Surf Forecasts:
Waimanalo surf forecast from 26 Aug 2026:
- Most powerful swell: Tuesday 1 Sep, 2AM (local time) - 6.5ft (2.0m), 8s period, ENE swell with 483 kJ wave energy.
Best Forecast Surf Conditions for Waimanalo this week:
The most powerful waves expected at Waimanalo in the next 16 days are 2.0m 8s and forecast to arrive on Tuesday (Sep 01) at 2AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 17s period and expected on Thursday (Aug 27) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Tue 1st Sep) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cookin’ for the next couple of weeks.
Well, I gotta be straight with you – this stretch is a tough one. We’re looking at a long, dry spell of poor conditions right through the end of August and into the first week of September. The wind is the main culprit, blowing fresh from the ENE at 19 mph, mostly onshore or cross-onshore, turning what could be a fun little run of swell into lumpy, choppy, messy surf. The water temp is sitting around 81°F, which is pretty much average for this time of year, so at least you won’t be cold while you’re gettin’ worked.
The first real glimmer of hope doesn’t show up until the 6th of September. We’ve got a shift in the weather pattern. The wind drops back to a moderate 16 mph, still cross-onshore, but the swell gets a serious injection of energy. The combined energy jumps to 996 (strong), and the period stretches out to a very long 12 seconds. That’s proper groundswell energy. The swell is 6 ft from the ENE. Now, a long period like that on a beach break like Waimanalo (Oahu) can be a bit tricky – it can make the waves break too straight and close out. But the power is there, and the wind is a little more manageable. This is the best on offer in the whole two weeks, but it’s still a far cry from perfect. Keep your expectations in check.
The 7th and 8th of September keep the energy up (combined energy in the 600-700 range) with the period dropping to a still-solid 10-11 seconds, but the wind stays cross-onshore. By the 9th of September, the wind finally goes a touch lighter, from the NE at 9 mph, with the swell building to 7 ft. That’s getting into the bigger range, and with the onshore wind, it’s gonna be a bumpy, powerful mess. This one’s for the experts only, and even then, it’s gonna be a battle.
So, the story is: there’s a lot of waiting. The first 12 days are a write-off. The 6th of September offers the best chance at some clean-ish, powerful waves, but it’s a long way off and the wind is still not ideal. There’s potential for a few fun ones if you’re patient and pick your hour, but I wouldn’t be clearing my calendar.
Rusty.
Short Range ForecastSome drizzle, heaviest during Thu afternoon. Warm (max 26°C on Tue afternoon, min 25°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Fri afternoon, min 25°C on Fri afternoon). Mainly fresh winds. | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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 7 | E 7 | E 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 264 | 217 | 178 | 160 | 176 | 131 | 155 | 130 | 134 | 142 | 225 | 226 | 240 | 295 | 270 | 320 | 320 | 290 | 257 | 483 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | cross-on | on | on | on | on | on | cross-on | cross-on | on | cross-on | on | on | on | on | on | on |
High Tide | 2:17PM0.65m | 1:04AM0.37m | 2:38PM0.65m | 1:42AM0.40m | 2:57PM0.65m | 2:22AM0.43m | 3:14PM0.63m | 3:05AM0.46m | 3:30PM0.60m | 3:52AM0.48m | 3:45PM0.56m | 4:44AM0.51m | 3:57PM0.51m | |||||||
Low Tide | 8:32PM0.20m | 7:12AM-0.01m | 8:49PM0.18m | 7:45AM-0.00m | 9:08PM0.15m | 8:18AM0.02m | 9:29PM0.12m | 8:54AM0.07m | 9:52PM0.09m | 9:33AM0.13m | 10:17PM0.05m | 10:16AM0.20m | 10:46PM0.03m | |||||||
 |  | | |  | |  | |  | | | | | | | | | | |  | |
 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:47 | — |
mm | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 25 | 22 | 21 | 22 | 23 | 23 | 23 | 23 | 23 | 22 | 21 | 22 | 22 | 22 | 23 | 22 | 22 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 14 | SSW 14 | S 18 | S 19 | S 17 | S 17 | S 16 | S 15 | S 14 | E 14 | E 13 | E 12 | E 12 | E 11 | S 12 | ENE 11 | S 11 | ENE 10 | S 10 |
| kJ | 50 | 21 | 41 | 98 | 181 | 214 | 143 | 121 | 104 | 100 | 146 | 126 | 76 | 75 | 65 | 25 | 38 | 21 | 31 | 18 |
Swell 2 Height (m) Direction Period (s) | SSW 12 | S 18 | S 18 | SSW 13 | SSW 13 | SSW 12 | NNE 8 | NNE 7 | E 16 | E 15 | S 14 | S 13 | S 13 | S 12 | S 12 | SSW 15 | S 11 | SSW 15 | SSE 10 | S 19 |
| kJ | 14 | 25 | 58 | 17 | 17 | 14 | 13 | 17 | 78 | 104 | 60 | 54 | 54 | 26 | 25 | 23 | 21 | 21 | 22 | 30 |
Swell 3 Height (m) Direction Period (s) | SSE 12 | SSW 12 | NW 9 | WNW 9 | WNW 10 | NNE 8 | SSW 12 | E 17 | NNE 6 | NW 8 | NW 8 | SW 18 | SW 17 | SSW 17 | SSW 16 | S 16 | SSW 15 | S 21 | SSW 14 | SW 14 |
| kJ | 13 | 14 | 3 | 8 | 10 | 7 | 14 | 24 | 8 | 3 | 3 | 12 | 12 | 28 | 26 | 5 | 22 | 9 | 20 | 7 |
Wind waves Height (m) Direction Period (s) | E 7 | E 7 | E 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 |
| kJ | 264 | 217 | 178 | 160 | 176 | 131 | 155 | 130 | 134 | 142 | 225 | 226 | 240 | 295 | 270 | 320 | 320 | 290 | 257 | 483 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 50 | 44 | 50 | 46 | 44 | 44 | 44 | 44 | 44 | 55 | 44 | 50 | 50 | 44 | 44 | 50 | 44 | 50 | 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.
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