
Surf Forecasts:
Waimanalo surf forecast from 21 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 8PM (local time) - 5.5ft (1.7m), 16s period, E swell with 1,433 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 1.7m 16s and forecast to arrive on Sunday (Jul 26) 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 15s period and expected on Tuesday (Jul 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sun 26th Jul) | 5.5ft (1.7m) 16s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's cookin' for Waimanalo.
Well, I gotta be straight with you – this is a tough one. The next 16 days are looking pretty grim for a decent paddle. We're starting on July 20th and there's a massive dry spell. The whole first week is a write-off. The wind is hammering straight onshore from the ENE, cranking at 18 to 25 mph, just trashing everything. The swell is small and weak, with a short, choppy period of 6 to 8 seconds, and the combined energy is up there in the hundreds (237 to 703), but it's all wind-driven junk. The wave comment keeps saying "poor surf conditions," and I'm not gonna argue with that. You'd be better off going for a kite surf if you're desperate, because it's not gonna be any fun on a log or a shortboard.
We finally get a shift around July 28th. The swell period stretches out to 13 to 16 seconds, which is proper groundswell, and the energy readings are massive – four-digit numbers (1282 to 1839). The main issue is that the wind is still onshore from the NE or ENE, though it does drop to a lighter breeze (9 to 12 mph) on the 28th and 29th. The wave comment upgrades to "marginal surf forecast or questionable tide conditions" on the 28th and 29th, but it's still not clean. The swell is 6 ft to 8 ft with that long period, which is a lot of water moving around, but it's going to be a bumpy, lumpy mess with the wind pushing it over. For a confident surfer who knows Waimanalo’s lineup, July 29th Wednesday morning might be the only real window to try and get a few. The swell is 8 ft from the ENE, period of 13 seconds, and the wind is a gentler 9 mph onshore. It's still not ideal, but it's the least ugly option in the whole forecast.
The water temp is sitting at 80°F, which is basically normal for this time of year, with an anomaly of only 0.4°F. No surprises there.
After that little blip, it goes straight back to poor on the 29th afternoon and through the rest of the run into early August. The wind stays onshore, the swell drops back to small, short-period junk. August 3rd and 4th have a long-period swell, but it's only 2 ft to 3 ft, so it's not going to do much. To be honest, this is a bleak outlook. For a spot that's "fairly consistent," this is a rough patch. The best I can say is that July 29th Wednesday morning is your one and only chance to get a session in, but keep your expectations on the floor. The rest of the time, you're better off finding something else to do.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Mon night. Warm (max 26°C on Tue afternoon, min 24°C on Tue night). Winds increasing (light winds from the ENE on Tue morning, fresh winds from the ENE by Wed night). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Fri morning. Warm (max 25°C on Thu afternoon, min 24°C on Thu afternoon). Mainly fresh winds. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | E 17 | E 16 | E 16 | E 16 |
Wave Graph | ||||||||||||||||||||
234 | 210 | 176 | 168 | 200 | 189 | 144 | 242 | 340 | 320 | 435 | 312 | 432 | 456 | 402 | 447 | 845 | 1158 | 1285 | 1397 | |
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 | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | on | on | cross-on | on | on | on |
High Tide | 6:04PM0.45m | 11:19AM0.44m | 4:59PM0.41m | 12:21PM0.51m | 12:58PM0.56m | 1:29PM0.59m | 1:57PM0.62m | 10:51PM0.28m | 2:25PM0.63m | 00:03AM0.30m | ||||||||||
Low Tide | 2:03AM0.07m | 3:19PM0.35m | 2:49AM0.05m | 3:43AM0.04m | 4:39AM0.02m | 5:29AM-0.00m | 9:26PM0.24m | 6:12AM-0.02m | 9:10PM0.23m | |||||||||||
— | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | |
7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | |
mm | — | 3 | 3 | — | 4 | — | — | 1 | 1 | — | — | 1 | — | — | 1 | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 26 | 25 | 24 | 25 | 25 | 25 | 25 | 24 | 25 | 25 | 24 | 24 | 25 | 25 | 24 | 25 | 24 |
Feels °C | 23 | 24 | 26 | 25 | 24 | 21 | 23 | 23 | 22 | 22 | 20 | 22 | 23 | 20 | 21 | 23 | 23 | 21 | 22 | 21 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 15 | S 14 | S 14 | E 13 | E 12 | E 11 | E 12 | S 12 | S 13 | SSW 18 | S 12 | SSW 17 | E 16 | E 14 | E 14 | E 17 | E 16 | E 16 | E 16 |
81 | 107 | 103 | 99 | 84 | 103 | 125 | 139 | 45 | 55 | 112 | 46 | 59 | 45 | 103 | 102 | 845 | 1158 | 1285 | 1397 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | E 12 | E 12 | E 14 | S 14 | SSE 13 | S 13 | S 13 | SSW 20 | SSW 20 | S 13 | SSW 18 | S 12 | SSW 16 | SSW 19 | E 18 | SSW 18 | S 16 | S 16 | SSW 16 |
12 | 12 | 25 | 37 | 89 | 59 | 54 | 52 | 77 | 75 | 31 | 104 | 25 | 53 | 125 | 154 | 103 | 137 | 131 | 83 | |
Swell 3 Height (m) Direction Period (s) | E 13 | SW 16 | E 15 | E 11 | S 26 | S 11 | SSW 23 | SSW 22 | NNW 10 | NNW 10 | S 11 | NNW 9 | SSW 21 | S 12 | S 11 | SSW 19 | S 11 | S 11 | SE 12 | S 12 |
3 | 11 | 17 | 22 | 53 | 20 | 107 | 91 | 10 | 9 | 20 | 7 | 44 | 25 | 23 | 115 | 9 | 35 | 5 | 3 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 7 |
234 | 210 | 176 | 168 | 200 | 189 | 144 | 242 | 340 | 320 | 435 | 312 | 432 | 456 | 402 | 447 | 425 | 438 | 368 | 289 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 46 | 15 | 15 | 44 | 44 | 44 | 44 | 45 | 50 | 51 | 44 | 50 | 116 | 44 | 44 | 116 | 44 | 44 | 50 | 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.










