Surf Forecasts:
Waimanalo surf forecast from 31 Aug 2026:
- Most powerful swell: Sunday 6 Sep, 8AM (local time) - 7.5ft (2.3m), 12s period, ENE swell with 1,518 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.3m 12s and forecast to arrive on Sunday (Sep 06) 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 0.8m 10s period and expected on Saturday (Sep 05) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 6th Sep) | 7.5ft (2.3m) 12s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s look at what’s on the cards for the next couple of weeks.
To be straight with you, this is a tough run for Waimanalo. The whole 16-day window is filled with onshore and cross-onshore winds, mostly from the ENE, and that’s exactly the wrong direction for this spot. The swell is coming from the same direction, so it’s a messy, lumpy, blown-out scene for the vast majority of the period. The water temperature is sitting at 80°, which is pretty much dead average for this time of year, so no surprises there.
The first week, from Sunday 30 August right through to Monday 7 September, is a write-off. The wind is pumping at 18 to 31 mph, keeping the surface nasty. The swell energy is building – from moderate readings around 377 to a very strong 3807 by Monday the 7th – but with those winds, it’s just a noisy, onshore mess. The period is short, between 7 and 8 seconds, so it’s weak, junky windswell anyway. Not worth paddling out for.
There is a brief gap in the bad run. On Tuesday 8 September, the wind swings to the SSW at 9 mph, going cross-offshore. That’s the standout moment. For the Tuesday afternoon session, the swell is 8 ft from the ENE with a period of 8 seconds, and the combined energy is a strong 1016. The wind cleans it right up, and the forecast says it’s excellent for experienced surfers. That’s your window. It’s a bit solid for beginners, but for anyone with a bit of time in the water, that’s the one to aim for. The swell direction is from the ENE, but the optimum here is from the NE, so it’s not perfect, but the clean conditions make up for it.
After that, it’s back to the same story. From Wednesday 9 September through to Monday 14 September, the trades return, and it’s choppy, lumpy, and onshore again. The swell energy drops off a fair bit, down to the 200 to 500 range, and the period stays short. Nothing to get excited about.
So, to sum it up: there’s one day to circle on the calendar. Tuesday 8 September, afternoon. Everything else is a good time to do something else. If you’re a kitesurfer, the first week has plenty of wind and lumpy swell, so that might be more your scene.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 26°C on Sun morning, min 25°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Warm (max 26°C on Wed morning, min 25°C on Wed night). Winds decreasing (near gales from the ENE on Fri morning, fresh winds from the E by Fri night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 301 | 339 | 413 | 423 | 447 | 400 | 430 | 487 | 496 | 443 | 464 | 450 | 485 | 604 | 828 | 1156 | 1145 | 1101 | 746 | 727 | 691 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | cross-on | on | on | on | cross-on | on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 3:45PM0.56m | 4:44AM0.51m | 3:57PM0.51m | 5:44AM0.52m | 4:04PM0.47m | 7:03AM0.52m | 3:54PM0.43m | 9:02AM0.54m | 10:54AM0.59m | 11:56AM0.64m | |||||||||||
Low Tide | 9:33AM0.13m | 10:17PM0.05m | 10:16AM0.20m | 10:46PM0.03m | 11:06AM0.27m | 11:19PM0.02m | 12:22PM0.33m | 00:03AM0.02m | 1:10AM0.03m | 2:48AM0.04m | 4:19AM0.02m | ||||||||||
 | |  | | | | |  |  | | | | |  |  | | | |  | |  | |
 | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — |
mm | — | — | — | — | — | — | — | 1 | 1 | — | — | 1 | — | — | — | — | — | 2 | 3 | 4 | 8 |
Temp °C | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 27 |
Feels °C | 24 | 23 | 23 | 22 | 22 | 22 | 24 | 24 | 22 | 24 | 24 | 24 | 22 | 20 | 21 | 19 | 22 | 21 | 26 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | S 12 | S 11 | S 11 | S 10 | S 10 | SSW 18 | SSW 18 | S 17 | S 16 | S 16 | E 13 | E 13 | E 12 | E 15 | E 13 | SSE 11 | SSE 11 | E 13 | S 9 | SSW 8 |
| kJ | 43 | 25 | 22 | 21 | 19 | 18 | 107 | 107 | 93 | 130 | 79 | 85 | 117 | 73 | 67 | 127 | 48 | 119 | 268 | 76 | 13 |
Swell 2 Height (m) Direction Period (s) | S 12 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | S 19 | S 9 | S 12 | S 10 | E 14 | E 14 | S 15 | S 14 | S 14 | S 14 | SSE 12 | S 13 | N 11 | S 10 | NNE 10 | SSE 7 |
| kJ | 25 | 23 | 22 | 22 | 21 | 30 | 7 | 11 | 8 | 33 | 66 | 69 | 65 | 60 | 32 | 53 | 14 | 10 | 125 | 32 | 10 |
Swell 3 Height (m) Direction Period (s) | SSW 16 | S 16 | S 20 | S 21 | S 19 | SSW 14 | SW 14 | E 15 | E 14 | S 10 | ESE 9 | S 11 | S 10 | S 10 | SSE 14 | S 13 | SW 13 | S 20 | NNE 11 | SSW 18 | S 12 |
| kJ | 26 | 5 | 8 | 8 | 29 | 18 | 8 | 4 | 14 | 8 | 8 | 9 | 8 | 8 | 18 | 31 | 7 | 7 | 11 | 31 | 11 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 301 | 339 | 413 | 423 | 447 | 400 | 430 | 487 | 496 | 443 | 464 | 450 | 485 | 604 | 828 | 1156 | 1145 | 1101 | 746 | 727 | 691 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 50 | 55 | 50 | 50 | 116 | 44 | 44 | 116 | 44 | 44 | 50 | 45 | 117 | 212 | 118 | 118 | 118 | 117 | 46 | 48 | 15 |
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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