
Surf Forecasts:
Waimanalo surf forecast from 15 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 8PM (local time) - 7ft (2.2m), 9s period, ENE swell with 705 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 9s and forecast to arrive on Thursday (Sep 17) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 15s period and expected on Sunday (Sep 20) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 17th Sep) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s talk about what we’ve got at Waimanalo. I gotta be straight with you – this outlook is a tough one. For the next two weeks, the wind is mostly howling onshore or cross-onshore from the ENE, and the wave quality just isn't there. There’s a long stretch with nothing rideable, so don't bother getting your hopes up until the very end of the run.
Right now, through September 14th right into the first week, the swell shows up but it’s messy. The wind is blowing hard from the NE and ENE at 12 to 25 mph, and the wave comment consistently says "poor surf conditions." Swell heights bounce around from a tiny 2 ft to a solid 8 ft, but the wind is trashing it. The combined energy is moderate to strong (values between 94 and 781), but it doesn’t matter when the sea is a lumpy, cross-onshore mess. You’re looking at a solid two weeks of this junk.
Then we hit September 28th. Monday morning still has that onshore breeze and the energy is still moderate (556), but by Monday afternoon the wind drops to a light breeze at 6 mph, and the swell is 7 ft from the ENE. It’s still listed as "marginal," but that’s the first sign of hope.
Now, here’s the standout. You want to circle Tuesday, September 29th. Early morning at Waimanalo, the wind switches to a light 6 mph from the SE – that’s cross-offshore, which cleans things right up. The swell is 7 ft from the NE with a period of 8 seconds. The combined energy is strong at 694. The wave comment says "expect very good surf conditions." That’s our window. A 7 ft NE swell with light offshore wind? That’s the best we’ve seen in this whole forecast. It’s going to be clean and have some push. Just be aware this spot is exposed to the swell, and crowds are possible here sometimes. The water temp is about 81°F, which is perfectly normal for the time of year, so no wetsuit needed.
That Tuesday afternoon the wind goes cross-on again, so the morning session is the target. After that, it’s back to mostly poor conditions for the rest of the outlook.
So, to sum it up: save your energy for the morning of September 29th. Everything else is a write-off.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Warm (max 26°C on Mon afternoon, min 25°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Warm (max 27°C on Fri morning, min 25°C on Thu night). Mainly fresh winds. | |||||||||||||||||||
Mon 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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) | NE 8 | NE 8 | NNE 8 | NE 8 | ENE 5 | E 10 | ENE 5 | NE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 7 | E 8 | ENE 8 | E 8 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | ||||||||||||||||||||
80 | 51 | 39 | 128 | 58 | 51 | 94 | 188 | 494 | 642 | 614 | 427 | 461 | 404 | 428 | 437 | 464 | 355 | 327 | 355 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | on | on | on | on | cross-on | on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on |
High Tide | 3:24PM0.45m | 5:47AM0.53m | 3:20PM0.41m | 6:53AM0.51m | 2:37PM0.40m | 8:54AM0.49m | 10:52AM0.51m | 11:47AM0.54m | 12:22PM0.57m | 11:21PM0.27m | ||||||||||
Low Tide | 10:11PM0.03m | 11:26AM0.30m | 10:35PM0.05m | 12:57PM0.34m | 11:02PM0.07m | 11:41PM0.10m | 1:18AM0.13m | 3:40AM0.12m | 7:51PM0.20m | 4:53AM0.10m | ||||||||||
— | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | |
mm | — | — | — | — | — | — | — | 2 | — | 2 | 6 | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 25 |
Feels °C | 26 | 26 | 27 | 27 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | NE 8 | NE 8 | NNE 8 | E 12 | NNE 8 | NNE 7 | E 10 | E 10 | SSW 16 | SSW 16 | SSW 18 | SSW 17 | SW 17 | SSW 15 | SSW 16 | SW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 |
80 | 51 | 39 | 44 | 37 | 37 | 73 | 96 | 25 | 25 | 124 | 116 | 71 | 44 | 47 | 62 | 86 | 79 | 74 | 71 | |
Swell 2 Height (m) Direction Period (s) | SSW 22 | NNE 10 | E 12 | SSW 20 | E 11 | E 10 | SW 18 | SW 17 | SSW 19 | SSW 19 | S 10 | S 10 | SSE 9 | SSW 16 | S 18 | S 18 | S 13 | N 11 | N 11 | N 11 |
45 | 9 | 26 | 37 | 37 | 51 | 79 | 76 | 37 | 36 | 2 | 2 | 7 | 26 | 25 | 25 | 3 | 2 | 2 | 9 | |
Swell 3 Height (m) Direction Period (s) | SW 14 | E 13 | SW 20 | SW 12 | SW 19 | SW 18 | N 9 | S 11 | SE 11 | S 10 | NW 12 | NW 10 | S 21 | S 19 | S 9 | SSE 7 | SW 15 | S 8 | NW 9 | NW 8 |
8 | 14 | 60 | 6 | 95 | 80 | 7 | 2 | 4 | 2 | 6 | 4 | 9 | 29 | 2 | 5 | 8 | 1 | 3 | 3 | |
Wind waves Height (m) Direction Period (s) | ENE 4 | ENE 4 | ENE 5 | NE 8 | ENE 5 | ENE 5 | ENE 5 | NE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 7 | E 8 | ENE 8 | E 8 | ENE 7 | ENE 7 | ENE 7 |
14 | 18 | 24 | 128 | 58 | 51 | 94 | 188 | 494 | 642 | 614 | 427 | 461 | 404 | 428 | 437 | 464 | 355 | 327 | 355 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 15 | 15 | 15 | 15 | 17 | 44 | 116 | 17 | 44 | 45 | 44 | 45 | 50 | 44 | 44 | 44 | 44 | 44 | 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.










