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, this is Rusty. Let’s talk about what’s on offer for Waimanalo over the next couple of weeks.
Honestly, looking at the whole run, it’s a tough stretch. The winds are a real problem. For nearly the entire 16-day window, we’ve got onshore wind from the ENE, and for most of it, it’s a fresh breeze, blowing at 19 mph or more. That’s going to mess up the surface something fierce. It will be bumpy, choppy, and just plain messy.
There’s a gap of about two weeks where there’s nothing worth paddling out for. The first hint of anything less than awful doesn’t show up until Thursday the 24th of September, and even then it’s only a marginal call. The water temp is sitting at about 80°F, which is pretty much normal for this time of year.
So, what’s the best of a bad lot? If you’re desperate, keep an eye on Thursday morning the 24th. The swell is from the E at around 5 ft, with a period of 11 seconds. It’s a bit of a groundswell, which could mean better shape for a reef or point, but it’s a beach break setup here. The wave energy is moderate, checking in at 577. The real kicker here is the wind: a light breeze from the E, just 6 mph, and it’s cross-on. It’s still onshore, but at that strength it’s the closest we get to glassy all period. It’ll be ridable, but don’t expect perfection.
There’s also a late mention on Friday the 25th, but it’s just as marginal.
With so much fresh onshore wind and the swell being short-period for most of it, conditions are just ugly. Honestly, with those winds and the consistent onshore fetch, this setup looks more interesting for kite surfing than paddle surfing for a good chunk of the time.
Stay patient.
- 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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