Surf Forecasts:
Waimanalo surf forecast from 23 Aug 2026:
- Most powerful swell: Sunday 23 Aug, 5AM (local time) - 6ft (1.9m), 7s period, ENE swell with 362 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 7s and forecast to arrive on Sunday (Aug 23) at 5AM. 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 | 5AM (Sun 23rd Aug) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Alright folks, Rusty here, and I'm taking a look at the next couple of weeks. Got to be honest, it's a rough stretch. The wind is hammering us from the ENE, and it's just not letting up. The swell is there, but the wind is wrecking it. We're looking at a solid week of poor surf conditions, with wave energy hanging around the moderate range, like a reading of 307 (moderate wave energy) on the 23rd.
There's a real gap here. From the start of the period, right through until the 6th of September, it's a total loss. That's nearly two weeks of onshore wind and lumpy, choppy, or just plain bad surf. The water temp will feel about average for this time of year, but that's small comfort when you're getting blown off your board.
The first real chance comes on the 6th of September. Waimanalo is the only break in the game, and it finally gets a break from the wind. Sunday morning and afternoon on the 6th, we get a light cross-offshore breeze from the south. That's everything. The swell is still around 5.6 ft from the ENE, with a period of 8 seconds, and the combined energy is a moderate 302. The report says the conditions are "clean". That's the word we've been waiting for. It's a beginner-friendly spot, and it's fairly consistent, so it's the best we've got. The crowds are sometimes a thing here, so expect a few others with the same thought.
Monday the 7th looks a bit more marginal again, with a cross-onshore wind picking up. So, that window on Sunday the 6th is your one true standout. Pounce on it while you can.
Short Range ForecastMostly dry. Warm (max 26°C on Sun morning, min 25°C on Sat night). Mainly strong winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Tue night, min 25°C on Tue night). Mainly fresh winds. | ||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 | ENE 7 | ENE 6 | ENE 6 | E 6 | E 7 | E 7 | E 7 | ENE 7 | E 7 | E 6 | ENE 6 | ENE 6 | ENE 6 | E 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 400 | 307 | 320 | 312 | 307 | 293 | 302 | 345 | 352 | 240 | 188 | 160 | 160 | 130 | 130 | 117 | 130 | 182 | 286 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | cross-on | cross-on | on | on |
High Tide | 10:27PM0.27m | 1:31PM0.61m | 11:46PM0.30m | 1:55PM0.63m | 00:27AM0.33m | 2:17PM0.65m | 1:04AM0.37m | 2:38PM0.65m | 1:42AM0.40m | 2:57PM0.65m | 2:22AM0.43m | 3:14PM0.63m | 3:05AM0.46m | ||||||
Low Tide | 9:18PM0.23m | 5:19AM0.05m | 8:24PM0.22m | 6:03AM0.02m | 8:21PM0.21m | 6:39AM-0.00m | 8:32PM0.20m | 7:12AM-0.01m | 8:49PM0.18m | 7:45AM-0.00m | 9:08PM0.15m | 8:18AM0.02m | 9:29PM0.12m | ||||||
 |  |  |  | | | | | | | | | | | | | | | | |
 | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — |
 | 6:54 | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 23 | 25 | 25 | 24 | 25 | 25 | 25 | 24 | 24 | 23 | 21 | 23 | 23 | 24 | 23 | 24 | 23 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | WNW 12 | SSE 13 | ESE 10 | NW 12 | SSE 12 | SSE 12 | SSW 13 | SSW 12 | SSW 16 | SSW 14 | SSW 14 | S 18 | S 19 | S 17 | S 17 | S 16 | S 15 | S 14 | E 13 |
| kJ | 30 | 35 | 31 | 35 | 30 | 28 | 16 | 15 | 25 | 21 | 41 | 98 | 181 | 214 | 143 | 121 | 104 | 100 | 123 |
Swell 2 Height (m) Direction Period (s) | SSE 14 | WNW 11 | WNW 10 | SSE 13 | NW 11 | SSW 13 | SSE 12 | SSW 16 | SSE 12 | S 18 | S 18 | SSW 13 | SSW 13 | NNE 8 | NNE 8 | NNE 8 | NNE 7 | E 14 | S 14 |
| kJ | 41 | 12 | 11 | 34 | 18 | 35 | 14 | 25 | 13 | 25 | 58 | 17 | 17 | 14 | 22 | 19 | 16 | 100 | 60 |
Swell 3 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSE 13 | SSW 14 | SSW 14 | WNW 10 | SSE 7 | SSE 11 | SSW 12 | WNW 10 | WNW 10 | WNW 10 | NW 10 | SSW 12 | NW 10 | NW 9 | E 15 | NW 9 | NW 9 |
| kJ | 24 | 24 | 18 | 41 | 19 | 10 | 5 | 13 | 14 | 10 | 9 | 10 | 16 | 14 | 14 | 14 | 39 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | E 7 | ENE 7 | ENE 6 | ENE 6 | E 6 | E 7 | E 7 | E 7 | ENE 7 | E 7 | E 6 | ENE 6 | ENE 6 | ENE 6 | E 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 |
| kJ | 400 | 307 | 320 | 312 | 307 | 293 | 302 | 345 | 352 | 240 | 188 | 160 | 160 | 130 | 130 | 117 | 130 | 182 | 286 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 50 | 50 | 58 | 50 | 50 | 44 | 45 | 50 | 50 | 44 | 50 | 50 | 17 | 44 | 44 | 15 | 44 | 55 | 44 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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