
Surf Forecasts:
Waimanalo surf forecast from 10 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 8AM (local time) - 6ft (1.9m), 8s period, ENE swell with 498 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 1.9m 8s and forecast to arrive on Thursday (Sep 17) at 8AM. 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 19s period and expected on Wednesday (Sep 16) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Thu 17th Sep) | 6ft (1.9m) 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 on the table for the Waimanalo stretch. I gotta be straight with you – this one’s a tough read. The whole 16-day window is looking like a write-off for a proper paddle session. We’re starting with the first possible surf on Thursday, September 10th, and it’s a grim picture from the get-go.
The wind is a constant problem. It’s almost always onshore or cross-onshore, with moderate to fresh breezes that are going to leave the surface choppy and lumpy. We’re looking at a persistent ENE flow that just won’t quit. The swell is mostly small, hanging around the 3 ft to 6 ft mark, but it’s wrapped in a short, weak period of 7 to 11 seconds. The combined swell energy is moderate at best, hitting a peak of 508 on Friday the 11th, but that’s still paired with poor conditions. The water temp is about average for this time of year, so nothing unusual there.
Honestly, there isn’t a single standout day. The whole period is flagged as “poor surf conditions” with a score of zero. The wind is just too strong and from the wrong direction for Waimanalo. With the ENE wind blowing straight on, it’s going to be a mess. The swell direction is mostly E to ENE, which is not the optimum NE direction for this spot, so the waves won’t be wrapping in cleanly.
The closest thing to a pulse happens around Friday, September 18th and Saturday, September 19th, where the swell bumps up to 6 ft. But with a period of 7-8 seconds and a strong breeze, that’s just a recipe for short, choppy, blown-out lines. The combined energy is moderate (443 on the 18th), but with the wind, it’s not going to be surfable. This setup looks far more interesting for kite surfing than paddle surfing, to be honest.
You’re looking at a blank run for the entire 16 days. There’s no relief in sight. The forecast is consistent, but consistently bad. It’s one of those stretches where you’d be better off finding another hobby for a couple of weeks.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 24°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Mon afternoon, min 25°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 11 | E 10 | ENE 10 | NE 9 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 7 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph | |||||||||||||||||||||
261 | 225 | 181 | 128 | 238 | 216 | 128 | 125 | 135 | 135 | 115 | 123 | 118 | 95 | 131 | 96 | 111 | 121 | 306 | 356 | 414 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | on | on | on | on | cross-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 | — | — | 6:16 | — | — | |
— | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 27 | 26 | 24 | 24 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | E 12 | E 12 | E 11 | E 11 | E 11 | NE 8 | NNE 9 | NE 9 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NE 6 | NE 8 | ESE 7 | E 11 | SW 18 | SW 18 | E 10 |
104 | 72 | 94 | 89 | 238 | 57 | 96 | 115 | 135 | 135 | 115 | 123 | 118 | 95 | 46 | 96 | 18 | 58 | 80 | 79 | 65 | |
Swell 2 Height (m) Direction Period (s) | NW 8 | NW 9 | SSW 12 | NNE 8 | NNE 8 | SSW 15 | SSW 16 | SW 16 | SSW 13 | ENE 9 | ENE 9 | SSW 14 | ESE 8 | ESE 8 | NE 8 | ESE 8 | E 12 | E 7 | NW 9 | S 12 | SW 17 |
20 | 13 | 14 | 44 | 74 | 22 | 24 | 10 | 17 | 26 | 25 | 20 | 6 | 6 | 58 | 22 | 44 | 25 | 3 | 3 | 76 | |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 16 | SSW 16 | SSW 15 | SSE 8 | SSE 8 | SW 13 | NW 15 | SSW 15 | SW 15 | ESE 8 | SW 14 | SSW 22 | ESE 7 | E 12 | SSW 20 | SW 19 | SW 12 | NW 9 | SE 11 |
33 | 32 | 26 | 26 | 22 | 7 | 6 | 7 | 8 | 21 | 8 | 7 | 8 | 45 | 5 | 26 | 37 | 95 | 5 | 3 | 5 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | — | E 10 | ENE 10 | ENE 10 | ENE 9 | E 4 | E 4 | ENE 4 | E 8 | — | NE 8 | — | NE 8 | NE 7 | ENE 8 | ENE 8 | ENE 8 |
261 | 225 | 181 | 128 | — | 216 | 128 | 125 | 84 | 9 | 13 | 14 | 21 | — | 131 | — | 111 | 121 | 306 | 356 | 414 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 15 | 44 | 44 | 15 | 17 | 15 | 15 | 15 | 15 | 15 | 15 | 17 | 26 | 15 | 9 | 14 | 14 | 14 | 15 | 44 | 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.










