Surf Forecasts:
Waimanalo surf forecast from 11 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 2PM (local time) - 7ft (2.1m), 8s period, ENE swell with 563 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.1m 8s and forecast to arrive on Thursday (Sep 17) 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 0.4m 18s period and expected on Wednesday (Sep 16) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Thu 17th Sep) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's cookin' for Waimanalo.
Well, I gotta be straight with you – this 16-day window is a tough one. We're looking at a pretty blank run to start. The first real shot of any decent surf energy isn't showing up until Thursday the 17th of September, so that leaves us with a gap of nearly a week with nothing worth paddling out for. The wind is the problem, plain and simple. For Waimanalo, which needs a clean offshore from the SW, we're getting hammered by a relentless cross-onshore and onshore flow from the ENE and NE for the entire forecast. That's gonna chop everything up into a messy, lumpy burger.
The water temp is sitting at a normal 80°, so nothing weird there.
Even when the swell starts showing up on the 17th, it's a strong easterly swell with a combined energy of (607) on the Thursday morning, building to (636) by the afternoon. That's a lot of juice, but with those winds it's going to be a washing machine. This is a classic case of "looks better for kite surfing than paddle surfing" – the conditions are just too blown out.
The pick of a very ugly bunch comes later on, around Tuesday the 22nd and Wednesday the 23rd of September. The winds ease up a little, and we get an easterly swell hanging around 6ft with a moderate period of 10 seconds. The combined energy is still chunky at (705) on Tuesday morning and (663) in the afternoon, but the wind goes to a moderate cross-onshore and choppy state. It's not glassy, but it's the cleanest it will get. The swell direction from the ENE is completely wrong for Waimanalo's optimum SW direction, so you're fighting the wind and the swell angle. It's not a standout for quality, it's a standout for being the only thing that's surfable without needing a death wish.
So, to sum it up: The first week is a write-off. The second week has energy, but the conditions will be rough. If you're desperate and you can handle a battle, the 22nd and 23rd of September are your only real window. Otherwise, wait for the trade winds to back off.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu afternoon, min 24°C on Fri night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 24°C on Sun night). Mainly fresh winds. | |||||||||||||||||||
Thu 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 | E 7 | ENE 11 | E 10 | ENE 10 | NE 9 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | ENE 7 | NE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 247 | 181 | 113 | 350 | 216 | 160 | 125 | 135 | 138 | 155 | 145 | 156 | 149 | 149 | 108 | 75 | 128 | 336 | 340 | 469 |
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 | on | on | on | on | on | on | on | on | on |
High Tide | 2:33PM0.65m | 2:42AM0.50m | 2:52PM0.60m | 3:26AM0.53m | 3:07PM0.55m | 4:11AM0.55m | 3:19PM0.50m | 4:57AM0.55m | 3:24PM0.45m | 5:47AM0.53m | 3:20PM0.41m | 6:53AM0.51m | 2:37PM0.40m | |||||||
Low Tide | 8:43PM0.10m | 8:28AM0.08m | 9:04PM0.07m | 9:09AM0.14m | 9:26PM0.05m | 9:50AM0.20m | 9:48PM0.03m | 10:35AM0.25m | 10:11PM0.03m | 11:26AM0.30m | 10:35PM0.05m | 12:57PM0.34m | 11:02PM0.07m | |||||||
 |  |  | |  | | | | | | | | | | | | | | | | |
 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 |
Feels °C | 25 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 25 | 25 | 25 | 27 | 26 | 26 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | E 12 | E 11 | NNE 8 | NNE 8 | NE 8 | NNE 9 | NE 9 | NNE 9 | NNE 9 | NE 9 | NE 9 | ESE 8 | NE 8 | NE 8 | NE 8 | NNE 8 | E 8 | SW 18 | SW 18 | SW 17 |
| kJ | 72 | 94 | 58 | 51 | 57 | 94 | 115 | 135 | 138 | 155 | 145 | 6 | 149 | 149 | 108 | 33 | 29 | 80 | 79 | 76 |
Swell 2 Height (m) Direction Period (s) | NW 9 | SSW 12 | E 11 | SSW 15 | SSW 15 | SSW 16 | SW 16 | ENE 9 | SSW 15 | SW 15 | SSW 14 | SW 14 | SSW 22 | E 13 | E 12 | E 12 | E 11 | S 6 | SW 11 | SE 11 |
| kJ | 13 | 14 | 89 | 22 | 22 | 24 | 10 | 46 | 21 | 8 | 20 | 8 | 45 | 14 | 26 | 43 | 37 | 1 | 5 | 5 |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSW 16 | SSW 16 | NW 8 | SSW 12 | NW 8 | SW 13 | SSW 13 | SW 12 | NW 13 | E 8 | SE 8 | E 7 | SW 21 | SW 20 | ESE 8 | SW 19 | SW 12 | NW 9 | S 11 |
| kJ | 32 | 26 | 26 | 3 | 13 | 3 | 7 | 17 | 6 | 7 | 1 | 2 | 4 | 18 | 60 | 13 | 95 | 5 | 3 | 2 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | E 7 | ENE 11 | E 10 | ENE 10 | ENE 10 | E 4 | E 9 | ENE 9 | E 5 | NE 8 | — | — | — | ENE 7 | NE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 247 | 181 | 113 | 350 | 216 | 160 | 125 | 17 | 78 | 79 | 16 | 156 | — | — | — | 75 | 128 | 336 | 340 | 469 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 45 | 17 | 44 | 15 | 15 | 44 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 44 | 44 | 44 | 50 | 50 | 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.
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