Surf Forecasts:
Waimanalo surf forecast from 16 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 2AM (local time) - 15ft (4.5m), 10s period, E swell with 3,370 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 4.5m 10s and forecast to arrive on Sunday (Aug 16) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 10s period and expected on Sunday (Aug 16) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Sun 16th Aug) | 15ft (4.5m) 10s |
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 cards.
Honestly, for the next couple of weeks, the outlook for this area is a real tough one. The trade winds are going to be howling straight down the barrel most days, kicking up a messy, lumpy ocean. I'm not seeing anything worth paddling out for until right at the tail end of the window. We're looking at a pretty big gap of poor conditions from now until the end of August.
The first real glimmer of hope, and it's a long-range whisper at this stage, is around the morning of Sunday the 30th of August. For Waimanalo, we’ve got some serious energy showing up from that deep, long-period groundswell. The combined wave energy is ramping right up (1537) and it's coming from the east with a period around 15 seconds – that's proper long-period groundswell. You're looking at waves around 6 ft. Now, the catch here is that the wind will still be a gentle cross-onshore, which will keep it a bit choppy, but it's a massive step up from the weeks prior. Because the swell period is so long, it could unload a bit too straight along this beach, so it won't be perfect, but for the size and the energy, this is the standout window. The water temp is around 81°, which is bang on average for this time of year.
Before that, on the Saturday the 29th, the wave energy is building, with that same long-period swell starting to fill in (483 on the morning, 572 on the afternoon). The morning will be a bit cross-onshore and choppy with smallish 3 ft surf, and the afternoon sees it cleaning up slightly but still onshore. It's a sign of things to come, but Sunday morning is the better bet.
Given the relentless onshore winds and lumpy conditions for most of the period, this isn't a stretch for standard surfing. With those strong onshore blows and the beach setup, this coastline is going to be far more interesting for the kite surfers than for us paddle surfers for the bulk of the forecast.
Keep your eyes on that Sunday the 30th. It's a ways off, so the forecast could shuffle, but that's where the potential is. The rest of the time, it's a write-off.
Rusty.
Short Range ForecastHeavy rain (total 55mm), heaviest during Sun morning. Warm (max 26°C on Sat afternoon, min 24°C on Sat night). Winds decreasing (near gales from the ENE on Sat afternoon, moderate winds from the E by Sun night). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Thu morning, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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 9 | E 10 | E 9 | E 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 5 | E 8 | ENE 8 | ENE 8 | E 8 | ENE 7 | E 7 | E 8 | NNE 6 | NE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2746 | 3370 | 1417 | 887 | 438 | 292 | 245 | 168 | 178 | 112 | 102 | 140 | 183 | 155 | 72 | 118 | 53 | 33 | 26 | 59 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | on | cross-on | cross-on | on | on | on | on | on | on | on | on |
High Tide | 4:30PM0.58m | 5:20AM0.44m | 4:40PM0.52m | 6:27AM0.44m | 4:40PM0.47m | 8:02AM0.45m | 4:17PM0.43m | 10:23AM0.47m | 11:48AM0.51m | 12:32PM0.55m | ||||||||||
Low Tide | 10:59PM0.09m | 10:41AM0.19m | 11:25PM0.08m | 11:25AM0.27m | 11:52PM0.07m | 12:27PM0.33m | 00:26AM0.08m | 1:15AM0.09m | 2:41AM0.09m | 4:16AM0.08m | ||||||||||
 |  | | | |  | |  | | | | | |  |  | |  | | | | |
 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — |
 | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — |
mm | 2 | 11 | 32 | 7 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 24 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 25 | 26 | 26 |
Feels °C | 21 | 20 | 21 | 26 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 26 | 27 | 27 | 26 | 27 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 14 | SSE 10 | SSE 8 | ENE 8 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | NE 7 | S 12 | E 8 | NE 6 | E 7 | E 7 | NNE 6 | NNE 6 | NE 7 |
| kJ | 31 | 63 | 209 | 112 | 438 | 103 | 65 | 55 | 54 | 30 | 29 | 17 | 11 | 80 | 40 | 67 | 53 | 21 | 26 | 59 |
Swell 2 Height (m) Direction Period (s) | NNW 9 | NNW 9 | S 16 | S 16 | S 7 | SSE 6 | S 6 | E 9 | SW 17 | NE 8 | N 8 | NNE 6 | SSE 9 | NE 6 | SSW 18 | NNE 6 | NNE 6 | ENE 7 | E 7 | ESE 8 |
| kJ | 7 | 8 | 83 | 46 | 25 | 7 | 6 | 15 | 11 | 9 | 1 | 8 | 8 | 40 | 31 | 35 | 34 | 26 | 24 | 24 |
Swell 3 Height (m) Direction Period (s) | S 16 | S 18 | NNW 8 | S 13 | S 13 | N 8 | N 7 | S 5 | N 7 | SE 6 | SW 18 | S 12 | SW 16 | S 12 | S 11 | SSW 18 | SSW 17 | E 8 | E 8 | SSW 16 |
| kJ | 5 | 25 | 7 | 30 | 56 | 1 | 1 | 1 | 1 | 1 | 12 | 11 | 11 | 11 | 10 | 30 | 27 | 33 | 12 | 50 |
Wind waves Height (m) Direction Period (s) | ENE 9 | E 10 | E 9 | E 8 | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 5 | E 8 | ENE 8 | ENE 8 | E 8 | ENE 7 | — | — | — | — |
| kJ | 2746 | 3370 | 1417 | 887 | — | 292 | 245 | 168 | 178 | 112 | 102 | 140 | 183 | 155 | 72 | 118 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 212 | 147 | 48 | 9 | 15 | 44 | 44 | 15 | 44 | 15 | 15 | 44 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 |
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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