Surf Forecasts:
Waimanalo surf forecast from 11 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 8PM (local time) - 8ft (2.4m), 9s period, ENE swell with 958 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 9s and forecast to arrive on Thursday (Sep 17) at 8PM. 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 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 17th Sep) | 8ft (2.4m) 9s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here. Let's chew the fat on what's coming our way.
For the next two weeks, it's looking pretty bleak. The finder's coming up with absolutely nothing for days. We're staring down a long, dry spell from now all the way through the 24th of September. The trade winds are just hammering us from the ENE, onshore nearly every day, and any swell that tries to show up gets chopped to bits. It's a grind.
The first real glimmer of hope doesn't come until Thursday, September 24th. Waimanalo finally gets a pulse of energy. The combined swell energy is pumping hard at 1033, with a clean 6 feet of east swell rolling in at a nice 10-second interval. That's a long-period groundswell, so the waves will have some real shape and grunt to them, best on the points. The big difference here is the wind: light and variable out of the SE, barely 6 mph. For a spot that's been getting clobbered by cross-onshore breeze, this is a huge change. It's going to be glassy, clean, and inviting. Water temp is a comfortable 81°, right on the money for this time of year.
Keep in mind, Waimanalo is "fairly consistent" and "exposed," so it should soak up that energy. But it can get crowded "sometimes," and after this long stretch of junk surf, everyone’s going to be frothing on that Thursday window. Expect a busy lineup.
The swell holds into Friday the 25th with similar size, around 6 feet to 7 feet, but the wind swings back onshore from the ENE, so that Thursday window is your one standout. By Saturday the 26th, the period drops and the chop returns.
These quiet runs don't tend to hang around forever around here. One decent break in the wind is all it takes to turn it around. Keep your board waxed and your eye on the forecast.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Fri morning, min 24°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 25°C on Mon morning). Mainly fresh winds. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 11 | ENE 10 | ENE 10 | NE 9 | NNE 9 | NNE 9 | NNE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NNE 8 | E 12 | ENE 6 | ENE 6 | ENE 6 | ENE 8 | ENE 8 | ENE 10 | ENE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 117 | 238 | 177 | 160 | 125 | 135 | 138 | 138 | 123 | 100 | 69 | 51 | 44 | 44 | 81 | 185 | 289 | 397 | 584 | 940 | 791 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on |
High Tide | 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 | 8:54AM0.49m | |||||||||
Low Tide | 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 | 11:41PM0.10m | ||||||||
 | |  | | | | | | |  | |  | | | | | | | | |  | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 24 | 23 | 24 | 27 | 26 | 25 | 25 | 24 | 25 | 25 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | NNE 8 | NNE 8 | ENE 10 | NNE 9 | NE 9 | NNE 9 | NNE 9 | NNE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NNE 8 | NNE 8 | NNE 8 | SW 18 | SW 18 | E 10 | SSW 16 | SSW 16 | SSW 18 |
| kJ | 58 | 74 | 177 | 94 | 115 | 135 | 138 | 138 | 123 | 100 | 69 | 51 | 39 | 34 | 37 | 80 | 79 | 51 | 25 | 25 | 124 |
Swell 2 Height (m) Direction Period (s) | E 11 | SSW 15 | NE 8 | SSW 16 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | SSW 14 | SW 14 | SSW 22 | E 13 | E 12 | E 12 | E 11 | N 10 | NNE 9 | SW 17 | SSW 19 | SSW 19 | S 10 |
| kJ | 89 | 22 | 57 | 24 | 125 | 46 | 26 | 25 | 20 | 8 | 45 | 14 | 26 | 44 | 58 | 7 | 7 | 76 | 37 | 36 | 2 |
Swell 3 Height (m) Direction Period (s) | SSW 16 | NW 8 | SSW 15 | S 5 | SW 16 | SSW 13 | SSW 15 | SW 15 | NW 12 | SE 8 | SW 14 | NNE 10 | SW 20 | SSW 20 | SW 19 | NW 9 | NW 9 | S 11 | S 11 | S 10 | — |
| kJ | 26 | 3 | 22 | 1 | 10 | 17 | 21 | 8 | 6 | 2 | 8 | 10 | 60 | 37 | 95 | 3 | 3 | 2 | 2 | 2 | — |
Wind waves Height (m) Direction Period (s) | E 7 | E 11 | — | ENE 10 | — | E 4 | E 5 | E 5 | ENE 4 | ENE 5 | ENE 5 | ENE 5 | ENE 5 | NE 5 | ENE 6 | ENE 6 | ENE 6 | ENE 8 | ENE 8 | ENE 10 | ENE 9 |
| kJ | 117 | 238 | — | 160 | — | 8 | 27 | 11 | 13 | 39 | 22 | 31 | 44 | 42 | 81 | 185 | 289 | 397 | 584 | 940 | 791 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 15 | 15 | 44 | 15 | 15 | 44 | 15 | 26 | 15 | 44 | 15 | 15 | 44 | 44 | 50 | 116 | 44 | 50 | 55 | 44 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Waimanalo surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest