 | 27 | 51 | 65 | 60 | 19 |
Swell 3 Height (m) Direction Period (s) | NW 8 | SW 18 | SW 17 | SSW 17 | SSW 16 | S 16 | SSW 15 | S 21 | S 19 | SW 14 | SW 14 | E 15 | E 14 | E 13 | S 10 | S 11 | S 10 | SSE 10 | S 13 |
| kJ | 3 | 12 | 12 | 28 | 26 | 5 | 22 | 8 | 29 | 7 | 8 | 4 | 14 | 14 | 8 | 21 | 18 | 10 | 56 |
Wind waves Height (m) Direction Period (s) | 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 7 | ENE 8 | ENE 7 | E 8 |
| kJ | 188 | 252 | 233 | 394 | 325 | 362 | 285 | 376 | 423 | 471 | 441 | 541 | 496 | 384 | 362 | 379 | 322 | 181 | 161 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 44 | 50 | 52 | 57 | 50 | 50 | 44 | 45 | 52 | 44 | 44 | 116 | 44 | 44 | 56 | 44 | 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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