
Surf Forecasts:
Waimanalo surf forecast from 18 Jul 2026:
- Most powerful swell: Saturday 18 Jul, 8PM (local time) - 6ft (1.9m), 8s period, ENE swell with 395 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 Saturday (Jul 18) 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 0.5m 16s period and expected on Monday (Jul 20) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sat 18th Jul) | 6ft (1.9m) 8s |
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 menu for the Waimanalo stretch.
Right off the bat, I gotta be straight with you—this is a rough one. The whole 16-day window is looking like a write-off for good paddle surfing. There’s a solid run of onshore ENE winds that just won’t let up, and the swell is mostly short-period, wind-affected slop from the east. The water temp is sitting at 79°F, which is about bang on average for the time of year, so no surprises there.
The first few days are a total bust. From Friday the 17th right through the rest of July, it’s all “poor surf conditions” with moderate to fresh onshore winds. The combined wave energy (174) is weak at first, and it builds through the weekend but the wind never goes clean. The swell is coming from the east and east-northeast, which is the exposure at Waimanalo, but the period is short—mostly 6 to 8 seconds—so it’s all choppy, bumpy, and messy. Anything over 5 ft on Saturday the 18th and Sunday the 19th is just gonna be blown-out, but with that short period, it’s not holding any shape. Beginners should steer clear of those 6 ft days.
The pattern doesn’t shift much through the first week. The wind stays onshore, and the swell hangs around in the 4 ft to 6 ft range with that same short period. The combined energy picks up a bit—moderate values like 220 to 360—but without clean wind, it’s just frustrating. There’s a small window on Tuesday the 22nd where the wind goes cross-onshore, but it’s still lumpy and not worth paddling out for.
Heading into the second week, things get weird. On Sunday the 26th of July, a long-period swell arrives—17 seconds, from the east, with a massive combined wave energy of 1457. That’s groundswell, with serious power. But here’s the kicker: the wind is still a fresh onshore ENE at 18-22 mph, and the swell is hitting an exposed beach break. With that kind of period, it’s going to be a close-out mess, breaking straight and fast. This one is for the tow-in crew or, more realistically, a kite surfer’s dream. The conditions are still “poor surf conditions” for paddle surfing.
Monday the 27th and Tuesday the 28th keep that long-period energy (16-15 seconds, combined energy over 1900), but the wind stays onshore. The swell height is 6 ft to 7 ft, but with that long period and onshore wind, it’s not going to be fun. Tuesday the 28th morning gets a “marginal” label, but it’s still onshore wind, so I’m not getting excited.
By Wednesday the 29th, the period drops to 12 seconds, and the energy falls to 837. Still onshore wind. The last few days of July and into August 1st are more of the same: short-period bump with onshore wind. The only standout is that long-period groundswell from the 26th to 28th, but it’s completely wasted by the wind. If you’re a kite surfer, that might be your window. For the rest of us, it’s a long, flat, windy run.
Bottom line: There’s nothing here worth paddling out for. The whole 16-day forecast is a bust. It’s a blank run, and that’s just how it goes sometimes. Forecasts can change, but right now, I’d save the wax.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue morning. Warm (max 25°C on Mon afternoon, min 24°C on Mon night). Mainly fresh winds. | |||||||||||||||||||
Fri 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | ||||||||||||||
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 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | E 12 | ENE 6 | ENE 7 |
Wave Graph | ||||||||||||||||||||
192 | 226 | 335 | 385 | 394 | 310 | 284 | 213 | 220 | 214 | 162 | 117 | 140 | 136 | 171 | 121 | 131 | 150 | 198 | 261 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | on | on | on | cross-on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 5:34PM0.63m | 5:36AM0.33m | 5:55PM0.57m | 7:07AM0.34m | 6:08PM0.51m | 9:13AM0.37m | 6:04PM0.45m | 11:19AM0.44m | 4:59PM0.41m | 12:21PM0.51m | 12:58PM0.56m | |||||||||
Low Tide | 00:18AM0.13m | 10:57AM0.11m | 00:51AM0.11m | 11:40AM0.20m | 1:25AM0.09m | 12:37PM0.29m | 2:03AM0.07m | 3:19PM0.35m | 2:49AM0.05m | 3:43AM0.04m | 4:39AM0.02m | |||||||||
— | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | |
7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — | — | — | — | 1 |
Temp °C | 26 | 25 | 25 | 25 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 25 | 25 | 23 | 22 | 21 | 23 | 23 | 23 | 24 | 23 | 24 | 25 | 23 | 24 | 23 | 23 | 23 | 22 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 14 | SSW 14 | NNE 8 | SSW 12 | SSW 12 | S 19 | NNE 8 | S 16 | S 16 | S 15 | S 14 | S 14 | E 12 | E 12 | E 11 | E 13 | E 12 | S 12 | E 11 |
49 | 41 | 36 | 14 | 30 | 15 | 27 | 45 | 47 | 81 | 107 | 103 | 97 | 68 | 67 | 58 | 117 | 141 | 41 | 61 | |
Swell 2 Height (m) Direction Period (s) | SE 7 | SW 10 | NE 9 | SSW 14 | SE 9 | S 19 | SSW 12 | S 18 | S 13 | SW 18 | E 12 | E 12 | E 11 | S 14 | SSE 13 | SSE 13 | S 13 | S 12 | SSW 20 | SSW 18 |
2 | 4 | 3 | 39 | 3 | 29 | 15 | 55 | 31 | 12 | 12 | 25 | 40 | 89 | 60 | 34 | 52 | 45 | 75 | 112 | |
Swell 3 Height (m) Direction Period (s) | W 14 | W 14 | S 9 | SE 9 | S 21 | S 6 | S 6 | S 11 | SW 18 | E 13 | SW 16 | E 15 | SW 16 | S 26 | S 11 | E 14 | SSW 22 | SSW 20 | NNW 10 | S 11 |
4 | 4 | 2 | 3 | 8 | 1 | 1 | 10 | 13 | 3 | 11 | 17 | 11 | 53 | 20 | 33 | 91 | 77 | 19 | 20 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 |
192 | 226 | 335 | 385 | 394 | 310 | 284 | 213 | 220 | 214 | 162 | 117 | 140 | 136 | 171 | 121 | 131 | 150 | 198 | 261 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 44 | 50 | 44 | 50 | 50 | 46 | 44 | 46 | 17 | 17 | 17 | 15 | 15 | 44 | 44 | 44 | 45 | 44 | 45 | 52 |
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.










