Surf Forecasts:
Waimanalo surf forecast from 24 Aug 2026:
- Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 6.5ft (2.0m), 7s period, E swell with 388 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.0m 7s and forecast to arrive on Tuesday (Aug 25) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 17s period and expected on Thursday (Aug 27) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Tue 25th Aug) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Gotta be straight with you – this outlook for Waimanalo is a tough one. We’re looking at a long, dry spell before anything even remotely worth paddling out for shows up.
Right off the bat, from Monday the 24th of August, it’s a write-off. We’ve got a persistent ENE breeze dumping on us, making everything lumpy and choppy. The swell is a weak, short-period windswell – think 5 to 6 feet but with a period of just 6 to 7 seconds, so no real push or shape. The wave energy is pitiful, mostly in the low hundreds for the first week. The water temperature is sitting at 81° which is about average for this time of year, but trust me, you won’t care about the temp when you’re getting blown off your board.
This messy pattern just grinds on. Monday through Friday is all "poor surf conditions" with onshore winds. The weekend of the 30th-31st isn't any better. We’re looking at a solid 10-11 day gap with zero recommendations. Just a constant stream of fresh onshore wind and weak, bumpy lines. It’s a real bummer.
Now, finally, there’s a little light at the end of the tunnel. We start seeing a change around the 7th of September. Monday the 7th is still marginal, but the wind drops right off to a light breeze. It’s still cross-onshore, but the energy is picking up a bit.
The real standout, and the only one I’d even point you towards, is the morning of Tuesday the 8th of September. We get a light cross-offshore breeze from the SSE, which is a game-changer. The wind state is listed as "clean". The swell is a solid 7 feet from the East with an 8-second period, and the combined energy hits 585 – that’s a moderate, punchy amount of power. It’s a bit of a wait, but that Tuesday morning session is the only time in this whole 16-day window that looks like it might actually deliver some proper, clean waves at Waimanalo. The afternoon on the 8th is still okay with a light cross-on, but the morning is the call. Don't sleep on it. It’s a long way off, but it’s the only hope we’ve got.
This is Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 26°C on Mon morning, min 25°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 25°C on Thu morning). Mainly fresh winds. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
AM | 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) | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | NE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 316 | 266 | 240 | 341 | 311 | 233 | 194 | 153 | 155 | 134 | 113 | 160 | 101 | 172 | 260 | 276 | 326 | 285 | 198 | 97 | 168 |
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 | on | on | cross-on | on | on | cross-on | on | on | cross-on | on | on | cross-on | cross-on | on | on |
High Tide | 1:55PM0.63m | 00:27AM0.33m | 2:17PM0.65m | 1:04AM0.37m | 2:38PM0.65m | 1:42AM0.40m | 2:57PM0.65m | 2:22AM0.43m | 3:14PM0.63m | 3:05AM0.46m | 3:30PM0.60m | 3:52AM0.48m | 3:45PM0.56m | 4:44AM0.51m | |||||||
Low Tide | 8:21PM0.21m | 6:39AM-0.00m | 8:32PM0.20m | 7:12AM-0.01m | 8:49PM0.18m | 7:45AM-0.00m | 9:08PM0.15m | 8:18AM0.02m | 9:29PM0.12m | 8:54AM0.07m | 9:52PM0.09m | 9:33AM0.13m | 10:17PM0.05m | ||||||||
 | |  |  | | | | | | | | | | |  | | | | | |  | |
 | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 26 | 26 |
Feels °C | 25 | 25 | 27 | 23 | 23 | 24 | 22 | 22 | 22 | 23 | 22 | 22 | 22 | 24 | 22 | 21 | 21 | 23 | 22 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SSE 12 | SSE 12 | SSE 7 | SSW 12 | SSW 16 | SSW 14 | SSW 14 | S 18 | S 19 | S 17 | S 17 | S 16 | S 14 | S 14 | E 12 | E 14 | E 13 | E 12 | ENE 12 | NNE 7 | ENE 11 |
| kJ | 30 | 28 | 10 | 15 | 50 | 21 | 41 | 98 | 181 | 214 | 143 | 121 | 103 | 100 | 77 | 142 | 126 | 75 | 46 | 70 | 40 |
Swell 2 Height (m) Direction Period (s) | NW 11 | SSW 13 | SSW 13 | SSE 11 | SSW 12 | S 18 | S 18 | SSW 13 | SSW 13 | SSW 12 | NNE 8 | NNE 7 | NNE 7 | E 14 | S 14 | S 13 | S 13 | S 12 | S 12 | ENE 11 | S 11 |
| kJ | 18 | 35 | 16 | 13 | 14 | 25 | 25 | 17 | 17 | 14 | 13 | 11 | 15 | 61 | 60 | 54 | 54 | 26 | 25 | 41 | 21 |
Swell 3 Height (m) Direction Period (s) | SSW 14 | WNW 10 | SSE 12 | SSW 16 | SSE 12 | SSE 12 | NW 10 | NW 9 | WNW 10 | NNE 8 | SSW 12 | S 11 | E 15 | NW 9 | NW 9 | SW 18 | SW 17 | SSW 17 | SSW 16 | S 12 | SSW 15 |
| kJ | 18 | 10 | 14 | 25 | 13 | 14 | 4 | 3 | 10 | 7 | 14 | 9 | 39 | 3 | 3 | 12 | 12 | 28 | 26 | 25 | 22 |
Wind waves Height (m) Direction Period (s) | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | NE 7 |
| kJ | 316 | 266 | 240 | 341 | 311 | 233 | 194 | 153 | 155 | 134 | 113 | 160 | 101 | 172 | 260 | 276 | 326 | 285 | 198 | 97 | 168 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 50 | 44 | 44 | 50 | 50 | 44 | 50 | 50 | 44 | 44 | 116 | 44 | 44 | 50 | 44 | 50 | 52 | 44 | 44 | 46 | 17 |
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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