Surf Forecasts:
Waimanalo surf forecast from 31 Jul 2026:
- Most powerful swell: Saturday 1 Aug, 8AM (local time) - 8ft (2.5m), 8s period, E 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 2.5m 8s and forecast to arrive on Saturday (Aug 01) 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 13s period and expected on Thursday (Jul 30) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sat 1st Aug) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Rusty here, checking out the Waimanalo surf outlook. Gotta be honest, it's a grim picture for the next 16 days. The trade winds are blowing steady out of the ENE, and it's messing up every single session. Water temp's sitting around 80°F, which is about average for this time of year.
The forecast kicks off on Thursday, July 30th, and it's a no-go. Thursday morning you're looking at 5ft of weak, short-period ENE swell (8 seconds), with a cross-onshore wind at 16 mph. The wave energy is weak (279), and conditions are just poor. It stays ugly through Friday, July 31st, with the swell bumping up to 6ft in the morning and 7ft in the afternoon, but with a fresh breeze up to 25 mph, it's lumpy and terrible. The combined energy hits moderate 567 and then 721, but the wind ruins any chance.
Over the weekend, August 1st and 2nd, the swell pushes over 8ft – that's expert territory size-wise – but the winds stay strong at 25 mph, cross-on and onshore. Saturday morning sees wave energy at a strong 1107, but it's called strong cross-onshore and messy. Sunday is a bit lighter with winds, but still onshore at 22 mph and lumpy.
Monday, August 3rd, the swell drops to 6ft, but the wind is still onshore at 12-19 mph and the energy sits at a moderate 486. This pattern of poor surf and dirty wind carries on through the whole first week. By Tuesday, August 4th, we get a longer period swell of 12 seconds (a proper groundswell) and 5ft, but it's still onshore wind and the wave comment is "poor surf conditions." That period would work better at a point or reef, but the wind kills it.
From Wednesday, August 5th, through to Monday, August 10th, the swell stays in the 3ft to 4ft range, with cross-onshore winds and weak to moderate energy (113 to 228). It's all chop and no hope. Tuesday, August 11th, offers a slight break with a light cross-shore breeze at 6 mph and 5ft swell, but there's a risk of thunderstorms and the period is short at 7 seconds, so still no good.
The last few days, from Wednesday, August 12th to Friday, August 14th, the swell drops right off to 2ft to 4ft with weak energy. Even if it goes glassy, the swell is too small and short-period. There's not a single standout session in the whole 16-day window. The onshore wind is relentless. A kite surfer might be eyeing that 25 mph wind and 8ft swell on the weekend, but for us paddle surfers, it's a long, frustrating gap. Forecasts can shift, but right now, I'd say save your energy.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 25°C on Thu night). Winds increasing (moderate winds from the ENE on Thu afternoon, strong winds from the ENE by Fri night). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon night. Warm (max 26°C on Wed morning, min 24°C on Sun night). Winds decreasing (fresh winds from the ENE on Sun afternoon, light winds from the ENE by Tue morning). | |||||||||||||||||||
Thu 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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 8 | E 7 | E 7 | E 7 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 6 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | ENE 9 | ENE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 201 | 264 | 387 | 478 | 784 | 902 | 807 | 956 | 801 | 705 | 560 | 326 | 370 | 203 | 741 | 572 | 480 | 352 | 92 | 176 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-on | on | on | cross-on | on | on | on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | on |
High Tide | 4:07PM0.66m | 2:57AM0.35m | 4:27PM0.64m | 3:46AM0.36m | 4:44PM0.61m | 4:42AM0.37m | 4:58PM0.57m | 5:48AM0.38m | 5:09PM0.52m | 7:16AM0.41m | 5:14PM0.48m | 9:27AM0.45m | 4:57PM0.44m | |||||||
Low Tide | 10:31PM0.18m | 9:04AM-0.01m | 10:57PM0.16m | 9:37AM0.05m | 11:22PM0.13m | 10:12AM0.11m | 11:50PM0.10m | 10:52AM0.19m | 00:22AM0.07m | 11:44AM0.27m | 1:03AM0.04m | 1:35PM0.35m | 1:59AM0.02m | |||||||
 |  |  | |  | | | | | | | | |  |  |  |  | | | | |
 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — |
 | 7:09 | — | — | 7:09 | — | — | 7:08 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — |
Temp °C | 27 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 |
Feels °C | 28 | 26 | 24 | 22 | 22 | 21 | 21 | 22 | 22 | 21 | 21 | 23 | 23 | 22 | 26 | 25 | 25 | 28 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | N 6 | E 16 | E 15 | E 16 | E 15 | E 15 | E 14 | E 14 | E 14 | E 14 | E 13 | N 6 | E 13 | E 12 | ENE 12 | SSW 12 | S 13 | NNE 9 | ENE 9 | ENE 8 |
| kJ | 21 | 81 | 157 | 231 | 205 | 205 | 196 | 194 | 188 | 134 | 87 | 25 | 121 | 144 | 741 | 13 | 14 | 8 | 92 | 176 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | S 13 | N 8 | N 8 | N 8 | SSW 14 | SSW 14 | N 10 | N 9 | N 9 | N 8 | E 13 | SSE 13 | SSW 12 | SSW 12 | N 10 | N 9 | S 13 | NNE 8 | S 12 |
| kJ | 59 | 52 | 23 | 12 | 11 | 19 | 18 | 16 | 27 | 14 | 12 | 84 | 17 | 14 | 14 | 8 | 7 | 13 | 7 | 11 |
Swell 3 Height (m) Direction Period (s) | N 9 | N 9 | S 12 | S 12 | S 12 | S 11 | S 11 | SSW 14 | SSW 14 | SW 13 | S 13 | N 8 | SSW 12 | S 13 | SE 8 | SE 7 | SSW 11 | SSW 11 | S 12 | NNE 8 |
| kJ | 6 | 25 | 27 | 26 | 11 | 10 | 9 | 20 | 19 | 7 | 13 | 10 | 15 | 3 | 3 | 2 | 12 | 11 | 12 | 6 |
Wind waves Height (m) Direction Period (s) | E 8 | E 7 | E 7 | E 7 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 6 | — | ENE 11 | ENE 10 | ENE 9 | E 5 | — |
| kJ | 201 | 264 | 387 | 478 | 784 | 902 | 807 | 956 | 801 | 705 | 560 | 326 | 370 | 203 | — | 572 | 480 | 352 | 67 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 50 | 15 | 50 | 56 | 117 | 120 | 116 | 119 | 56 | 52 | 46 | 50 | 46 | 15 | 21 | 15 | 15 | 16 | 15 | 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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