Surf Forecasts:
Waimanalo surf forecast from 1 Sep 2026:
- Most powerful swell: Sunday 6 Sep, 5AM (local time) - 7ft (2.2m), 13s period, ENE swell with 1,630 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.2m 13s and forecast to arrive on Sunday (Sep 06) at 5AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 12s period and expected on Friday (Sep 04) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Sun 6th Sep) | 7ft (2.2m) 13s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's on the table for the next couple of weeks.
Honestly, it's a bit of a rough stretch for the first week. The predominant swell is pushing in from the ENE, but the wind is just hammering it onshore or cross-onshore with a fresh to strong breeze, making a mess of things. The wave energy is moderate to strong, but it's all wind-chop and won't be any fun on a paddle board. The period is short, around 7 to 8 seconds, so it's just wind swell. Forget about it for the first few days.
Things start to look a little more hopeful around the 7th of September. The wind drops to a moderate breeze on Monday, and the wave energy is still high, but it's described as marginal. It's not great, but it's a step up from the days before.
The real standout window is the 8th of September. Tuesday morning we're looking at a light breeze from the ESE, creating a cross-shore wind. That's the cleanest wind we've seen all forecast. The swell drops to 6ft from the ENE with a period of 10 seconds, and the combined energy is moderate. For Waimanalo, a beginner-friendly break, this is the best you're going to get. The water temperature is about average for this time of year. It's a surfable, clean wave, even if it's not the biggest. It's the one to point your car at.
After that, we slide back into poor conditions. The wind picks up again on the 9th and 10th, and the swell is short-period and messy. There's a long-period groundswell (13 seconds) pushing through on the 5th and 6th, but it's completely ruined by the onshore wind, making it a big, bumpy mess. No good for a point break or reef here, it's just a chore.
The second week is a write-off. The energy drops off significantly, with numbers way down. The swell is tiny, 1ft to 5ft, and the wind is either light or cross-onshore. There's a tiny window on the 15th and 16th with a clean cross-offshore wind, but the swell is practically non-existent at 2ft to 3ft from the NNW. It's a tease, not a session.
So, to sum it up: the first week is a washout. The one and only true standout is the morning of the 8th of September. Get on it if you can. The rest of the time? Leave the board in the car.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Warm (max 26°C on Mon night, min 25°C on Mon night). Mainly strong winds. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sat night. Warm (max 26°C on Fri morning, min 25°C on Thu night). Mainly strong winds. | ||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | ||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 7 | ENE 7 | ENE 7 | ENE 7 | E 14 | E 13 | ENE 13 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | ENE 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 439 | 441 | 483 | 527 | 525 | 536 | 574 | 478 | 595 | 671 | 500 | 426 | 413 | 1336 | 1445 | 1616 | 1521 | 1240 | 1102 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | cross-on | cross-on | on | on | on | on | cross-on |
High Tide | 5:44AM0.52m | 4:04PM0.47m | 7:03AM0.52m | 3:54PM0.43m | 9:02AM0.54m | 10:54AM0.59m | 11:56AM0.64m | 12:39PM0.68m | 11:21PM0.29m | ||||||||||
Low Tide | 10:46PM0.03m | 11:06AM0.27m | 11:19PM0.02m | 12:22PM0.33m | 00:03AM0.02m | 1:10AM0.03m | 2:48AM0.04m | 4:19AM0.02m | 8:00PM0.22m | ||||||||||
 |  | |  |  | |  | | | | | | | | | | | | | |
 | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — |
 | 6:47 | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — |
mm | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — |
Temp °C | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 23 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 21 | 21 | 22 | 22 | 21 | 24 | 24 | 26 | 26 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 19 | SSW 18 | SSW 18 | S 17 | S 16 | S 16 | E 13 | E 13 | E 12 | SSE 12 | E 13 | E 14 | E 13 | S 11 | S 11 | SSW 11 | SSW 11 | SW 12 | ENE 12 |
| kJ | 74 | 107 | 107 | 93 | 130 | 79 | 123 | 119 | 107 | 152 | 285 | 357 | 413 | 116 | 94 | 47 | 74 | 68 | 1102 |
Swell 2 Height (m) Direction Period (s) | S 10 | S 9 | S 12 | S 10 | E 14 | E 14 | S 15 | S 14 | SSE 12 | E 14 | S 11 | S 11 | S 11 | NNE 10 | NNE 10 | NNE 8 | SSE 10 | SSW 19 | SSW 18 |
| kJ | 18 | 7 | 11 | 8 | 33 | 66 | 69 | 65 | 82 | 175 | 121 | 86 | 123 | 20 | 18 | 14 | 10 | 35 | 108 |
Swell 3 Height (m) Direction Period (s) | SW 14 | SW 14 | E 15 | E 14 | S 10 | S 12 | S 11 | SE 13 | S 14 | N 9 | N 9 | S 13 | NNE 11 | SSW 18 | SSW 18 | SSW 16 | NNE 10 | NNE 10 | SW 11 |
| kJ | 7 | 8 | 4 | 14 | 8 | 24 | 9 | 44 | 36 | 2 | 2 | 32 | 12 | 30 | 30 | 25 | 11 | 10 | 31 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 13 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | — |
| kJ | 439 | 441 | 483 | 527 | 525 | 536 | 574 | 478 | 595 | 671 | 500 | 426 | 336 | 1336 | 1445 | 1616 | 1521 | 1240 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 44 | 44 | 116 | 44 | 50 | 55 | 116 | 55 | 116 | 50 | 117 | 57 | 58 | 44 | 45 | 15 | 15 | 15 | 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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