Surf Forecasts:
Waimanalo surf forecast from 18 Aug 2026:
- Most powerful swell: Monday 24 Aug, 8PM (local time) - 7.5ft (2.3m), 7s period, ENE swell with 557 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.3m 7s and forecast to arrive on Monday (Aug 24) 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 0.4m 14s period and expected on Monday (Aug 17) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Mon 24th Aug) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s cut through it. We’re looking at Waimanalo for the next 16 days, and I’ll be straight with you – it’s a pretty bleak stretch for surfing. The whole run is basically a write-off for proper waves.
There is no surf worth paddling out for in this entire forecast window. The first record tells us everything: Monday afternoon, 17th August, kicks things off with a 5ft swell from the ENE but a solid 16 mph onshore wind blowing straight into it. The water’s sitting at a warm 80°F, which is normal for this time of year, but that’s about the only good news. The combined wave energy is weak, sitting at just 262, and the period is short at 7 seconds – just wind-chop with no shape.
From Tuesday 18th right through to the end of the month, it’s the same story. Swell heights bob between 3ft and 8ft, but every single day has onshore or cross-onshore winds. The periods stay short, between 6 and 10 seconds, so it’s all disorganised, lumpy, messy stuff. Even when the swell pushes to 7ft or more, it’s blown out. The combined energy climbs up to over 1000 towards the end of the month, but without clean winds, that energy is just raw, choppy power – more for kites than paddles.
For the first week, the wind is relentless – moderate to fresh breezes from the ENE, never letting up. By around Saturday 29th August, you’ve got 10ft swell, but it’s still cross-onshore and choppy. On Sunday 30th August, the period stretches to 10 seconds, which is better, but that cross-on wind turns it into a lumpy mess. Then it drops off into September with tiny 3ft swell and howling 28 mph winds on Tuesday 1st September.
Honestly, there’s not a single standout session in here. If you’re desperate, maybe sneak a look on Friday 21st August morning when the wind drops to a light 6 mph breeze, but it’s only 2ft from the east with a period of 7 seconds – tiny and weak. Not worth the drive.
For an area that’s exposed to the ENE, we’re getting plenty of swell direction, but the wind never plays ball. The crowd profile says Waimanalo is “sometimes” busy, but with conditions this poor, you won’t have to worry about that. The break is fairly consistent, but when the quality is this bad, consistency means nothing.
So, to sum it up: no surf on offer for the full 16 days. It’s a blank run. The only positive? Forecasts can change, and this kind of extended poor run is not abnormal for the area when the trade winds lock in. Keep an eye on it, but don’t hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Thu night). Winds increasing (light winds from the NE on Thu night, fresh winds from the ENE by Sat night). | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 7 | ENE 7 | ENE 7 | ENE 6 | ENE 5 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 7 |
Wave Graph | ||||||||||||||||||||
261 | 173 | 139 | 119 | 102 | 113 | 84 | 82 | 74 | 70 | 68 | 48 | 113 | 102 | 115 | 150 | 330 | 257 | 164 | 317 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | cross-on | on | on | on | on | on | on | cross-on | cross-on | cross-on | on | on | cross-on | on | on | on |
High Tide | 4:40PM0.47m | 8:02AM0.45m | 4:17PM0.43m | 10:23AM0.47m | 11:48AM0.51m | 12:32PM0.55m | 1:04PM0.58m | 10:27PM0.27m | 1:31PM0.61m | 11:46PM0.30m | ||||||||||
Low Tide | 11:52PM0.07m | 12:27PM0.33m | 00:26AM0.08m | 1:15AM0.09m | 2:41AM0.09m | 4:16AM0.08m | 9:18PM0.23m | 5:19AM0.05m | 8:24PM0.22m | |||||||||||
— | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 25 | 26 | 26 | 25 | 25 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 25 | 24 | 24 | 23 | 24 | 24 | 26 | 26 | 28 | 27 | 27 | 27 | 28 | 28 | 27 | 25 | 24 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | S 14 | S 13 | S 13 | S 13 | S 13 | NE 6 | E 8 | E 8 | E 8 | E 7 | E 7 | E 7 | E 8 | E 8 | ESE 8 | SSW 16 | NW 13 | NW 12 | ESE 9 | NW 11 |
65 | 55 | 54 | 30 | 29 | 51 | 84 | 82 | 74 | 70 | 68 | 48 | 12 | 12 | 23 | 25 | 41 | 35 | 113 | 30 | |
Swell 2 Height (m) Direction Period (s) | S 6 | E 9 | SW 17 | NE 8 | NNE 7 | S 12 | NE 6 | NE 6 | NE 6 | NNE 7 | NNE 7 | NNE 6 | SSW 16 | SSW 16 | SSE 15 | S 12 | SSE 14 | SSE 13 | NW 11 | SSE 13 |
5 | 7 | 11 | 10 | 5 | 11 | 40 | 40 | 39 | 38 | 40 | 36 | 27 | 50 | 42 | 12 | 41 | 35 | 31 | 34 | |
Swell 3 Height (m) Direction Period (s) | N 7 | N 7 | N 7 | SW 18 | S 6 | SSE 9 | S 12 | S 12 | SSW 18 | SSW 18 | SSW 17 | SSW 17 | SSE 8 | S 13 | SSW 16 | SSE 15 | SSW 16 | ESE 11 | SSW 15 | SSW 14 |
1 | 1 | 1 | 12 | 1 | 8 | 11 | 11 | 31 | 30 | 27 | 29 | 7 | 14 | 26 | 21 | 24 | 23 | 22 | 21 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 5 | E 8 | — | — | — | — | — | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | ENE 7 |
261 | 173 | 139 | 119 | 102 | 113 | — | — | — | — | — | 36 | 113 | 102 | 115 | 150 | 330 | 257 | 164 | 317 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 17 | 17 | 44 | 44 | 15 | 15 | 15 | 15 | 9 | 14 | 5 | 9 | 14 | 15 | 15 | 44 | 44 | 44 | 116 | 44 |
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.











