Surf Forecasts:
Waimanalo surf forecast from 19 Aug 2026:
- Most powerful swell: Monday 24 Aug, 11PM (local time) - 8ft (2.4m), 8s period, ENE swell with 627 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.4m 8s and forecast to arrive on Monday (Aug 24) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 12s period and expected on Sunday (Aug 23) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Mon 24th Aug) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, let me break it down for you the old-fashioned way. We're staring down a 16-day stretch that's gonna test your patience. The first week and a half is mostly dead air for anything decent. The first real sign of life doesn't show up until Wednesday, September 2nd.
For the first two weeks, starting Tuesday, August 18th, it's a no-go. The wind is howling out of the ENE, straight onshore, and it's not letting up. We're talking 20-25 mph winds, sometimes stronger, just bulldozing the surface. The swell builds up, sure, going from a weak 3-4 ft to a solid 8 ft, but with that wind, it's just a blown-out mess. The wave energy cranks up from moderate to a massive 1134, but it's all short-period junk at 6-8 seconds – wind chop, not groundswell. This whole period looks way better for a kite than a surfboard. Water temps are around 81°F, which is about normal for this time of year.
Now, here's the tiny ray of hope. On Wednesday, September 2nd, the wind finally backs off to a light 10 mph from the NE, going offshore for Waimanalo. The swell will be around 5-6 ft from the E, with a longer 10-second period. That's the kind of period that gives the waves some backbone. The wave energy is moderate, but it'll be way more organized than anything else we've seen. It's still only a "marginal" call, but it's the only window in the whole 16 days where you might find a clean-ish wave. Mark it down, but don't get your hopes too high.
Otherwise, it's a long stretch of nothing. Keep the board in the car just in case the forecast flips, but don't hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu night, min 24°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 25°C on Sat night). Winds increasing (light winds from the E on Fri afternoon, strong winds from the ENE by Sun morning). | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 | E 8 | E 8 | E 8 | E 8 | ENE 7 | NE 7 | NE 7 | ENE 7 | ENE 6 | ENE 6 | E 7 | E 7 | ENE 6 | ENE 6 | E 6 | ENE 7 | ENE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 160 | 172 | 121 | 84 | 82 | 57 | 54 | 69 | 93 | 106 | 149 | 176 | 245 | 293 | 293 | 253 | 235 | 345 | 448 | 592 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | cross-on |
High Tide | 4:17PM0.43m | 10:23AM0.47m | 11:48AM0.51m | 12:32PM0.55m | 1:04PM0.58m | 10:27PM0.27m | 1:31PM0.61m | 11:46PM0.30m | 1:55PM0.63m | 00:27AM0.33m | ||||||||||
Low Tide | 00:26AM0.08m | 1:15AM0.09m | 2:41AM0.09m | 4:16AM0.08m | 9:18PM0.23m | 5:19AM0.05m | 8:24PM0.22m | 6:03AM0.02m | 8:21PM0.21m | |||||||||||
 |  |  | | | | |  | | | | | | | | | | | | | |
 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 22 | 24 | 26 | 25 | 26 | 26 | 28 | 30 | 29 | 29 | 28 | 26 | 24 | 23 | 23 | 22 | 23 | 23 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | S 12 | NE 6 | E 8 | NE 6 | NE 7 | ENE 7 | NE 7 | E 8 | SSW 16 | SSE 15 | SSW 16 | WNW 12 | SSE 13 | NW 11 | ESE 9 | NW 12 | NW 12 | NW 11 |
| kJ | 30 | 29 | 11 | 39 | 82 | 40 | 46 | 69 | 93 | 6 | 50 | 42 | 25 | 29 | 35 | 19 | 68 | 35 | 34 | 19 |
Swell 2 Height (m) Direction Period (s) | SW 18 | NNE 7 | SSE 9 | S 12 | NE 6 | E 8 | E 8 | NNE 7 | SSW 17 | SSW 16 | ESE 8 | SSW 16 | S 12 | SSE 14 | NW 11 | SSE 13 | NW 11 | SSE 13 | SSW 13 | SSW 13 |
| kJ | 12 | 5 | 8 | 11 | 46 | 57 | 54 | 46 | 29 | 25 | 14 | 26 | 12 | 41 | 33 | 18 | 31 | 33 | 18 | 16 |
Swell 3 Height (m) Direction Period (s) | W 13 | SW 18 | SW 16 | SW 16 | S 12 | SSW 18 | SSW 18 | SSW 17 | S 15 | SSE 9 | S 13 | NW 16 | WNW 14 | SSW 16 | SSW 16 | SSW 15 | SSE 13 | SSW 14 | SSE 12 | SSE 12 |
| kJ | 3 | 12 | 10 | 11 | 11 | 31 | 30 | 27 | 17 | 7 | 14 | 9 | 18 | 24 | 24 | 22 | 34 | 19 | 15 | 14 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | E 8 | — | — | — | — | — | NE 7 | ENE 7 | ENE 6 | ENE 6 | E 7 | E 7 | ENE 6 | ENE 6 | E 6 | ENE 7 | ENE 8 |
| kJ | 160 | 172 | 121 | 84 | — | — | — | — | — | 106 | 149 | 176 | 245 | 293 | 293 | 253 | 235 | 345 | 448 | 592 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 15 | 15 | 15 | 15 | 15 | 15 | 9 | 9 | 9 | 15 | 9 | 44 | 50 | 50 | 55 | 55 | 44 | 52 | 50 | 45 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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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