Surf Forecasts:
Kailua Beach surf forecast from 20 Aug 2026:
- Best quality surf: Friday 21 Aug, 2AM (local time) - 2.5ft (0.8m), 7s period, ENE swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 2AM (local time) - 7ft (2.2m), 7s period, ENE swell with 435 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 2AM (local time) - 2.5ft (0.8m), 7s period with ENE swell.
Best Forecast Surf Conditions for Kailua Beach this week:
The surf forecast for Kailua Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 2AM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.8m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Kailua Beach in the next 16 days are 2.2m 7s and forecast to arrive on Monday (Aug 24) 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 0.4m 18s period and expected on Wednesday (Aug 26) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 21st Aug) | 2.5ft (0.8m) 7s |
| Best Surf | 2AM (Fri 21st Aug) | 2.5ft (0.8m) 7s |
| Most Powerful | 2AM (Mon 24th Aug) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Kailua Beach over the next 16 days.
The Lowdown
Alright surfers, Rusty here. Gotta say, lookin' at the next two weeks for Kailua Beach, it's a bit of a mixed bag. We’ve got a long stretch of poor conditions to get through before the ocean finally wakes up.
First up, from Wednesday the 19th right through the end of the month, we're stuck in a pretty grim pattern. That wind is relentless, mostly out of the ENE, and it's blowing onshore or cross-onshore, just chopping everything up. The swell is tiny to moderate, nothing special, but the wind is the real killer. The water temp is sittin' at 80°, which is about average for this time of year, so no surprises there. Honestly, for the first ten days or so, you're better off takin' a nap. The combined wave energy is weak to moderate (188 to 573), but it's all messy and blown out. There's a gap here of nearly two weeks with no real surf on offer.
Now, we finally get a glimmer of hope. Come Wednesday morning, September 2nd, things start to shift. The swell picks up to 8 ft from the ENE, and the combined energy jumps to a strong 888. But the real story is the wind. By Wednesday afternoon, it turns super light and swings to a cross-offshore from the SSE. That’s clean, that’s glassy. The swell period is a modest 8 seconds, so it’s not a long-period groundswell, but the conditions are expected to be very good. This is the standout of the whole forecast, right here. The wave energy is strong (827), and Kailua Beach is a point break that can handle that direction. Be aware though, at 8 ft, that’s gettin’ into expert territory, and it’s “fairly consistent” here, so it’ll be worth the paddle. Crowds are possible, but it’s a Wednesday, so you might get lucky.
The energy drops off a bit into Thursday, September 3rd. The swell hangs around 7 ft, but the wind gets messy again, swinging cross and then cross-onshore, choppin' it up. The combined energy is still moderate (612), but the quality fades fast. The shine is off that apple by Thursday afternoon.
So, to wrap it up: suffer through the first week, maybe a little longer. Your one and only window is the afternoon of Wednesday, September 2nd. That’s the one to circle on the calendar. After that, it’s back to the waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Wed afternoon). Winds increasing (calm on Thu night, fresh winds from the ENE by Sat morning). | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Sun night. Warm (max 26°C on Sat afternoon, min 25°C on Sat afternoon). Mainly strong winds. | |||||||||||||||||||
Wed 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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 8 | E 8 | NE 7 | ENE 7 | ENE 7 | NE 7 | ENE 7 | ENE 7 | E 6 | E 6 | E 7 | E 7 | ENE 7 | ENE 7 | E 6 | E 7 | E 7 | E 8 | E 8 | ENE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 188 | 102 | 63 | 138 | 73 | 47 | 86 | 137 | 188 | 276 | 432 | 427 | 410 | 435 | 307 | 311 | 302 | 359 | 280 | 226 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | glassy | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 11:13AM0.64m | 12:09PM0.69m | 12:42PM0.74m | 9:57PM0.37m | 1:10PM0.78m | 11:42PM0.41m | 1:34PM0.81m | 00:29AM0.45m | 1:57PM0.83m | 1:09AM0.50m | ||||||||||
Low Tide | 00:51AM0.22m | 2:10AM0.23m | 3:54AM0.21m | 9:32PM0.37m | 5:06AM0.18m | 8:28PM0.36m | 5:55AM0.14m | 8:26PM0.35m | 6:35AM0.11m | 8:34PM0.32m | ||||||||||
 |  |  | |  | | | | | | | | |  |  | |  | |  | | |
 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 1 | — | — | 1 |
Temp °C | 25 | 25 | 25 | 26 | 26 | 25 | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 26 | 28 | 29 | 30 | 29 | 29 | 28 | 26 | 25 | 23 | 23 | 23 | 22 | 25 | 26 | 26 | 26 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | S 12 | E 8 | NE 7 | ENE 7 | ENE 7 | NE 7 | NNE 7 | SSW 16 | SSE 15 | SSW 16 | SSE 14 | SSE 13 | WNW 11 | SSE 13 | SSE 12 | SSE 12 | SSE 7 | SSW 12 | SSW 16 | SSW 14 |
| kJ | 11 | 102 | 63 | 138 | 73 | 47 | 41 | 50 | 42 | 25 | 41 | 35 | 12 | 34 | 29 | 14 | 5 | 15 | 25 | 21 |
Swell 2 Height (m) Direction Period (s) | SSE 9 | NE 6 | E 8 | SSW 18 | NNE 7 | E 7 | ESE 8 | ESE 8 | SSW 16 | S 12 | WNW 12 | WNW 11 | SSE 15 | SSW 14 | WNW 12 | SSW 13 | SSE 12 | SSE 12 | SSE 6 | S 18 |
| kJ | 8 | 58 | 55 | 30 | 51 | 38 | 7 | 14 | 26 | 12 | 29 | 25 | 23 | 21 | 13 | 18 | 13 | 14 | 4 | 25 |
Swell 3 Height (m) Direction Period (s) | SW 16 | S 12 | SSW 18 | S 12 | SSW 17 | SSW 17 | SSW 16 | S 13 | S 10 | WNW 14 | SSW 16 | SSW 16 | SSW 15 | WNW 11 | SSW 14 | WNW 11 | SSW 13 | SSW 16 | SSW 12 | SSW 12 |
| kJ | 11 | 11 | 31 | 10 | 27 | 29 | 25 | 14 | 2 | 20 | 24 | 24 | 22 | 12 | 19 | 12 | 16 | 25 | 14 | 14 |
Wind waves Height (m) Direction Period (s) | ENE 8 | — | — | — | — | — | ENE 7 | ENE 7 | E 6 | E 6 | E 7 | E 7 | ENE 7 | ENE 7 | E 6 | E 7 | E 7 | E 8 | E 8 | ENE 8 |
| kJ | 188 | — | — | — | — | — | 86 | 137 | 188 | 276 | 432 | 427 | 410 | 435 | 307 | 311 | 302 | 359 | 280 | 226 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 17 | 17 | 16 | 15 | 0 | 16 | 16 | 16 | 42 | 48 | 48 | 52 | 123 | 123 | 52 | 41 | 41 | 41 | 41 | 18 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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Information about the Kailua Beach Surf forecast
The above surf forecast table for Kailua Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kailua Beach can be found by selecting the local surf guide option on the grey menu. Our Kailua Beach 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 (Kailua Beach) 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 Kailua Beach 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.
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